diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelRealModeDataToFlat.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelRealModeDataToFlat.asm | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelRealModeDataToFlat.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelRealModeDataToFlat.asm new file mode 100644 index 00000000..0f0f0408 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SelRealModeDataToFlat.asm @@ -0,0 +1,101 @@ +; $Id: bs3-cmn-SelRealModeDataToFlat.asm $ +;; @file +; BS3Kit - Bs3SelRealModeDataToFlat. +; + +; +; Copyright (C) 2007-2023 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 +; + + +;********************************************************************************************************************************* +;* Header Files * +;********************************************************************************************************************************* +%include "bs3kit-template-header.mac" + + +;********************************************************************************************************************************* +;* External Symbols * +;********************************************************************************************************************************* +TMPL_BEGIN_TEXT +%if TMPL_BITS == 16 +CPU 8086 +%endif + + +;; +; @cproto BS3_CMN_PROTO_NOSB(uint32_t, Bs3SelRealModeDataToFlat,(uint32_t uFar1616)); +; @cproto BS3_CMN_PROTO_NOSB(uint32_t, Bs3SelRealModeCodeToFlat,(uint32_t uFar1616)); +; +; @uses Only return registers (ax:dx, eax, eax); +; @remarks No 20h scratch area requirements. +; +BS3_PROC_BEGIN_CMN Bs3SelRealModeCodeToFlat, BS3_PBC_NEAR ; Far stub generated by the makefile/bs3kit.h. +BS3_PROC_BEGIN_CMN Bs3SelRealModeDataToFlat, BS3_PBC_NEAR ; Far stub generated by the makefile/bs3kit.h. + push xBP + mov xBP, xSP + + ; Calc flat address. +%if TMPL_BITS == 16 + push cx + mov dx, [xBP + xCB + cbCurRetAddr + 2] + mov ax, dx + mov cl, 12 + shr dx, cl + mov cl, 4 + shl ax, cl + add ax, [xBP + xCB + cbCurRetAddr] + adc dx, 0 + pop cx + +%elif TMPL_BITS == 32 + movzx eax, word [xBP + xCB + cbCurRetAddr + 2] + shl eax, 4 + add ax, [xBP + xCB + cbCurRetAddr] + jnc .return + add eax, 10000h + +%elif TMPL_BITS == 64 + mov eax, ecx + shr eax, 16 + shl eax, 4 + add ax, cx + jnc .return + add eax, 10000h + +%else + %error "TMPL_BITS!" +%endif + +.return: + pop xBP + BS3_HYBRID_RET +BS3_PROC_END_CMN Bs3SelRealModeDataToFlat + |