VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToPE32.asm@ 60600

Last change on this file since 60600 was 60557, checked in by vboxsync, 9 years ago

bs3kit: move real mode version of Bs3TestDoModes out of the default 16-bit code segment.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 4.7 KB
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1; $Id: bs3-mode-SwitchToPE32.asm 60557 2016-04-19 03:01:35Z vboxsync $
2;; @file
3; BS3Kit - Bs3SwitchToPE32
4;
5
6;
7; Copyright (C) 2007-2015 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "bs3kit-template-header.mac"
28
29
30;;
31; Switch to 32-bit unpaged protected mode from any other mode.
32;
33; @cproto BS3_DECL(void) Bs3SwitchToPE32(void);
34;
35; @uses Nothing (except high 32-bit register parts), upper part of ESP is
36; cleared if caller is in 16-bit mode.
37;
38; @remarks Obviously returns to 32-bit mode, even if the caller was
39; in 16-bit or 64-bit mode.
40;
41; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
42;
43BS3_GLOBAL_NAME_EX TMPL_NM(Bs3SwitchToPE32_Safe), function, 0
44BS3_PROC_BEGIN_MODE Bs3SwitchToPE32, BS3_PBC_NEAR
45%ifdef TMPL_PE32
46 ret
47
48%elif BS3_MODE_IS_V86(TMPL_MODE)
49 ;
50 ; V8086 - Switch to 16-bit ring-0 and call worker for that mode.
51 ;
52 extern BS3_CMN_NM(Bs3SwitchToRing0)
53 call BS3_CMN_NM(Bs3SwitchToRing0)
54 extern %[BS3_MODE_R0_NM_ %+ TMPL_MODE](Bs3SwitchToPE32)
55 jmp %[BS3_MODE_R0_NM_ %+ TMPL_MODE](Bs3SwitchToPE32)
56
57%else
58 ;
59 ; Switch to real mode.
60 ;
61 %if TMPL_BITS != 32
62 %if TMPL_BITS > 32
63 shl xPRE [xSP + xCB], 32 ; Adjust the return address from 64-bit to 32-bit.
64 add rsp, xCB - 4
65 %else
66 push word 0 ; Reserve space to expand the return address.
67 %endif
68 ; Must be in 16-bit segment when calling Bs3SwitchTo16Bit.
69 jmp .sixteen_bit_segment
70BS3_BEGIN_TEXT16
71 BS3_SET_BITS TMPL_BITS
72.sixteen_bit_segment:
73 %endif
74
75 ;
76 ; Switch to real mode.
77 ;
78 extern TMPL_NM(Bs3SwitchToRM)
79 call TMPL_NM(Bs3SwitchToRM)
80 BS3_SET_BITS 16
81
82 push eax
83 pushfd
84 cli
85
86 ;
87 ; Load the GDT and enable PE32.
88 ;
89BS3_EXTERN_SYSTEM16 Bs3Lgdt_Gdt
90BS3_BEGIN_TEXT16
91 mov ax, BS3SYSTEM16
92 mov ds, ax
93 lgdt [Bs3Lgdt_Gdt]
94
95 mov eax, cr0
96 or eax, X86_CR0_PE
97 mov cr0, eax
98 jmp BS3_SEL_R0_CS32:dword .thirty_two_bit wrt FLAT
99BS3_BEGIN_TEXT32
100.thirty_two_bit:
101
102 ;
103 ; Convert the (now) real mode stack pointer to 32-bit flat.
104 ;
105 xor eax, eax
106 mov ax, ss
107 shl eax, 4
108 and esp, 0ffffh
109 add esp, eax
110
111 mov ax, BS3_SEL_R0_SS32
112 mov ss, ax
113
114 ;
115 ; Call rountine for doing mode specific setups.
116 ;
117 extern NAME(Bs3EnteredMode_pe32)
118 call NAME(Bs3EnteredMode_pe32)
119
120 ;
121 ; Restore eax and flags (IF).
122 ;
123 %if TMPL_BITS < 32
124 and esp, 0ffffh ; Make sure the high word is zero.
125 movzx eax, word [esp + 8 + 2] ; Load return address.
126 add eax, BS3_ADDR_BS3TEXT16 ; Convert it to a flat address.
127 mov [esp + 8], eax ; Store it in the place right for 32-bit returns.
128 %endif
129 popfd
130 pop eax
131 ret
132
133 %if TMPL_BITS != 32
134TMPL_BEGIN_TEXT
135 %endif
136%endif
137BS3_PROC_END_MODE Bs3SwitchToPE32
138
139
140%if TMPL_BITS == 16
141;;
142; Custom far stub.
143BS3_BEGIN_TEXT16_FARSTUBS
144BS3_PROC_BEGIN_MODE Bs3SwitchToPE32, BS3_PBC_FAR
145 inc bp
146 push bp
147 mov bp, sp
148
149 ; Call the real thing.
150 call TMPL_NM(Bs3SwitchToPE32)
151 BS3_SET_BITS 32
152
153 ; Jmp to common code for the tedious conversion.
154 %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
155 extern _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c32
156 jmp _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c32
157 %else
158 extern _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c32
159 jmp _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c32
160 %endif
161 BS3_SET_BITS 16
162BS3_PROC_END_MODE Bs3SwitchToPE32
163%endif
164
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