/** @file\r
Bit field functions of BaseLib.\r
\r
- Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
- All rights reserved. This program and the accompanying materials\r
+ Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+ This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php\r
+ http://opensource.org/licenses/bsd-license.php.\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#include "BaseLibInternals.h"\r
\r
/**\r
- Worker function that returns a bit field from Operand\r
+ Worker function that returns a bit field from Operand.\r
\r
Returns the bitfield specified by the StartBit and the EndBit from Operand.\r
\r
@return The bit field read.\r
\r
**/\r
-unsigned int\r
+UINTN\r
EFIAPI\r
-BitFieldReadUint (\r
- IN unsigned int Operand,\r
+InternalBaseLibBitFieldReadUint (\r
+ IN UINTN Operand,\r
IN UINTN StartBit,\r
IN UINTN EndBit\r
)\r
{\r
//\r
- // ~((unsigned int)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r
+ // ~((UINTN)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r
// are 1's while bit[EndBit + 1] thru the most significant bit are 0's.\r
//\r
- return (Operand & ~((unsigned int)-2 << EndBit)) >> StartBit;\r
+ return (Operand & ~((UINTN)-2 << EndBit)) >> StartBit;\r
}\r
\r
/**\r
- Worker function that reads a bit field from Operand, performs a bitwise OR, \r
+ Worker function that reads a bit field from Operand, performs a bitwise OR,\r
and returns the result.\r
\r
Performs a bitwise OR between the bit field specified by StartBit and EndBit\r
in Operand and the value specified by AndData. All other bits in Operand are\r
preserved. The new value is returned.\r
\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
+\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
- @param OrData The value to OR with the read value from the value\r
+ @param OrData The value to OR with the read value from the value.\r
\r
@return The new value.\r
\r
**/\r
-unsigned int\r
+UINTN\r
EFIAPI\r
-BitFieldOrUint (\r
- IN unsigned int Operand,\r
+InternalBaseLibBitFieldOrUint (\r
+ IN UINTN Operand,\r
IN UINTN StartBit,\r
IN UINTN EndBit,\r
- IN unsigned int OrData\r
+ IN UINTN OrData\r
)\r
{\r
//\r
- // ~((unsigned int)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r
+ // Higher bits in OrData those are not used must be zero.\r
+ //\r
+ // EndBit - StartBit + 1 might be 32 while the result right shifting 32 on a 32bit integer is undefined,\r
+ // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r
+ //\r
+ ASSERT ((OrData >> (EndBit - StartBit)) == ((OrData >> (EndBit - StartBit)) & 1));\r
+\r
+ //\r
+ // ~((UINTN)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r
// are 1's while bit[EndBit + 1] thru the most significant bit are 0's.\r
//\r
- return Operand | ((OrData << StartBit) & ~((unsigned int) -2 << EndBit));\r
+ return Operand | ((OrData << StartBit) & ~((UINTN) -2 << EndBit));\r
}\r
\r
/**\r
- Worker function that reads a bit field from Operand, performs a bitwise AND, \r
+ Worker function that reads a bit field from Operand, performs a bitwise AND,\r
and returns the result.\r
\r
Performs a bitwise AND between the bit field specified by StartBit and EndBit\r
in Operand and the value specified by AndData. All other bits in Operand are\r
preserved. The new value is returned.\r
\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
+\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
- @param AndData The value to And with the read value from the value\r
+ @param AndData The value to And with the read value from the value.\r
\r
@return The new value.\r
\r
**/\r
-unsigned int\r
+UINTN\r
EFIAPI\r
-BitFieldAndUint (\r
- IN unsigned int Operand,\r
+InternalBaseLibBitFieldAndUint (\r
+ IN UINTN Operand,\r
IN UINTN StartBit,\r
IN UINTN EndBit,\r
- IN unsigned int AndData\r
+ IN UINTN AndData\r
)\r
{\r
//\r
- // ~((unsigned int)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r
+ // Higher bits in AndData those are not used must be zero.\r
+ //\r
+ // EndBit - StartBit + 1 might be 32 while the result right shifting 32 on a 32bit integer is undefined,\r
+ // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r
+ //\r
+ ASSERT ((AndData >> (EndBit - StartBit)) == ((AndData >> (EndBit - StartBit)) & 1));\r
+\r
+ //\r
+ // ~((UINTN)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r
// are 1's while bit[EndBit + 1] thru the most significant bit are 0's.\r
//\r
- return Operand & ~((~AndData << StartBit) & ~((unsigned int) -2 << EndBit));\r
+ return Operand & ~((~AndData << StartBit) & ~((UINTN)-2 << EndBit));\r
}\r
\r
/**\r
{\r
ASSERT (EndBit < 8);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT8)BitFieldReadUint (Operand, StartBit, EndBit);\r
+ return (UINT8)InternalBaseLibBitFieldReadUint (Operand, StartBit, EndBit);\r
}\r
\r
/**\r
If StartBit is greater than 7, then ASSERT().\r
If EndBit is greater than 7, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..7.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..7.\r
- @param Value New value of the bit field.\r
+ @param Value The new value of the bit field.\r
\r
@return The new 8-bit value.\r
\r
Reads a bit field from an 8-bit value, performs a bitwise OR, and returns the\r
result.\r
\r
- Performs a bitwise inclusive OR between the bit field specified by StartBit\r
+ Performs a bitwise OR between the bit field specified by StartBit\r
and EndBit in Operand and the value specified by OrData. All other bits in\r
Operand are preserved. The new 8-bit value is returned.\r
\r
If StartBit is greater than 7, then ASSERT().\r
If EndBit is greater than 7, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..7.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..7.\r
- @param OrData The value to OR with the read value from the value\r
+ @param OrData The value to OR with the read value from the value.\r
\r
@return The new 8-bit value.\r
\r
{\r
ASSERT (EndBit < 8);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT8)BitFieldOrUint (Operand, StartBit, EndBit, OrData);\r
+ return (UINT8)InternalBaseLibBitFieldOrUint (Operand, StartBit, EndBit, OrData);\r
}\r
\r
/**\r
If StartBit is greater than 7, then ASSERT().\r
If EndBit is greater than 7, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
{\r
ASSERT (EndBit < 8);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT8)BitFieldAndUint (Operand, StartBit, EndBit, AndData);\r
+ return (UINT8)InternalBaseLibBitFieldAndUint (Operand, StartBit, EndBit, AndData);\r
}\r
\r
/**\r
\r
Performs a bitwise AND between the bit field specified by StartBit and EndBit\r
in Operand and the value specified by AndData, followed by a bitwise\r
- inclusive OR with value specified by OrData. All other bits in Operand are\r
+ OR with value specified by OrData. All other bits in Operand are\r
preserved. The new 8-bit value is returned.\r
\r
If 8-bit operations are not supported, then ASSERT().\r
If StartBit is greater than 7, then ASSERT().\r
If EndBit is greater than 7, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
{\r
ASSERT (EndBit < 16);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT16)BitFieldReadUint (Operand, StartBit, EndBit);\r
+ return (UINT16)InternalBaseLibBitFieldReadUint (Operand, StartBit, EndBit);\r
}\r
\r
/**\r
If StartBit is greater than 15, then ASSERT().\r
If EndBit is greater than 15, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..15.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..15.\r
- @param Value New value of the bit field.\r
+ @param Value The new value of the bit field.\r
\r
@return The new 16-bit value.\r
\r
Reads a bit field from a 16-bit value, performs a bitwise OR, and returns the\r
result.\r
\r
- Performs a bitwise inclusive OR between the bit field specified by StartBit\r
+ Performs a bitwise OR between the bit field specified by StartBit\r
and EndBit in Operand and the value specified by OrData. All other bits in\r
Operand are preserved. The new 16-bit value is returned.\r
\r
If StartBit is greater than 15, then ASSERT().\r
If EndBit is greater than 15, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..15.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..15.\r
- @param OrData The value to OR with the read value from the value\r
+ @param OrData The value to OR with the read value from the value.\r
\r
@return The new 16-bit value.\r
\r
{\r
ASSERT (EndBit < 16);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT16)BitFieldOrUint (Operand, StartBit, EndBit, OrData);\r
+ return (UINT16)InternalBaseLibBitFieldOrUint (Operand, StartBit, EndBit, OrData);\r
}\r
\r
/**\r
If StartBit is greater than 15, then ASSERT().\r
If EndBit is greater than 15, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..15.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..15.\r
- @param AndData The value to AND with the read value from the value\r
+ @param AndData The value to AND with the read value from the value.\r
\r
@return The new 16-bit value.\r
\r
{\r
ASSERT (EndBit < 16);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT16)BitFieldAndUint (Operand, StartBit, EndBit, AndData);\r
+ return (UINT16)InternalBaseLibBitFieldAndUint (Operand, StartBit, EndBit, AndData);\r
}\r
\r
/**\r
\r
Performs a bitwise AND between the bit field specified by StartBit and EndBit\r
in Operand and the value specified by AndData, followed by a bitwise\r
- inclusive OR with value specified by OrData. All other bits in Operand are\r
+ OR with value specified by OrData. All other bits in Operand are\r
preserved. The new 16-bit value is returned.\r
\r
If 16-bit operations are not supported, then ASSERT().\r
If StartBit is greater than 15, then ASSERT().\r
If EndBit is greater than 15, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
{\r
ASSERT (EndBit < 32);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT32)BitFieldReadUint (Operand, StartBit, EndBit);\r
+ return (UINT32)InternalBaseLibBitFieldReadUint (Operand, StartBit, EndBit);\r
}\r
\r
/**\r
If StartBit is greater than 31, then ASSERT().\r
If EndBit is greater than 31, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..31.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..31.\r
- @param Value New value of the bit field.\r
+ @param Value The new value of the bit field.\r
\r
@return The new 32-bit value.\r
\r
Reads a bit field from a 32-bit value, performs a bitwise OR, and returns the\r
result.\r
\r
- Performs a bitwise inclusive OR between the bit field specified by StartBit\r
+ Performs a bitwise OR between the bit field specified by StartBit\r
and EndBit in Operand and the value specified by OrData. All other bits in\r
Operand are preserved. The new 32-bit value is returned.\r
\r
If StartBit is greater than 31, then ASSERT().\r
If EndBit is greater than 31, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..31.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..31.\r
- @param OrData The value to OR with the read value from the value\r
+ @param OrData The value to OR with the read value from the value.\r
\r
@return The new 32-bit value.\r
\r
{\r
ASSERT (EndBit < 32);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT32)BitFieldOrUint (Operand, StartBit, EndBit, OrData);\r
+ return (UINT32)InternalBaseLibBitFieldOrUint (Operand, StartBit, EndBit, OrData);\r
}\r
\r
/**\r
If StartBit is greater than 31, then ASSERT().\r
If EndBit is greater than 31, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..31.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..31.\r
- @param AndData The value to AND with the read value from the value\r
+ @param AndData The value to AND with the read value from the value.\r
\r
@return The new 32-bit value.\r
\r
{\r
ASSERT (EndBit < 32);\r
ASSERT (StartBit <= EndBit);\r
- return (UINT32)BitFieldAndUint (Operand, StartBit, EndBit, AndData);\r
+ return (UINT32)InternalBaseLibBitFieldAndUint (Operand, StartBit, EndBit, AndData);\r
}\r
\r
/**\r
\r
Performs a bitwise AND between the bit field specified by StartBit and EndBit\r
in Operand and the value specified by AndData, followed by a bitwise\r
- inclusive OR with value specified by OrData. All other bits in Operand are\r
+ OR with value specified by OrData. All other bits in Operand are\r
preserved. The new 32-bit value is returned.\r
\r
If 32-bit operations are not supported, then ASSERT().\r
If StartBit is greater than 31, then ASSERT().\r
If EndBit is greater than 31, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
If StartBit is greater than 63, then ASSERT().\r
If EndBit is greater than 63, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..63.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..63.\r
- @param Value New value of the bit field.\r
+ @param Value The new value of the bit field.\r
\r
@return The new 64-bit value.\r
\r
Reads a bit field from a 64-bit value, performs a bitwise OR, and returns the\r
result.\r
\r
- Performs a bitwise inclusive OR between the bit field specified by StartBit\r
+ Performs a bitwise OR between the bit field specified by StartBit\r
and EndBit in Operand and the value specified by OrData. All other bits in\r
Operand are preserved. The new 64-bit value is returned.\r
\r
If StartBit is greater than 63, then ASSERT().\r
If EndBit is greater than 63, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
\r
ASSERT (EndBit < 64);\r
ASSERT (StartBit <= EndBit);\r
+ //\r
+ // Higher bits in OrData those are not used must be zero.\r
+ //\r
+ // EndBit - StartBit + 1 might be 64 while the result right shifting 64 on RShiftU64() API is invalid,\r
+ // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r
+ //\r
+ ASSERT (RShiftU64 (OrData, EndBit - StartBit) == (RShiftU64 (OrData, EndBit - StartBit) & 1));\r
\r
Value1 = LShiftU64 (OrData, StartBit);\r
Value2 = LShiftU64 ((UINT64) - 2, EndBit);\r
If StartBit is greater than 63, then ASSERT().\r
If EndBit is greater than 63, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
Range 0..63.\r
@param EndBit The ordinal of the most significant bit in the bit field.\r
Range 0..63.\r
- @param AndData The value to AND with the read value from the value\r
+ @param AndData The value to AND with the read value from the value.\r
\r
@return The new 64-bit value.\r
\r
{\r
UINT64 Value1;\r
UINT64 Value2;\r
- \r
+\r
ASSERT (EndBit < 64);\r
ASSERT (StartBit <= EndBit);\r
+ //\r
+ // Higher bits in AndData those are not used must be zero.\r
+ //\r
+ // EndBit - StartBit + 1 might be 64 while the right shifting 64 on RShiftU64() API is invalid,\r
+ // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r
+ //\r
+ ASSERT (RShiftU64 (AndData, EndBit - StartBit) == (RShiftU64 (AndData, EndBit - StartBit) & 1));\r
\r
Value1 = LShiftU64 (~AndData, StartBit);\r
Value2 = LShiftU64 ((UINT64)-2, EndBit);\r
\r
Performs a bitwise AND between the bit field specified by StartBit and EndBit\r
in Operand and the value specified by AndData, followed by a bitwise\r
- inclusive OR with value specified by OrData. All other bits in Operand are\r
+ OR with value specified by OrData. All other bits in Operand are\r
preserved. The new 64-bit value is returned.\r
\r
If 64-bit operations are not supported, then ASSERT().\r
If StartBit is greater than 63, then ASSERT().\r
If EndBit is greater than 63, then ASSERT().\r
If EndBit is less than StartBit, then ASSERT().\r
+ If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
+ If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r
\r
@param Operand Operand on which to perform the bitfield operation.\r
@param StartBit The ordinal of the least significant bit in the bit field.\r
OrData\r
);\r
}\r
+\r
+/**\r
+ Reads a bit field from a 32-bit value, counts and returns\r
+ the number of set bits.\r
+\r
+ Counts the number of set bits in the bit field specified by\r
+ StartBit and EndBit in Operand. The count is returned.\r
+\r
+ If StartBit is greater than 31, then ASSERT().\r
+ If EndBit is greater than 31, then ASSERT().\r
+ If EndBit is less than StartBit, then ASSERT().\r
+\r
+ @param Operand Operand on which to perform the bitfield operation.\r
+ @param StartBit The ordinal of the least significant bit in the bit field.\r
+ Range 0..31.\r
+ @param EndBit The ordinal of the most significant bit in the bit field.\r
+ Range 0..31.\r
+\r
+ @return The number of bits set between StartBit and EndBit.\r
+\r
+**/\r
+UINT8\r
+EFIAPI\r
+BitFieldCountOnes32 (\r
+ IN UINT32 Operand,\r
+ IN UINTN StartBit,\r
+ IN UINTN EndBit\r
+ )\r
+{\r
+ UINT32 Count;\r
+\r
+ ASSERT (EndBit < 32);\r
+ ASSERT (StartBit <= EndBit);\r
+\r
+ Count = BitFieldRead32 (Operand, StartBit, EndBit);\r
+ Count -= ((Count >> 1) & 0x55555555);\r
+ Count = (Count & 0x33333333) + ((Count >> 2) & 0x33333333);\r
+ Count += Count >> 4;\r
+ Count &= 0x0F0F0F0F;\r
+ Count += Count >> 8;\r
+ Count += Count >> 16;\r
+\r
+ return (UINT8) Count & 0x3F;\r
+}\r
+\r
+/**\r
+ Reads a bit field from a 64-bit value, counts and returns\r
+ the number of set bits.\r
+\r
+ Counts the number of set bits in the bit field specified by\r
+ StartBit and EndBit in Operand. The count is returned.\r
+\r
+ If StartBit is greater than 63, then ASSERT().\r
+ If EndBit is greater than 63, then ASSERT().\r
+ If EndBit is less than StartBit, then ASSERT().\r
+\r
+ @param Operand Operand on which to perform the bitfield operation.\r
+ @param StartBit The ordinal of the least significant bit in the bit field.\r
+ Range 0..63.\r
+ @param EndBit The ordinal of the most significant bit in the bit field.\r
+ Range 0..63.\r
+\r
+ @return The number of bits set between StartBit and EndBit.\r
+\r
+**/\r
+UINT8\r
+EFIAPI\r
+BitFieldCountOnes64 (\r
+ IN UINT64 Operand,\r
+ IN UINTN StartBit,\r
+ IN UINTN EndBit\r
+ )\r
+{\r
+ UINT64 BitField;\r
+ UINT8 Count;\r
+\r
+ ASSERT (EndBit < 64);\r
+ ASSERT (StartBit <= EndBit);\r
+\r
+ BitField = BitFieldRead64 (Operand, StartBit, EndBit);\r
+ Count = BitFieldCountOnes32 ((UINT32) BitField, 0, 31);\r
+ Count += BitFieldCountOnes32 ((UINT32) RShiftU64(BitField, 32), 0, 31);\r
+\r
+ return Count;\r
+}\r
+\r
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