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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Devices/PC/BIOS/pmsetup.inc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/VBox/Devices/PC/BIOS/pmsetup.inc b/src/VBox/Devices/PC/BIOS/pmsetup.inc new file mode 100644 index 00000000..a6ba8c44 --- /dev/null +++ b/src/VBox/Devices/PC/BIOS/pmsetup.inc @@ -0,0 +1,75 @@ +; $Id: pmsetup.inc $ +;; @file +; Initial system setup which needs to run in protected mode. +; + +; +; Copyright (C) 2004-2023 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>. +; +; SPDX-License-Identifier: GPL-3.0-only +; + +SVR equ 0FEE000F0h +LVT_LINT0 equ 0FEE00350h +LVT_LINT1 equ 0FEE00360h + +public pmode_setup + +;; Enable the local APIC and program LINT0/LINT1 entries. Without that, +;; virtual wire interrupts could not be delivered. Note that the APIC must +;; be enabled first because when disabled, all LVTs are forced masked. + +pmode_setup proc near + + .386 + push eax + push esi + pushf + cli ; Interrupts would kill us! + call pmode_enter + + mov eax, cr0 ; Clear CR0.CD and CR0.NW + and eax, 09FFFFFFFh + mov cr0, eax + + mov esi, SVR ; Program the SVR -- enable the APIC, + mov eax, 010Fh ; set spurious interrupt vector to 15 + mov [esi], eax + + mov esi, LVT_LINT0 ; Program LINT0 to ExtINT and unmask + mov eax, [esi] + and eax, 0FFFE00FFh + or ah, 7 + mov [esi], eax + + mov esi, LVT_LINT1 ; Program LINT1 to NMI and unmask + mov eax, [esi] + and eax, 0FFFE00FFh + or ah, 4 + mov [esi], eax + + call pmode_exit + popf + pop esi + pop eax + SET_DEFAULT_CPU_286 + ret + +pmode_setup endp + |