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; $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
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