mirror of https://github.com/acidanthera/audk.git
153 lines
3.6 KiB
NASM
153 lines
3.6 KiB
NASM
;/*++
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;
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;Copyright (c) 2006, Intel Corporation
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;All rights reserved. This program and the accompanying materials
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;are licensed and made available under the terms and conditions of the BSD License
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;which accompanies this distribution. The full text of the license may be found at
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;http://opensource.org/licenses/bsd-license.php
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;
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;THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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;WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;Module Name:
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;
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; EfiSetMem.asm
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;
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;Abstract:
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;
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; This is the code that supports IA32-optimized SetMem service
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;
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;--*/
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;---------------------------------------------------------------------------
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.686
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.model flat,C
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.mmx
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.code
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;---------------------------------------------------------------------------
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;VOID
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;EfiCommonLibSetMem (
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; IN VOID *Buffer,
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; IN UINTN Count,
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; IN UINT8 Value
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; )
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;/*++
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;
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;Input: VOID *Buffer - Pointer to buffer to write
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; UINTN Count - Number of bytes to write
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; UINT8 Value - Value to write
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;
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;Output: None.
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;
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;Saves:
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;
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;Modifies:
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;
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;Description: This function is an optimized set-memory function.
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;
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;Notes: This function tries to set memory 8 bytes at a time. As a result,
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; it first picks up any misaligned bytes, then words, before getting
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; in the main loop that does the 8-byte clears.
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;
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;--*/
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EfiCommonLibSetMem PROC
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push ebp
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mov ebp, esp
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sub esp, 10h; Reserve space for local variable UINT64 QWordValue @[ebp - 10H] & UINT64 MmxSave @[ebp - 18H]
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push ebx
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push edi
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mov edx, [ebp + 0Ch] ; Count
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test edx, edx
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je _SetMemDone
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push ebx
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mov eax, [ebp + 8] ; Buffer
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mov bl, [ebp + 10h] ; Value
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mov edi, eax
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mov bh, bl
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cmp edx, 256
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jb _SetRemindingByte
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and al, 07h
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test al, al
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je _SetBlock
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mov eax, edi
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shr eax, 3
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inc eax
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shl eax, 3
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sub eax, edi
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cmp eax, edx
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jnb _SetRemindingByte
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sub edx, eax
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mov ecx, eax
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mov al, bl
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rep stosb
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_SetBlock:
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mov eax, edx
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shr eax, 6
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test eax, eax
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je _SetRemindingByte
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shl eax, 6
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sub edx, eax
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shr eax, 6
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mov WORD PTR [ebp - 10H], bx ; QWordValue[0]
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mov WORD PTR [ebp - 10H + 2], bx ; QWordValue[2]
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mov WORD PTR [ebp - 10H + 4], bx ; QWordValue[4]
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mov WORD PTR [ebp - 10H + 6], bx ; QWordValue[6]
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movq [ebp - 8], mm0 ; Save mm0 to MmxSave
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movq mm0, [ebp - 10H] ; Load QWordValue to mm0
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_B:
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movq QWORD PTR ds:[edi], mm0
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movq QWORD PTR ds:[edi+8], mm0
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movq QWORD PTR ds:[edi+16], mm0
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movq QWORD PTR ds:[edi+24], mm0
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movq QWORD PTR ds:[edi+32], mm0
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movq QWORD PTR ds:[edi+40], mm0
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movq QWORD PTR ds:[edi+48], mm0
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movq QWORD PTR ds:[edi+56], mm0
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add edi, 64
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dec eax
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jnz _B
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; Restore mm0
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movq mm0, [ebp - 8] ; Restore MmxSave to mm0
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emms ; Exit MMX Instruction
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_SetRemindingByte:
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mov ecx, edx
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mov eax, ebx
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shl eax, 16
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mov ax, bx
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shr ecx, 2
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rep stosd
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mov ecx, edx
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and ecx, 3
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rep stosb
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pop ebx
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_SetMemDone:
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pop edi
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pop ebx
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leave
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ret
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EfiCommonLibSetMem ENDP
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END
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