1#ifndef _UAPI_ASM_X86_VM86_H
2#define _UAPI_ASM_X86_VM86_H
3
4/*
5 * I'm guessing at the VIF/VIP flag usage, but hope that this is how
6 * the Pentium uses them. Linux will return from vm86 mode when both
7 * VIF and VIP is set.
8 *
9 * On a Pentium, we could probably optimize the virtual flags directly
10 * in the eflags register instead of doing it "by hand" in vflags...
11 *
12 * Linus
13 */
14
15#include <asm/processor-flags.h>
16
17#define BIOSSEG		0x0f000
18
19#define CPU_086		0
20#define CPU_186		1
21#define CPU_286		2
22#define CPU_386		3
23#define CPU_486		4
24#define CPU_586		5
25
26/*
27 * Return values for the 'vm86()' system call
28 */
29#define VM86_TYPE(retval)	((retval) & 0xff)
30#define VM86_ARG(retval)	((retval) >> 8)
31
32#define VM86_SIGNAL	0	/* return due to signal */
33#define VM86_UNKNOWN	1	/* unhandled GP fault
34				   - IO-instruction or similar */
35#define VM86_INTx	2	/* int3/int x instruction (ARG = x) */
36#define VM86_STI	3	/* sti/popf/iret instruction enabled
37				   virtual interrupts */
38
39/*
40 * Additional return values when invoking new vm86()
41 */
42#define VM86_PICRETURN	4	/* return due to pending PIC request */
43#define VM86_TRAP	6	/* return due to DOS-debugger request */
44
45/*
46 * function codes when invoking new vm86()
47 */
48#define VM86_PLUS_INSTALL_CHECK	0
49#define VM86_ENTER		1
50#define VM86_ENTER_NO_BYPASS	2
51#define	VM86_REQUEST_IRQ	3
52#define VM86_FREE_IRQ		4
53#define VM86_GET_IRQ_BITS	5
54#define VM86_GET_AND_RESET_IRQ	6
55
56/*
57 * This is the stack-layout seen by the user space program when we have
58 * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
59 * is 'kernel_vm86_regs' (see below).
60 */
61
62struct vm86_regs {
63/*
64 * normal regs, with special meaning for the segment descriptors..
65 */
66	long ebx;
67	long ecx;
68	long edx;
69	long esi;
70	long edi;
71	long ebp;
72	long eax;
73	long __null_ds;
74	long __null_es;
75	long __null_fs;
76	long __null_gs;
77	long orig_eax;
78	long eip;
79	unsigned short cs, __csh;
80	long eflags;
81	long esp;
82	unsigned short ss, __ssh;
83/*
84 * these are specific to v86 mode:
85 */
86	unsigned short es, __esh;
87	unsigned short ds, __dsh;
88	unsigned short fs, __fsh;
89	unsigned short gs, __gsh;
90};
91
92struct revectored_struct {
93	unsigned long __map[8];			/* 256 bits */
94};
95
96struct vm86_struct {
97	struct vm86_regs regs;
98	unsigned long flags;
99	unsigned long screen_bitmap;
100	unsigned long cpu_type;
101	struct revectored_struct int_revectored;
102	struct revectored_struct int21_revectored;
103};
104
105/*
106 * flags masks
107 */
108#define VM86_SCREEN_BITMAP	0x0001
109
110struct vm86plus_info_struct {
111	unsigned long force_return_for_pic:1;
112	unsigned long vm86dbg_active:1;       /* for debugger */
113	unsigned long vm86dbg_TFpendig:1;     /* for debugger */
114	unsigned long unused:28;
115	unsigned long is_vm86pus:1;	      /* for vm86 internal use */
116	unsigned char vm86dbg_intxxtab[32];   /* for debugger */
117};
118struct vm86plus_struct {
119	struct vm86_regs regs;
120	unsigned long flags;
121	unsigned long screen_bitmap;
122	unsigned long cpu_type;
123	struct revectored_struct int_revectored;
124	struct revectored_struct int21_revectored;
125	struct vm86plus_info_struct vm86plus;
126};
127
128
129#endif /* _UAPI_ASM_X86_VM86_H */
130