1 files changed, 67 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.S b/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.S
new file mode 100644
index 0000000000..fe67040ff6
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibRepStr/x64/CopyMem.S
@@ -0,0 +1,67 @@
+#
+# ConvertAsm.py: Automatically generated from CopyMem.asm
+#
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006, Intel Corporation
+# All rights reserved. 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.S
+#
+# Abstract:
+#
+#   CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+#  VOID *
+#  EFIAPI
+#  InternalMemCopyMem (
+#    IN VOID   *Destination,
+#    IN VOID   *Source,
+#    IN UINTN  Count
+#    )
+#------------------------------------------------------------------------------
+.intel_syntax
+.globl _InternalMemCopyMem
+_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     _InternalMemCopyMem_al_0000
+    cmp     r9, rdi
+    jae     _atSym_CopyBackward               # Copy backward if overlapped
+_InternalMemCopyMem_al_0000:
+    mov     rcx, r8
+    and     r8, 7
+    shr     rcx, 3
+    rep     movsq                       # Copy as many Qwords as possible
+    jmp     _atSym_CopyBytes
+_atSym_CopyBackward:
+    mov     rsi, r9                     # rsi <- End of Source
+    lea     rdi, [rdi + r8 - 1]         # esi <- End of Destination
+    std                                 # set direction flag
+_atSym_CopyBytes:
+    mov     rcx, r8
+    rep     movsb                       # Copy bytes backward
+    cld
+    pop     rdi
+    pop     rsi
+    ret
+