diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibRepStr')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf | 2 | ||||
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.nasm | 65 |
2 files changed, 67 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf b/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf index e89d047235..9d7ce4b1fe 100644 --- a/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf +++ b/MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRepStr.inf @@ -112,6 +112,7 @@ X64/SetMem16.S
X64/SetMem.nasm
X64/SetMem.S
+ X64/CopyMem.nasm
X64/CopyMem.S
X64/ScanMem64.nasm
X64/ScanMem64.asm
@@ -133,6 +134,7 @@ X64/SetMem16.asm
X64/SetMem.nasm
X64/SetMem.asm
+ X64/CopyMem.nasm
X64/CopyMem.asm
[Packages]
diff --git a/MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.nasm b/MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.nasm new file mode 100644 index 0000000000..fb223ae7e8 --- /dev/null +++ b/MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.nasm @@ -0,0 +1,65 @@ +;------------------------------------------------------------------------------
+;
+; 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.Asm
+;
+; 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 <- End of Source
+ cmp rsi, rdi
+ mov rax, rdi ; rax <- Destination as return value
+ jae .0
+ cmp r9, rdi
+ jae @CopyBackward ; Copy backward if overlapped
+.0:
+ mov rcx, r8
+ and r8, 7
+ shr rcx, 3
+ rep movsq ; Copy as many Qwords as possible
+ jmp @CopyBytes
+@CopyBackward:
+ mov rsi, r9 ; rsi <- End of Source
+ lea rdi, [rdi + r8 - 1] ; esi <- End of Destination
+ std ; set direction flag
+@CopyBytes:
+ mov rcx, r8
+ rep movsb ; Copy bytes backward
+ cld
+ pop rdi
+ pop rsi
+ ret
+
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