xref: /freebsd/sys/i386/include/vm86.h (revision ebacd8013fe5f7fdf9f6a5b286f6680dd2891036)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 1997 Jonathan Lemon
5  * All rights reserved.
6  *
7  * Derived from register.h, which is
8  *     Copyright (c) 1996 Michael Smith.  All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  * $FreeBSD$
32  */
33 
34 #ifndef _MACHINE_VM86_H_
35 #define _MACHINE_VM86_H_ 1
36 
37 /* standard register representation */
38 typedef union {
39 	u_int	r_ex;
40 	struct {
41 		u_short	r_x;
42 		u_int	:16;
43 	} r_w;
44 	struct {
45 		u_char	r_l;
46 		u_char	r_h;
47 		u_int	:16;
48 	} r_b;
49 } reg86_t;
50 
51 /* layout must match definition of struct trapframe_vm86 in <machine/frame.h> */
52 
53 struct vm86frame {
54 	int	kernel_fs;
55 	int	kernel_es;
56 	int	kernel_ds;
57 	reg86_t	edi;
58 	reg86_t	esi;
59 	reg86_t	ebp;
60 	reg86_t	isp;
61 	reg86_t	ebx;
62 	reg86_t	edx;
63 	reg86_t	ecx;
64 	reg86_t	eax;
65 	int	vmf_trapno;
66 	int	vmf_err;
67 	reg86_t	eip;
68 	reg86_t	cs;
69 	reg86_t	eflags;
70 	reg86_t	esp;
71 	reg86_t	ss;
72 	reg86_t	es;
73 	reg86_t	ds;
74 	reg86_t	fs;
75 	reg86_t	gs;
76 #define vmf_ah		eax.r_b.r_h
77 #define vmf_al		eax.r_b.r_l
78 #define vmf_ax		eax.r_w.r_x
79 #define vmf_eax		eax.r_ex
80 #define vmf_bh		ebx.r_b.r_h
81 #define vmf_bl		ebx.r_b.r_l
82 #define vmf_bx		ebx.r_w.r_x
83 #define vmf_ebx		ebx.r_ex
84 #define vmf_ch		ecx.r_b.r_h
85 #define vmf_cl		ecx.r_b.r_l
86 #define vmf_cx		ecx.r_w.r_x
87 #define vmf_ecx		ecx.r_ex
88 #define vmf_dh		edx.r_b.r_h
89 #define vmf_dl		edx.r_b.r_l
90 #define vmf_dx		edx.r_w.r_x
91 #define vmf_edx		edx.r_ex
92 #define vmf_si		esi.r_w.r_x
93 #define vmf_di		edi.r_w.r_x
94 #define vmf_cs		cs.r_w.r_x
95 #define vmf_ds		ds.r_w.r_x
96 #define vmf_es		es.r_w.r_x
97 #define vmf_ss		ss.r_w.r_x
98 #define vmf_bp		ebp.r_w.r_x
99 #define vmf_sp		esp.r_w.r_x
100 #define vmf_ip		eip.r_w.r_x
101 #define vmf_flags	eflags.r_w.r_x
102 #define vmf_eflags	eflags.r_ex
103 };
104 
105 #define VM86_PMAPSIZE	24
106 #define VMAP_MALLOC	1	/* page was malloced by us */
107 
108 struct vm86context {
109 	int	npages;
110 	struct	vm86pmap {
111 		int	flags;
112 		int	pte_num;
113 		vm_offset_t	kva;
114 		uint64_t	old_pte;
115 	} pmap[VM86_PMAPSIZE];
116 };
117 
118 #define VM_USERCHANGE   (PSL_USERCHANGE)
119 #define VME_USERCHANGE  (VM_USERCHANGE | PSL_VIP | PSL_VIF)
120 
121 struct vm86_kernel {
122 	caddr_t	vm86_intmap;			/* interrupt map */
123 	u_int	vm86_eflags;			/* emulated flags */
124 	int	vm86_has_vme;			/* VME support */
125 	int	vm86_inited;			/* we were initialized */
126 	int	vm86_debug;
127 	caddr_t	vm86_sproc;			/* address of sproc */
128 };
129 
130 #define VM86_INIT	1
131 #define VM86_SET_VME	2
132 #define VM86_GET_VME	3
133 #define VM86_INTCALL	4
134 
135 struct vm86_init_args {
136         int     debug;                  /* debug flag */
137         int     cpu_type;               /* cpu type to emulate */
138         u_char  int_map[32];            /* interrupt map */
139 };
140 
141 struct vm86_vme_args {
142 	int	state;			/* status */
143 };
144 
145 struct vm86_intcall_args {
146 	int	intnum;
147 	struct 	vm86frame vmf;
148 };
149 
150 #ifdef _KERNEL
151 extern 	int vm86paddr;
152 
153 struct thread;
154 extern	int vm86_emulate(struct vm86frame *);
155 extern	int vm86_sysarch(struct thread *, char *);
156 extern void vm86_trap(struct vm86frame *);
157 extern 	int vm86_intcall(int, struct vm86frame *);
158 extern 	int vm86_datacall(int, struct vm86frame *, struct vm86context *);
159 extern void vm86_initialize(void);
160 extern vm_offset_t vm86_getpage(struct vm86context *, int);
161 extern vm_offset_t vm86_addpage(struct vm86context *, int, vm_offset_t);
162 extern int vm86_getptr(struct vm86context *, vm_offset_t, u_short *, u_short *);
163 
164 extern vm_offset_t vm86_getaddr(struct vm86context *, u_short, u_short);
165 #endif /* _KERNEL */
166 
167 #endif /* _MACHINE_VM86_H_ */
168