mirror of https://github.com/acidanthera/audk.git
59 lines
1.8 KiB
ArmAsm
59 lines
1.8 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006, Intel Corporation
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# All rights reserved. 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.Asm
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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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.intel_syntax noprefix
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.globl ASM_PFX(InternalMemSetMem)
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ASM_PFX(InternalMemZeroMem):
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push rdi
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push rbx
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push rcx # push Buffer
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mov rax, r8 # rax = Value
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and rax, 0xff # rax = lower 8 bits of r8, upper 56 bits are 0
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mov ah, al # ah = al
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mov bx, ax # bx = ax
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shl rax, 0x10 # rax = ax << 16
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mov ax, bx # ax = bx
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mov rbx, rax # ebx = eax
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shl rax, 0x20 # rax = rax << 32
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or rax, rbx # eax = ebx
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mov rdi, rcx # rdi = Buffer
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mov rcx, rdx # rcx = Count
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shr rcx, 3 # rcx = rcx / 8
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cld
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rep stosq
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mov rcx, rdx # rcx = rdx
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and rcx, 7 # rcx = rcx & 7
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rep stosb
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pop rax # rax = Buffer
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pop rbx
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pop rdi
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ret
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