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

[mirror_edk2.git] / OldMdePkg / Library / BaseMemoryLibMmx / X64 / ZeroMem.asm

diff --git a/OldMdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.asm b/OldMdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.asm
new file mode 100644 (file)
index 0000000..e9035a3
--- /dev/null
+++ b/OldMdePkg/Library/BaseMemoryLibMmx/X64/ZeroMem.asm
@@ -0,0 +1,54 @@
+;------------------------------------------------------------------------------\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
+;   ZeroMem.asm\r
+;\r
+; Abstract:\r
+;\r
+;   ZeroMem function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID *\r
+;  InternalMemZeroMem (\r
+;    IN VOID   *Buffer,\r
+;    IN UINTN  Count\r
+;    );\r
+;------------------------------------------------------------------------------\r
+InternalMemZeroMem  PROC    USES    rdi\r
+    mov     rdi, rcx\r
+    mov     rcx, rdx\r
+    mov     r8, rdi\r
+    and     edx, 7\r
+    shr     rcx, 3\r
+    jz      @ZeroBytes\r
+    DB      0fh, 0efh, 0c0h             ; pxor mm0, mm0\r
+@@:\r
+    DB      0fh, 0e7h, 7                ; movntq [rdi], mm0\r
+    add     rdi, 8\r
+    loop    @B\r
+    DB      0fh, 0aeh, 0f0h             ; mfence\r
+@ZeroBytes:\r
+    xor     eax, eax\r
+    mov     ecx, edx\r
+    rep     stosb\r
+    mov     rax, r8\r
+    ret\r
+InternalMemZeroMem  ENDP\r
+\r
+    END\r