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https://github.com/CloverHackyColor/CloverBootloader.git
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68 lines
2.0 KiB
NASM
68 lines
2.0 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; SetMem.nasm
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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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SECTION .text
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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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global ASM_PFX(InternalMemSetMem)
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ASM_PFX(InternalMemSetMem):
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push edi
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mov edx, [esp + 12] ; edx <- Count
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mov edi, [esp + 8] ; edi <- Buffer
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mov al, [esp + 16] ; al <- Value
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xor ecx, ecx
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sub ecx, edi
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and ecx, 15 ; ecx + edi aligns on 16-byte boundary
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jz .0
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cmp ecx, edx
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cmova ecx, edx
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sub edx, ecx
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rep stosb
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.0:
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mov ecx, edx
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and edx, 15
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shr ecx, 4 ; ecx <- # of DQwords to set
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jz @SetBytes
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mov ah, al ; ax <- Value | (Value << 8)
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add esp, -16
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movdqu [esp], xmm0 ; save xmm0
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movd xmm0, eax
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pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times
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movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times
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.1:
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movntdq [edi], xmm0 ; edi should be 16-byte aligned
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add edi, 16
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loop .1
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mfence
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movdqu xmm0, [esp] ; restore xmm0
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add esp, 16 ; stack cleanup
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@SetBytes:
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mov ecx, edx
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rep stosb
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mov eax, [esp + 8] ; eax <- Buffer as return value
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pop edi
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ret
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