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Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemZero.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemZero.asm | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemZero.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemZero.asm new file mode 100644 index 00000000..c5923c12 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemZero.asm @@ -0,0 +1,103 @@ +; $Id: bs3-cmn-MemZero.asm $ +;; @file +; BS3Kit - Bs3MemZero. +; + +; +; Copyright (C) 2007-2022 Oracle and/or its affiliates. +; +; This file is part of VirtualBox base platform packages, as +; available from https://www.virtualbox.org. +; +; This program is free software; you can redistribute it and/or +; modify it under the terms of the GNU General Public License +; as published by the Free Software Foundation, in version 3 of the +; License. +; +; This program is distributed in the hope that it will be useful, but +; WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +; General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this program; if not, see <https://www.gnu.org/licenses>. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included +; in the VirtualBox distribution, in which case the provisions of the +; CDDL are applicable instead of those of the GPL. +; +; You may elect to license modified versions of this file under the +; terms and conditions of either the GPL or the CDDL or both. +; +; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 +; + +%include "bs3kit-template-header.mac" + +;; +; @cproto BS3_DECL(void) Bs3MemZero_c16(void BS3_FAR *pvDst, size_t cbDst); +; +BS3_PROC_BEGIN_CMN Bs3MemZero, BS3_PBC_HYBRID +%ifdef RT_ARCH_AMD64 + push rdi + + mov rdi, rcx ; rdi = pvDst + mov rcx, rdx ; rcx = cbDst + shr rcx, 3 ; calc qword count. + xor eax, eax ; rax = 0 (filler qword) + cld + rep stosq + + mov rcx, rdx ; cbDst + and rcx, 7 ; calc trailing byte count. + rep stosb + + pop rdi + BS3_HYBRID_RET + +%elif ARCH_BITS == 16 + push bp + mov bp, sp + push di + push es + + mov di, [bp + 2 + cbCurRetAddr] ; pvDst.off + mov dx, [bp + 2 + cbCurRetAddr + 2] ; pvDst.sel + mov es, dx + mov cx, [bp + 2 + cbCurRetAddr + 4] ; cbDst + shr cx, 1 ; calc dword count. + xor ax, ax + rep stosw + + mov cx, [bp + 2 + cbCurRetAddr + 4] ; cbDst + and cx, 1 ; calc tailing byte count. + rep stosb + + pop es + pop di + pop bp + BS3_HYBRID_RET + +%elif ARCH_BITS == 32 + push edi + + mov edi, [esp + 8] ; pvDst + mov ecx, [esp + 8 + 4] ; cbDst + shr cx, 2 ; calc dword count. + xor eax, eax + rep stosd + + mov ecx, [esp + 8 + 4] ; cbDst + and ecx, 3 ; calc tailing byte count. + rep stosb + + pop edi + BS3_HYBRID_RET + +%else + %error "Unknown bitness." +%endif +BS3_PROC_END_CMN Bs3MemZero + |