| 1 | ; $Id: bs3-cmn-MemZero.asm 106061 2024-09-16 14:03:52Z 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) 2007-2024 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; The contents of this file may alternatively be used under the terms
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| 26 | ; of the Common Development and Distribution License Version 1.0
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| 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | ; in the VirtualBox distribution, in which case the provisions of the
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| 29 | ; CDDL are applicable instead of those of the GPL.
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| 30 | ;
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| 31 | ; You may elect to license modified versions of this file under the
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| 32 | ; terms and conditions of either the GPL or the CDDL or both.
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| 33 | ;
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| 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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| 36 |
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| 37 | %include "bs3kit-template-header.mac"
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| 38 |
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| 39 | ;;
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| 40 | ; @cproto BS3_DECL(void) Bs3MemZero_c16(void BS3_FAR *pvDst, size_t cbDst);
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| 41 | ;
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| 42 | BS3_PROC_BEGIN_CMN Bs3MemZero, BS3_PBC_HYBRID
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| 43 | %ifdef RT_ARCH_AMD64
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| 44 | push rdi
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| 45 |
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| 46 | mov rdi, rcx ; rdi = pvDst
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| 47 | mov rcx, rdx ; rcx = cbDst
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| 48 | shr rcx, 3 ; calc qword count.
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| 49 | xor eax, eax ; rax = 0 (filler qword)
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| 50 | cld
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| 51 | rep stosq
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| 52 |
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| 53 | mov rcx, rdx ; cbDst
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| 54 | and rcx, 7 ; calc trailing byte count.
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| 55 | rep stosb
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| 56 |
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| 57 | pop rdi
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| 58 | BS3_HYBRID_RET
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| 59 |
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| 60 | %elif ARCH_BITS == 16
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| 61 | push bp
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| 62 | mov bp, sp
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| 63 | push di
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| 64 | push es
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| 65 |
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| 66 | mov di, [bp + 2 + cbCurRetAddr] ; pvDst.off
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| 67 | mov dx, [bp + 2 + cbCurRetAddr + 2] ; pvDst.sel
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| 68 | mov es, dx
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| 69 | mov cx, [bp + 2 + cbCurRetAddr + 4] ; cbDst
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| 70 | shr cx, 1 ; calc dword count.
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| 71 | xor ax, ax
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| 72 | rep stosw
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| 73 |
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| 74 | mov cx, [bp + 2 + cbCurRetAddr + 4] ; cbDst
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| 75 | and cx, 1 ; calc tailing byte count.
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| 76 | rep stosb
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| 77 |
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| 78 | pop es
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| 79 | pop di
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| 80 | pop bp
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| 81 | BS3_HYBRID_RET
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| 82 |
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| 83 | %elif ARCH_BITS == 32
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| 84 | push edi
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| 85 |
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| 86 | mov edi, [esp + 8] ; pvDst
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| 87 | mov ecx, [esp + 8 + 4] ; cbDst
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| 88 | shr cx, 2 ; calc dword count.
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| 89 | xor eax, eax
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| 90 | rep stosd
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| 91 |
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| 92 | mov ecx, [esp + 8 + 4] ; cbDst
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| 93 | and ecx, 3 ; calc tailing byte count.
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| 94 | rep stosb
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| 95 |
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| 96 | pop edi
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| 97 | BS3_HYBRID_RET
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| 98 |
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| 99 | %else
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| 100 | %error "Unknown bitness."
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| 101 | %endif
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| 102 | BS3_PROC_END_CMN Bs3MemZero
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| 103 |
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