From eadcb0a18f05b30c750d579b0103209d87a50a58 Mon Sep 17 00:00:00 2001
From: Jordan Justen <jordan.l.justen@intel.com>
Date: Mon, 30 May 2016 18:52:07 -0700
Subject: [PATCH] MdePkg BaseMemoryLibMmx: Convert X64/CopyMem.asm to NASM

The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/CopyMem.asm to X64/CopyMem.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
---
 .../BaseMemoryLibMmx/BaseMemoryLibMmx.inf     |  2 +
 .../Library/BaseMemoryLibMmx/X64/CopyMem.nasm | 74 +++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm

diff --git a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
index a3bb2b6ca2..a609073fc4 100644
--- a/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
+++ b/MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf
@@ -116,6 +116,7 @@
   X64/SetMem16.asm
   X64/SetMem.nasm
   X64/SetMem.asm
+  X64/CopyMem.nasm
   X64/CopyMem.asm
   X64/ScanMem64.nasm
   X64/ScanMem64.S
@@ -137,6 +138,7 @@
   X64/ZeroMem.S
   X64/SetMem.nasm
   X64/SetMem.S
+  X64/CopyMem.nasm
   X64/CopyMem.S
 
 
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm
new file mode 100644
index 0000000000..5be37f93c8
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibMmx/X64/CopyMem.nasm
@@ -0,0 +1,74 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;   CopyMem.nasm
+;
+; Abstract:
+;
+;   CopyMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemCopyMem (
+;   OUT     VOID                      *DestinationBuffer,
+;   IN      CONST VOID                *SourceBuffer,
+;   IN      UINTN                     Length
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+    push    rsi
+    push    rdi
+    mov     rsi, rdx                    ; rsi <- Source
+    mov     rdi, rcx                    ; rdi <- Destination
+    lea     r9, [rsi + r8 - 1]          ; r9 <- End of Source
+    cmp     rsi, rdi
+    mov     rax, rdi                    ; rax <- Destination as return value
+    jae     .0
+    cmp     r9, rdi
+    jae     @CopyBackward               ; Copy backward if overlapped
+.0:
+    mov     rcx, r8
+    and     r8, 7
+    shr     rcx, 3                      ; rcx <- # of Qwords to copy
+    jz      @CopyBytes
+    DB      0x49, 0xf, 0x7e, 0xc2         ; movd r10, mm0 (Save mm0 in r10)
+.1:
+    DB      0xf, 0x6f, 0x6               ; movd mm0, [rsi]
+    DB      0xf, 0xe7, 0x7              ; movntq [rdi], mm0
+    add     rsi, 8
+    add     rdi, 8
+    loop    .1
+    mfence
+    DB      0x49, 0xf, 0x6e, 0xc2         ; movd mm0, r10 (Restore mm0)
+    jmp     @CopyBytes
+@CopyBackward:
+    mov     rsi, r9                     ; rsi <- End of Source
+    lea     rdi, [rdi + r8 - 1]         ; rdi <- End of Destination
+    std                                 ; set direction flag
+@CopyBytes:
+    mov     rcx, r8
+    rep     movsb                       ; Copy bytes backward
+    cld
+    pop     rdi
+    pop     rsi
+    ret
+