diff options
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf | 2 | ||||
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.nasm | 77 |
2 files changed, 79 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf index 27a324c448..3222ef89a8 100644 --- a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf +++ b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf @@ -70,6 +70,7 @@ Ia32/ZeroMem.S
Ia32/SetMem.nasm
Ia32/SetMem.S
+ Ia32/CopyMem.nasm
Ia32/CopyMem.S
Ia32/ScanMem64.nasm
Ia32/ScanMem64.asm
@@ -91,6 +92,7 @@ Ia32/ZeroMem.asm
Ia32/SetMem.nasm
Ia32/SetMem.asm
+ Ia32/CopyMem.nasm
Ia32/CopyMem.asm
[Sources.X64]
diff --git a/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.nasm new file mode 100644 index 0000000000..ae42df017e --- /dev/null +++ b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.nasm @@ -0,0 +1,77 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; 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.nasm
+;
+; Abstract:
+;
+; CopyMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemCopyMem (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+ push esi
+ push 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 .0
+ cmp eax, edi ; Overlapped?
+ jae @CopyBackward ; Copy backward if overlapped
+.0:
+ mov ecx, edx
+ and edx, 7
+ shr ecx, 3 ; ecx <- # of Qwords to copy
+ jz @CopyBytes
+ push eax
+ push eax
+ movq [esp], mm0 ; save mm0
+.1:
+ movq mm0, [esi]
+ movq [edi], mm0
+ add esi, 8
+ add edi, 8
+ loop .1
+ movq mm0, [esp] ; restore mm0
+ pop ecx ; stack cleanup
+ pop ecx ; stack cleanup
+ jmp @CopyBytes
+@CopyBackward:
+ mov esi, eax ; esi <- Last byte in Source
+ lea edi, [edi + edx - 1] ; edi <- Last byte in Destination
+ std
+@CopyBytes:
+ mov ecx, edx
+ rep movsb
+ cld
+ mov eax, [esp + 12]
+ pop edi
+ pop esi
+ ret
+
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