edk2/EdkCompatibilityPkg/Foundation/Protocol/Performance/Performance.h:

[mirror_edk2.git] / MdePkg / Include / Library / BaseLib.h

/** @file
  Memory-only library functions with no library constructor/destructor

  Copyright (c) 2006 - 2007, Intel Corporation
  All rights reserved. This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef __BASE_LIB__
#define __BASE_LIB__

//
// Definitions for architecture specific types
// These include SPIN_LOCK and BASE_LIBRARY_JUMP_BUFFER
//

//
// SPIN_LOCK
//
typedef volatile UINTN              SPIN_LOCK;

#if   defined (MDE_CPU_IA32)
//
// IA32 context buffer used by SetJump() and LongJump()
//
typedef struct {
  UINT32                            Ebx;
  UINT32                            Esi;
  UINT32                            Edi;
  UINT32                            Ebp;
  UINT32                            Esp;
  UINT32                            Eip;
} BASE_LIBRARY_JUMP_BUFFER;

#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 4

#elif defined (MDE_CPU_IPF)

//
// IPF context buffer used by SetJump() and LongJump()
//
typedef struct {
  UINT64                            F2[2];
  UINT64                            F3[2];
  UINT64                            F4[2];
  UINT64                            F5[2];
  UINT64                            F16[2];
  UINT64                            F17[2];
  UINT64                            F18[2];
  UINT64                            F19[2];
  UINT64                            F20[2];
  UINT64                            F21[2];
  UINT64                            F22[2];
  UINT64                            F23[2];
  UINT64                            F24[2];
  UINT64                            F25[2];
  UINT64                            F26[2];
  UINT64                            F27[2];
  UINT64                            F28[2];
  UINT64                            F29[2];
  UINT64                            F30[2];
  UINT64                            F31[2];
  UINT64                            R4;
  UINT64                            R5;
  UINT64                            R6;
  UINT64                            R7;
  UINT64                            SP;
  UINT64                            BR0;
  UINT64                            BR1;
  UINT64                            BR2;
  UINT64                            BR3;
  UINT64                            BR4;
  UINT64                            BR5;
  UINT64                            InitialUNAT;
  UINT64                            AfterSpillUNAT;
  UINT64                            PFS;
  UINT64                            BSP;
  UINT64                            Predicates;
  UINT64                            LoopCount;
  UINT64                            FPSR;
} BASE_LIBRARY_JUMP_BUFFER;

#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 0x10

#elif defined (MDE_CPU_X64)
//
// X64 context buffer used by SetJump() and LongJump()
//
typedef struct {
  UINT64                            Rbx;
  UINT64                            Rsp;
  UINT64                            Rbp;
  UINT64                            Rdi;
  UINT64                            Rsi;
  UINT64                            R12;
  UINT64                            R13;
  UINT64                            R14;
  UINT64                            R15;
  UINT64                            Rip;
} BASE_LIBRARY_JUMP_BUFFER;

#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8

#elif defined (MDE_CPU_EBC)
//
// EBC context buffer used by SetJump() and LongJump()
//
typedef struct {
  UINT64                            R0;
  UINT64                            R1;
  UINT64                            R2;
  UINT64                            R3;
  UINT64                            IP;
} BASE_LIBRARY_JUMP_BUFFER;

#define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT 8

#else
#error Unknown Processor Type
#endif

//
// String Services
//

/**
  Copies one Null-terminated Unicode string to another Null-terminated Unicode
  string and returns the new Unicode string.

  This function copies the contents of the Unicode string Source to the Unicode
  string Destination, and returns Destination. If Source and Destination
  overlap, then the results are undefined.

  If Destination is NULL, then ASSERT().
  If Destination is not aligned on a 16-bit boundary, then ASSERT().
  If Source is NULL, then ASSERT().
  If Source is not aligned on a 16-bit boundary, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  Destination Pointer to a Null-terminated Unicode string.
  @param  Source      Pointer to a Null-terminated Unicode string.

  @return Destiantion

**/
CHAR16 *
EFIAPI
StrCpy (
  OUT     CHAR16                    *Destination,
  IN      CONST CHAR16              *Source
  );


/**
  Copies one Null-terminated Unicode string with a maximum length to another
  Null-terminated Unicode string with a maximum length and returns the new
  Unicode string.

  This function copies the contents of the Unicode string Source to the Unicode
  string Destination, and returns Destination. At most, Length Unicode
  characters are copied from Source to Destination. If Length is 0, then
  Destination is returned unmodified. If Length is greater that the number of
  Unicode characters in Source, then Destination is padded with Null Unicode
  characters. If Source and Destination overlap, then the results are
  undefined.

  If Length > 0 and Destination is NULL, then ASSERT().
  If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
  If Length > 0 and Source is NULL, then ASSERT().
  If Length > 0 and Source is not aligned on a 16-bit bounadry, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  Destination Pointer to a Null-terminated Unicode string.
  @param  Source      Pointer to a Null-terminated Unicode string.
  @param  Length      Maximum number of Unicode characters to copy.

  @return Destination

**/
CHAR16 *
EFIAPI
StrnCpy (
  OUT     CHAR16                    *Destination,
  IN      CONST CHAR16              *Source,
  IN      UINTN                     Length
  );


/**
  Returns the length of a Null-terminated Unicode string.

  This function returns the number of Unicode characters in the Null-terminated
  Unicode string specified by String.

  If String is NULL, then ASSERT().
  If String is not aligned on a 16-bit boundary, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and String contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  String  Pointer to a Null-terminated Unicode string.

  @return The length of String.

**/
UINTN
EFIAPI
StrLen (
  IN      CONST CHAR16              *String
  );


/**
  Returns the size of a Null-terminated Unicode string in bytes, including the
  Null terminator.

  This function returns the size, in bytes, of the Null-terminated Unicode
  string specified by String.

  If String is NULL, then ASSERT().
  If String is not aligned on a 16-bit boundary, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and String contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  String  Pointer to a Null-terminated Unicode string.

  @return The size of String.

**/
UINTN
EFIAPI
StrSize (
  IN      CONST CHAR16              *String
  );


/**
  Compares two Null-terminated Unicode strings, and returns the difference
  between the first mismatched Unicode characters.

  This function compares the Null-terminated Unicode string FirstString to the
  Null-terminated Unicode string SecondString. If FirstString is identical to
  SecondString, then 0 is returned. Otherwise, the value returned is the first
  mismatched Unicode character in SecondString subtracted from the first
  mismatched Unicode character in FirstString.

  If FirstString is NULL, then ASSERT().
  If FirstString is not aligned on a 16-bit boundary, then ASSERT().
  If SecondString is NULL, then ASSERT().
  If SecondString is not aligned on a 16-bit boundary, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more
  than PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more
  than PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  FirstString   Pointer to a Null-terminated Unicode string.
  @param  SecondString  Pointer to a Null-terminated Unicode string.

  @retval 0   FirstString is identical to SecondString.
  @retval !=0 FirstString is not identical to SecondString.

**/
INTN
EFIAPI
StrCmp (
  IN      CONST CHAR16              *FirstString,
  IN      CONST CHAR16              *SecondString
  );


/**
  Compares two Null-terminated Unicode strings with maximum lengths, and
  returns the difference between the first mismatched Unicode characters.

  This function compares the Null-terminated Unicode string FirstString to the
  Null-terminated Unicode string SecondString. At most, Length Unicode
  characters will be compared. If Length is 0, then 0 is returned. If
  FirstString is identical to SecondString, then 0 is returned. Otherwise, the
  value returned is the first mismatched Unicode character in SecondString
  subtracted from the first mismatched Unicode character in FirstString.

  If Length > 0 and FirstString is NULL, then ASSERT().
  If Length > 0 and FirstString is not aligned on a 16-bit bounadary, then ASSERT().
  If Length > 0 and SecondString is NULL, then ASSERT().
  If Length > 0 and SecondString is not aligned on a 16-bit bounadary, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more
  than PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more
  than PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  FirstString   Pointer to a Null-terminated Unicode string.
  @param  SecondString  Pointer to a Null-terminated Unicode string.
  @param  Length        Maximum number of Unicode characters to compare.

  @retval 0   FirstString is identical to SecondString.
  @retval !=0 FirstString is not identical to SecondString.

**/
INTN
EFIAPI
StrnCmp (
  IN      CONST CHAR16              *FirstString,
  IN      CONST CHAR16              *SecondString,
  IN      UINTN                     Length
  );


/**
  Concatenates one Null-terminated Unicode string to another Null-terminated
  Unicode string, and returns the concatenated Unicode string.

  This function concatenates two Null-terminated Unicode strings. The contents
  of Null-terminated Unicode string Source are concatenated to the end of
  Null-terminated Unicode string Destination. The Null-terminated concatenated
  Unicode String is returned. If Source and Destination overlap, then the
  results are undefined.

  If Destination is NULL, then ASSERT().
  If Destination is not aligned on a 16-bit bounadary, then ASSERT().
  If Source is NULL, then ASSERT().
  If Source is not aligned on a 16-bit bounadary, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Destination contains more
  than PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination
  and Source results in a Unicode string with more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  Destination Pointer to a Null-terminated Unicode string.
  @param  Source      Pointer to a Null-terminated Unicode string.

  @return Destination

**/
CHAR16 *
EFIAPI
StrCat (
  IN OUT  CHAR16                    *Destination,
  IN      CONST CHAR16              *Source
  );


/**
  Concatenates one Null-terminated Unicode string with a maximum length to the
  end of another Null-terminated Unicode string, and returns the concatenated
  Unicode string.

  This function concatenates two Null-terminated Unicode strings. The contents
  of Null-terminated Unicode string Source are concatenated to the end of
  Null-terminated Unicode string Destination, and Destination is returned. At
  most, Length Unicode characters are concatenated from Source to the end of
  Destination, and Destination is always Null-terminated. If Length is 0, then
  Destination is returned unmodified. If Source and Destination overlap, then
  the results are undefined.

  If Destination is NULL, then ASSERT().
  If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
  If Length > 0 and Source is NULL, then ASSERT().
  If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Destination contains more
  than PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination
  and Source results in a Unicode string with more than
  PcdMaximumUnicodeStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  Destination Pointer to a Null-terminated Unicode string.
  @param  Source      Pointer to a Null-terminated Unicode string.
  @param  Length      Maximum number of Unicode characters to concatenate from
                      Source.

  @return Destination

**/
CHAR16 *
EFIAPI
StrnCat (
  IN OUT  CHAR16                    *Destination,
  IN      CONST CHAR16              *Source,
  IN      UINTN                     Length
  );

/**
  Returns the first occurance of a Null-terminated Unicode sub-string
  in a Null-terminated Unicode string.

  This function scans the contents of the Null-terminated Unicode string
  specified by String and returns the first occurrence of SearchString.
  If SearchString is not found in String, then NULL is returned.  If
  the length of SearchString is zero, then String is
  returned.

  If String is NULL, then ASSERT().
  If String is not aligned on a 16-bit boundary, then ASSERT().
  If SearchString is NULL, then ASSERT().
  If SearchString is not aligned on a 16-bit boundary, then ASSERT().

  If PcdMaximumUnicodeStringLength is not zero, and SearchString
  or String contains more than PcdMaximumUnicodeStringLength Unicode
  characters not including the Null-terminator, then ASSERT().

  @param  String				  Pointer to a Null-terminated Unicode string.
  @param  SearchString	Pointer to a Null-terminated Unicode string to search for.

  @retval NULL            If the SearchString does not appear in String.
  @retval !NULL           If there is a match.

**/
CHAR16 *
EFIAPI
StrStr (
  IN      CONST CHAR16      	      *String,
  IN      CONST CHAR16      	      *SearchString
  );

/**
  Convert a Null-terminated Unicode decimal string to a value of
  type UINTN.

  This function returns a value of type UINTN by interpreting the contents
  of the Unicode string specified by String as a decimal number. The format
  of the input Unicode string String is:

                  [spaces] [decimal digits].

  The valid decimal digit character is in the range [0-9]. The
  function will ignore the pad space, which includes spaces or
  tab characters, before [decimal digits]. The running zero in the
  beginning of [decimal digits] will be ignored. Then, the function
  stops at the first character that is a not a valid decimal character
  or a Null-terminator, whichever one comes first.

  If String is NULL, then ASSERT().
  If String is not aligned in a 16-bit boundary, then ASSERT().
  If String has only pad spaces, then 0 is returned.
  If String has no pad spaces or valid decimal digits,
  then 0 is returned.
  If the number represented by String overflows according
  to the range defined by UINTN, then ASSERT().

  If PcdMaximumUnicodeStringLength is not zero, and String contains
  more than PcdMaximumUnicodeStringLength Unicode characters not including
  the Null-terminator, then ASSERT().

  @param  String			    Pointer to a Null-terminated Unicode string.

  @retval UINTN

**/
UINTN
EFIAPI
StrDecimalToUintn (
  IN      CONST CHAR16      	      *String
  );

/**
  Convert a Null-terminated Unicode decimal string to a value of
  type UINT64.

  This function returns a value of type UINT64 by interpreting the contents
  of the Unicode string specified by String as a decimal number. The format
  of the input Unicode string String is:

                  [spaces] [decimal digits].

  The valid decimal digit character is in the range [0-9]. The
  function will ignore the pad space, which includes spaces or
  tab characters, before [decimal digits]. The running zero in the
  beginning of [decimal digits] will be ignored. Then, the function
  stops at the first character that is a not a valid decimal character
  or a Null-terminator, whichever one comes first.

  If String is NULL, then ASSERT().
  If String is not aligned in a 16-bit boundary, then ASSERT().
  If String has only pad spaces, then 0 is returned.
  If String has no pad spaces or valid decimal digits,
  then 0 is returned.
  If the number represented by String overflows according
  to the range defined by UINT64, then ASSERT().

  If PcdMaximumUnicodeStringLength is not zero, and String contains
  more than PcdMaximumUnicodeStringLength Unicode characters not including
  the Null-terminator, then ASSERT().

  @param  String			    Pointer to a Null-terminated Unicode string.

  @retval UINT64

**/
UINT64
EFIAPI
StrDecimalToUint64 (
  IN      CONST CHAR16      	      *String
  );
 

/**
  Convert a Null-terminated Unicode hexadecimal string to a value of type UINTN.

  This function returns a value of type UINTN by interpreting the contents
  of the Unicode string specified by String as a hexadecimal number.
  The format of the input Unicode string String is:

                  [spaces][zeros][x][hexadecimal digits].

  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
  If "x" appears in the input string, it must be prefixed with at least one 0.
  The function will ignore the pad space, which includes spaces or tab characters,
  before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
  [hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
  first valid hexadecimal digit. Then, the function stops at the first character that is
  a not a valid hexadecimal character or NULL, whichever one comes first.

  If String is NULL, then ASSERT().
  If String is not aligned in a 16-bit boundary, then ASSERT().
  If String has only pad spaces, then zero is returned.
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
  then zero is returned.
  If the number represented by String overflows according to the range defined by
  UINTN, then ASSERT().

  If PcdMaximumUnicodeStringLength is not zero, and String contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator,
  then ASSERT().

  @param  String			    Pointer to a Null-terminated Unicode string.

  @retval UINTN

**/
UINTN
EFIAPI
StrHexToUintn (
  IN      CONST CHAR16      	      *String
  );


/**
  Convert a Null-terminated Unicode hexadecimal string to a value of type UINT64.

  This function returns a value of type UINT64 by interpreting the contents
  of the Unicode string specified by String as a hexadecimal number.
  The format of the input Unicode string String is

                  [spaces][zeros][x][hexadecimal digits].

  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
  If "x" appears in the input string, it must be prefixed with at least one 0.
  The function will ignore the pad space, which includes spaces or tab characters,
  before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
  [hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
  first valid hexadecimal digit. Then, the function stops at the first character that is
  a not a valid hexadecimal character or NULL, whichever one comes first.

  If String is NULL, then ASSERT().
  If String is not aligned in a 16-bit boundary, then ASSERT().
  If String has only pad spaces, then zero is returned.
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
  then zero is returned.
  If the number represented by String overflows according to the range defined by
  UINT64, then ASSERT().

  If PcdMaximumUnicodeStringLength is not zero, and String contains more than
  PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator,
  then ASSERT().

  @param  String			    Pointer to a Null-terminated Unicode string.

  @retval UINT64

**/
UINT64
EFIAPI
StrHexToUint64 (
  IN      CONST CHAR16      	      *String
  );

/**
  Convert a nibble in the low 4 bits of a byte to a Unicode hexadecimal character.

  This function converts a nibble in the low 4 bits of a byte to a Unicode hexadecimal 
  character  For example, the nibble  0x01 and 0x0A will converted to L'1' and L'A' 
  respectively.

  The upper nibble in the input byte will be masked off.

  @param Nibble     The nibble which is in the low 4 bits of the input byte.

  @retval  CHAR16   The Unicode hexadecimal character.
  
**/
CHAR16
EFIAPI
NibbleToHexChar (
  IN UINT8      Nibble
  )
;

/** 
  Convert binary buffer to a Unicode String in a specified sequence. 

  This function converts bytes in the binary Buffer Buf to a Unicode String Str. 
  Each byte will be represented by two Unicode characters. For example, byte 0xA1 will 
  be converted into two Unicode character L'A' and L'1'. In the output String, the Unicode Character 
  for the Most Significant Nibble will be put before the Unicode Character for the Least Significant
  Nibble. The output string for the buffer containing a single byte 0xA1 will be L"A1". 
  For a buffer with multiple bytes, the Unicode character produced by the first byte will be put into the 
  the last character in the output string. The one next to first byte will be put into the
  character before the last character. This rules applies to the rest of the bytes. The Unicode
  character by the last byte will be put into the first character in the output string. For example,
  the input buffer for a 64-bits unsigned integrer 0x12345678abcdef1234 will be converted to
  a Unicode string equal to L"12345678abcdef1234".

  @param String                        On input, String is pointed to the buffer allocated for the convertion.
  @param StringLen                     The Length of String buffer to hold the output String. The length must include the tailing '\0' character.
                                       The StringLen required to convert a N bytes Buffer will be a least equal to or greater 
                                       than 2*N + 1.
  @param Buffer                        The pointer to a input buffer.
  @param BufferSizeInBytes             Lenth in bytes of the input buffer.
  

  @retval  EFI_SUCCESS                 The convertion is successfull. All bytes in Buffer has been convert to the corresponding
                                       Unicode character and placed into the right place in String.
  @retval  EFI_BUFFER_TOO_SMALL        StringSizeInBytes is smaller than 2 * N + 1the number of bytes required to
                                       complete the convertion. 
**/
RETURN_STATUS
EFIAPI
BufToHexString (
  IN OUT       CHAR16               *String,
  IN OUT       UINTN                *StringLen,
  IN     CONST UINT8                *Buffer,
  IN           UINTN                BufferSizeInBytes
  )
;


/**
  Convert a Unicode string consisting of hexadecimal characters to a output byte buffer.

  This function converts a Unicode string consisting of characters in the range of Hexadecimal
  character (L'0' to L'9', L'A' to L'F' and L'a' to L'f') to a output byte buffer. The function will stop
  at the first non-hexadecimal character or the NULL character. The convertion process can be
  simply viewed as the reverse operations defined by BufToHexString. Two Unicode characters will be 
  converted into one byte. The first Unicode character represents the Most Significant Nibble and the
  second Unicode character represents the Least Significant Nibble in the output byte. 
  The first pair of Unicode characters represents the last byte in the output buffer. The second pair of Unicode 
  characters represent the  the byte preceding the last byte. This rule applies to the rest pairs of bytes. 
  The last pair represent the first byte in the output buffer. 

  For example, a Unciode String L"12345678" will be converted into a buffer wil the following bytes 
  (first byte is the byte in the lowest memory address): "0x78, 0x56, 0x34, 0x12".

  If String has N valid hexadecimal characters for conversion,  the caller must make sure Buffer is at least 
  N/2 (if N is even) or (N+1)/2 (if N if odd) bytes. 

  @param Buffer                      The output buffer allocated by the caller.
  @param BufferSizeInBytes           On input, the size in bytes of Buffer. On output, it is updated to 
                                     contain the size of the Buffer which is actually used for the converstion.
                                     For Unicode string with 2*N hexadecimal characters (not including the 
                                     tailing NULL character), N bytes of Buffer will be used for the output.
  @param String                      The input hexadecimal string.
  @param ConvertedStrLen             The number of hexadecimal characters used to produce content in output
                                     buffer Buffer.

  @retval  RETURN_BUFFER_TOO_SMALL   The input BufferSizeInBytes is too small to hold the output. BufferSizeInBytes
                                     will be updated to the size required for the converstion.
  @retval  RETURN_SUCCESS            The convertion is successful or the first Unicode character from String
                                     is hexadecimal. If ConvertedStrLen is not NULL, it is updated
                                     to the number of hexadecimal character used for the converstion.
**/
RETURN_STATUS
EFIAPI
HexStringToBuf (
  OUT          UINT8                    *Buffer,   
  IN OUT       UINTN                    *BufferSizeInBytes,
  IN     CONST CHAR16                   *String,
  OUT          UINTN                    *ConvertedStrLen  OPTIONAL
  )
;


/**
  Test if  a Unicode character is a hexadecimal digit. If true, the input
  Unicode character is converted to a byte. 

  This function tests if a Unicode character is a hexadecimal digit. If true, the input
  Unicode character is converted to a byte. For example, Unicode character
  L'A' will be converted to 0x0A. 

  If Digit is NULL, then ASSERT.

  @retval TRUE        Char is in the range of Hexadecimal number. Digit is updated
                      to the byte value of the number.
  @retval FALSE       Char is not in the range of Hexadecimal number. Digit is keep
                      intact.
  
**/
BOOLEAN
EFIAPI
IsHexDigit (
  OUT UINT8      *Digit,
  IN  CHAR16      Char
  )
;

/**
  Convert one Null-terminated Unicode string to a Null-terminated
  ASCII string and returns the ASCII string.

  This function converts the content of the Unicode string Source
  to the ASCII string Destination by copying the lower 8 bits of
  each Unicode character. It returns Destination.

  If any Unicode characters in Source contain non-zero value in
  the upper 8 bits, then ASSERT().

  If Destination is NULL, then ASSERT().
  If Source is NULL, then ASSERT().
  If Source is not aligned on a 16-bit boundary, then ASSERT().
  If Source and Destination overlap, then ASSERT().

  If PcdMaximumUnicodeStringLength is not zero, and Source contains
  more than PcdMaximumUnicodeStringLength Unicode characters not including
  the Null-terminator, then ASSERT().

  If PcdMaximumAsciiStringLength is not zero, and Source contains more
  than PcdMaximumAsciiStringLength Unicode characters not including the
  Null-terminator, then ASSERT().

  @param  Source        Pointer to a Null-terminated Unicode string.
  @param  Destination   Pointer to a Null-terminated ASCII string.

  @return Destination

**/
CHAR8 *
EFIAPI
UnicodeStrToAsciiStr (
  IN      CONST CHAR16      	      *Source,
  OUT 	  CHAR8  	                  *Destination
  );


/**
  Copies one Null-terminated ASCII string to another Null-terminated ASCII
  string and returns the new ASCII string.

  This function copies the contents of the ASCII string Source to the ASCII
  string Destination, and returns Destination. If Source and Destination
  overlap, then the results are undefined.

  If Destination is NULL, then ASSERT().
  If Source is NULL, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and Source contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  Destination Pointer to a Null-terminated ASCII string.
  @param  Source      Pointer to a Null-terminated ASCII string.

  @return Destination

**/
CHAR8 *
EFIAPI
AsciiStrCpy (
  OUT     CHAR8                     *Destination,
  IN      CONST CHAR8               *Source
  );


/**
  Copies one Null-terminated ASCII string with a maximum length to another
  Null-terminated ASCII string with a maximum length and returns the new ASCII
  string.

  This function copies the contents of the ASCII string Source to the ASCII
  string Destination, and returns Destination. At most, Length ASCII characters
  are copied from Source to Destination. If Length is 0, then Destination is
  returned unmodified. If Length is greater that the number of ASCII characters
  in Source, then Destination is padded with Null ASCII characters. If Source
  and Destination overlap, then the results are undefined.

  If Destination is NULL, then ASSERT().
  If Source is NULL, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and Source contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  Destination Pointer to a Null-terminated ASCII string.
  @param  Source      Pointer to a Null-terminated ASCII string.
  @param  Length      Maximum number of ASCII characters to copy.

  @return Destination

**/
CHAR8 *
EFIAPI
AsciiStrnCpy (
  OUT     CHAR8                     *Destination,
  IN      CONST CHAR8               *Source,
  IN      UINTN                     Length
  );


/**
  Returns the length of a Null-terminated ASCII string.

  This function returns the number of ASCII characters in the Null-terminated
  ASCII string specified by String.

  If Length > 0 and Destination is NULL, then ASSERT().
  If Length > 0 and Source is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and String contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  String  Pointer to a Null-terminated ASCII string.

  @return The length of String.

**/
UINTN
EFIAPI
AsciiStrLen (
  IN      CONST CHAR8               *String
  );


/**
  Returns the size of a Null-terminated ASCII string in bytes, including the
  Null terminator.

  This function returns the size, in bytes, of the Null-terminated ASCII string
  specified by String.

  If String is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and String contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  String  Pointer to a Null-terminated ASCII string.

  @return The size of String.

**/
UINTN
EFIAPI
AsciiStrSize (
  IN      CONST CHAR8               *String
  );


/**
  Compares two Null-terminated ASCII strings, and returns the difference
  between the first mismatched ASCII characters.

  This function compares the Null-terminated ASCII string FirstString to the
  Null-terminated ASCII string SecondString. If FirstString is identical to
  SecondString, then 0 is returned. Otherwise, the value returned is the first
  mismatched ASCII character in SecondString subtracted from the first
  mismatched ASCII character in FirstString.

  If FirstString is NULL, then ASSERT().
  If SecondString is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and SecondString contains more
  than PcdMaximumAsciiStringLength ASCII characters not including the
  Null-terminator, then ASSERT().

  @param  FirstString   Pointer to a Null-terminated ASCII string.
  @param  SecondString  Pointer to a Null-terminated ASCII string.

  @retval 0   FirstString is identical to SecondString.
  @retval !=0 FirstString is not identical to SecondString.

**/
INTN
EFIAPI
AsciiStrCmp (
  IN      CONST CHAR8               *FirstString,
  IN      CONST CHAR8               *SecondString
  );


/**
  Performs a case insensitive comparison of two Null-terminated ASCII strings,
  and returns the difference between the first mismatched ASCII characters.

  This function performs a case insensitive comparison of the Null-terminated
  ASCII string FirstString to the Null-terminated ASCII string SecondString. If
  FirstString is identical to SecondString, then 0 is returned. Otherwise, the
  value returned is the first mismatched lower case ASCII character in
  SecondString subtracted from the first mismatched lower case ASCII character
  in FirstString.

  If FirstString is NULL, then ASSERT().
  If SecondString is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and SecondString contains more
  than PcdMaximumAsciiStringLength ASCII characters not including the
  Null-terminator, then ASSERT().

  @param  FirstString   Pointer to a Null-terminated ASCII string.
  @param  SecondString  Pointer to a Null-terminated ASCII string.

  @retval 0   FirstString is identical to SecondString using case insensitive
              comparisons.
  @retval !=0 FirstString is not identical to SecondString using case
              insensitive comparisons.

**/
INTN
EFIAPI
AsciiStriCmp (
  IN      CONST CHAR8               *FirstString,
  IN      CONST CHAR8               *SecondString
  );


/**
  Compares two Null-terminated ASCII strings with maximum lengths, and returns
  the difference between the first mismatched ASCII characters.

  This function compares the Null-terminated ASCII string FirstString to the
  Null-terminated ASCII  string SecondString. At most, Length ASCII characters
  will be compared. If Length is 0, then 0 is returned. If FirstString is
  identical to SecondString, then 0 is returned. Otherwise, the value returned
  is the first mismatched ASCII character in SecondString subtracted from the
  first mismatched ASCII character in FirstString.

  If Length > 0 and FirstString is NULL, then ASSERT().
  If Length > 0 and SecondString is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and SecondString contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  FirstString   Pointer to a Null-terminated ASCII string.
  @param  SecondString  Pointer to a Null-terminated ASCII string.
  @param  Length        Maximum number of ASCII characters for compare.
  
  @retval 0   FirstString is identical to SecondString.
  @retval !=0 FirstString is not identical to SecondString.

**/
INTN
EFIAPI
AsciiStrnCmp (
  IN      CONST CHAR8               *FirstString,
  IN      CONST CHAR8               *SecondString,
  IN      UINTN                     Length
  );


/**
  Concatenates one Null-terminated ASCII string to another Null-terminated
  ASCII string, and returns the concatenated ASCII string.

  This function concatenates two Null-terminated ASCII strings. The contents of
  Null-terminated ASCII string Source are concatenated to the end of Null-
  terminated ASCII string Destination. The Null-terminated concatenated ASCII
  String is returned.

  If Destination is NULL, then ASSERT().
  If Source is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and Destination contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and Source contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero and concatenating Destination and
  Source results in a ASCII string with more than PcdMaximumAsciiStringLength
  ASCII characters, then ASSERT().

  @param  Destination Pointer to a Null-terminated ASCII string.
  @param  Source      Pointer to a Null-terminated ASCII string.

  @return Destination

**/
CHAR8 *
EFIAPI
AsciiStrCat (
  IN OUT CHAR8    *Destination,
  IN CONST CHAR8  *Source
  );


/**
  Concatenates one Null-terminated ASCII string with a maximum length to the
  end of another Null-terminated ASCII string, and returns the concatenated
  ASCII string.

  This function concatenates two Null-terminated ASCII strings. The contents
  of Null-terminated ASCII string Source are concatenated to the end of Null-
  terminated ASCII string Destination, and Destination is returned. At most,
  Length ASCII characters are concatenated from Source to the end of
  Destination, and Destination is always Null-terminated. If Length is 0, then
  Destination is returned unmodified. If Source and Destination overlap, then
  the results are undefined.

  If Length > 0 and Destination is NULL, then ASSERT().
  If Length > 0 and Source is NULL, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and Destination contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and Source contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and concatenating Destination and
  Source results in a ASCII string with more than PcdMaximumAsciiStringLength
  ASCII characters not including the Null-terminator, then ASSERT().

  @param  Destination Pointer to a Null-terminated ASCII string.
  @param  Source      Pointer to a Null-terminated ASCII string.
  @param  Length      Maximum number of ASCII characters to concatenate from
                      Source.

  @return Destination

**/
CHAR8 *
EFIAPI
AsciiStrnCat (
  IN OUT  CHAR8                     *Destination,
  IN      CONST CHAR8               *Source,
  IN      UINTN                     Length
  );


/**
  Returns the first occurance of a Null-terminated ASCII sub-string
  in a Null-terminated ASCII string.

  This function scans the contents of the ASCII string specified by String
  and returns the first occurrence of SearchString. If SearchString is not
  found in String, then NULL is returned. If the length of SearchString is zero,
  then String is returned.

  If String is NULL, then ASSERT().
  If SearchString is NULL, then ASSERT().

  If PcdMaximumAsciiStringLength is not zero, and SearchString or
  String contains more than PcdMaximumAsciiStringLength Unicode characters
  not including the Null-terminator, then ASSERT().

  @param  String				  Pointer to a Null-terminated ASCII string.
  @param  SearchString	  Pointer to a Null-terminated ASCII string to search for.

  @retval NULL            If the SearchString does not appear in String.
  @retval !NULL           If there is a match.

**/
CHAR8 *
EFIAPI
AsciiStrStr (
  IN      CONST CHAR8      	        *String,
  IN      CONST CHAR8      	        *SearchString
  );


/**
  Convert a Null-terminated ASCII decimal string to a value of type
  UINTN.

  This function returns a value of type UINTN by interpreting the contents
  of the ASCII string String as a decimal number. The format of the input
  ASCII string String is:

                    [spaces] [decimal digits].

  The valid decimal digit character is in the range [0-9]. The function will
  ignore the pad space, which includes spaces or tab characters, before the digits.
  The running zero in the beginning of [decimal digits] will be ignored. Then, the
  function stops at the first character that is a not a valid decimal character or
  Null-terminator, whichever on comes first.

  If String has only pad spaces, then 0 is returned.
  If String has no pad spaces or valid decimal digits, then 0 is returned.
  If the number represented by String overflows according to the range defined by
  UINTN, then ASSERT().
  If String is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and String contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  String			    Pointer to a Null-terminated ASCII string.

  @retval UINTN

**/
UINTN
EFIAPI
AsciiStrDecimalToUintn (
  IN      CONST CHAR8               *String
  );


/**
  Convert a Null-terminated ASCII decimal string to a value of type
  UINT64.

  This function returns a value of type UINT64 by interpreting the contents
  of the ASCII string String as a decimal number. The format of the input
  ASCII string String is:

                    [spaces] [decimal digits].

  The valid decimal digit character is in the range [0-9]. The function will
  ignore the pad space, which includes spaces or tab characters, before the digits.
  The running zero in the beginning of [decimal digits] will be ignored. Then, the
  function stops at the first character that is a not a valid decimal character or
  Null-terminator, whichever on comes first.

  If String has only pad spaces, then 0 is returned.
  If String has no pad spaces or valid decimal digits, then 0 is returned.
  If the number represented by String overflows according to the range defined by
  UINT64, then ASSERT().
  If String is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and String contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().

  @param  String			    Pointer to a Null-terminated ASCII string.

  @retval UINT64

**/
UINT64
EFIAPI
AsciiStrDecimalToUint64 (
  IN      CONST CHAR8       	      *String
  );


/**
  Convert a Null-terminated ASCII hexadecimal string to a value of type UINTN.

  This function returns a value of type UINTN by interpreting the contents of
  the ASCII string String as a hexadecimal number. The format of the input ASCII
  string String is:

                  [spaces][zeros][x][hexadecimal digits].

  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
  appears in the input string, it must be prefixed with at least one 0. The function
  will ignore the pad space, which includes spaces or tab characters, before [zeros],
  [x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
  will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
  digit. Then, the function stops at the first character that is a not a valid
  hexadecimal character or Null-terminator, whichever on comes first.

  If String has only pad spaces, then 0 is returned.
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
  0 is returned.

  If the number represented by String overflows according to the range defined by UINTN,
  then ASSERT().
  If String is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero,
  and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
  the Null-terminator, then ASSERT().

  @param  String			    Pointer to a Null-terminated ASCII string.

  @retval UINTN

**/
UINTN
EFIAPI
AsciiStrHexToUintn (
  IN      CONST CHAR8       	      *String
  );


/**
  Convert a Null-terminated ASCII hexadecimal string to a value of type UINT64.

  This function returns a value of type UINT64 by interpreting the contents of
  the ASCII string String as a hexadecimal number. The format of the input ASCII
  string String is:

                  [spaces][zeros][x][hexadecimal digits].

  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
  appears in the input string, it must be prefixed with at least one 0. The function
  will ignore the pad space, which includes spaces or tab characters, before [zeros],
  [x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
  will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
  digit. Then, the function stops at the first character that is a not a valid
  hexadecimal character or Null-terminator, whichever on comes first.

  If String has only pad spaces, then 0 is returned.
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
  0 is returned.

  If the number represented by String overflows according to the range defined by UINT64,
  then ASSERT().
  If String is NULL, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero,
  and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
  the Null-terminator, then ASSERT().

  @param  String			    Pointer to a Null-terminated ASCII string.

  @retval UINT64

**/
UINT64
EFIAPI
AsciiStrHexToUint64 (
  IN      CONST CHAR8      	        *String
  );


/**
  Convert one Null-terminated ASCII string to a Null-terminated
  Unicode string and returns the Unicode string.

  This function converts the contents of the ASCII string Source to the Unicode
  string Destination, and returns Destination.  The function terminates the
  Unicode string Destination by appending a Null-terminator character at the end.
  The caller is responsible to make sure Destination points to a buffer with size
  equal or greater than ((AsciiStrLen (Source) + 1) * sizeof (CHAR16)) in bytes.

  If Destination is NULL, then ASSERT().
  If Destination is not aligned on a 16-bit boundary, then ASSERT().
  If Source is NULL, then ASSERT().
  If Source and Destination overlap, then ASSERT().
  If PcdMaximumAsciiStringLength is not zero, and Source contains more than
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
  then ASSERT().
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
  PcdMaximumUnicodeStringLength ASCII characters not including the
  Null-terminator, then ASSERT().

  @param  Source        Pointer to a Null-terminated ASCII string.
  @param  Destination   Pointer to a Null-terminated Unicode string.

  @return Destination

**/
CHAR16 *
EFIAPI
AsciiStrToUnicodeStr (
  IN      CONST CHAR8       	      *Source,
  OUT 	  CHAR16  	                *Destination
  );


/**
  Converts an 8-bit value to an 8-bit BCD value.

  Converts the 8-bit value specified by Value to BCD. The BCD value is
  returned.

  If Value >= 100, then ASSERT().

  @param  Value The 8-bit value to convert to BCD. Range 0..99.

  @return The BCD value

**/
UINT8
EFIAPI
DecimalToBcd8 (
  IN      UINT8                     Value
  );


/**
  Converts an 8-bit BCD value to an 8-bit value.

  Converts the 8-bit BCD value specified by Value to an 8-bit value. The 8-bit
  value is returned.

  If Value >= 0xA0, then ASSERT().
  If (Value & 0x0F) >= 0x0A, then ASSERT().

  @param  Value The 8-bit BCD value to convert to an 8-bit value.

  @return The 8-bit value is returned.

**/
UINT8
EFIAPI
BcdToDecimal8 (
  IN      UINT8                     Value
  );


//
// Linked List Functions and Macros
//

/**
  Initializes the head node of a doubly linked list that is declared as a
  global variable in a module.

  Initializes the forward and backward links of a new linked list. After
  initializing a linked list with this macro, the other linked list functions
  may be used to add and remove nodes from the linked list. This macro results
  in smaller executables by initializing the linked list in the data section,
  instead if calling the InitializeListHead() function to perform the
  equivalent operation.

  @param  ListHead  The head note of a list to initiailize.

**/
#define INITIALIZE_LIST_HEAD_VARIABLE(ListHead)  {&ListHead, &ListHead}


/**
  Initializes the head node of a doubly linked list, and returns the pointer to
  the head node of the doubly linked list.

  Initializes the forward and backward links of a new linked list. After
  initializing a linked list with this function, the other linked list
  functions may be used to add and remove nodes from the linked list. It is up
  to the caller of this function to allocate the memory for ListHead.

  If ListHead is NULL, then ASSERT().

  @param  ListHead  A pointer to the head node of a new doubly linked list.

  @return ListHead

**/
LIST_ENTRY *
EFIAPI
InitializeListHead (
  IN      LIST_ENTRY                *ListHead
  );


/**
  Adds a node to the beginning of a doubly linked list, and returns the pointer
  to the head node of the doubly linked list.

  Adds the node Entry at the beginning of the doubly linked list denoted by
  ListHead, and returns ListHead.

  If ListHead is NULL, then ASSERT().
  If Entry is NULL, then ASSERT().
  If ListHead was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and prior to insertion the number
  of nodes in ListHead, including the ListHead node, is greater than or
  equal to PcdMaximumLinkedListLength, then ASSERT().

  @param  ListHead  A pointer to the head node of a doubly linked list.
  @param  Entry     A pointer to a node that is to be inserted at the beginning
                    of a doubly linked list.

  @return ListHead

**/
LIST_ENTRY *
EFIAPI
InsertHeadList (
  IN      LIST_ENTRY                *ListHead,
  IN      LIST_ENTRY                *Entry
  );


/**
  Adds a node to the end of a doubly linked list, and returns the pointer to
  the head node of the doubly linked list.

  Adds the node Entry to the end of the doubly linked list denoted by ListHead,
  and returns ListHead.

  If ListHead is NULL, then ASSERT().
  If Entry is NULL, then ASSERT().
  If ListHead was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and prior to insertion the number
  of nodes in ListHead, including the ListHead node, is greater than or
  equal to PcdMaximumLinkedListLength, then ASSERT().

  @param  ListHead  A pointer to the head node of a doubly linked list.
  @param  Entry     A pointer to a node that is to be added at the end of the
                    doubly linked list.

  @return ListHead

**/
LIST_ENTRY *
EFIAPI
InsertTailList (
  IN      LIST_ENTRY                *ListHead,
  IN      LIST_ENTRY                *Entry
  );


/**
  Retrieves the first node of a doubly linked list.

  Returns the first node of a doubly linked list. List must have been
  initialized with InitializeListHead(). If List is empty, then NULL is
  returned.

  If List is NULL, then ASSERT().
  If List was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and the number of nodes
  in List, including the List node, is greater than or equal to
  PcdMaximumLinkedListLength, then ASSERT().

  @param  List  A pointer to the head node of a doubly linked list.

  @return The first node of a doubly linked list.
  @retval NULL  The list is empty.

**/
LIST_ENTRY *
EFIAPI
GetFirstNode (
  IN      CONST LIST_ENTRY          *List
  );


/**
  Retrieves the next node of a doubly linked list.

  Returns the node of a doubly linked list that follows Node. List must have
  been initialized with InitializeListHead(). If List is empty, then List is
  returned.

  If List is NULL, then ASSERT().
  If Node is NULL, then ASSERT().
  If List was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and List contains more than
  PcdMaximumLinkedListLenth nodes, then ASSERT().
  If Node is not a node in List, then ASSERT().

  @param  List  A pointer to the head node of a doubly linked list.
  @param  Node  A pointer to a node in the doubly linked list.

  @return Pointer to the next node if one exists. Otherwise a null value which
          is actually List is returned.

**/
LIST_ENTRY *
EFIAPI
GetNextNode (
  IN      CONST LIST_ENTRY          *List,
  IN      CONST LIST_ENTRY          *Node
  );


/**
  Checks to see if a doubly linked list is empty or not.

  Checks to see if the doubly linked list is empty. If the linked list contains
  zero nodes, this function returns TRUE. Otherwise, it returns FALSE.

  If ListHead is NULL, then ASSERT().
  If ListHead was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and the number of nodes
  in List, including the List node, is greater than or equal to
  PcdMaximumLinkedListLength, then ASSERT().

  @param  ListHead  A pointer to the head node of a doubly linked list.

  @retval TRUE  The linked list is empty.
  @retval FALSE The linked list is not empty.

**/
BOOLEAN
EFIAPI
IsListEmpty (
  IN      CONST LIST_ENTRY          *ListHead
  );


/**
  Determines if a node in a doubly linked list is null.

  Returns FALSE if Node is one of the nodes in the doubly linked list specified
  by List. Otherwise, TRUE is returned. List must have been initialized with
  InitializeListHead().

  If List is NULL, then ASSERT().
  If Node is NULL, then ASSERT().
  If List was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and the number of nodes
  in List, including the List node, is greater than or equal to
  PcdMaximumLinkedListLength, then ASSERT().
  If Node is not a node in List and Node is not equal to List, then ASSERT().

  @param  List  A pointer to the head node of a doubly linked list.
  @param  Node  A pointer to a node in the doubly linked list.

  @retval TRUE  Node is one of the nodes in the doubly linked list.
  @retval FALSE Node is not one of the nodes in the doubly linked list.

**/
BOOLEAN
EFIAPI
IsNull (
  IN      CONST LIST_ENTRY          *List,
  IN      CONST LIST_ENTRY          *Node
  );


/**
  Determines if a node the last node in a doubly linked list.

  Returns TRUE if Node is the last node in the doubly linked list specified by
  List. Otherwise, FALSE is returned. List must have been initialized with
  InitializeListHead().

  If List is NULL, then ASSERT().
  If Node is NULL, then ASSERT().
  If List was not initialized with InitializeListHead(), then ASSERT().
  If PcdMaximumLinkedListLenth is not zero, and the number of nodes
  in List, including the List node, is greater than or equal to
  PcdMaximumLinkedListLength, then ASSERT().
  If Node is not a node in List, then ASSERT().

  @param  List  A pointer to the head node of a doubly linked list.
  @param  Node  A pointer to a node in the doubly linked list.

  @retval TRUE  Node is the last node in the linked list.
  @retval FALSE Node is not the last node in the linked list.

**/
BOOLEAN
EFIAPI
IsNodeAtEnd (
  IN      CONST LIST_ENTRY          *List,
  IN      CONST LIST_ENTRY          *Node
  );


/**
  Swaps the location of two nodes in a doubly linked list, and returns the
  first node after the swap.

  If FirstEntry is identical to SecondEntry, then SecondEntry is returned.
  Otherwise, the location of the FirstEntry node is swapped with the location
  of the SecondEntry node in a doubly linked list. SecondEntry must be in the
  same double linked list as FirstEntry and that double linked list must have
  been initialized with InitializeListHead(). SecondEntry is returned after the
  nodes are swapped.

  If FirstEntry is NULL, then ASSERT().
  If SecondEntry is NULL, then ASSERT().
  If SecondEntry and FirstEntry are not in the same linked list, then ASSERT().
  If PcdMaximumLinkedListLength is not zero, and the number of nodes in the
  linked list containing the FirstEntry and SecondEntry nodes, including
  the FirstEntry and SecondEntry nodes, is greater than or equal to
  PcdMaximumLinkedListLength, then ASSERT().

  @param  FirstEntry  A pointer to a node in a linked list.
  @param  SecondEntry A pointer to another node in the same linked list.

**/
LIST_ENTRY *
EFIAPI
SwapListEntries (
  IN      LIST_ENTRY                *FirstEntry,
  IN      LIST_ENTRY                *SecondEntry
  );


/**
  Removes a node from a doubly linked list, and returns the node that follows
  the removed node.

  Removes the node Entry from a doubly linked list. It is up to the caller of
  this function to release the memory used by this node if that is required. On
  exit, the node following Entry in the doubly linked list is returned. If
  Entry is the only node in the linked list, then the head node of the linked
  list is returned.

  If Entry is NULL, then ASSERT().
  If Entry is the head node of an empty list, then ASSERT().
  If PcdMaximumLinkedListLength is not zero, and the number of nodes in the
  linked list containing Entry, including the Entry node, is greater than
  or equal to PcdMaximumLinkedListLength, then ASSERT().

  @param  Entry A pointer to a node in a linked list

  @return Entry

**/
LIST_ENTRY *
EFIAPI
RemoveEntryList (
  IN      CONST LIST_ENTRY          *Entry
  );

//
// Math Services
//

/**
  Shifts a 64-bit integer left between 0 and 63 bits. The low bits are filled
  with zeros. The shifted value is returned.

  This function shifts the 64-bit value Operand to the left by Count bits. The
  low Count bits are set to zero. The shifted value is returned.

  If Count is greater than 63, then ASSERT().

  @param  Operand The 64-bit operand to shift left.
  @param  Count   The number of bits to shift left.

  @return Operand << Count

**/
UINT64
EFIAPI
LShiftU64 (
  IN      UINT64                    Operand,
  IN      UINTN                     Count
  );


/**
  Shifts a 64-bit integer right between 0 and 63 bits. This high bits are
  filled with zeros. The shifted value is returned.

  This function shifts the 64-bit value Operand to the right by Count bits. The
  high Count bits are set to zero. The shifted value is returned.

  If Count is greater than 63, then ASSERT().

  @param  Operand The 64-bit operand to shift right.
  @param  Count   The number of bits to shift right.

  @return Operand >> Count

**/
UINT64
EFIAPI
RShiftU64 (
  IN      UINT64                    Operand,
  IN      UINTN                     Count
  );


/**
  Shifts a 64-bit integer right between 0 and 63 bits. The high bits are filled
  with original integer's bit 63. The shifted value is returned.

  This function shifts the 64-bit value Operand to the right by Count bits. The
  high Count bits are set to bit 63 of Operand.  The shifted value is returned.

  If Count is greater than 63, then ASSERT().

  @param  Operand The 64-bit operand to shift right.
  @param  Count   The number of bits to shift right.

  @return Operand >> Count

**/
UINT64
EFIAPI
ARShiftU64 (
  IN      UINT64                    Operand,
  IN      UINTN                     Count
  );


/**
  Rotates a 32-bit integer left between 0 and 31 bits, filling the low bits
  with the high bits that were rotated.

  This function rotates the 32-bit value Operand to the left by Count bits. The
  low Count bits are fill with the high Count bits of Operand. The rotated
  value is returned.

  If Count is greater than 31, then ASSERT().

  @param  Operand The 32-bit operand to rotate left.
  @param  Count   The number of bits to rotate left.

  @return Operand <<< Count

**/
UINT32
EFIAPI
LRotU32 (
  IN      UINT32                    Operand,
  IN      UINTN                     Count
  );


/**
  Rotates a 32-bit integer right between 0 and 31 bits, filling the high bits
  with the low bits that were rotated.

  This function rotates the 32-bit value Operand to the right by Count bits.
  The high Count bits are fill with the low Count bits of Operand. The rotated
  value is returned.

  If Count is greater than 31, then ASSERT().

  @param  Operand The 32-bit operand to rotate right.
  @param  Count   The number of bits to rotate right.

  @return Operand >>> Count

**/
UINT32
EFIAPI
RRotU32 (
  IN      UINT32                    Operand,
  IN      UINTN                     Count
  );


/**
  Rotates a 64-bit integer left between 0 and 63 bits, filling the low bits
  with the high bits that were rotated.

  This function rotates the 64-bit value Operand to the left by Count bits. The
  low Count bits are fill with the high Count bits of Operand. The rotated
  value is returned.

  If Count is greater than 63, then ASSERT().

  @param  Operand The 64-bit operand to rotate left.
  @param  Count   The number of bits to rotate left.

  @return Operand <<< Count

**/
UINT64
EFIAPI
LRotU64 (
  IN      UINT64                    Operand,
  IN      UINTN                     Count
  );


/**
  Rotates a 64-bit integer right between 0 and 63 bits, filling the high bits
  with the high low bits that were rotated.

  This function rotates the 64-bit value Operand to the right by Count bits.
  The high Count bits are fill with the low Count bits of Operand. The rotated
  value is returned.

  If Count is greater than 63, then ASSERT().

  @param  Operand The 64-bit operand to rotate right.
  @param  Count   The number of bits to rotate right.

  @return Operand >>> Count

**/
UINT64
EFIAPI
RRotU64 (
  IN      UINT64                    Operand,
  IN      UINTN                     Count
  );


/**
  Returns the bit position of the lowest bit set in a 32-bit value.

  This function computes the bit position of the lowest bit set in the 32-bit
  value specified by Operand. If Operand is zero, then -1 is returned.
  Otherwise, a value between 0 and 31 is returned.

  @param  Operand The 32-bit operand to evaluate.

  @return Position of the lowest bit set in Operand if found.
  @retval -1 Operand is zero.

**/
INTN
EFIAPI
LowBitSet32 (
  IN      UINT32                    Operand
  );


/**
  Returns the bit position of the lowest bit set in a 64-bit value.

  This function computes the bit position of the lowest bit set in the 64-bit
  value specified by Operand. If Operand is zero, then -1 is returned.
  Otherwise, a value between 0 and 63 is returned.

  @param  Operand The 64-bit operand to evaluate.

  @return Position of the lowest bit set in Operand if found.
  @retval -1  Operand is zero.

**/
INTN
EFIAPI
LowBitSet64 (
  IN      UINT64                    Operand
  );


/**
  Returns the bit position of the highest bit set in a 32-bit value. Equivalent
  to log2(x).

  This function computes the bit position of the highest bit set in the 32-bit
  value specified by Operand. If Operand is zero, then -1 is returned.
  Otherwise, a value between 0 and 31 is returned.

  @param  Operand The 32-bit operand to evaluate.

  @return Position of the highest bit set in Operand if found.
  @retval -1  Operand is zero.

**/
INTN
EFIAPI
HighBitSet32 (
  IN      UINT32                    Operand
  );


/**
  Returns the bit position of the highest bit set in a 64-bit value. Equivalent
  to log2(x).

  This function computes the bit position of the highest bit set in the 64-bit
  value specified by Operand. If Operand is zero, then -1 is returned.
  Otherwise, a value between 0 and 63 is returned.

  @param  Operand The 64-bit operand to evaluate.

  @return Position of the highest bit set in Operand if found.
  @retval -1  Operand is zero.

**/
INTN
EFIAPI
HighBitSet64 (
  IN      UINT64                    Operand
  );


/**
  Returns the value of the highest bit set in a 32-bit value. Equivalent to
  1 << HighBitSet32(x).

  This function computes the value of the highest bit set in the 32-bit value
  specified by Operand. If Operand is zero, then zero is returned.

  @param  Operand The 32-bit operand to evaluate.

  @return 1 << HighBitSet32(Operand)
  @retval 0 Operand is zero.

**/
UINT32
EFIAPI
GetPowerOfTwo32 (
  IN      UINT32                    Operand
  );


/**
  Returns the value of the highest bit set in a 64-bit value. Equivalent to
  1 << HighBitSet64(x).

  This function computes the value of the highest bit set in the 64-bit value
  specified by Operand. If Operand is zero, then zero is returned.

  @param  Operand The 64-bit operand to evaluate.

  @return 1 << HighBitSet64(Operand)
  @retval 0 Operand is zero.

**/
UINT64
EFIAPI
GetPowerOfTwo64 (
  IN      UINT64                    Operand
  );


/**
  Switches the endianess of a 16-bit integer.

  This function swaps the bytes in a 16-bit unsigned value to switch the value
  from little endian to big endian or vice versa. The byte swapped value is
  returned.

  @param  Value Operand A 16-bit unsigned value.

  @return The byte swaped Operand.

**/
UINT16
EFIAPI
SwapBytes16 (
  IN      UINT16                    Value
  );


/**
  Switches the endianess of a 32-bit integer.

  This function swaps the bytes in a 32-bit unsigned value to switch the value
  from little endian to big endian or vice versa. The byte swapped value is
  returned.

  @param  Value Operand A 32-bit unsigned value.

  @return The byte swaped Operand.

**/
UINT32
EFIAPI
SwapBytes32 (
  IN      UINT32                    Value
  );


/**
  Switches the endianess of a 64-bit integer.

  This function swaps the bytes in a 64-bit unsigned value to switch the value
  from little endian to big endian or vice versa. The byte swapped value is
  returned.

  @param  Value Operand A 64-bit unsigned value.

  @return The byte swaped Operand.

**/
UINT64
EFIAPI
SwapBytes64 (
  IN      UINT64                    Value
  );


/**
  Multiples a 64-bit unsigned integer by a 32-bit unsigned integer and
  generates a 64-bit unsigned result.

  This function multiples the 64-bit unsigned value Multiplicand by the 32-bit
  unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
  bit unsigned result is returned.

  If the result overflows, then ASSERT().

  @param  Multiplicand  A 64-bit unsigned value.
  @param  Multiplier    A 32-bit unsigned value.

  @return Multiplicand * Multiplier

**/
UINT64
EFIAPI
MultU64x32 (
  IN      UINT64                    Multiplicand,
  IN      UINT32                    Multiplier
  );


/**
  Multiples a 64-bit unsigned integer by a 64-bit unsigned integer and
  generates a 64-bit unsigned result.

  This function multiples the 64-bit unsigned value Multiplicand by the 64-bit
  unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
  bit unsigned result is returned.

  If the result overflows, then ASSERT().

  @param  Multiplicand  A 64-bit unsigned value.
  @param  Multiplier    A 64-bit unsigned value.

  @return Multiplicand * Multiplier

**/
UINT64
EFIAPI
MultU64x64 (
  IN      UINT64                    Multiplicand,
  IN      UINT64                    Multiplier
  );


/**
  Multiples a 64-bit signed integer by a 64-bit signed integer and generates a
  64-bit signed result.

  This function multiples the 64-bit signed value Multiplicand by the 64-bit
  signed value Multiplier and generates a 64-bit signed result. This 64-bit
  signed result is returned.

  If the result overflows, then ASSERT().

  @param  Multiplicand  A 64-bit signed value.
  @param  Multiplier    A 64-bit signed value.

  @return Multiplicand * Multiplier

**/
INT64
EFIAPI
MultS64x64 (
  IN      INT64                     Multiplicand,
  IN      INT64                     Multiplier
  );


/**
  Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates
  a 64-bit unsigned result.

  This function divides the 64-bit unsigned value Dividend by the 32-bit
  unsigned value Divisor and generates a 64-bit unsigned quotient. This
  function returns the 64-bit unsigned quotient.

  If Divisor is 0, then ASSERT().

  @param  Dividend  A 64-bit unsigned value.
  @param  Divisor   A 32-bit unsigned value.

  @return Dividend / Divisor

**/
UINT64
EFIAPI
DivU64x32 (
  IN      UINT64                    Dividend,
  IN      UINT32                    Divisor
  );


/**
  Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates
  a 32-bit unsigned remainder.

  This function divides the 64-bit unsigned value Dividend by the 32-bit
  unsigned value Divisor and generates a 32-bit remainder. This function
  returns the 32-bit unsigned remainder.

  If Divisor is 0, then ASSERT().

  @param  Dividend  A 64-bit unsigned value.
  @param  Divisor   A 32-bit unsigned value.

  @return Dividend % Divisor

**/
UINT32
EFIAPI
ModU64x32 (
  IN      UINT64                    Dividend,
  IN      UINT32                    Divisor
  );


/**
  Divides a 64-bit unsigned integer by a 32-bit unsigned integer and generates
  a 64-bit unsigned result and an optional 32-bit unsigned remainder.

  This function divides the 64-bit unsigned value Dividend by the 32-bit
  unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
  is not NULL, then the 32-bit unsigned remainder is returned in Remainder.
  This function returns the 64-bit unsigned quotient.

  If Divisor is 0, then ASSERT().

  @param  Dividend  A 64-bit unsigned value.
  @param  Divisor   A 32-bit unsigned value.
  @param  Remainder A pointer to a 32-bit unsigned value. This parameter is
                    optional and may be NULL.

  @return Dividend / Divisor

**/
UINT64
EFIAPI
DivU64x32Remainder (
  IN      UINT64                    Dividend,
  IN      UINT32                    Divisor,
  OUT     UINT32                    *Remainder  OPTIONAL
  );


/**
  Divides a 64-bit unsigned integer by a 64-bit unsigned integer and generates
  a 64-bit unsigned result and an optional 64-bit unsigned remainder.

  This function divides the 64-bit unsigned value Dividend by the 64-bit
  unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
  is not NULL, then the 64-bit unsigned remainder is returned in Remainder.
  This function returns the 64-bit unsigned quotient.

  If Divisor is 0, then ASSERT().

  @param  Dividend  A 64-bit unsigned value.
  @param  Divisor   A 64-bit unsigned value.
  @param  Remainder A pointer to a 64-bit unsigned value. This parameter is
                    optional and may be NULL.

  @return Dividend / Divisor

**/
UINT64
EFIAPI
DivU64x64Remainder (
  IN      UINT64                    Dividend,
  IN      UINT64                    Divisor,
  OUT     UINT64                    *Remainder  OPTIONAL
  );


/**
  Divides a 64-bit signed integer by a 64-bit signed integer and generates a
  64-bit signed result and a optional 64-bit signed remainder.

  This function divides the 64-bit signed value Dividend by the 64-bit signed
  value Divisor and generates a 64-bit signed quotient. If Remainder is not
  NULL, then the 64-bit signed remainder is returned in Remainder. This
  function returns the 64-bit signed quotient.

  If Divisor is 0, then ASSERT().

  @param  Dividend  A 64-bit signed value.
  @param  Divisor   A 64-bit signed value.
  @param  Remainder A pointer to a 64-bit signed value. This parameter is
                    optional and may be NULL.

  @return Dividend / Divisor

**/
INT64
EFIAPI
DivS64x64Remainder (
  IN      INT64                     Dividend,
  IN      INT64                     Divisor,
  OUT     INT64                     *Remainder  OPTIONAL
  );


/**
  Reads a 16-bit value from memory that may be unaligned.

  This function returns the 16-bit value pointed to by Buffer. The function
  guarantees that the read operation does not produce an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Uint16  Pointer to a 16-bit value that may be unaligned.

  @return *Uint16

**/
UINT16
EFIAPI
ReadUnaligned16 (
  IN      CONST UINT16              *Uint16
  );


/**
  Writes a 16-bit value to memory that may be unaligned.

  This function writes the 16-bit value specified by Value to Buffer. Value is
  returned. The function guarantees that the write operation does not produce
  an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Uint16  Pointer to a 16-bit value that may be unaligned.
  @param  Value   16-bit value to write to Buffer.

  @return Value

**/
UINT16
EFIAPI
WriteUnaligned16 (
  OUT     UINT16                    *Uint16,
  IN      UINT16                    Value
  );


/**
  Reads a 24-bit value from memory that may be unaligned.

  This function returns the 24-bit value pointed to by Buffer. The function
  guarantees that the read operation does not produce an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Buffer  Pointer to a 24-bit value that may be unaligned.

  @return The value read.

**/
UINT32
EFIAPI
ReadUnaligned24 (
  IN      CONST UINT32              *Buffer
  );


/**
  Writes a 24-bit value to memory that may be unaligned.

  This function writes the 24-bit value specified by Value to Buffer. Value is
  returned. The function guarantees that the write operation does not produce
  an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Buffer  Pointer to a 24-bit value that may be unaligned.
  @param  Value   24-bit value to write to Buffer.

  @return The value written.

**/
UINT32
EFIAPI
WriteUnaligned24 (
  OUT     UINT32                    *Buffer,
  IN      UINT32                    Value
  );


/**
  Reads a 32-bit value from memory that may be unaligned.

  This function returns the 32-bit value pointed to by Buffer. The function
  guarantees that the read operation does not produce an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Uint32  Pointer to a 32-bit value that may be unaligned.

  @return *Uint32

**/
UINT32
EFIAPI
ReadUnaligned32 (
  IN      CONST UINT32              *Uint32
  );


/**
  Writes a 32-bit value to memory that may be unaligned.

  This function writes the 32-bit value specified by Value to Buffer. Value is
  returned. The function guarantees that the write operation does not produce
  an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Uint32  Pointer to a 32-bit value that may be unaligned.
  @param  Value   32-bit value to write to Buffer.

  @return Value

**/
UINT32
EFIAPI
WriteUnaligned32 (
  OUT     UINT32                    *Uint32,
  IN      UINT32                    Value
  );


/**
  Reads a 64-bit value from memory that may be unaligned.

  This function returns the 64-bit value pointed to by Buffer. The function
  guarantees that the read operation does not produce an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Uint64  Pointer to a 64-bit value that may be unaligned.

  @return *Uint64

**/
UINT64
EFIAPI
ReadUnaligned64 (
  IN      CONST UINT64              *Uint64
  );


/**
  Writes a 64-bit value to memory that may be unaligned.

  This function writes the 64-bit value specified by Value to Buffer. Value is
  returned. The function guarantees that the write operation does not produce
  an alignment fault.

  If the Buffer is NULL, then ASSERT().

  @param  Uint64  Pointer to a 64-bit value that may be unaligned.
  @param  Value   64-bit value to write to Buffer.

  @return Value

**/
UINT64
EFIAPI
WriteUnaligned64 (
  OUT     UINT64                    *Uint64,
  IN      UINT64                    Value
  );


//
// Bit Field Functions
//

/**
  Returns a bit field from an 8-bit value.

  Returns the bitfield specified by the StartBit and the EndBit from Operand.

  If 8-bit operations are not supported, then ASSERT().
  If StartBit is greater than 7, then ASSERT().
  If EndBit is greater than 7, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..7.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..7.

  @return The bit field read.

**/
UINT8
EFIAPI
BitFieldRead8 (
  IN      UINT8                     Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  );


/**
  Writes a bit field to an 8-bit value, and returns the result.

  Writes Value to the bit field specified by the StartBit and the EndBit in
  Operand. All other bits in Operand are preserved. The new 8-bit value is
  returned.

  If 8-bit operations are not supported, then ASSERT().
  If StartBit is greater than 7, then ASSERT().
  If EndBit is greater than 7, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..7.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..7.
  @param  Value     New value of the bit field.

  @return The new 8-bit value.

**/
UINT8
EFIAPI
BitFieldWrite8 (
  IN      UINT8                     Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT8                     Value
  );


/**
  Reads a bit field from an 8-bit value, performs a bitwise OR, and returns the
  result.

  Performs a bitwise inclusive OR between the bit field specified by StartBit
  and EndBit in Operand and the value specified by OrData. All other bits in
  Operand are preserved. The new 8-bit value is returned.

  If 8-bit operations are not supported, then ASSERT().
  If StartBit is greater than 7, then ASSERT().
  If EndBit is greater than 7, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..7.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..7.
  @param  OrData    The value to OR with the read value from the value

  @return The new 8-bit value.

**/
UINT8
EFIAPI
BitFieldOr8 (
  IN      UINT8                     Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT8                     OrData
  );


/**
  Reads a bit field from an 8-bit value, performs a bitwise AND, and returns
  the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData. All other bits in Operand are
  preserved. The new 8-bit value is returned.

  If 8-bit operations are not supported, then ASSERT().
  If StartBit is greater than 7, then ASSERT().
  If EndBit is greater than 7, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..7.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..7.
  @param  AndData   The value to AND with the read value from the value.

  @return The new 8-bit value.

**/
UINT8
EFIAPI
BitFieldAnd8 (
  IN      UINT8                     Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT8                     AndData
  );


/**
  Reads a bit field from an 8-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 8-bit value is returned.

  If 8-bit operations are not supported, then ASSERT().
  If StartBit is greater than 7, then ASSERT().
  If EndBit is greater than 7, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..7.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..7.
  @param  AndData   The value to AND with the read value from the value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 8-bit value.

**/
UINT8
EFIAPI
BitFieldAndThenOr8 (
  IN      UINT8                     Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT8                     AndData,
  IN      UINT8                     OrData
  );


/**
  Returns a bit field from a 16-bit value.

  Returns the bitfield specified by the StartBit and the EndBit from Operand.

  If 16-bit operations are not supported, then ASSERT().
  If StartBit is greater than 15, then ASSERT().
  If EndBit is greater than 15, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..15.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..15.

  @return The bit field read.

**/
UINT16
EFIAPI
BitFieldRead16 (
  IN      UINT16                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  );


/**
  Writes a bit field to a 16-bit value, and returns the result.

  Writes Value to the bit field specified by the StartBit and the EndBit in
  Operand. All other bits in Operand are preserved. The new 16-bit value is
  returned.

  If 16-bit operations are not supported, then ASSERT().
  If StartBit is greater than 15, then ASSERT().
  If EndBit is greater than 15, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..15.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..15.
  @param  Value     New value of the bit field.

  @return The new 16-bit value.

**/
UINT16
EFIAPI
BitFieldWrite16 (
  IN      UINT16                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT16                    Value
  );


/**
  Reads a bit field from a 16-bit value, performs a bitwise OR, and returns the
  result.

  Performs a bitwise inclusive OR between the bit field specified by StartBit
  and EndBit in Operand and the value specified by OrData. All other bits in
  Operand are preserved. The new 16-bit value is returned.

  If 16-bit operations are not supported, then ASSERT().
  If StartBit is greater than 15, then ASSERT().
  If EndBit is greater than 15, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..15.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..15.
  @param  OrData    The value to OR with the read value from the value

  @return The new 16-bit value.

**/
UINT16
EFIAPI
BitFieldOr16 (
  IN      UINT16                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT16                    OrData
  );


/**
  Reads a bit field from a 16-bit value, performs a bitwise AND, and returns
  the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData. All other bits in Operand are
  preserved. The new 16-bit value is returned.

  If 16-bit operations are not supported, then ASSERT().
  If StartBit is greater than 15, then ASSERT().
  If EndBit is greater than 15, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..15.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..15.
  @param  AndData   The value to AND with the read value from the value

  @return The new 16-bit value.

**/
UINT16
EFIAPI
BitFieldAnd16 (
  IN      UINT16                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT16                    AndData
  );


/**
  Reads a bit field from a 16-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 16-bit value is returned.

  If 16-bit operations are not supported, then ASSERT().
  If StartBit is greater than 15, then ASSERT().
  If EndBit is greater than 15, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..15.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..15.
  @param  AndData   The value to AND with the read value from the value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 16-bit value.

**/
UINT16
EFIAPI
BitFieldAndThenOr16 (
  IN      UINT16                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT16                    AndData,
  IN      UINT16                    OrData
  );


/**
  Returns a bit field from a 32-bit value.

  Returns the bitfield specified by the StartBit and the EndBit from Operand.

  If 32-bit operations are not supported, then ASSERT().
  If StartBit is greater than 31, then ASSERT().
  If EndBit is greater than 31, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.

  @return The bit field read.

**/
UINT32
EFIAPI
BitFieldRead32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  );


/**
  Writes a bit field to a 32-bit value, and returns the result.

  Writes Value to the bit field specified by the StartBit and the EndBit in
  Operand. All other bits in Operand are preserved. The new 32-bit value is
  returned.

  If 32-bit operations are not supported, then ASSERT().
  If StartBit is greater than 31, then ASSERT().
  If EndBit is greater than 31, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.
  @param  Value     New value of the bit field.

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldWrite32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    Value
  );


/**
  Reads a bit field from a 32-bit value, performs a bitwise OR, and returns the
  result.

  Performs a bitwise inclusive OR between the bit field specified by StartBit
  and EndBit in Operand and the value specified by OrData. All other bits in
  Operand are preserved. The new 32-bit value is returned.

  If 32-bit operations are not supported, then ASSERT().
  If StartBit is greater than 31, then ASSERT().
  If EndBit is greater than 31, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.
  @param  OrData    The value to OR with the read value from the value

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldOr32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    OrData
  );


/**
  Reads a bit field from a 32-bit value, performs a bitwise AND, and returns
  the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData. All other bits in Operand are
  preserved. The new 32-bit value is returned.

  If 32-bit operations are not supported, then ASSERT().
  If StartBit is greater than 31, then ASSERT().
  If EndBit is greater than 31, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.
  @param  AndData   The value to AND with the read value from the value

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldAnd32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    AndData
  );


/**
  Reads a bit field from a 32-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 32-bit value is returned.

  If 32-bit operations are not supported, then ASSERT().
  If StartBit is greater than 31, then ASSERT().
  If EndBit is greater than 31, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..31.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..31.
  @param  AndData   The value to AND with the read value from the value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 32-bit value.

**/
UINT32
EFIAPI
BitFieldAndThenOr32 (
  IN      UINT32                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT32                    AndData,
  IN      UINT32                    OrData
  );


/**
  Returns a bit field from a 64-bit value.

  Returns the bitfield specified by the StartBit and the EndBit from Operand.

  If 64-bit operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.

  @return The bit field read.

**/
UINT64
EFIAPI
BitFieldRead64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit
  );


/**
  Writes a bit field to a 64-bit value, and returns the result.

  Writes Value to the bit field specified by the StartBit and the EndBit in
  Operand. All other bits in Operand are preserved. The new 64-bit value is
  returned.

  If 64-bit operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.
  @param  Value     New value of the bit field.

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldWrite64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    Value
  );


/**
  Reads a bit field from a 64-bit value, performs a bitwise OR, and returns the
  result.

  Performs a bitwise inclusive OR between the bit field specified by StartBit
  and EndBit in Operand and the value specified by OrData. All other bits in
  Operand are preserved. The new 64-bit value is returned.

  If 64-bit operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.
  @param  OrData    The value to OR with the read value from the value

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldOr64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    OrData
  );


/**
  Reads a bit field from a 64-bit value, performs a bitwise AND, and returns
  the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData. All other bits in Operand are
  preserved. The new 64-bit value is returned.

  If 64-bit operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.
  @param  AndData   The value to AND with the read value from the value

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldAnd64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    AndData
  );


/**
  Reads a bit field from a 64-bit value, performs a bitwise AND followed by a
  bitwise OR, and returns the result.

  Performs a bitwise AND between the bit field specified by StartBit and EndBit
  in Operand and the value specified by AndData, followed by a bitwise
  inclusive OR with value specified by OrData. All other bits in Operand are
  preserved. The new 64-bit value is returned.

  If 64-bit operations are not supported, then ASSERT().
  If StartBit is greater than 63, then ASSERT().
  If EndBit is greater than 63, then ASSERT().
  If EndBit is less than StartBit, then ASSERT().

  @param  Operand   Operand on which to perform the bitfield operation.
  @param  StartBit  The ordinal of the least significant bit in the bit field.
                    Range 0..63.
  @param  EndBit    The ordinal of the most significant bit in the bit field.
                    Range 0..63.
  @param  AndData   The value to AND with the read value from the value.
  @param  OrData    The value to OR with the result of the AND operation.

  @return The new 64-bit value.

**/
UINT64
EFIAPI
BitFieldAndThenOr64 (
  IN      UINT64                    Operand,
  IN      UINTN                     StartBit,
  IN      UINTN                     EndBit,
  IN      UINT64                    AndData,
  IN      UINT64                    OrData
  );


//
// Base Library Synchronization Functions
//

/**
  Retrieves the architecture specific spin lock alignment requirements for
  optimal spin lock performance.

  This function retrieves the spin lock alignment requirements for optimal
  performance on a given CPU architecture. The spin lock alignment must be a
  power of two and is returned by this function. If there are no alignment
  requirements, then 1 must be returned. The spin lock synchronization
  functions must function correctly if the spin lock size and alignment values
  returned by this function are not used at all. These values are hints to the
  consumers of the spin lock synchronization functions to obtain optimal spin
  lock performance.

  @return The architecture specific spin lock alignment.

**/
UINTN
EFIAPI
GetSpinLockProperties (
  VOID
  );


/**
  Initializes a spin lock to the released state and returns the spin lock.

  This function initializes the spin lock specified by SpinLock to the released
  state, and returns SpinLock. Optimal performance can be achieved by calling
  GetSpinLockProperties() to determine the size and alignment requirements for
  SpinLock.

  If SpinLock is NULL, then ASSERT().

  @param  SpinLock  A pointer to the spin lock to initialize to the released
                    state.

  @return SpinLock

**/
SPIN_LOCK *
EFIAPI
InitializeSpinLock (
  IN      SPIN_LOCK                 *SpinLock
  );


/**
  Waits until a spin lock can be placed in the acquired state.

  This function checks the state of the spin lock specified by SpinLock. If
  SpinLock is in the released state, then this function places SpinLock in the
  acquired state and returns SpinLock. Otherwise, this function waits
  indefinitely for the spin lock to be released, and then places it in the
  acquired state and returns SpinLock. All state transitions of SpinLock must
  be performed using MP safe mechanisms.

  If SpinLock is NULL, then ASSERT().
  If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().
  If PcdSpinLockTimeout is not zero, and SpinLock is can not be acquired in
  PcdSpinLockTimeout microseconds, then ASSERT().

  @param  SpinLock  A pointer to the spin lock to place in the acquired state.

  @return SpinLock

**/
SPIN_LOCK *
EFIAPI
AcquireSpinLock (
  IN      SPIN_LOCK                 *SpinLock
  );


/**
  Attempts to place a spin lock in the acquired state.

  This function checks the state of the spin lock specified by SpinLock. If
  SpinLock is in the released state, then this function places SpinLock in the
  acquired state and returns TRUE. Otherwise, FALSE is returned. All state
  transitions of SpinLock must be performed using MP safe mechanisms.

  If SpinLock is NULL, then ASSERT().
  If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().

  @param  SpinLock  A pointer to the spin lock to place in the acquired state.

  @retval TRUE  SpinLock was placed in the acquired state.
  @retval FALSE SpinLock could not be acquired.

**/
BOOLEAN
EFIAPI
AcquireSpinLockOrFail (
  IN      SPIN_LOCK                 *SpinLock
  );


/**
  Releases a spin lock.

  This function places the spin lock specified by SpinLock in the release state
  and returns SpinLock.

  If SpinLock is NULL, then ASSERT().
  If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().

  @param  SpinLock  A pointer to the spin lock to release.

  @return SpinLock

**/
SPIN_LOCK *
EFIAPI
ReleaseSpinLock (
  IN      SPIN_LOCK                 *SpinLock
  );


/**
  Performs an atomic increment of an 32-bit unsigned integer.

  Performs an atomic increment of the 32-bit unsigned integer specified by
  Value and returns the incremented value. The increment operation must be
  performed using MP safe mechanisms. The state of the return value is not
  guaranteed to be MP safe.

  If Value is NULL, then ASSERT().

  @param  Value A pointer to the 32-bit value to increment.

  @return The incremented value.

**/
UINT32
EFIAPI
InterlockedIncrement (
  IN      UINT32                    *Value
  );


/**
  Performs an atomic decrement of an 32-bit unsigned integer.

  Performs an atomic decrement of the 32-bit unsigned integer specified by
  Value and returns the decremented value. The decrement operation must be
  performed using MP safe mechanisms. The state of the return value is not
  guaranteed to be MP safe.

  If Value is NULL, then ASSERT().

  @param  Value A pointer to the 32-bit value to decrement.

  @return The decremented value.

**/
UINT32
EFIAPI
InterlockedDecrement (
  IN      UINT32                    *Value
  );


/**
  Performs an atomic compare exchange operation on a 32-bit unsigned integer.

  Performs an atomic compare exchange operation on the 32-bit unsigned integer
  specified by Value.  If Value is equal to CompareValue, then Value is set to
  ExchangeValue and CompareValue is returned.  If Value is not equal to CompareValue,
  then Value is returned.  The compare exchange operation must be performed using
  MP safe mechanisms.

  If Value is NULL, then ASSERT().

  @param  Value         A pointer to the 32-bit value for the compare exchange
                        operation.
  @param  CompareValue  32-bit value used in compare operation.
  @param  ExchangeValue 32-bit value used in exchange operation.

  @return The original *Value before exchange.

**/
UINT32
EFIAPI
InterlockedCompareExchange32 (
  IN OUT  UINT32                    *Value,
  IN      UINT32                    CompareValue,
  IN      UINT32                    ExchangeValue
  );


/**
  Performs an atomic compare exchange operation on a 64-bit unsigned integer.

  Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and
  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.
  The compare exchange operation must be performed using MP safe mechanisms.

  If Value is NULL, then ASSERT().

  @param  Value         A pointer to the 64-bit value for the compare exchange
                        operation.
  @param  CompareValue  64-bit value used in compare operation.
  @param  ExchangeValue 64-bit value used in exchange operation.

  @return The original *Value before exchange.

**/
UINT64
EFIAPI
InterlockedCompareExchange64 (
  IN OUT  UINT64                    *Value,
  IN      UINT64                    CompareValue,
  IN      UINT64                    ExchangeValue
  );


/**
  Performs an atomic compare exchange operation on a pointer value.

  Performs an atomic compare exchange operation on the pointer value specified
  by Value. If Value is equal to CompareValue, then Value is set to
  ExchangeValue and CompareValue is returned. If Value is not equal to
  CompareValue, then Value is returned. The compare exchange operation must be
  performed using MP safe mechanisms.

  If Value is NULL, then ASSERT().

  @param  Value         A pointer to the pointer value for the compare exchange
                        operation.
  @param  CompareValue  Pointer value used in compare operation.
  @param  ExchangeValue Pointer value used in exchange operation.

**/
VOID *
EFIAPI
InterlockedCompareExchangePointer (
  IN OUT  VOID                      **Value,
  IN      VOID                      *CompareValue,
  IN      VOID                      *ExchangeValue
  );


//
// Base Library Checksum Functions
//

/**
  Calculate the sum of all elements in a buffer in unit of UINT8.
  During calculation, the carry bits are dropped.

  This function calculates the sum of all elements in a buffer
  in unit of UINT8. The carry bits in result of addition are dropped.
  The result is returned as UINT8. If Length is Zero, then Zero is
  returned.

  If Buffer is NULL, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the sum operation.
  @param  Length	    The size, in bytes, of Buffer .

  @return Sum         The sum of Buffer with carry bits dropped during additions.

**/
UINT8
EFIAPI
CalculateSum8 (
  IN      CONST UINT8     	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the two's complement checksum of all elements in a buffer
  of 8-bit values.

  This function first calculates the sum of the 8-bit values in the
  buffer specified by Buffer and Length.  The carry bits in the result
  of addition are dropped. Then, the two's complement of the sum is
  returned.  If Length is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().


  @param  Buffer			Pointer to the buffer to carry out the checksum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Checksum	  The 2's complement checksum of Buffer.

**/
UINT8
EFIAPI
CalculateCheckSum8 (
  IN      CONST UINT8     	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the sum of all elements in a buffer of 16-bit values.  During
  calculation, the carry bits are dropped.

  This function calculates the sum of the 16-bit values in the buffer
  specified by Buffer and Length. The carry bits in result of addition are dropped.
  The 16-bit result is returned.  If Length is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 16-bit boundary, then ASSERT().
  If Length is not aligned on a 16-bit boundary, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the sum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Sum         The sum of Buffer with carry bits dropped during additions.

**/
UINT16
EFIAPI
CalculateSum16 (
  IN      CONST UINT16    	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the two's complement checksum of all elements in a buffer of
  16-bit values.

  This function first calculates the sum of the 16-bit values in the buffer
  specified by Buffer and Length.  The carry bits in the result of addition
  are dropped. Then, the two's complement of the sum is returned.  If Length
  is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 16-bit boundary, then ASSERT().
  If Length is not aligned on a 16-bit boundary, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the checksum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Checksum	  The 2's complement checksum of Buffer.

**/
UINT16
EFIAPI
CalculateCheckSum16 (
  IN      CONST UINT16    	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the sum of all elements in a buffer of 32-bit values.  During
  calculation, the carry bits are dropped.

  This function calculates the sum of the 32-bit values in the buffer
  specified by Buffer and Length. The carry bits in result of addition are dropped.
  The 32-bit result is returned.  If Length is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 32-bit boundary, then ASSERT().
  If Length is not aligned on a 32-bit boundary, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the sum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Sum         The sum of Buffer with carry bits dropped during additions.

**/
UINT32
EFIAPI
CalculateSum32 (
  IN      CONST UINT32    	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the two's complement checksum of all elements in a buffer of
  32-bit values.

  This function first calculates the sum of the 32-bit values in the buffer
  specified by Buffer and Length.  The carry bits in the result of addition
  are dropped. Then, the two's complement of the sum is returned.  If Length
  is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 32-bit boundary, then ASSERT().
  If Length is not aligned on a 32-bit boundary, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the checksum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Checksum	  The 2's complement checksum of Buffer.

**/
UINT32
EFIAPI
CalculateCheckSum32 (
  IN      CONST UINT32    	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the sum of all elements in a buffer of 64-bit values.  During
  calculation, the carry bits are dropped.

  This function calculates the sum of the 64-bit values in the buffer
  specified by Buffer and Length. The carry bits in result of addition are dropped.
  The 64-bit result is returned.  If Length is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 64-bit boundary, then ASSERT().
  If Length is not aligned on a 64-bit boundary, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the sum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Sum         The sum of Buffer with carry bits dropped during additions.

**/
UINT64
EFIAPI
CalculateSum64 (
  IN      CONST UINT64    	        *Buffer,
  IN      UINTN		  	              Length
  );


/**
  Returns the two's complement checksum of all elements in a buffer of
  64-bit values.

  This function first calculates the sum of the 64-bit values in the buffer
  specified by Buffer and Length.  The carry bits in the result of addition
  are dropped. Then, the two's complement of the sum is returned.  If Length
  is 0, then 0 is returned.

  If Buffer is NULL, then ASSERT().
  If Buffer is not aligned on a 64-bit boundary, then ASSERT().
  If Length is not aligned on a 64-bit boundary, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param  Buffer			Pointer to the buffer to carry out the checksum operation.
  @param  Length	    The size, in bytes, of Buffer.

  @return Checksum	  The 2's complement checksum of Buffer.

**/
UINT64
EFIAPI
CalculateCheckSum64 (
  IN      CONST UINT64    	        *Buffer,
  IN      UINTN		  	              Length
  );


//
// Base Library CPU Functions
//
typedef
VOID
(EFIAPI *SWITCH_STACK_ENTRY_POINT) (
  IN      VOID                      *Context1,  OPTIONAL
  IN      VOID                      *Context2   OPTIONAL
  );


/**
  Used to serialize load and store operations.

  All loads and stores that proceed calls to this function are guaranteed to be
  globally visible when this function returns.

**/
VOID
EFIAPI
MemoryFence (
  VOID
  );


/**
  Saves the current CPU context that can be restored with a call to LongJump()
  and returns 0.

  Saves the current CPU context in the buffer specified by JumpBuffer and
  returns 0. The initial call to SetJump() must always return 0. Subsequent
  calls to LongJump() cause a non-zero value to be returned by SetJump().

  If JumpBuffer is NULL, then ASSERT().
  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().

  @param  JumpBuffer  A pointer to CPU context buffer.

  @retval 0 Indicates a return from SetJump().

**/
UINTN
EFIAPI
SetJump (
  OUT     BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer
  );


/**
  Restores the CPU context that was saved with SetJump().

  Restores the CPU context from the buffer specified by JumpBuffer. This
  function never returns to the caller. Instead is resumes execution based on
  the state of JumpBuffer.

  If JumpBuffer is NULL, then ASSERT().
  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
  If Value is 0, then ASSERT().

  @param  JumpBuffer  A pointer to CPU context buffer.
  @param  Value       The value to return when the SetJump() context is
                      restored and must be non-zero.

**/
VOID
EFIAPI
LongJump (
  IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer,
  IN      UINTN                     Value
  );


/**
  Enables CPU interrupts.

  Enables CPU interrupts.

**/
VOID
EFIAPI
EnableInterrupts (
  VOID
  );


/**
  Disables CPU interrupts.

  Disables CPU interrupts.

**/
VOID
EFIAPI
DisableInterrupts (
  VOID
  );


/**
  Disables CPU interrupts and returns the interrupt state prior to the disable
  operation.

  Disables CPU interrupts and returns the interrupt state prior to the disable
  operation.

  @retval TRUE  CPU interrupts were enabled on entry to this call.
  @retval FALSE CPU interrupts were disabled on entry to this call.

**/
BOOLEAN
EFIAPI
SaveAndDisableInterrupts (
  VOID
  );


/**
  Enables CPU interrupts for the smallest window required to capture any
  pending interrupts.

  Enables CPU interrupts for the smallest window required to capture any
  pending interrupts.

**/
VOID
EFIAPI
EnableDisableInterrupts (
  VOID
  );


/**
  Retrieves the current CPU interrupt state.

  Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
  currently enabled. Otherwise returns FALSE.

  @retval TRUE  CPU interrupts are enabled.
  @retval FALSE CPU interrupts are disabled.

**/
BOOLEAN
EFIAPI
GetInterruptState (
  VOID
  );


/**
  Set the current CPU interrupt state.

  Sets the current CPU interrupt state to the state specified by
  InterruptState. If InterruptState is TRUE, then interrupts are enabled. If
  InterruptState is FALSE, then interrupts are disabled. InterruptState is
  returned.

  @param  InterruptState  TRUE if interrupts should enabled. FALSE if
                          interrupts should be disabled.

  @return InterruptState

**/
BOOLEAN
EFIAPI
SetInterruptState (
  IN      BOOLEAN                   InterruptState
  );


/**
  Requests CPU to pause for a short period of time.

  Requests CPU to pause for a short period of time. Typically used in MP
  systems to prevent memory starvation while waiting for a spin lock.

**/
VOID
EFIAPI
CpuPause (
  VOID
  );


/**
  Transfers control to a function starting with a new stack.

  Transfers control to the function specified by EntryPoint using the
  new stack specified by NewStack and passing in the parameters specified
  by Context1 and Context2.  Context1 and Context2 are optional and may
  be NULL.  The function EntryPoint must never return.  This function
  supports a variable number of arguments following the NewStack parameter.
  These additional arguments are ignored on IA-32, x64, and EBC.
  IPF CPUs expect one additional parameter of type VOID * that specifies
  the new backing store pointer.

  If EntryPoint is NULL, then ASSERT().
  If NewStack is NULL, then ASSERT().

  @param  EntryPoint  A pointer to function to call with the new stack.
  @param  Context1    A pointer to the context to pass into the EntryPoint
                      function.
  @param  Context2    A pointer to the context to pass into the EntryPoint
                      function.
  @param  NewStack    A pointer to the new stack to use for the EntryPoint
                      function.

**/
VOID
EFIAPI
SwitchStack (
  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  IN      VOID                      *Context1,  OPTIONAL
  IN      VOID                      *Context2,  OPTIONAL
  IN      VOID                      *NewStack,
  ...
  );


/**
  Generates a breakpoint on the CPU.

  Generates a breakpoint on the CPU. The breakpoint must be implemented such
  that code can resume normal execution after the breakpoint.

**/
VOID
EFIAPI
CpuBreakpoint (
  VOID
  );


/**
  Executes an infinite loop.

  Forces the CPU to execute an infinite loop. A debugger may be used to skip
  past the loop and the code that follows the loop must execute properly. This
  implies that the infinite loop must not cause the code that follow it to be
  optimized away.

**/
VOID
EFIAPI
CpuDeadLoop (
  VOID
  );


#if defined (MDE_CPU_IPF)

/**
  Flush a range of  cache lines in the cache coherency domain of the calling
  CPU.

  Invalidates the  cache lines specified by Address and Length. If Address is
  not aligned on a cache line boundary, then entire cache line containing
  Address is invalidated. If Address + Length is not aligned on a cache line
  boundary, then the entire instruction cache line containing Address + Length
  -1 is invalidated. This function may choose to invalidate the entire
  instruction cache if that is more efficient than invalidating the specified
  range. If Length is 0, the no instruction cache lines are invalidated.
  Address is returned.

  If Length is greater than (MAX_ADDRESS - Address + 1), then ASSERT().

  @param  Address The base address of the instruction lines to invalidate. If
                  the CPU is in a physical addressing mode, then Address is a
                  physical address. If the CPU is in a virtual addressing mode,
                  then Address is a virtual address.

  @param  Length  The number of bytes to invalidate from the instruction cache.

  @return Address

**/
VOID *
EFIAPI
IpfFlushCacheRange (
  IN      VOID                      *Address,
  IN      UINTN                     Length
  );


/**
  Executes a FC instruction
  Executes a FC instruction on the cache line specified by Address.
  The cache line size affected is at least 32-bytes (aligned on a 32-byte boundary).
  An implementation may flush a larger region.  This function is only available on IPF.

  @param Address  	The Address of cache line to be flushed.

  @return The address of FC instruction executed.

**/
UINT64
EFIAPI
AsmFc (
  IN  UINT64  Address
  );


/**
  Executes a FC.I instruction.
  Executes a FC.I instruction on the cache line specified by Address.
  The cache line size affected is at least 32-bytes (aligned on a 32-byte boundary).
  An implementation may flush a larger region.  This function is only available on IPF.

  @param Address  	The Address of cache line to be flushed.

  @return The address of FC.I instruction executed.

**/
UINT64
EFIAPI
AsmFci (
  IN  UINT64  Address
  );


/**
  Reads the current value of a Processor Identifier Register (CPUID).
  The Index of largest implemented CPUID (One less than the number of implemented CPUID
  registers) is determined by CPUID [3] bits {7:0}.
  No parameter checking is performed on Index.  If the Index value is beyond the
  implemented CPUID register range, a Reserved Register/Field fault may occur.  The caller
  must either guarantee that Index is valid, or the caller must set up fault handlers to
  catch the faults.  This function is only available on IPF.

  @param Index		The 8-bit Processor Identifier Register index to read.

  @return The current value of Processor Identifier Register specified by Index.

**/
UINT64
EFIAPI
AsmReadCpuid (
  IN  UINT8   Index
  );


/**
  Reads the current value of 64-bit Processor Status Register (PSR).
  This function is only available on IPF.

  @return The current value of PSR.

**/
UINT64
EFIAPI
AsmReadPsr (
  VOID
  );


/**
  Writes the current value of 64-bit Processor Status Register (PSR).
  No parameter checking is performed on Value.  All bits of Value corresponding to
  reserved fields of PSR must be 0 or a Reserved Register/Field fault may occur.  The caller must either guarantee that Value is valid, or the caller must set up fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to PSR.

  @return The 64-bit value written to the PSR.

**/
UINT64
EFIAPI
AsmWritePsr (
  IN UINT64  Value
  );


/**
  Reads the current value of 64-bit Kernel Register #0 (KR0).
  This function is only available on IPF.

  @return The current value of KR0.

**/
UINT64
EFIAPI
AsmReadKr0 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #1 (KR1).
  This function is only available on IPF.

  @return The current value of KR1.

**/
UINT64
EFIAPI
AsmReadKr1 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #2 (KR2).
  This function is only available on IPF.

  @return The current value of KR2.

**/
UINT64
EFIAPI
AsmReadKr2 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #3 (KR3).
  This function is only available on IPF.

  @return The current value of KR3.

**/
UINT64
EFIAPI
AsmReadKr3 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #4 (KR4).
  This function is only available on IPF.

  @return The current value of KR4.

**/
UINT64
EFIAPI
AsmReadKr4 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #5 (KR5).
  This function is only available on IPF.

  @return The current value of KR5.

**/
UINT64
EFIAPI
AsmReadKr5 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #6 (KR6).
  This function is only available on IPF.

  @return The current value of KR6.

**/
UINT64
EFIAPI
AsmReadKr6 (
  VOID
  );


/**
  Reads the current value of 64-bit Kernel Register #7 (KR7).
  This function is only available on IPF.

  @return The current value of KR7.

**/
UINT64
EFIAPI
AsmReadKr7 (
  VOID
  );


/**
  Write the current value of 64-bit Kernel Register #0 (KR0).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR0.

  @return The 64-bit value written to the KR0.

**/
UINT64
EFIAPI
AsmWriteKr0 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #1 (KR1).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR1.

  @return The 64-bit value written to the KR1.

**/
UINT64
EFIAPI
AsmWriteKr1 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #2 (KR2).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR2.

  @return The 64-bit value written to the KR2.

**/
UINT64
EFIAPI
AsmWriteKr2 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #3 (KR3).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR3.

  @return The 64-bit value written to the KR3.

**/
UINT64
EFIAPI
AsmWriteKr3 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #4 (KR4).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR4.

  @return The 64-bit value written to the KR4.

**/
UINT64
EFIAPI
AsmWriteKr4 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #5 (KR5).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR5.

  @return The 64-bit value written to the KR5.

**/
UINT64
EFIAPI
AsmWriteKr5 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #6 (KR6).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR6.

  @return The 64-bit value written to the KR6.

**/
UINT64
EFIAPI
AsmWriteKr6 (
  IN UINT64  Value
  );


/**
  Write the current value of 64-bit Kernel Register #7 (KR7).
  This function is only available on IPF.

  @param  Value 	The 64-bit value to write to KR7.

  @return The 64-bit value written to the KR7.

**/
UINT64
EFIAPI
AsmWriteKr7 (
  IN UINT64  Value
  );


/**
  Reads the current value of Interval Timer Counter Register (ITC).
  This function is only available on IPF.

  @return The current value of ITC.

**/
UINT64
EFIAPI
AsmReadItc (
  VOID
  );


/**
  Reads the current value of Interval Timer Vector Register (ITV).
  This function is only available on IPF.

  @return The current value of ITV.

**/
UINT64
EFIAPI
AsmReadItv (
  VOID
  );


/**
  Reads the current value of Interval Timer Match Register (ITM).
  This function is only available on IPF.

  @return The current value of ITM.
**/
UINT64
EFIAPI
AsmReadItm (
  VOID
  );


/**
  Writes the current value of 64-bit Interval Timer Counter Register (ITC).
  This function is only available on IPF.

  @param Value		The 64-bit value to write to ITC.

  @return The 64-bit value written to the ITC.

**/
UINT64
EFIAPI
AsmWriteItc (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Interval Timer Match Register (ITM).
  This function is only available on IPF.

  @param Value		The 64-bit value to write to ITM.

  @return The 64-bit value written to the ITM.

**/
UINT64
EFIAPI
AsmWriteItm (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Interval Timer Vector Register (ITV).
  No parameter checking is performed on Value.  All bits of Value corresponding to
  reserved fields of ITV must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to ITV.

  @return The 64-bit value written to the ITV.

**/
UINT64
EFIAPI
AsmWriteItv (
  IN UINT64  Value
  );


/**
  Reads the current value of Default Control Register (DCR).
  This function is only available on IPF.

  @return The current value of DCR.

**/
UINT64
EFIAPI
AsmReadDcr (
  VOID
  );


/**
  Reads the current value of Interruption Vector Address Register (IVA).
  This function is only available on IPF.

  @return The current value of IVA.
**/
UINT64
EFIAPI
AsmReadIva (
  VOID
  );


/**
  Reads the current value of Page Table Address Register (PTA).
  This function is only available on IPF.

  @return The current value of PTA.

**/
UINT64
EFIAPI
AsmReadPta (
  VOID
  );


/**
  Writes the current value of 64-bit Default Control Register (DCR).
  No parameter checking is performed on Value.  All bits of Value corresponding to
  reserved fields of DCR must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to DCR.

  @return The 64-bit value written to the DCR.

**/
UINT64
EFIAPI
AsmWriteDcr (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Interruption Vector Address Register (IVA).
  The size of vector table is 32 K bytes and is 32 K bytes aligned
  the low 15 bits of Value is ignored when written.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to IVA.

  @return The 64-bit value written to the IVA.

**/
UINT64
EFIAPI
AsmWriteIva (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Page Table Address Register (PTA).
  No parameter checking is performed on Value.  All bits of Value corresponding to
  reserved fields of DCR must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to PTA.

  @return The 64-bit value written to the PTA.
**/
UINT64
EFIAPI
AsmWritePta (
  IN UINT64  Value
  );


/**
  Reads the current value of Local Interrupt ID Register (LID).
  This function is only available on IPF.

  @return The current value of LID.

**/
UINT64
EFIAPI
AsmReadLid (
  VOID
  );


/**
  Reads the current value of External Interrupt Vector Register (IVR).
  This function is only available on IPF.

  @return The current value of IVR.

**/
UINT64
EFIAPI
AsmReadIvr (
  VOID
  );


/**
  Reads the current value of Task Priority Register (TPR).
  This function is only available on IPF.

  @return The current value of TPR.

**/
UINT64
EFIAPI
AsmReadTpr (
  VOID
  );


/**
  Reads the current value of External Interrupt Request Register #0 (IRR0).
  This function is only available on IPF.

  @return The current value of IRR0.

**/
UINT64
EFIAPI
AsmReadIrr0 (
  VOID
  );


/**
  Reads the current value of External Interrupt Request Register #1 (IRR1).
  This function is only available on IPF.

  @return The current value of IRR1.

**/
UINT64
EFIAPI
AsmReadIrr1 (
  VOID
  );


/**
  Reads the current value of External Interrupt Request Register #2 (IRR2).
  This function is only available on IPF.

  @return The current value of IRR2.

**/
UINT64
EFIAPI
AsmReadIrr2 (
  VOID
  );


/**
  Reads the current value of External Interrupt Request Register #3 (IRR3).
  This function is only available on IPF.

  @return The current value of IRR3.

**/
UINT64
EFIAPI
AsmReadIrr3 (
  VOID
  );


/**
  Reads the current value of Performance Monitor Vector Register (PMV).
  This function is only available on IPF.

  @return The current value of PMV.

**/
UINT64
EFIAPI
AsmReadPmv (
  VOID
  );


/**
  Reads the current value of Corrected Machine Check Vector Register (CMCV).
  This function is only available on IPF.

  @return The current value of CMCV.

**/
UINT64
EFIAPI
AsmReadCmcv (
  VOID
  );


/**
  Reads the current value of Local Redirection Register #0 (LRR0).
  This function is only available on IPF.

  @return The current value of LRR0.

**/
UINT64
EFIAPI
AsmReadLrr0 (
  VOID
  );


/**
  Reads the current value of Local Redirection Register #1 (LRR1).
  This function is only available on IPF.

  @return The current value of LRR1.

**/
UINT64
EFIAPI
AsmReadLrr1 (
  VOID
  );


/**
  Writes the current value of 64-bit Page Local Interrupt ID Register (LID).
  No parameter checking is performed on Value.  All bits of Value corresponding to
  reserved fields of LID must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to LID.

  @return The 64-bit value written to the LID.

**/
UINT64
EFIAPI
AsmWriteLid (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Task Priority Register (TPR).
  No parameter checking is performed on Value.  All bits of Value corresponding to
  reserved fields of TPR must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to TPR.

  @return The 64-bit value written to the TPR.

**/
UINT64
EFIAPI
AsmWriteTpr (
  IN UINT64  Value
  );


/**
  Performs a write operation on End OF External Interrupt Register (EOI).
  Writes a value of 0 to the EOI Register.  This function is only available on IPF.

**/
VOID
EFIAPI
AsmWriteEoi (
  VOID
  );


/**
  Writes the current value of 64-bit Performance Monitor Vector Register (PMV).
  No parameter checking is performed on Value.  All bits of Value corresponding
  to reserved fields of PMV must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to PMV.

  @return The 64-bit value written to the PMV.

**/
UINT64
EFIAPI
AsmWritePmv (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Corrected Machine Check Vector Register (CMCV).
  No parameter checking is performed on Value.  All bits of Value corresponding
  to reserved fields of CMCV must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to CMCV.

  @return The 64-bit value written to the CMCV.

**/
UINT64
EFIAPI
AsmWriteCmcv (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Local Redirection Register #0 (LRR0).
  No parameter checking is performed on Value.  All bits of Value corresponding
  to reserved fields of LRR0 must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to LRR0.

  @return The 64-bit value written to the LRR0.

**/
UINT64
EFIAPI
AsmWriteLrr0 (
  IN UINT64  Value
  );


/**
  Writes the current value of 64-bit Local Redirection Register #1 (LRR1).
  No parameter checking is performed on Value.  All bits of Value corresponding
  to reserved fields of LRR1 must be 0 or a Reserved Register/Field fault may occur.
  The caller must either guarantee that Value is valid, or the caller must
  set up fault handlers to catch the faults.
  This function is only available on IPF.

  @param Value		The 64-bit value to write to LRR1.

  @return The 64-bit value written to the LRR1.

**/
UINT64
EFIAPI
AsmWriteLrr1 (
  IN UINT64  Value
  );


/**
  Reads the current value of Instruction Breakpoint Register (IBR).
  
  The Instruction Breakpoint Registers are used in pairs.  The even numbered
  registers contain breakpoint addresses, and the odd numbered registers contain
  breakpoint mask conditions.  At least 4 instruction registers pairs are implemented
  on all processor models.   Implemented registers are contiguous starting with
  register 0.  No parameter checking is performed on Index, and if the Index value
  is beyond the implemented IBR register range, a Reserved Register/Field fault may
  occur.  The caller must either guarantee that Index is valid, or the caller must
  set up fault handlers to catch the faults.
  This function is only available on IPF.

  @param Index		The 8-bit Instruction Breakpoint Register index to read.

  @return The current value of Instruction Breakpoint Register specified by Index.

**/
UINT64
EFIAPI
AsmReadIbr (
  IN  UINT8   Index
  );


/**
  Reads the current value of Data Breakpoint Register (DBR).

  The Data Breakpoint Registers are used in pairs.  The even numbered registers
  contain breakpoint addresses, and odd numbered registers contain breakpoint
  mask conditions.  At least 4 data registers pairs are implemented on all processor
  models.  Implemented registers are contiguous starting with register 0.
  No parameter checking is performed on Index.  If the Index value is beyond
  the implemented DBR register range, a Reserved Register/Field fault may occur.
  The caller must either guarantee that Index is valid, or the caller must set up
  fault handlers to catch the faults.
  This function is only available on IPF.

  @param Index		The 8-bit Data Breakpoint Register index to read.

  @return The current value of Data Breakpoint Register specified by Index.

**/
UINT64
EFIAPI
AsmReadDbr (
  IN  UINT8   Index
  );


/**
  Reads the current value of Performance Monitor Configuration Register (PMC).

  All processor implementations provide at least 4 performance counters
  (PMC/PMD [4]...PMC/PMD [7] pairs), and 4 performance monitor counter overflow