diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memset.asm')
-rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memset.asm | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memset.asm b/EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memset.asm new file mode 100644 index 0000000000..3dbf920da8 --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/CompilerStub/Ia32/memset.asm @@ -0,0 +1,72 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2007, 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:
+;
+; SetMem.asm
+;
+; Abstract:
+;
+; memset function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ .686
+ .model flat,C
+ .mmx
+ .code
+
+;------------------------------------------------------------------------------
+; VOID *
+; memset (
+; OUT VOID *Buffer,
+; IN UINT8 Value,
+; IN UINTN Count
+; )
+;------------------------------------------------------------------------------
+memset PROC USES edi
+ mov al, [esp + 12]
+ mov ah, al
+ shrd edx, eax, 16
+ shld eax, edx, 16
+ mov ecx, [esp + 16] ; ecx <- Count
+ cmp ecx, 0 ; if Count == 0, do nothing
+ je @SetDone
+ mov edi, [esp + 8] ; edi <- Buffer
+ mov edx, ecx
+ and edx, 7
+ shr ecx, 3 ; # of Qwords to set
+ jz @SetBytes
+ add esp, -10h
+ movq [esp], mm0 ; save mm0
+ movq [esp + 8], mm1 ; save mm1
+ movd mm0, eax
+ movd mm1, eax
+ psllq mm0, 32
+ por mm0, mm1 ; fill mm0 with 8 Value's
+@@:
+ movq [edi], mm0
+ add edi, 8
+ loop @B
+ movq mm0, [esp] ; restore mm0
+ movq mm1, [esp + 8] ; restore mm1
+ add esp, 10h ; stack cleanup
+@SetBytes:
+ mov ecx, edx
+ rep stosb
+@SetDone:
+ mov eax, [esp + 8] ; eax <- Buffer as return value
+ ret
+memset ENDP
+
+ END
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