mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-27 12:15:19 +01:00
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
|
/** @file
|
||
|
|
Implementation of the EfiSetMem routine. This function is broken
|
||
|
|
out into its own source file so that it can be excluded from a
|
||
|
|
build for a particular platform easily if an optimized version
|
||
|
|
is desired.
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
|
||
|
|
Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
|
||
|
|
Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
|
||
|
|
|
||
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#include "MemLibInternals.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
Set Buffer to Value for Size bytes.
|
||
|
|
|
||
|
|
@param Buffer The memory to set.
|
||
|
|
@param Length The number of bytes to set.
|
||
|
|
@param Value The 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 = LShiftU64 (Value32, 32) | Value32;
|
||
|
|
|
||
|
|
Pointer64 = (UINT64*)Buffer;
|
||
|
|
while (Length >= 8) {
|
||
|
|
*(Pointer64++) = Value64;
|
||
|
|
Length -= 8;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Finish with bytes if needed
|
||
|
|
Pointer8 = (UINT8*)Pointer64;
|
||
|
|
} 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;
|
||
|
|
} else {
|
||
|
|
Pointer8 = (UINT8*)Buffer;
|
||
|
|
}
|
||
|
|
while (Length-- > 0) {
|
||
|
|
*(Pointer8++) = Value;
|
||
|
|
}
|
||
|
|
return Buffer;
|
||
|
|
}
|