| 1 | ; $Id: bs3-first-pe16.asm 82968 2020-02-04 10:35:17Z 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) 2007-2020 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 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 |
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| 28 | ;*********************************************************************************************************************************
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| 29 | ;* Header Files *
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| 30 | ;*********************************************************************************************************************************
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| 31 |
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| 32 | ;
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| 33 | ; Segment defs, grouping and related variables.
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| 34 | ; Defines the entry point 'start' as well, leaving us in BS3TEXT16.
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| 35 | ;
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| 36 | %include "bs3-first-common.mac"
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| 37 |
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| 38 |
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| 39 | ;*********************************************************************************************************************************
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| 40 | ;* External Symbols *
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| 41 | ;*********************************************************************************************************************************
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| 42 | BS3_BEGIN_DATA16
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| 43 |
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| 44 | BS3_BEGIN_RMTEXT16
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| 45 | extern _Bs3CpuDetect_rm_far
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| 46 | extern _Bs3InitMemory_rm_far
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| 47 |
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| 48 | BS3_BEGIN_TEXT16
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| 49 | BS3_EXTERN_CMN Bs3PicMaskAll
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| 50 | BS3_EXTERN_CMN Bs3Trap16Init
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| 51 | extern _Bs3SwitchToPE16_rm
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| 52 | extern _Main_pe16
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| 53 | BS3_EXTERN_CMN Bs3Shutdown
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| 54 |
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| 55 |
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| 56 | BS3_BEGIN_TEXT16
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| 57 | ;
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| 58 | ; Zero return address and zero caller BP.
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| 59 | ;
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| 60 | xor ax, ax
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| 61 | push ax
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| 62 | push ax
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| 63 | mov bp, sp
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| 64 |
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| 65 | ;
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| 66 | ; Load DS and ES with data selectors.
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| 67 | ;
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| 68 | mov ax, BS3KIT_GRPNM_DATA16
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| 69 | mov ds, ax
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| 70 | mov es, ax
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| 71 |
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| 72 |
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| 73 | ;
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| 74 | ; Make sure interrupts are disabled as we cannot (don't want to) service
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| 75 | ; BIOS interrupts once we switch mode.
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| 76 | ;
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| 77 | cli
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| 78 | call Bs3PicMaskAll
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| 79 |
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| 80 | ;
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| 81 | ; Initialize 16-bit protected mode.
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| 82 | ;
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| 83 | call far _Bs3CpuDetect_rm_far
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| 84 | call far _Bs3InitMemory_rm_far
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| 85 | call Bs3Trap16Init
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| 86 |
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| 87 | ;
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| 88 | ; Switch to PE16 and call main.
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| 89 | ;
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| 90 | call _Bs3SwitchToPE16_rm
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| 91 | call _Main_pe16
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| 92 |
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| 93 | ; Try shutdown if it returns.
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| 94 | call Bs3Shutdown
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| 95 |
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