Inline ASM in .c file is specific to MS tool-chain. Other tool-chain (such as Intel compiler) may not support it. Add in .asm files to make these function to be built by Assembler so that they are avaliable too for other tool-chain.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5529 6f19259b-4bc3-4df7-8a09-765794883524
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qwang12
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;/*++
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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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; EfiCopyMem.c
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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 CopyMem 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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;EfiCommonLibCopyMem (
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; IN VOID *Destination,
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; IN VOID *Source,
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; IN UINTN Count
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; )
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;/*++
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;
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;Routine Description:
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;
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; Copy Length bytes from Source to Destination.
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;
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;Arguments:
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;
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; Destination - Target of copy
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;
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; Source - Place to copy from
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;
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; Length - Number of bytes to copy
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;
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;Returns:
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;
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; None
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;
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;--*/
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EfiCommonLibCopyMem PROC
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push ebp
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mov ebp, esp
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push ecx ; reserve space for Scratch Local variable UINT64 MmxSave
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push ecx
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push esi
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push edi
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mov ecx, [ebp + 10h] ; Count
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mov esi, [ebp + 0Ch] ; Source
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mov edi, [ebp + 8] ; Destination
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; First off, make sure we have no overlap. That is to say,
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; if (Source == Destination) => do nothing
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; if (Source + Count <= Destination) => regular copy
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; if (Destination + Count <= Source) => regular copy
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; otherwise, do a reverse copy
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mov eax, esi
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add eax, ecx ; Source + Count
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cmp eax, edi
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jle _StartByteCopy
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mov eax, edi
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add eax, ecx ; Dest + Count
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cmp eax, esi
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jle _StartByteCopy
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cmp esi, edi
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je _CopyMemDone
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jl _CopyOverlapped ; too bad -- overlaps
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; Pick up misaligned start bytes to get destination pointer 4-byte aligned
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_StartByteCopy:
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cmp ecx, 0
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je _CopyMemDone ; Count == 0, all done
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mov edx, edi
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and dl, 3 ; check lower 2 bits of address
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test dl, dl
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je SHORT _CopyBlocks ; already aligned?
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; Copy a byte
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mov al, BYTE PTR [esi] ; get byte from Source
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mov BYTE PTR [edi], al ; write byte to Destination
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dec ecx
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inc edi
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inc esi
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jmp _StartByteCopy ; back to top of loop
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_CopyBlocks:
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; Compute how many 64-byte blocks we can clear
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mov eax, ecx ; get Count in eax
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shr eax, 6 ; convert to 64-byte count
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shl eax, 6 ; convert back to bytes
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sub ecx, eax ; subtract from the original count
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shr eax, 6 ; and this is how many 64-byte blocks
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; If no 64-byte blocks, then skip
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cmp eax, 0
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je _CopyRemainingDWords
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; Save mm0 to UINT64 MmxSave
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movq [ebp - 8], mm0
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copymmx:
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movq mm0, QWORD PTR ds:[esi]
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movq QWORD PTR ds:[edi], mm0
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movq mm0, QWORD PTR ds:[esi+8]
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movq QWORD PTR ds:[edi+8], mm0
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movq mm0, QWORD PTR ds:[esi+16]
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movq QWORD PTR ds:[edi+16], mm0
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movq mm0, QWORD PTR ds:[esi+24]
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movq QWORD PTR ds:[edi+24], mm0
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movq mm0, QWORD PTR ds:[esi+32]
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movq QWORD PTR ds:[edi+32], mm0
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movq mm0, QWORD PTR ds:[esi+40]
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movq QWORD PTR ds:[edi+40], mm0
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movq mm0, QWORD PTR ds:[esi+48]
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movq QWORD PTR ds:[edi+48], mm0
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movq mm0, QWORD PTR ds:[esi+56]
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movq QWORD PTR ds:[edi+56], mm0
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add edi, 64
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add esi, 64
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dec eax
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jnz copymmx
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; Restore mm0 from MmxSave
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movq mm0, [ebp - 8]
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emms ; Exit MMX Instruction
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; Copy as many DWORDS as possible
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_CopyRemainingDWords:
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cmp ecx, 4
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jb _CopyRemainingBytes
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mov eax, DWORD PTR [esi] ; get data from Source
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mov DWORD PTR [edi], eax ; write byte to Destination
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sub ecx, 4 ; decrement Count
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add esi, 4 ; advance Source pointer
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add edi, 4 ; advance Destination pointer
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jmp _CopyRemainingDWords ; back to top
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_CopyRemainingBytes:
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cmp ecx, 0
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je _CopyMemDone
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mov al, BYTE PTR [esi] ; get byte from Source
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mov BYTE PTR [edi], al ; write byte to Destination
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dec ecx
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inc esi
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inc edi ; advance Destination pointer
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jmp SHORT _CopyRemainingBytes ; back to top of loop
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;
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; We do this block if the source and destination buffers overlap. To
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; handle it, copy starting at the end of the source buffer and work
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; your way back. Since this is the atypical case, this code has not
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; been optimized, and thus simply copies bytes.
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;
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_CopyOverlapped:
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; Move the source and destination pointers to the end of the range
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add esi, ecx ; Source + Count
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dec esi
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add edi, ecx ; Dest + Count
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dec edi
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_CopyOverlappedLoop:
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cmp ecx, 0
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je _CopyMemDone
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mov al, BYTE PTR [esi] ; get byte from Source
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mov BYTE PTR [edi], al ; write byte to Destination
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dec ecx
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dec esi
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dec edi
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jmp _CopyOverlappedLoop ; back to top of loop
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_CopyMemDone:
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pop edi
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pop esi
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leave
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ret
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EfiCommonLibCopyMem ENDP
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END
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