Add in the 1st version of ECP.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2832 6f19259b-4bc3-4df7-8a09-765794883524
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qwang12
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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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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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Module Name:
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EfiCopyMem.c
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Abstract:
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This is the code that supports IA32-optimized CopyMem service
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--*/
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#include "Tiano.h"
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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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Routine Description:
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Copy Length bytes from Source to Destination.
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Arguments:
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Destination - Target of copy
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Source - Place to copy from
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Length - Number of bytes to copy
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Returns:
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None
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--*/
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{
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UINT64 MmxSave;
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__asm {
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mov ecx, Count
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mov esi, Source
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mov edi, 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
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movq MmxSave, 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
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movq mm0, MmxSave
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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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}
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}
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