1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2008, Intel Corporation. All rights reserved.<BR> 4 # This program and the accompanying materials 5 # are licensed and made available under the terms and conditions of the BSD License 6 # which accompanies this distribution. The full text of the license may be found at 7 # http://opensource.org/licenses/bsd-license.php 8 # 9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 # 12 # Module Name: 13 # 14 # EfiCopyMemRep1.S 15 # 16 # Abstract: 17 # 18 # CopyMem function 19 # 20 # Notes: 21 # 22 #------------------------------------------------------------------------------ 23 #include <EfiBind.h> 24 25 .code: 26 27 .globl ASM_PFX(EfiCommonLibCopyMem) 28 29 #------------------------------------------------------------------------------ 30 # VOID 31 # EfiCommonLibCopyMem ( 32 # OUT VOID *Destination, 33 # IN VOID *Source, 34 # IN UINTN Count 35 # ); 36 #------------------------------------------------------------------------------ 37 ASM_PFX(EfiCommonLibCopyMem): 38 push %rsi 39 push %rdi 40 cmp %rcx,%rdx 41 je CopyMemDone 42 cmp $0x0,%r8 43 je CopyMemDone 44 mov %rdx,%rsi 45 mov %rcx,%rdi 46 lea -1(%r8,%rsi,1),%r9 47 cmp %rdi,%rsi 48 jae CopyBytes 49 cmp %rdi,%r9 50 jb CopyBytes 51 mov %r9,%rsi 52 lea -1(%r8,%rdi,1),%rdi 53 std 54 55 CopyBytes: 56 mov %r8,%rcx 57 rep movsb %ds:(%rsi),%es:(%rdi) 58 cld 59 60 CopyMemDone: 61 pop %rdi 62 pop %rsi 63 retq 64 65 66 67
