diff options
Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ia32/CopyMem.asm')
-rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ia32/CopyMem.asm | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ia32/CopyMem.asm b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ia32/CopyMem.asm new file mode 100644 index 0000000..6f818f0 --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseMemoryLib/Ia32/CopyMem.asm @@ -0,0 +1,63 @@ +;------------------------------------------------------------------------------ +; +; Copyright (c) 2006, Intel Corporation +; All rights reserved. This program and the accompanying materials +; are licensed and made available under the terms and conditions of the BSD License +; which accompanies this distribution. The full text of the license may be found at +; http://opensource.org/licenses/bsd-license.php +; +; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +; +; Module Name: +; +; CopyMem.Asm +; +; Abstract: +; +; CopyMem function +; +; Notes: +; +;------------------------------------------------------------------------------ + + .386 + .model flat,C + .code + +;------------------------------------------------------------------------------ +; VOID * +; InternalMemCopyMem ( +; IN VOID *Destination, +; IN VOID *Source, +; IN UINTN Count +; ) +;------------------------------------------------------------------------------ +InternalMemCopyMem PROC USES esi edi + mov esi, [esp + 16] ; esi <- Source + mov edi, [esp + 12] ; edi <- Destination + mov edx, [esp + 20] ; edx <- Count + lea eax, [esi + edx - 1] ; eax <- End of Source + cmp esi, edi + jae @F + cmp eax, edi + jae @CopyBackward ; Copy backward if overlapped +@@: + mov ecx, edx + and edx, 3 + shr ecx, 2 + rep movsd ; Copy as many Dwords as possible + jmp @CopyBytes +@CopyBackward: + mov esi, eax ; esi <- End of Source + lea edi, [edi + edx - 1] ; edi <- End of Destination + std +@CopyBytes: + mov ecx, edx + rep movsb ; Copy bytes backward + cld + mov eax, [esp + 12] ; eax <- Destination as return value + ret +InternalMemCopyMem ENDP + + END |