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authorWarner Losh <imp@FreeBSD.org>2017-03-07 20:53:26 +0000
committerWarner Losh <imp@FreeBSD.org>2017-03-07 20:53:26 +0000
commit0499b37cea9ca98acfe36368e521ad36b7783f2d (patch)
tree7968fdc8d6edf3e051bbd434a466eca88aacf938 /MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.nasm
downloadsrc-0499b37cea9ca98acfe36368e521ad36b7783f2d.tar.gz
src-0499b37cea9ca98acfe36368e521ad36b7783f2d.zip
Bring in snapshot of the MdePkg from Tianocore's EDK2 project at gitvendor/edk2/7babb4372e6a34cbbc54249b25056272a5a9924c
hash 7babb4372e6a34cbbc54249b25056272a5a9924c From 2017-Mar-03. EDK2 is Intel's BSD Licensed UEFI implementation. We'll be bringing in various routines from there rather than reimplementing them from scratch for libefivar and the EFI boot loader. The upstream repo has ^M ending on everything (sometimes multiple times!), so the following script was run prior to import so changes we have to do don't first include changing every line: % find . -type f | xargs -n 1 sed -I.BAK -e `printf "s/\r//g"` % find . -name \*.BAK | xargs rm Also, only the MdePkg was brought in (it's 17MB, while the entire repo is 250MB). It's almost completely certain nothing else will be used, but if it is, it can be brough in along side MdePkg in the future. Obtained from: https://github.com/tianocore/edk2.git
Notes
Notes: svn path=/vendor/edk2/; revision=314879 svn path=/vendor/edk2/7babb4372e6a34cbbc54249b25056272a5a9924c/; revision=314881; tag=vendor/edk2/7babb4372e6a34cbbc54249b25056272a5a9924c
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.nasm')
-rw-r--r--MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.nasm84
1 files changed, 84 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.nasm
new file mode 100644
index 000000000000..6913874d3055
--- /dev/null
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Ia32/CopyMem.nasm
@@ -0,0 +1,84 @@
+;------------------------------------------------------------------------------
+;
+; 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:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; InternalMemCopyMem (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+ push esi
+ push edi
+ mov esi, [esp + 16] ; esi <- Source
+ mov edi, [esp + 12] ; edi <- Destination
+ mov edx, [esp + 20] ; edx <- Count
+ lea eax, [esi + edx - 1] ; eax <- End of Source
+ cmp esi, edi
+ jae .0
+ cmp eax, edi ; Overlapped?
+ jae @CopyBackward ; Copy backward if overlapped
+.0:
+ xor ecx, ecx
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ jz .1
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx ; edx <- remaining bytes to copy
+ rep movsb
+.1:
+ mov ecx, edx
+ and edx, 15
+ shr ecx, 4 ; ecx <- # of DQwords to copy
+ jz @CopyBytes
+ add esp, -16
+ movdqu [esp], xmm0 ; save xmm0
+.2:
+ movdqu xmm0, [esi] ; esi may not be 16-bytes aligned
+ movntdq [edi], xmm0 ; edi should be 16-bytes aligned
+ add esi, 16
+ add edi, 16
+ loop .2
+ mfence
+ movdqu xmm0, [esp] ; restore xmm0
+ add esp, 16 ; stack cleanup
+ jmp @CopyBytes
+@CopyBackward:
+ mov esi, eax ; esi <- Last byte in Source
+ lea edi, [edi + edx - 1] ; edi <- Last byte in Destination
+ std
+@CopyBytes:
+ mov ecx, edx
+ rep movsb
+ cld
+ mov eax, [esp + 12] ; eax <- Destination as return value
+ pop edi
+ pop esi
+ ret
+