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| 1 | ; $Id: pmsetup.inc 93115 2022-01-01 11:31:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; Initial system setup which needs to run in protected mode.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2004-2022 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 |
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| 18 | SVR equ 0FEE000F0h
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| 19 | LVT_LINT0 equ 0FEE00350h
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| 20 | LVT_LINT1 equ 0FEE00360h
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| 21 |
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| 22 | public pmode_setup
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| 23 |
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| 24 | ;; Enable the local APIC and program LINT0/LINT1 entries. Without that,
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| 25 | ;; virtual wire interrupts could not be delivered. Note that the APIC must
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| 26 | ;; be enabled first because when disabled, all LVTs are forced masked.
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| 27 |
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| 28 | pmode_setup proc near
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| 29 |
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| 30 | .386
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| 31 | push eax
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| 32 | push esi
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| 33 | pushf
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| 34 | cli ; Interrupts would kill us!
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| 35 | call pmode_enter
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| 36 |
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| 37 | mov eax, cr0 ; Clear CR0.CD and CR0.NW
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| 38 | and eax, 09FFFFFFFh
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| 39 | mov cr0, eax
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| 40 |
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| 41 | mov esi, SVR ; Program the SVR -- enable the APIC,
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| 42 | mov eax, 010Fh ; set spurious interrupt vector to 15
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| 43 | mov [esi], eax
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| 44 |
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| 45 | mov esi, LVT_LINT0 ; Program LINT0 to ExtINT and unmask
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| 46 | mov eax, [esi]
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| 47 | and eax, 0FFFE00FFh
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| 48 | or ah, 7
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| 49 | mov [esi], eax
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| 50 |
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| 51 | mov esi, LVT_LINT1 ; Program LINT1 to NMI and unmask
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| 52 | mov eax, [esi]
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| 53 | and eax, 0FFFE00FFh
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| 54 | or ah, 4
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| 55 | mov [esi], eax
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| 56 |
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| 57 | call pmode_exit
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| 58 | popf
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| 59 | pop esi
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| 60 | pop eax
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| 61 | SET_DEFAULT_CPU_286
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| 62 | ret
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| 63 |
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| 64 | pmode_setup endp
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| 65 |
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