uefi/linaro-edk2/ArmPkg/Library/BaseMemoryLibStm/AArch64/SetMem.c

/** @file

  Copyright (c) 2012-2013, ARM Ltd. All rights reserved.<BR>

  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.

**/

#include "MemLibInternals.h"

/**
  Set Buffer to Value for Size bytes.

  @param  Buffer   Memory to set.
  @param  Length   Number of bytes to set
  @param  Value    Value of the set operation.

  @return Buffer

**/
VOID *
EFIAPI
InternalMemSetMem (
  OUT     VOID                      *Buffer,
  IN      UINTN                     Length,
  IN      UINT8                     Value
  )
{
  //
  // Declare the local variables that actually move the data elements as
  // volatile to prevent the optimizer from replacing this function with
  // the intrinsic memset()
  //
  volatile UINT8                    *Pointer8;
  volatile UINT32                   *Pointer32;
  volatile UINT64                   *Pointer64;
  UINT32                            Value32;
  UINT64                            Value64;

  if ((((UINTN)Buffer & 0x7) == 0) && (Length >= 8)) {
    // Generate the 64bit value
    Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
    Value64 = (((UINT64)Value32) << 32) | Value32;

    Pointer64 = (UINT64*)Buffer;
    while (Length >= 8) {
      *(Pointer64++) = Value64;
      Length -= 8;
    }

    // Finish with bytes if needed
    Pointer8 = (UINT8*)Pointer64;
    while (Length-- > 0) {
      *(Pointer8++) = Value;
    }
  } else if ((((UINTN)Buffer & 0x3) == 0) && (Length >= 4)) {
    // Generate the 32bit value
    Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;

    Pointer32 = (UINT32*)Buffer;
    while (Length >= 4) {
      *(Pointer32++) = Value32;
      Length -= 4;
    }

    // Finish with bytes if needed
    Pointer8 = (UINT8*)Pointer32;
    while (Length-- > 0) {
      *(Pointer8++) = Value;
    }
  } else {
    Pointer8 = (UINT8*)Buffer;
    while (Length-- > 0) {
      *(Pointer8++) = Value;
    }
  }
  return Buffer;
}