diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
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committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.S | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.S')
-rw-r--r-- | Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.S b/Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.S new file mode 100644 index 0000000000..bfc02d6319 --- /dev/null +++ b/Core/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.S @@ -0,0 +1,85 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, 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.S
+#
+# Abstract:
+#
+# CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
+
+#------------------------------------------------------------------------------
+# VOID *
+# EFIAPI
+# InternalMemCopyMem (
+# IN VOID *Destination,
+# IN VOID *Source,
+# IN UINTN Count
+# );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMemCopyMem):
+ push %esi
+ push %edi
+ movl 16(%esp), %esi # esi <- Source
+ movl 12(%esp), %edi # edi <- Destination
+ movl 20(%esp), %edx # edx <- Count
+ leal -1(%esi,%edx,), %eax # eax <- End of Source
+ cmpl %edi, %esi
+ jae L0
+ cmpl %edi, %eax # Overlapped?
+ jae L_CopyBackward # Copy backward if overlapped
+L0:
+ xorl %ecx, %ecx
+ subl %edi, %ecx
+ andl $15, %ecx # ecx + edi aligns on 16-byte boundary
+ jz L1
+ cmpl %edx, %ecx
+ cmova %edx, %ecx
+ subl %ecx, %edx # edx <- remaining bytes to copy
+ rep
+ movsb
+L1:
+ movl %edx, %ecx
+ andl $15, %edx
+ shrl $4, %ecx # ecx <- # of DQwords to copy
+ jz L_CopyBytes
+ addl $-16, %esp
+ movdqu %xmm0, (%esp)
+L2:
+ movdqu (%esi), %xmm0
+ movntdq %xmm0, (%edi)
+ addl $16, %esi
+ addl $16, %edi
+ loop L2
+ mfence
+ movdqu (%esp),%xmm0
+ addl $16, %esp # stack cleanup
+ jmp L_CopyBytes
+L_CopyBackward:
+ movl %eax, %esi # esi <- Last byte in Source
+ leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination
+ std
+L_CopyBytes:
+ movl %edx, %ecx
+ rep
+ movsb
+ cld
+ movl 12(%esp), %eax # eax <- Destination as return value
+ pop %edi
+ pop %esi
+ ret
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