diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-PagingGetRootForPAE32.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-PagingGetRootForPAE32.asm | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-PagingGetRootForPAE32.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-PagingGetRootForPAE32.asm new file mode 100644 index 00000000..9f48d3bd --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-PagingGetRootForPAE32.asm @@ -0,0 +1,127 @@ +; $Id: bs3-mode-PagingGetRootForPAE32.asm $ +;; @file +; BS3Kit - Bs3PagingGetRootForPAE32 +; + +; +; 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 +; + +%include "bs3kit-template-header.mac" + + +%ifdef TMPL_RM +extern TMPL_NM(Bs3SwitchToPE16) +extern NAME(Bs3SwitchToRM_pe16) +%elifdef TMPL_CMN_V86 +extern TMPL_NM(Bs3SwitchToRing0) +extern TMPL_NM(Bs3SwitchTo16BitV86) +%endif + +BS3_EXTERN_CMN Bs3PagingInitRootForPAE + +BS3_EXTERN_DATA16 g_PhysPagingRootPAE +TMPL_BEGIN_TEXT + + +;; +; @cproto BS3_DECL(uint32_t) Bs3PagingGetRootForPAE32(void) +; +; @returns eax +; +; @uses ax +; +; @remarks returns value in EAX, not dx:ax! +; +BS3_PROC_BEGIN_MODE Bs3PagingGetRootForPAE32, BS3_PBC_NEAR ; Internal function, no far variant necessary. + mov eax, [BS3_DATA16_WRT(g_PhysPagingRootPAE)] + cmp eax, 0ffffffffh + je .init_root + ret + +.init_root: + push xBP + mov xBP, xSP +BONLY16 push es + push sDX + push sCX + push sBX +%if TMPL_BITS == 64 + push r8 + push r9 + push r10 + push r11 +%endif + +%ifdef TMPL_RM + ; + ; We don't want to be restricted to real mode addressing, so + ; temporarily switch to 16-bit protected mode. + ; + call TMPL_NM(Bs3SwitchToPE16) + call Bs3PagingInitRootForPAE + call NAME(Bs3SwitchToRM_pe16) + +%elifdef TMPL_CMN_V86 + ; + ; V8086 mode uses real mode addressing too. Unlikly that we'll + ; ever end up here though. + ; + call TMPL_NM(Bs3SwitchToRing0) + call Bs3PagingInitRootForPAE + call TMPL_NM(Bs3SwitchTo16BitV86) +%else + ; + ; Not a problematic addressing mode. + ; +BONLY64 sub rsp, 20h + BS3_CALL Bs3PagingInitRootForPAE, 0 +BONLY64 add rsp, 20h +%endif + + ; + ; Load the value and return. + ; + mov eax, [BS3_DATA16_WRT(g_PhysPagingRootPAE)] + +%if TMPL_BITS == 64 + pop r11 + pop r10 + pop r9 + pop r8 +%endif + pop sBX + pop sCX + pop sDX +BONLY16 pop es + leave + ret +BS3_PROC_END_MODE Bs3PagingGetRootForPAE32 + |