Change name.

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibOptDxe / X64 / SetMem.asm

diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.asm b/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.asm
new file mode 100644 (file)
index 0000000..c94b6b5
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.asm
@@ -0,0 +1,58 @@
+;------------------------------------------------------------------------------\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
+;   SetMem.Asm\r
+;\r
+; Abstract:\r
+;\r
+;   SetMem function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+;  VOID *\r
+;  EFIAPI\r
+;  InternalMemSetMem (\r
+;    IN VOID   *Buffer,\r
+;    IN UINTN  Count,\r
+;    IN UINT8  Value\r
+;    )\r
+;------------------------------------------------------------------------------\r
+InternalMemSetMem   PROC    USES    rdi rbx\r
+    push    rcx       ; push Buffer\r
+    mov     rax, r8   ; rax = Value\r
+    and     rax, 0ffh ; rax = lower 8 bits of r8, upper 56 bits are 0\r
+    mov     ah,  al   ; ah  = al\r
+    mov     bx,  ax   ; bx  = ax\r
+    shl     rax, 10h  ; rax = ax << 16\r
+    mov     ax,  bx   ; ax  = bx\r
+    mov     rbx, rax  ; ebx = eax\r
+    shl     rax, 20h  ; rax = rax << 32\r
+    or      rax, rbx  ; eax = ebx\r
+    mov     rdi, rcx  ; rdi = Buffer\r
+    mov     rcx, rdx  ; rcx = Count\r
+    shr     rcx, 3    ; rcx = rcx / 8\r
+    cld\r
+    rep     stosq      \r
+    mov     rcx, rdx  ; rcx = rdx\r
+    and     rcx, 7    ; rcx = rcx & 7\r
+    rep     stosb      \r
+    pop     rax       ; rax = Buffer\r
+    ret\r
+InternalMemSetMem   ENDP\r
+\r
+    END\r