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58 lines
1.8 KiB
58 lines
1.8 KiB
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# SetMem.S
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#
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# Abstract:
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#
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# SetMem function
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# VOID *
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# EFIAPI
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# InternalMemSetMem (
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# IN VOID *Buffer,
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# IN UINTN Count,
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# IN UINT8 Value
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# )
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(InternalMemSetMem)
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ASM_PFX(InternalMemSetMem):
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pushq %rdi
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pushq %rbx
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pushq %rcx # push Buffer
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movq %r8, %rax # rax = Value
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andq $0xff, %rax # rax = lower 8 bits of r8, upper 56 bits are 0
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movb %al, %ah # ah = al
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movw %ax, %bx # bx = ax
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shlq $0x10, %rax # rax = ax << 16
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movw %bx, %ax # ax = bx
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movq %rax, %rbx # ebx = eax
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shlq $0x20, %rax # rax = rax << 32
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orq %rbx, %rax # eax = ebx
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movq %rcx, %rdi # rdi = Buffer
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movq %rdx, %rcx # rcx = Count
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shrq $3, %rcx # rcx = rcx / 8
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cld
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rep stosq
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movq %rdx, %rcx # rcx = rdx
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andq $7, %rcx # rcx = rcx & 7
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rep stosb
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popq %rax # rax = Buffer
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popq %rbx
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popq %rdi
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ret
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