1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2006 - 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 # ZeroMem.asm 15 # 16 # Abstract: 17 # 18 # ZeroMem function 19 # 20 # Notes: 21 # 22 #------------------------------------------------------------------------------ 23 24 ASM_GLOBAL ASM_PFX(InternalMemZeroMem) 25 26 #------------------------------------------------------------------------------ 27 # VOID * 28 # EFIAPI 29 # InternalMemZeroMem ( 30 # IN VOID *Buffer, 31 # IN UINTN Count 32 # ); 33 #------------------------------------------------------------------------------ 34 ASM_PFX(InternalMemZeroMem): 35 push %edi 36 movl 8(%esp), %edi 37 movl 12(%esp), %edx 38 xorl %ecx, %ecx 39 subl %edi, %ecx 40 xorl %eax, %eax 41 andl $15, %ecx 42 jz L0 43 cmpl %edx, %ecx 44 cmova %edx, %ecx 45 subl %ecx, %edx 46 rep 47 stosb 48 L0: 49 movl %edx, %ecx 50 andl $15, %edx 51 shrl $4, %ecx 52 jz L_ZeroBytes 53 pxor %xmm0, %xmm0 54 L1: 55 movntdq %xmm0, (%edi) 56 addl $16, %edi 57 loop L1 58 mfence 59 L_ZeroBytes: 60 movl %edx, %ecx 61 rep 62 stosb 63 movl 8(%esp), %eax 64 pop %edi 65 ret 66
