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[mirror_edk2.git] / MdePkg / Library / BaseLib / Arm / Unaligned.c

/** @file\r
  Unaligned access functions of BaseLib for ARM.\r
\r
  volatile was added to work around optimization issues.\r
\r
  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "BaseLibInternals.h"\r
\r
/**\r
  Reads a 16-bit value from memory that may be unaligned.\r
\r
  This function returns the 16-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 16-bit value that may be unaligned.\r
\r
  @return The 16-bit value read from Buffer.\r
\r
**/\r
UINT16\r
EFIAPI\r
ReadUnaligned16 (\r
  IN CONST UINT16  *Buffer\r
  )\r
{\r
  volatile UINT8  LowerByte;\r
  volatile UINT8  HigherByte;\r
\r
  ASSERT (Buffer != NULL);\r
\r
  LowerByte  = ((UINT8 *)Buffer)[0];\r
  HigherByte = ((UINT8 *)Buffer)[1];\r
\r
  return (UINT16)(LowerByte | (HigherByte << 8));\r
}\r
\r
/**\r
  Writes a 16-bit value to memory that may be unaligned.\r
\r
  This function writes the 16-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 16-bit value that may be unaligned.\r
  @param  Value   16-bit value to write to Buffer.\r
\r
  @return The 16-bit value to write to Buffer.\r
\r
**/\r
UINT16\r
EFIAPI\r
WriteUnaligned16 (\r
  OUT UINT16  *Buffer,\r
  IN  UINT16  Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  ((volatile UINT8 *)Buffer)[0] = (UINT8)Value;\r
  ((volatile UINT8 *)Buffer)[1] = (UINT8)(Value >> 8);\r
\r
  return Value;\r
}\r
\r
/**\r
  Reads a 24-bit value from memory that may be unaligned.\r
\r
  This function returns the 24-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 24-bit value that may be unaligned.\r
\r
  @return The 24-bit value read from Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
ReadUnaligned24 (\r
  IN CONST UINT32  *Buffer\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  return (UINT32)(\r
                  ReadUnaligned16 ((UINT16 *)Buffer) |\r
                  (((UINT8 *)Buffer)[2] << 16)\r
                  );\r
}\r
\r
/**\r
  Writes a 24-bit value to memory that may be unaligned.\r
\r
  This function writes the 24-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 24-bit value that may be unaligned.\r
  @param  Value   24-bit value to write to Buffer.\r
\r
  @return The 24-bit value to write to Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
WriteUnaligned24 (\r
  OUT UINT32  *Buffer,\r
  IN  UINT32  Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  WriteUnaligned16 ((UINT16 *)Buffer, (UINT16)Value);\r
  *(UINT8 *)((UINT16 *)Buffer + 1) = (UINT8)(Value >> 16);\r
  return Value;\r
}\r
\r
/**\r
  Reads a 32-bit value from memory that may be unaligned.\r
\r
  This function returns the 32-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 32-bit value that may be unaligned.\r
\r
  @return The 32-bit value read from Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
ReadUnaligned32 (\r
  IN CONST UINT32  *Buffer\r
  )\r
{\r
  UINT16  LowerBytes;\r
  UINT16  HigherBytes;\r
\r
  ASSERT (Buffer != NULL);\r
\r
  LowerBytes  = ReadUnaligned16 ((UINT16 *)Buffer);\r
  HigherBytes = ReadUnaligned16 ((UINT16 *)Buffer + 1);\r
\r
  return (UINT32)(LowerBytes | (HigherBytes << 16));\r
}\r
\r
/**\r
  Writes a 32-bit value to memory that may be unaligned.\r
\r
  This function writes the 32-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 32-bit value that may be unaligned.\r
  @param  Value   32-bit value to write to Buffer.\r
\r
  @return The 32-bit value to write to Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
WriteUnaligned32 (\r
  OUT UINT32  *Buffer,\r
  IN  UINT32  Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  WriteUnaligned16 ((UINT16 *)Buffer, (UINT16)Value);\r
  WriteUnaligned16 ((UINT16 *)Buffer + 1, (UINT16)(Value >> 16));\r
  return Value;\r
}\r
\r
/**\r
  Reads a 64-bit value from memory that may be unaligned.\r
\r
  This function returns the 64-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 64-bit value that may be unaligned.\r
\r
  @return The 64-bit value read from Buffer.\r
\r
**/\r
UINT64\r
EFIAPI\r
ReadUnaligned64 (\r
  IN CONST UINT64  *Buffer\r
  )\r
{\r
  UINT32  LowerBytes;\r
  UINT32  HigherBytes;\r
\r
  ASSERT (Buffer != NULL);\r
\r
  LowerBytes  = ReadUnaligned32 ((UINT32 *)Buffer);\r
  HigherBytes = ReadUnaligned32 ((UINT32 *)Buffer + 1);\r
\r
  return (UINT64)(LowerBytes | LShiftU64 (HigherBytes, 32));\r
}\r
\r
/**\r
  Writes a 64-bit value to memory that may be unaligned.\r
\r
  This function writes the 64-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  The pointer to a 64-bit value that may be unaligned.\r
  @param  Value   64-bit value to write to Buffer.\r
\r
  @return The 64-bit value to write to Buffer.\r
\r
**/\r
UINT64\r
EFIAPI\r
WriteUnaligned64 (\r
  OUT UINT64  *Buffer,\r
  IN  UINT64  Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  WriteUnaligned32 ((UINT32 *)Buffer, (UINT32)Value);\r
  WriteUnaligned32 ((UINT32 *)Buffer + 1, (UINT32)RShiftU64 (Value, 32));\r
  return Value;\r
}\r