diff options
Diffstat (limited to 'OldMdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.S')
-rw-r--r-- | OldMdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.S b/OldMdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.S new file mode 100644 index 0000000000..8b4157f741 --- /dev/null +++ b/OldMdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.S @@ -0,0 +1,65 @@ +#------------------------------------------------------------------------------ +# +# Copyright (c) 2006, Intel Corporation +# All rights reserved. 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: +# +# ZeroMem.asm +# +# Abstract: +# +# ZeroMem function +# +# Notes: +# +#------------------------------------------------------------------------------ + +.globl _InternalMemZeroMem + +#------------------------------------------------------------------------------ +# VOID * +# EFIAPI +# InternalMemZeroMem ( +# IN VOID *Buffer, +# IN UINTN Count +# ); +#------------------------------------------------------------------------------ +_InternalMemZeroMem: + push %edi + movl 8(%esp), %edi + movl 12(%esp), %edx + xorl %ecx, %ecx + subl %edi, %ecx + xorl %eax, %eax + andl $15, %ecx + jz L0 + cmpl %edx, %ecx + cmova %edx, %ecx + subl %ecx, %edx + rep + stosb +L0: + movl %edx, %ecx + andl $15, %edx + shrl $4, %ecx + jz L_ZeroBytes + pxor %xmm0, %xmm0 +L1: + movntdq %xmm0, (%edi) + addl $16, %edi + loop L1 + mfence +L_ZeroBytes: + movl %edx, %ecx + rep + stosb + movl 8(%esp), %eax + pop %edi + ret |