1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
; $Id: bs3-first-pe16.asm $
;; @file
; BS3Kit - First Object, calling 16-bit protected-mode main().
;
;
; Copyright (C) 2007-2019 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.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
;
; Segment defs, grouping and related variables.
; Defines the entry point 'start' as well, leaving us in BS3TEXT16.
;
%include "bs3-first-common.mac"
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
BS3_BEGIN_DATA16
BS3_BEGIN_RMTEXT16
extern _Bs3CpuDetect_rm_far
extern _Bs3InitMemory_rm_far
BS3_BEGIN_TEXT16
BS3_EXTERN_CMN Bs3PicMaskAll
BS3_EXTERN_CMN Bs3Trap16Init
extern _Bs3SwitchToPE16_rm
extern _Main_pe16
BS3_EXTERN_CMN Bs3Shutdown
BS3_BEGIN_TEXT16
;
; Zero return address and zero caller BP.
;
xor ax, ax
push ax
push ax
mov bp, sp
;
; Load DS and ES with data selectors.
;
mov ax, BS3KIT_GRPNM_DATA16
mov ds, ax
mov es, ax
;
; Make sure interrupts are disabled as we cannot (don't want to) service
; BIOS interrupts once we switch mode.
;
cli
call Bs3PicMaskAll
;
; Initialize 16-bit protected mode.
;
call far _Bs3CpuDetect_rm_far
call far _Bs3InitMemory_rm_far
call Bs3Trap16Init
;
; Switch to PE16 and call main.
;
call _Bs3SwitchToPE16_rm
call _Main_pe16
; Try shutdown if it returns.
call Bs3Shutdown
|
