VirtualBox

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

Last change on this file was 106061, checked in by vboxsync, 3 months ago

Copyright year updates by scm.

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1; $Id: bs3-mode-EnteredMode.asm 106061 2024-09-16 14:03:52Z vboxsync $
2;; @file
3; BS3Kit - Bs3EnteredMode
4;
5
6;
7; Copyright (C) 2007-2024 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; The contents of this file may alternatively be used under the terms
26; of the Common Development and Distribution License Version 1.0
27; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28; in the VirtualBox distribution, in which case the provisions of the
29; CDDL are applicable instead of those of the GPL.
30;
31; You may elect to license modified versions of this file under the
32; terms and conditions of either the GPL or the CDDL or both.
33;
34; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35;
36
37%include "bs3kit-template-header.mac"
38
39%if TMPL_BITS == 16
40BS3_EXTERN_DATA16 g_uBs3CpuDetected
41%endif
42BS3_EXTERN_DATA16 g_bBs3CurrentMode
43TMPL_BEGIN_TEXT
44
45;;
46; @cproto BS3_DECL(void) Bs3EnteredMode(void);
47;
48; @uses Nothing.
49;
50; @remarks ASSUMES we're in ring-0 when not in some kind of real mode.
51;
52BS3_PROC_BEGIN_MODE Bs3EnteredMode, BS3_PBC_NEAR ; won't need this outside the switchers, so always near.
53 push xBP
54 mov xBP, xSP
55 push xAX
56 push xCX
57 push xDX
58TONLY16 push xBX
59%if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
60 push r8
61 push r9
62%endif
63
64 ;
65 ; Load stack selector (not always necessary) and sometimes CS too.
66 ;
67%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
68 xor ax, ax
69%elif BS3_MODE_IS_V86(TMPL_MODE)
70 extern v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
71 call v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
72%elif BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
73 jmp BS3_SEL_R0_CS16:.reloaded_cs
74.reloaded_cs:
75 mov ax, BS3_SEL_R0_SS16
76%elif BS3_MODE_IS_32BIT_CODE(TMPL_MODE)
77 mov ax, BS3_SEL_R0_SS32
78%elif BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
79 mov ax, BS3_SEL_R0_DS64
80%else
81 %error "TMPL_MODE"
82%endif
83 mov ss, ax
84
85 ;
86 ; Load selector appropriate for accessing BS3SYSTEM16 data.
87 ;
88%if BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
89 mov ax, BS3_SEL_SYSTEM16
90%else
91 mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
92%endif
93 mov ds, ax
94
95 ;
96 ; Load the appropritate IDT or IVT.
97 ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
98 ;
99%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
100 BS3_EXTERN_SYSTEM16 Bs3Lidt_Ivt
101 TMPL_BEGIN_TEXT
102 lidt [Bs3Lidt_Ivt]
103
104%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
105 BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt16
106 TMPL_BEGIN_TEXT
107 lidt [Bs3Lidt_Idt16 TMPL_WRT_SYSTEM16_OR_FLAT]
108
109%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
110 BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt32
111 TMPL_BEGIN_TEXT
112 lidt [Bs3Lidt_Idt32 TMPL_WRT_SYSTEM16_OR_FLAT]
113
114%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
115 BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt64
116 TMPL_BEGIN_TEXT
117 lidt [Bs3Lidt_Idt64 TMPL_WRT_SYSTEM16_OR_FLAT]
118%else
119 %error "TMPL_MODE"
120%endif
121
122%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
123 ;
124 ; Load the appropriate task selector.
125 ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
126 ;
127 %if BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
128 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss64
129 TMPL_BEGIN_TEXT
130 and byte [5 + Bs3Gdte_Tss64 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
131 mov ax, BS3_SEL_TSS64
132
133 %elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
134 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16
135 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16DoubleFault
136 TMPL_BEGIN_TEXT
137 and byte [5 + Bs3Gdte_Tss16 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
138 and byte [5 + Bs3Gdte_Tss16DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
139 mov ax, BS3_SEL_TSS16
140
141 %elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
142 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32
143 BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32DoubleFault
144 BS3_EXTERN_SYSTEM16 Bs3Tss32
145 BS3_EXTERN_SYSTEM16 Bs3Tss32DoubleFault
146 TMPL_BEGIN_TEXT
147 and byte [5 + Bs3Gdte_Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
148 and byte [5 + Bs3Gdte_Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
149 mov eax, cr3
150 mov [X86TSS32.cr3 + Bs3Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], eax
151 mov [X86TSS32.cr3 + Bs3Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], eax
152 mov ax, BS3_SEL_TSS32
153 %else
154 %error "TMPL_BITS"
155 %endif
156 ltr ax
157%endif ; !TMPL_CMN_R86
158
159%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
160 ;
161 ; Load the LDT.
162 ;
163 mov ax, BS3_SEL_LDT
164 lldt ax
165%endif
166
167 ;
168 ; Load ds and es; clear fs and gs.
169 ;
170%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
171 mov ax, BS3_SEL_DATA16
172%else
173 mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
174%endif
175 mov ds, ax
176 mov es, ax
177
178%if TMPL_BITS == 16
179 ; For restoring after Bs3Trap* calls below.
180 push ax
181 push ax
182
183 cmp byte [BS3_DATA16_WRT(g_uBs3CpuDetected)], BS3CPU_80286
184 jbe .skip_fs_gs
185%endif
186 xor ax, ax
187 mov fs, ax
188 mov gs, ax
189.skip_fs_gs:
190
191 ;
192 ; Set global indicating CPU mode.
193 ;
194 mov byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], TMPL_MODE
195
196 ;
197 ; Install system call handler.
198 ; Always 64-bit in long mode, otherwise according to TMPL_BITS.
199 ;
200%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
201 extern _Bs3TrapSystemCallHandler_rm
202 mov word [ss: BS3_TRAP_SYSCALL*4], _Bs3TrapSystemCallHandler_rm wrt CGROUP16
203 mov word [ss: BS3_TRAP_SYSCALL*4 + 2], CGROUP16
204
205%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
206 BS3_EXTERN_CMN Bs3Trap16SetGate
207 extern TMPL_NM(Bs3TrapSystemCallHandler)
208 BS3_BEGIN_TEXT16
209 TMPL_BEGIN_TEXT
210 push 0 ; cParams
211 push TMPL_NM(Bs3TrapSystemCallHandler) wrt CGROUP16
212 push BS3_SEL_R0_CS16
213 push 3 ; DPL
214 push X86_SEL_TYPE_SYS_286_INT_GATE
215 push BS3_TRAP_SYSCALL
216 BS3_CALL Bs3Trap16SetGate,6
217 add xSP, xCB * 6
218
219%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
220 BS3_EXTERN_CMN Bs3Trap32SetGate
221 extern TMPL_NM(Bs3TrapSystemCallHandler)
222 TMPL_BEGIN_TEXT
223 push 0 ; cParams
224 push dword TMPL_NM(Bs3TrapSystemCallHandler) wrt FLAT
225 push BS3_SEL_R0_CS32
226 push 3 ; DPL
227 push X86_SEL_TYPE_SYS_386_INT_GATE
228 push BS3_TRAP_SYSCALL
229 BS3_CALL Bs3Trap32SetGate,6
230 add xSP, xCB * 6
231
232%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
233 BS3_EXTERN_CMN Bs3Trap64SetGate
234 extern _Bs3TrapSystemCallHandler_lm64
235 TMPL_BEGIN_TEXT
236 push 0 ; bIst
237 %if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
238 push _Bs3TrapSystemCallHandler_lm64 wrt FLAT
239 %else
240 push dword 0 ; upper offset
241 push dword _Bs3TrapSystemCallHandler_lm64 wrt FLAT
242 %endif
243 push BS3_SEL_R0_CS64
244 push 3 ; DPL
245 push AMD64_SEL_TYPE_SYS_INT_GATE
246 push BS3_TRAP_SYSCALL
247 BS3_CALL Bs3Trap64SetGate,6
248 add xSP, xCB * 5 + 8
249%else
250 %error "TMPL_BITS"
251%endif
252
253%if TMPL_BITS == 16
254 ; Restoring ds and es after the above calls.
255 pop es
256 pop ds
257%endif
258
259 ;
260 ; Epilogue.
261 ;
262%if TMPL_BITS == 64
263 pop r9
264 pop r8
265%endif
266TONLY16 pop xBX
267 pop xDX
268 pop xCX
269 pop xAX
270%ifdef BS3_STRICT
271 cmp xBP, xSP
272 je .return_stack_ok
273 int3
274.return_stack_ok:
275%endif
276 pop xBP
277 ret
278BS3_PROC_END_MODE Bs3EnteredMode
279
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