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author | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-06-20 21:50:44 +0000 |
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committer | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-06-20 21:50:44 +0000 |
commit | 975201130c7223ef29be7a28500ed107623fc4be (patch) | |
tree | 1ee2dacc73b6285d5371cf34e8100e831d971695 /MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S | |
parent | 11e7b0f6dd28d03942494d3e18842d31421a9842 (diff) | |
download | edk2-platforms-975201130c7223ef29be7a28500ed107623fc4be.tar.xz |
Use capital S for GCC assembly. This enables pre-processing for PCD support.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@576 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S')
-rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S new file mode 100644 index 0000000000..56788cb981 --- /dev/null +++ b/MdePkg/Library/BaseMemoryLibMmx/Ia32/CopyMem.S @@ -0,0 +1,90 @@ +#------------------------------------------------------------------------------ +# +# 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.asm +# +# Abstract: +# +# CopyMem function +# +# Notes: +# +#------------------------------------------------------------------------------ + + .686: + #.MODEL flat,C + .xmm: + .code: + +#------------------------------------------------------------------------------ +# VOID * +# _mem_CopyMem ( +# IN VOID *Destination, +# IN VOID *Source, +# IN UINTN Count +# ) +#------------------------------------------------------------------------------ +.global _InternalMemCopyMem +_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(%edi,%edx,), %eax # eax <- End of Destination + cmpl %edi, %esi + jae L0 + cmpl %esi, %eax # Overlapped? + jae @CopyBackward # Copy backward if overlapped +L0: + xorl %ecx, %ecx + subl %esi, %ecx + andl $7, %ecx # ecx + esi aligns on 8-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 $7, %edx + shrl $3, %ecx # ecx <- # of Qwords to copy + jz @CopyBytes + pushl %eax + pushl %eax + movq %mm0, (%esp) # save mm0 +L2: + movq (%esi), %mm0 + movntq %mm0, (%edi) + addl $8, %esi + addl $8, %edi + loop L2 + mfence + movq (%esp), %mm0 # restore mm0 + popl %ecx # stack cleanup + popl %ecx # stack cleanup + jmp @CopyBytes +@CopyBackward: + movl %eax, %edi # edi <- Last byte in Destination + leal -1(%esi,%edx,), %esi # esi <- Last byte in Source + std +@CopyBytes: + movl %edx, %ecx + rep + movsb + cld + movl 12(%esp), %eax + push %esi + push %edi + ret |