| 1 | ; $Id: pmsetup.inc 106061 2024-09-16 14:03:52Z 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) 2004-2024 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; SPDX-License-Identifier: GPL-3.0-only
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| 26 | ;
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| 27 |
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| 28 | SVR equ 0FEE000F0h
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| 29 | LVT_LINT0 equ 0FEE00350h
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| 30 | LVT_LINT1 equ 0FEE00360h
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| 31 |
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| 32 | public pmode_setup
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| 33 |
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| 34 | ;; Enable the local APIC and program LINT0/LINT1 entries. Without that,
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| 35 | ;; virtual wire interrupts could not be delivered. Note that the APIC must
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| 36 | ;; be enabled first because when disabled, all LVTs are forced masked.
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| 37 |
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| 38 | pmode_setup proc near
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| 39 |
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| 40 | .386
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| 41 | push eax
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| 42 | push esi
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| 43 | pushf
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| 44 | cli ; Interrupts would kill us!
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| 45 | call pmode_enter
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| 46 |
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| 47 | mov eax, cr0 ; Clear CR0.CD and CR0.NW
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| 48 | and eax, 09FFFFFFFh
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| 49 | mov cr0, eax
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| 50 |
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| 51 | mov esi, SVR ; Program the SVR -- enable the APIC,
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| 52 | mov eax, 010Fh ; set spurious interrupt vector to 15
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| 53 | mov [esi], eax
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| 54 |
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| 55 | mov esi, LVT_LINT0 ; Program LINT0 to ExtINT and unmask
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| 56 | mov eax, [esi]
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| 57 | and eax, 0FFFE00FFh
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| 58 | or ah, 7
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| 59 | mov [esi], eax
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| 60 |
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| 61 | mov esi, LVT_LINT1 ; Program LINT1 to NMI and unmask
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| 62 | mov eax, [esi]
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| 63 | and eax, 0FFFE00FFh
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| 64 | or ah, 4
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| 65 | mov [esi], eax
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| 66 |
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| 67 | call pmode_exit
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| 68 | popf
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| 69 | pop esi
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| 70 | pop eax
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| 71 | SET_DEFAULT_CPU_286
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| 72 | ret
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| 73 |
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| 74 | pmode_setup endp
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| 75 |
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