1 files changed, 75 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.asm b/Core/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.asm
new file mode 100644
index 0000000000..369cc00b63
--- /dev/null
+++ b/Core/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.asm
@@ -0,0 +1,75 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   SetMem.asm
+;
+; Abstract:
+;
+;   SetMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .686
+    .model  flat,C
+    .xmm
+    .code
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  EFIAPI
+;  InternalMemSetMem (
+;    IN VOID   *Buffer,
+;    IN UINTN  Count,
+;    IN UINT8  Value
+;    );
+;------------------------------------------------------------------------------
+InternalMemSetMem   PROC    USES    edi
+    mov     edx, [esp + 12]             ; edx <- Count
+    mov     edi, [esp + 8]              ; edi <- Buffer
+    mov     al, [esp + 16]              ; al <- Value
+    xor     ecx, ecx
+    sub     ecx, edi
+    and     ecx, 15                     ; ecx + edi aligns on 16-byte boundary
+    jz      @F
+    cmp     ecx, edx
+    cmova   ecx, edx
+    sub     edx, ecx
+    rep     stosb
+@@:
+    mov     ecx, edx
+    and     edx, 15
+    shr     ecx, 4                      ; ecx <- # of DQwords to set
+    jz      @SetBytes
+    mov     ah, al                      ; ax <- Value | (Value << 8)
+    add     esp, -16
+    movdqu  [esp], xmm0                 ; save xmm0
+    movd    xmm0, eax
+    pshuflw xmm0, xmm0, 0               ; xmm0[0..63] <- Value repeats 8 times
+    movlhps xmm0, xmm0                  ; xmm0 <- Value repeats 16 times
+@@:
+    movntdq [edi], xmm0                 ; edi should be 16-byte aligned
+    add     edi, 16
+    loop    @B
+    mfence
+    movdqu  xmm0, [esp]                 ; restore xmm0
+    add     esp, 16                     ; stack cleanup
+@SetBytes:
+    mov     ecx, edx
+    rep     stosb
+    mov     eax, [esp + 8]              ; eax <- Buffer as return value
+    ret
+InternalMemSetMem   ENDP
+
+    END