bs3-mode-EnteredMode.asm@ 60676

Last change on this file since 60676 was 60676, checked in by vboxsync, 9 years ago
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1	; $Id: bs3-mode-EnteredMode.asm 60676 2016-04-24 11:04:57Z vboxsync $
2	;; @file
3	; BS3Kit - Bs3EnteredMode
4	;
5
6	;
7	; Copyright (C) 2007-2016 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
30	BS3_EXTERN_DATA16 g_uBs3CpuDetected
31	%endif
32	BS3_EXTERN_DATA16 g_bBs3CurrentMode
33	TMPL_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	;
42	BS3_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	%if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
47	push rcx
48	push rdx
49	push r8
50	push r9
51	%endif
52
53	;
54	; Load stack selector (not always necessary) and sometimes CS too.
55	;
56	%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
57	xor ax, ax
58	%elif BS3_MODE_IS_V86(TMPL_MODE)
59	extern v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
60	call v86_versions_of_Bs3EnteredMode_should_not_be_dragged_into_the_link
61	%elif BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
62	jmp BS3_SEL_R0_CS16:.reloaded_cs
63	.reloaded_cs:
64	mov ax, BS3_SEL_R0_SS16
65	%elif BS3_MODE_IS_32BIT_CODE(TMPL_MODE)
66	mov ax, BS3_SEL_R0_SS32
67	%elif BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
68	mov ax, BS3_SEL_R0_DS64
69	%else
70	%error "TMPL_MODE"
71	%endif
72	mov ss, ax
73
74	;
75	; Load selector appropriate for accessing BS3SYSTEM16 data.
76	;
77	%if BS3_MODE_IS_16BIT_CODE(TMPL_MODE)
78	mov ax, BS3_SEL_SYSTEM16
79	%else
80	mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
81	%endif
82	mov ds, ax
83
84	;
85	; Load the appropritate IDT or IVT.
86	; Always 64-bit in long mode, otherwise according to TMPL_BITS.
87	;
88	%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
89	BS3_EXTERN_SYSTEM16 Bs3Lidt_Ivt
90	TMPL_BEGIN_TEXT
91	lidt [Bs3Lidt_Ivt]
92
93	%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
94	BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt16
95	TMPL_BEGIN_TEXT
96	lidt [Bs3Lidt_Idt16 TMPL_WRT_SYSTEM16_OR_FLAT]
97
98	%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
99	BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt32
100	TMPL_BEGIN_TEXT
101	lidt [Bs3Lidt_Idt32 TMPL_WRT_SYSTEM16_OR_FLAT]
102
103	%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
104	BS3_EXTERN_SYSTEM16 Bs3Lidt_Idt64
105	TMPL_BEGIN_TEXT
106	lidt [Bs3Lidt_Idt64 TMPL_WRT_SYSTEM16_OR_FLAT]
107	%else
108	%error "TMPL_MODE"
109	%endif
110
111	%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
112	;
113	; Load the appropriate task selector.
114	; Always 64-bit in long mode, otherwise according to TMPL_BITS.
115	;
116	%if BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
117	BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss64
118	TMPL_BEGIN_TEXT
119	and byte [5 + Bs3Gdte_Tss64 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
120	mov ax, BS3_SEL_TSS64
121
122	%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
123	BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16
124	BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss16DoubleFault
125	TMPL_BEGIN_TEXT
126	and byte [5 + Bs3Gdte_Tss16 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
127	and byte [5 + Bs3Gdte_Tss16DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
128	mov ax, BS3_SEL_TSS16
129
130	%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
131	BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32
132	BS3_EXTERN_SYSTEM16 Bs3Gdte_Tss32DoubleFault
133	BS3_EXTERN_SYSTEM16 Bs3Tss32
134	BS3_EXTERN_SYSTEM16 Bs3Tss32DoubleFault
135	TMPL_BEGIN_TEXT
136	and byte [5 + Bs3Gdte_Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
137	and byte [5 + Bs3Gdte_Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], ~X86_SEL_TYPE_SYS_TSS_BUSY_MASK
138	mov eax, cr3
139	mov [X86TSS32.cr3 + Bs3Tss32 TMPL_WRT_SYSTEM16_OR_FLAT], eax
140	mov [X86TSS32.cr3 + Bs3Tss32DoubleFault TMPL_WRT_SYSTEM16_OR_FLAT], eax
141	mov ax, BS3_SEL_TSS32
142	%else
143	%error "TMPL_BITS"
144	%endif
145	ltr ax
146	%endif ; !TMPL_CMN_R86
147
148	%if !BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
149	;
150	; Load the LDT.
151	;
152	mov ax, BS3_SEL_LDT
153	lldt ax
154	%endif
155
156	;
157	; Load ds and es; clear fs and gs.
158	;
159	%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
160	mov ax, BS3_SEL_DATA16
161	%else
162	mov ax, RT_CONCAT(BS3_SEL_R0_DS,TMPL_BITS)
163	%endif
164	mov ds, ax
165	mov es, ax
166
167	%if TMPL_BITS == 16
168	; For restoring after Bs3Trap* calls below.
169	push ax
170	push ax
171
172	cmp byte [BS3_DATA16_WRT(g_uBs3CpuDetected)], BS3CPU_80286
173	jbe .skip_fs_gs
174	%endif
175	xor ax, ax
176	mov fs, ax
177	mov gs, ax
178	.skip_fs_gs:
179
180	;
181	; Set global indicating CPU mode.
182	;
183	mov byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], TMPL_MODE
184
185	;
186	; Install system call handler.
187	; Always 64-bit in long mode, otherwise according to TMPL_BITS.
188	;
189	%if BS3_MODE_IS_RM_SYS(TMPL_MODE)
190	extern _Bs3TrapSystemCallHandler_rm
191	mov word [ss: BS3_TRAP_SYSCALL*4], _Bs3TrapSystemCallHandler_rm wrt CGROUP16
192	mov word [ss: BS3_TRAP_SYSCALL*4 + 2], CGROUP16
193
194	%elif BS3_MODE_IS_16BIT_SYS(TMPL_MODE)
195	BS3_EXTERN_CMN Bs3Trap16SetGate
196	extern TMPL_NM(Bs3TrapSystemCallHandler)
197	BS3_BEGIN_TEXT16
198	TMPL_BEGIN_TEXT
199	push 0 ; cParams
200	push TMPL_NM(Bs3TrapSystemCallHandler) wrt CGROUP16
201	push BS3_SEL_R0_CS16
202	push 3 ; DPL
203	push X86_SEL_TYPE_SYS_286_INT_GATE
204	push BS3_TRAP_SYSCALL
205	BS3_CALL Bs3Trap16SetGate,6
206	add xSP, xCB * 6
207
208	%elif BS3_MODE_IS_32BIT_SYS(TMPL_MODE)
209	BS3_EXTERN_CMN Bs3Trap32SetGate
210	extern TMPL_NM(Bs3TrapSystemCallHandler)
211	TMPL_BEGIN_TEXT
212	push 0 ; cParams
213	push dword TMPL_NM(Bs3TrapSystemCallHandler) wrt FLAT
214	push BS3_SEL_R0_CS32
215	push 3 ; DPL
216	push X86_SEL_TYPE_SYS_386_INT_GATE
217	push BS3_TRAP_SYSCALL
218	BS3_CALL Bs3Trap32SetGate,6
219	add xSP, xCB * 6
220
221	%elif BS3_MODE_IS_64BIT_SYS(TMPL_MODE)
222	BS3_EXTERN_CMN Bs3Trap64SetGate
223	extern _Bs3TrapSystemCallHandler_lm64
224	TMPL_BEGIN_TEXT
225	push 0 ; bIst
226	%if BS3_MODE_IS_64BIT_CODE(TMPL_MODE)
227	push _Bs3TrapSystemCallHandler_lm64 wrt FLAT
228	%else
229	push dword 0 ; upper offset
230	push dword _Bs3TrapSystemCallHandler_lm64 wrt FLAT
231	%endif
232	push BS3_SEL_R0_CS64
233	push 3 ; DPL
234	push AMD64_SEL_TYPE_SYS_INT_GATE
235	push BS3_TRAP_SYSCALL
236	BS3_CALL Bs3Trap64SetGate,6
237	add xSP, xCB * 5 + 8
238	%else
239	%error "TMPL_BITS"
240	%endif
241
242	%if TMPL_BITS == 16
243	; Restoring ds and es after the above calls.
244	pop es
245	pop ds
246	%endif
247
248	;
249	; Epilogue.
250	;
251	%if TMPL_BITS == 64
252	pop r9
253	pop r8
254	pop rdx
255	pop rcx
256	%endif
257	pop xAX
258	%ifdef BS3_STRICT
259	cmp xBP, xSP
260	je .return_stack_ok
261	int3
262	.return_stack_ok:
263	%endif
264	pop xBP
265	ret
266	BS3_PROC_END_MODE Bs3EnteredMode
267

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source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-EnteredMode.asm@ 60676

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