| 1 | ; $Id: bs3-first-pe16.asm 98103 2023-01-17 14:15:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - First Object, calling 16-bit protected-mode main().
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2023 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 | ; The contents of this file may alternatively be used under the terms
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| 26 | ; of the Common Development and Distribution License Version 1.0
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| 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | ; in the VirtualBox distribution, in which case the provisions of the
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| 29 | ; CDDL are applicable instead of those of the GPL.
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| 30 | ;
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| 31 | ; You may elect to license modified versions of this file under the
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| 32 | ; terms and conditions of either the GPL or the CDDL or both.
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| 33 | ;
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| 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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| 36 |
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| 37 |
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| 38 | ;*********************************************************************************************************************************
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| 39 | ;* Header Files *
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| 40 | ;*********************************************************************************************************************************
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| 41 |
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| 42 | ;
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| 43 | ; Segment defs, grouping and related variables.
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| 44 | ; Defines the entry point 'start' as well, leaving us in BS3TEXT16.
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| 45 | ;
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| 46 | %include "bs3-first-common.mac"
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| 47 |
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| 48 |
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| 49 | ;*********************************************************************************************************************************
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| 50 | ;* External Symbols *
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| 51 | ;*********************************************************************************************************************************
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| 52 | BS3_BEGIN_DATA16
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| 53 |
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| 54 | BS3_BEGIN_RMTEXT16
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| 55 | extern _Bs3CpuDetect_rm_far
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| 56 | extern _Bs3InitMemory_rm_far
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| 57 |
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| 58 | BS3_BEGIN_TEXT16
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| 59 | BS3_EXTERN_CMN Bs3PicMaskAll
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| 60 | BS3_EXTERN_CMN Bs3Trap16Init
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| 61 | extern _Bs3SwitchToPE16_rm
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| 62 | extern _Main_pe16
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| 63 | BS3_EXTERN_CMN Bs3Shutdown
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| 64 |
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| 65 |
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| 66 | BS3_BEGIN_TEXT16
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| 67 | ;
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| 68 | ; Zero return address and zero caller BP.
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| 69 | ;
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| 70 | xor ax, ax
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| 71 | push ax
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| 72 | push ax
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| 73 | mov bp, sp
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| 74 |
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| 75 | ;
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| 76 | ; Load DS and ES with data selectors.
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| 77 | ;
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| 78 | mov ax, BS3KIT_GRPNM_DATA16
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| 79 | mov ds, ax
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| 80 | mov es, ax
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| 81 |
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| 82 |
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| 83 | ;
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| 84 | ; Make sure interrupts are disabled as we cannot (don't want to) service
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| 85 | ; BIOS interrupts once we switch mode.
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| 86 | ;
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| 87 | cli
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| 88 | call Bs3PicMaskAll
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| 89 |
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| 90 | ;
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| 91 | ; Initialize 16-bit protected mode.
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| 92 | ;
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| 93 | call far _Bs3CpuDetect_rm_far
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| 94 | call far _Bs3InitMemory_rm_far
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| 95 | call Bs3Trap16Init
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| 96 |
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| 97 | ;
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| 98 | ; Switch to PE16 and call main.
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| 99 | ;
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| 100 | call _Bs3SwitchToPE16_rm
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| 101 | call _Main_pe16
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| 102 |
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| 103 | ; Try shutdown if it returns.
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| 104 | call Bs3Shutdown
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| 105 |
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