VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-EnteredMode.asm@ 84794

Last change on this file since 84794 was 82968, checked in by vboxsync, 5 years ago

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1; $Id: bs3-mode-EnteredMode.asm 82968 2020-02-04 10:35:17Z vboxsync $
2;; @file
3; BS3Kit - Bs3EnteredMode
4;
5
6;
7; Copyright (C) 2007-2020 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%if TMPL_BITS == 16
30BS3_EXTERN_DATA16 g_uBs3CpuDetected
31%endif
32BS3_EXTERN_DATA16 g_bBs3CurrentMode
33TMPL_BEGIN_TEXT
34
35;;
36; @cproto BS3_DECL(void) Bs3EnteredMode(void);
37;
38; @uses Nothing.
39;
40; @remarks ASSUMES we're in ring-0 when not in some kind of real mode.
41;
42BS3_PROC_BEGIN_MODE Bs3EnteredMode, BS3_PBC_NEAR ; won't need this outside the switchers, so always near.
43 push xBP
44 mov xBP, xSP
45 push xAX
46 push xCX
47 push xDX
48TONLY16 push xBX
49%if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
50 push r8
51 push r9
52%endif
53
54 ;
55 ; Load stack selector (not always necessary) and sometimes CS too.
56 ;
57%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
58 xor ax, ax
59%elif BS3_MODE_IS_V86(TMPL_MODE)
60 extern v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
61 call v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
62%elif BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
63 jmp BS3_SEL_R0_CS16:.reloaded_cs
64.reloaded_cs:
65 mov ax, BS3_SEL_R0_SS16
66%elif BS3_MODE_IS_32BIT_CODE(TMPL_MODE)
67 mov ax, BS3_SEL_R0_SS32
68%elif BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
69 mov ax, BS3_SEL_R0_DS64
70%else
71 %error "TMPL_MODE"
72%endif
73 mov ss, ax
74
75 ;
76 ; Load selector appropriate for accessing BS3SYSTEM16 data.
77 ;
78%if BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
79 mov ax, BS3_SEL_SYSTEM16
80%else
81 mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
82%endif
83 mov ds, ax
84
85 ;
86 ; Load the appropritate IDT or IVT.
87 ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
88 ;
89%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
90 BS3_EXTERN_SYSTEM16 Bs3Lidt_Ivt
91 TMPL_BEGIN_TEXT
92 lidt [Bs3Lidt_Ivt]
93
94%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
95 BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt16
96 TMPL_BEGIN_TEXT
97 lidt [Bs3Lidt_Idt16 TMPL_WRT_SYSTEM16_OR_FLAT]
98
99%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
100 BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt32
101 TMPL_BEGIN_TEXT
102 lidt [Bs3Lidt_Idt32 TMPL_WRT_SYSTEM16_OR_FLAT]
103
104%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
105 BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt64
106 TMPL_BEGIN_TEXT
107 lidt [Bs3Lidt_Idt64 TMPL_WRT_SYSTEM16_OR_FLAT]
108%else
109 %error "TMPL_MODE"
110%endif
111
112%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
113 ;
114 ; Load the appropriate task selector.
115 ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
116 ;
117 %if BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
118 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss64
119 TMPL_BEGIN_TEXT
120 and byte [5 + Bs3Gdte_Tss64 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
121 mov ax, BS3_SEL_TSS64
122
123 %elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
124 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16
125 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16DoubleFault
126 TMPL_BEGIN_TEXT
127 and byte [5 + Bs3Gdte_Tss16 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
128 and byte [5 + Bs3Gdte_Tss16DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
129 mov ax, BS3_SEL_TSS16
130
131 %elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
132 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32
133 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32DoubleFault
134 BS3_EXTERN_SYSTEM16 Bs3Tss32
135 BS3_EXTERN_SYSTEM16 Bs3Tss32DoubleFault
136 TMPL_BEGIN_TEXT
137 and byte [5 + Bs3Gdte_Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
138 and byte [5 + Bs3Gdte_Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
139 mov eax, cr3
140 mov [X86TSS32.cr3 + Bs3Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], eax
141 mov [X86TSS32.cr3 + Bs3Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], eax
142 mov ax, BS3_SEL_TSS32
143 %else
144 %error "TMPL_BITS"
145 %endif
146 ltr ax
147%endif ; !TMPL_CMN_R86
148
149%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
150 ;
151 ; Load the LDT.
152 ;
153 mov ax, BS3_SEL_LDT
154 lldt ax
155%endif
156
157 ;
158 ; Load ds and es; clear fs and gs.
159 ;
160%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
161 mov ax, BS3_SEL_DATA16
162%else
163 mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
164%endif
165 mov ds, ax
166 mov es, ax
167
168%if TMPL_BITS == 16
169 ; For restoring after Bs3Trap* calls below.
170 push ax
171 push ax
172
173 cmp byte [BS3_DATA16_WRT(g_uBs3CpuDetected)], BS3CPU_80286
174 jbe .skip_fs_gs
175%endif
176 xor ax, ax
177 mov fs, ax
178 mov gs, ax
179.skip_fs_gs:
180
181 ;
182 ; Set global indicating CPU mode.
183 ;
184 mov byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], TMPL_MODE
185
186 ;
187 ; Install system call handler.
188 ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
189 ;
190%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
191 extern _Bs3TrapSystemCallHandler_rm
192 mov word [ss: BS3_TRAP_SYSCALL*4], _Bs3TrapSystemCallHandler_rm wrt CGROUP16
193 mov word [ss: BS3_TRAP_SYSCALL*4 + 2], CGROUP16
194
195%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
196 BS3_EXTERN_CMN Bs3Trap16SetGate
197 extern TMPL_NM(Bs3TrapSystemCallHandler)
198 BS3_BEGIN_TEXT16
199 TMPL_BEGIN_TEXT
200 push 0 ; cParams
201 push TMPL_NM(Bs3TrapSystemCallHandler) wrt CGROUP16
202 push BS3_SEL_R0_CS16
203 push 3 ; DPL
204 push X86_SEL_TYPE_SYS_286_INT_GATE
205 push BS3_TRAP_SYSCALL
206 BS3_CALL Bs3Trap16SetGate,6
207 add xSP, xCB * 6
208
209%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
210 BS3_EXTERN_CMN Bs3Trap32SetGate
211 extern TMPL_NM(Bs3TrapSystemCallHandler)
212 TMPL_BEGIN_TEXT
213 push 0 ; cParams
214 push dword TMPL_NM(Bs3TrapSystemCallHandler) wrt FLAT
215 push BS3_SEL_R0_CS32
216 push 3 ; DPL
217 push X86_SEL_TYPE_SYS_386_INT_GATE
218 push BS3_TRAP_SYSCALL
219 BS3_CALL Bs3Trap32SetGate,6
220 add xSP, xCB * 6
221
222%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
223 BS3_EXTERN_CMN Bs3Trap64SetGate
224 extern _Bs3TrapSystemCallHandler_lm64
225 TMPL_BEGIN_TEXT
226 push 0 ; bIst
227 %if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
228 push _Bs3TrapSystemCallHandler_lm64 wrt FLAT
229 %else
230 push dword 0 ; upper offset
231 push dword _Bs3TrapSystemCallHandler_lm64 wrt FLAT
232 %endif
233 push BS3_SEL_R0_CS64
234 push 3 ; DPL
235 push AMD64_SEL_TYPE_SYS_INT_GATE
236 push BS3_TRAP_SYSCALL
237 BS3_CALL Bs3Trap64SetGate,6
238 add xSP, xCB * 5 + 8
239%else
240 %error "TMPL_BITS"
241%endif
242
243%if TMPL_BITS == 16
244 ; Restoring ds and es after the above calls.
245 pop es
246 pop ds
247%endif
248
249 ;
250 ; Epilogue.
251 ;
252%if TMPL_BITS == 64
253 pop r9
254 pop r8
255%endif
256TONLY16 pop xBX
257 pop xDX
258 pop xCX
259 pop xAX
260%ifdef BS3_STRICT
261 cmp xBP, xSP
262 je .return_stack_ok
263 int3
264.return_stack_ok:
265%endif
266 pop xBP
267 ret
268BS3_PROC_END_MODE Bs3EnteredMode
269
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