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| author | Jordan Justen <jordan.l.justen@intel.com> | 2016-05-30 18:52:08 -0700 |
|---|---|---|
| committer | Liming Gao <liming.gao@intel.com> | 2016-06-28 09:50:56 +0800 |
| commit | 78a04284b203d3d90b692b8a6304dd23d5277d39 (patch) | |
| tree | 3c2b3aa5d4527aef284c22ea5a03ca5f0a9b8b76 /MdePkg/Library/BaseMemoryLibOptDxe | |
| parent | ff98bc66780d16dff9306a57b1135a15816e49ae (diff) | |
| download | edk2-78a04284b203d3d90b692b8a6304dd23d5277d39.tar.gz edk2-78a04284b203d3d90b692b8a6304dd23d5277d39.tar.bz2 edk2-78a04284b203d3d90b692b8a6304dd23d5277d39.zip | |
MdePkg BaseMemoryLibOptDxe: 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>
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibOptDxe')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf | 1 | ||||
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.nasm | 83 |
2 files changed, 84 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf b/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf index b5e750a7c8..e6370344c4 100644 --- a/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf +++ b/MdePkg/Library/BaseMemoryLibOptDxe/BaseMemoryLibOptDxe.inf @@ -122,6 +122,7 @@ X64/SetMem.nasm
X64/SetMem.asm
X64/SetMem.S
+ X64/CopyMem.nasm
X64/CopyMem.asm
X64/CopyMem.S
ScanMem64Wrapper.c
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.nasm new file mode 100644 index 0000000000..d312c2dfe4 --- /dev/null +++ b/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.nasm @@ -0,0 +1,83 @@ +;------------------------------------------------------------------------------
+;
+; 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 (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; );
+;------------------------------------------------------------------------------
+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 <- Last byte of Source
+ cmp rsi, rdi
+ mov rax, rdi ; rax <- Destination as return value
+ jae .0 ; Copy forward if Source > Destination
+ cmp r9, rdi ; Overlapped?
+ jae @CopyBackward ; Copy backward if overlapped
+.0:
+ xor rcx, rcx
+ sub rcx, rdi ; rcx <- -rdi
+ and rcx, 15 ; rcx + rsi should be 16 bytes aligned
+ jz .1 ; skip if rcx == 0
+ cmp rcx, r8
+ cmova rcx, r8
+ sub r8, rcx
+ rep movsb
+.1:
+ mov rcx, r8
+ and r8, 15
+ shr rcx, 4 ; rcx <- # of DQwords to copy
+ jz @CopyBytes
+ movdqa [rsp + 0x18], xmm0 ; save xmm0 on stack
+.2:
+ movdqu xmm0, [rsi] ; rsi may not be 16-byte aligned
+ movntdq [rdi], xmm0 ; rdi should be 16-byte aligned
+ add rsi, 16
+ add rdi, 16
+ loop .2
+ mfence
+ movdqa xmm0, [rsp + 0x18] ; restore xmm0
+ jmp @CopyBytes ; copy remaining bytes
+@CopyBackward:
+ mov rsi, r9 ; rsi <- Last byte of Source
+ lea rdi, [rdi + r8 - 1] ; rdi <- Last byte of Destination
+ std
+@CopyBytes:
+ mov rcx, r8
+ rep movsb
+ cld
+ pop rdi
+ pop rsi
+ ret
+
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