Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseMemoryLibMmx / Ia32 / CopyMem.asm

diff --git a/OldMdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm b/OldMdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm
new file mode 100644 (file)
index 0000000..1b8b3c5
--- /dev/null
+++ b/OldMdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.asm
@@ -0,0 +1,77 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation\r
+; All rights reserved. This program and the accompanying materials\r
+; are licensed and made available under the terms and conditions of the BSD License\r
+; which accompanies this distribution.  The full text of the license may be found at\r
+; http://opensource.org/licenses/bsd-license.php\r
+;\r
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+; Module Name:\r
+;\r
+;   CopyMem.asm\r
+;\r
+; Abstract:\r
+;\r
+;   CopyMem function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .686\r
+    .model  flat,C\r
+    .mmx\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID *\r
+;  EFIAPI\r
+;  InternalMemCopyMem (\r
+;    IN VOID   *Destination,\r
+;    IN VOID   *Source,\r
+;    IN UINTN  Count\r
+;    );\r
+;------------------------------------------------------------------------------\r
+InternalMemCopyMem  PROC    USES    esi edi\r
+    mov     esi, [esp + 16]             ; esi <- Source\r
+    mov     edi, [esp + 12]             ; edi <- Destination\r
+    mov     edx, [esp + 20]             ; edx <- Count\r
+    lea     eax, [esi + edx - 1]        ; eax <- End of Source\r
+    cmp     esi, edi\r
+    jae     @F\r
+    cmp     eax, edi                    ; Overlapped?\r
+    jae     @CopyBackward               ; Copy backward if overlapped\r
+@@:\r
+    mov     ecx, edx\r
+    and     edx, 7\r
+    shr     ecx, 3                      ; ecx <- # of Qwords to copy\r
+    jz      @CopyBytes\r
+    push    eax\r
+    push    eax\r
+    movq    [esp], mm0                  ; save mm0\r
+@@:\r
+    movq    mm0, [esi]\r
+    movq    [edi], mm0\r
+    add     esi, 8\r
+    add     edi, 8\r
+    loop    @B\r
+    movq    mm0, [esp]                  ; restore mm0\r
+    pop     ecx                         ; stack cleanup\r
+    pop     ecx                         ; stack cleanup\r
+    jmp     @CopyBytes\r
+@CopyBackward:\r
+    mov     esi, eax                    ; esi <- Last byte in Source\r
+    lea     edi, [edi + edx - 1]        ; edi <- Last byte in Destination\r
+    std\r
+@CopyBytes:\r
+    mov     ecx, edx\r
+    rep     movsb\r
+    cld\r
+    mov     eax, [esp + 12]\r
+    ret\r
+InternalMemCopyMem  ENDP\r
+\r
+    END\r