| 1 | ; $Id: bs3-cmn-MemZero.asm 60366 2016-04-07 02:57:48Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3MemZero.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2015 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | %include "bs3kit-template-header.mac"
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| 28 |
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| 29 | ;;
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| 30 | ; @cproto BS3_DECL(void) Bs3MemZero_c16(void BS3_FAR *pvDst, size_t cbDst);
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| 31 | ;
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| 32 | BS3_PROC_BEGIN_CMN Bs3MemZero
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| 33 | %ifdef RT_ARCH_AMD64
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| 34 | push rdi
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| 35 |
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| 36 | mov rdi, rcx ; rdi = pvDst
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| 37 | mov rcx, rdx ; rcx = cbDst
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| 38 | shr rcx, 3 ; calc qword count.
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| 39 | xor eax, eax ; rax = 0 (filler qword)
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| 40 | cld
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| 41 | rep stosq
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| 42 |
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| 43 | mov rcx, rdx ; cbDst
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| 44 | and rcx, 7 ; calc trailing byte count.
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| 45 | rep stosb
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| 46 |
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| 47 | pop rdi
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| 48 | ret
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| 49 |
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| 50 | %elif ARCH_BITS == 16
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| 51 | push bp
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| 52 | mov bp, sp
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| 53 | push di
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| 54 | push es
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| 55 |
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| 56 | mov di, [bp + 4] ; pvDst.off
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| 57 | mov dx, [bp + 4 + 2] ; pvDst.sel
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| 58 | mov es, dx
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| 59 | mov cx, [bp + 4 + 4] ; cbDst
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| 60 | shr cx, 1 ; calc dword count.
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| 61 | xor ax, ax
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| 62 | rep stosw
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| 63 |
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| 64 | mov cx, [bp + 4 + 4] ; cbDst
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| 65 | and cx, 1 ; calc tailing byte count.
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| 66 | rep stosb
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| 67 |
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| 68 | pop es
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| 69 | pop di
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| 70 | pop bp
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| 71 | ret
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| 72 |
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| 73 | %elif ARCH_BITS == 32
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| 74 | push edi
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| 75 |
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| 76 | mov edi, [esp + 8] ; pvDst
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| 77 | mov ecx, [esp + 8 + 4] ; cbDst
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| 78 | shr cx, 2 ; calc dword count.
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| 79 | xor eax, eax
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| 80 | rep stosd
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| 81 |
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| 82 | mov ecx, [esp + 8 + 4] ; cbDst
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| 83 | and ecx, 3 ; calc tailing byte count.
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| 84 | rep stosb
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| 85 |
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| 86 | pop edi
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| 87 | ret
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| 88 |
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| 89 | %else
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| 90 | %error "Unknown bitness."
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| 91 | %endif
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| 92 | BS3_PROC_END_CMN Bs3MemZero
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| 93 |
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