source: vbox/trunk/src/VBox/Devices/PC/BIOS/pmsetup.inc@ 47631

;; @file
;; Initial system setup which needs to run in protected mode.
;;

;;
;; Copyright (C) 2004-2011 Oracle Corporation
;;
;; This file is part of VirtualBox Open Source Edition (OSE), as
;; available from http://www.virtualbox.org. This file is free software;
;; you can redistribute it and/or modify it under the terms of the GNU
;; General Public License (GPL) as published by the Free Software
;; Foundation, in version 2 as it comes in the "COPYING" file of the
;; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
;; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;;

LVT0            equ     0FEE00350h
LVT1            equ     0FEE00360h

public          pmode_setup

;; Program LVT0/LVT1 entries in the local APIC. Some Linux kernels (e.g., RHEL4
;; SMP 32-bit) expect the entries to be unmasked in virtual wire mode.

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, LVT0       ; Program LVT0 to ExtINT and unmask
                mov     eax, [esi]
                and     eax, 0FFFE00FFh
                or      ah,  7
                mov     [esi], eax
                mov     esi, LVT1       ; Program LVT1 to NMI and unmask
                mov     eax, [esi]
                and     eax, 0FFFE00FFh
                or      ah,  4
                mov     [esi], eax
                call    pmode_exit
                popf
                pop     esi
                pop     eax
                .286
                ret

pmode_setup     endp