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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 
62 struct 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 
92 struct revectored_struct {
93 	unsigned long __map[8];			/* 256 bits */
94 };
95 
96 struct 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 
110 struct 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 };
118 struct 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