VirtualBox

source: vbox/trunk/src/VBox/Devices/PC/BIOS/pmsetup.inc@ 104821

Last change on this file since 104821 was 98103, checked in by vboxsync, 22 months ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 1.8 KB
Line 
1; $Id: pmsetup.inc 98103 2023-01-17 14:15:46Z vboxsync $
2;; @file
3; Initial system setup which needs to run in protected mode.
4;
5
6;
7; Copyright (C) 2004-2023 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; SPDX-License-Identifier: GPL-3.0-only
26;
27
28SVR equ 0FEE000F0h
29LVT_LINT0 equ 0FEE00350h
30LVT_LINT1 equ 0FEE00360h
31
32public pmode_setup
33
34;; Enable the local APIC and program LINT0/LINT1 entries. Without that,
35;; virtual wire interrupts could not be delivered. Note that the APIC must
36;; be enabled first because when disabled, all LVTs are forced masked.
37
38pmode_setup proc near
39
40 .386
41 push eax
42 push esi
43 pushf
44 cli ; Interrupts would kill us!
45 call pmode_enter
46
47 mov eax, cr0 ; Clear CR0.CD and CR0.NW
48 and eax, 09FFFFFFFh
49 mov cr0, eax
50
51 mov esi, SVR ; Program the SVR -- enable the APIC,
52 mov eax, 010Fh ; set spurious interrupt vector to 15
53 mov [esi], eax
54
55 mov esi, LVT_LINT0 ; Program LINT0 to ExtINT and unmask
56 mov eax, [esi]
57 and eax, 0FFFE00FFh
58 or ah, 7
59 mov [esi], eax
60
61 mov esi, LVT_LINT1 ; Program LINT1 to NMI and unmask
62 mov eax, [esi]
63 and eax, 0FFFE00FFh
64 or ah, 4
65 mov [esi], eax
66
67 call pmode_exit
68 popf
69 pop esi
70 pop eax
71 SET_DEFAULT_CPU_286
72 ret
73
74pmode_setup endp
75
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