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https://github.com/CloverHackyColor/CloverBootloader.git
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82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/** @file
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Implementation of the EfiSetMem routine. This function is broken
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out into its own source file so that it can be excluded from a
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build for a particular platform easily if an optimized version
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is desired.
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
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Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "MemLibInternals.h"
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/**
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Set Buffer to Value for Size bytes.
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@param Buffer The memory to set.
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@param Length The number of bytes to set.
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@param Value The value of the set operation.
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@return Buffer
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**/
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VOID *
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EFIAPI
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InternalMemSetMem(
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OUT VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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)
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{
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//
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// Declare the local variables that actually move the data elements as
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// volatile to prevent the optimizer from replacing this function with
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// the intrinsic memset()
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//
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volatile UINT8 *Pointer8;
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volatile UINT32 *Pointer32;
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volatile UINT64 *Pointer64;
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UINT32 Value32;
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UINT64 Value64;
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if ((((UINTN)Buffer & 0x7) == 0) && (Length >= 8)) {
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// Generate the 64bit value
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Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
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Value64 = LShiftU64 (Value32, 32) | Value32;
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Pointer64 = (UINT64*)Buffer;
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while (Length >= 8) {
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*(Pointer64++) = Value64;
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Length -= 8;
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}
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// Finish with bytes if needed
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Pointer8 = (UINT8*)Pointer64;
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} else if ((((UINTN)Buffer & 0x3) == 0) && (Length >= 4)) {
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// Generate the 32bit value
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Value32 = (Value << 24) | (Value << 16) | (Value << 8) | Value;
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Pointer32 = (UINT32*)Buffer;
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while (Length >= 4) {
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*(Pointer32++) = Value32;
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Length -= 4;
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}
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// Finish with bytes if needed
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Pointer8 = (UINT8*)Pointer32;
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} else {
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Pointer8 = (UINT8*)Buffer;
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}
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while (Length-- > 0) {
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*(Pointer8++) = Value;
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}
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return Buffer;
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}
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