1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | #ifndef _UAPI_ASM_X86_VM86_H |
3 | #define _UAPI_ASM_X86_VM86_H |
4 | |
5 | /* |
6 | * I'm guessing at the VIF/VIP flag usage, but hope that this is how |
7 | * the Pentium uses them. Linux will return from vm86 mode when both |
8 | * VIF and VIP is set. |
9 | * |
10 | * On a Pentium, we could probably optimize the virtual flags directly |
11 | * in the eflags register instead of doing it "by hand" in vflags... |
12 | * |
13 | * Linus |
14 | */ |
15 | |
16 | #include <asm/processor-flags.h> |
17 | |
18 | #define BIOSSEG 0x0f000 |
19 | |
20 | #define CPU_086 0 |
21 | #define CPU_186 1 |
22 | #define CPU_286 2 |
23 | #define CPU_386 3 |
24 | #define CPU_486 4 |
25 | #define CPU_586 5 |
26 | |
27 | /* |
28 | * Return values for the 'vm86()' system call |
29 | */ |
30 | #define VM86_TYPE(retval) ((retval) & 0xff) |
31 | #define VM86_ARG(retval) ((retval) >> 8) |
32 | |
33 | #define VM86_SIGNAL 0 /* return due to signal */ |
34 | #define VM86_UNKNOWN 1 /* unhandled GP fault |
35 | - IO-instruction or similar */ |
36 | #define VM86_INTx 2 /* int3/int x instruction (ARG = x) */ |
37 | #define VM86_STI 3 /* sti/popf/iret instruction enabled |
38 | virtual interrupts */ |
39 | |
40 | /* |
41 | * Additional return values when invoking new vm86() |
42 | */ |
43 | #define VM86_PICRETURN 4 /* return due to pending PIC request */ |
44 | #define VM86_TRAP 6 /* return due to DOS-debugger request */ |
45 | |
46 | /* |
47 | * function codes when invoking new vm86() |
48 | */ |
49 | #define VM86_PLUS_INSTALL_CHECK 0 |
50 | #define VM86_ENTER 1 |
51 | #define VM86_ENTER_NO_BYPASS 2 |
52 | #define VM86_REQUEST_IRQ 3 |
53 | #define VM86_FREE_IRQ 4 |
54 | #define VM86_GET_IRQ_BITS 5 |
55 | #define VM86_GET_AND_RESET_IRQ 6 |
56 | |
57 | /* |
58 | * This is the stack-layout seen by the user space program when we have |
59 | * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout |
60 | * is 'kernel_vm86_regs' (see below). |
61 | */ |
62 | |
63 | struct vm86_regs { |
64 | /* |
65 | * normal regs, with special meaning for the segment descriptors.. |
66 | */ |
67 | long ebx; |
68 | long ecx; |
69 | long edx; |
70 | long esi; |
71 | long edi; |
72 | long ebp; |
73 | long eax; |
74 | long __null_ds; |
75 | long __null_es; |
76 | long __null_fs; |
77 | long __null_gs; |
78 | long orig_eax; |
79 | long eip; |
80 | unsigned short cs, __csh; |
81 | long eflags; |
82 | long esp; |
83 | unsigned short ss, __ssh; |
84 | /* |
85 | * these are specific to v86 mode: |
86 | */ |
87 | unsigned short es, __esh; |
88 | unsigned short ds, __dsh; |
89 | unsigned short fs, __fsh; |
90 | unsigned short gs, __gsh; |
91 | }; |
92 | |
93 | struct revectored_struct { |
94 | unsigned long __map[8]; /* 256 bits */ |
95 | }; |
96 | |
97 | struct vm86_struct { |
98 | struct vm86_regs regs; |
99 | unsigned long flags; |
100 | unsigned long screen_bitmap; /* unused, preserved by vm86() */ |
101 | unsigned long cpu_type; |
102 | struct revectored_struct int_revectored; |
103 | struct revectored_struct int21_revectored; |
104 | }; |
105 | |
106 | /* |
107 | * flags masks |
108 | */ |
109 | #define VM86_SCREEN_BITMAP 0x0001 /* no longer supported */ |
110 | |
111 | struct vm86plus_info_struct { |
112 | unsigned long force_return_for_pic:1; |
113 | unsigned long vm86dbg_active:1; /* for debugger */ |
114 | unsigned long vm86dbg_TFpendig:1; /* for debugger */ |
115 | unsigned long unused:28; |
116 | unsigned long is_vm86pus:1; /* for vm86 internal use */ |
117 | unsigned char vm86dbg_intxxtab[32]; /* for debugger */ |
118 | }; |
119 | struct vm86plus_struct { |
120 | struct vm86_regs regs; |
121 | unsigned long flags; |
122 | unsigned long screen_bitmap; |
123 | unsigned long cpu_type; |
124 | struct revectored_struct int_revectored; |
125 | struct revectored_struct int21_revectored; |
126 | struct vm86plus_info_struct vm86plus; |
127 | }; |
128 | |
129 | |
130 | #endif /* _UAPI_ASM_X86_VM86_H */ |
131 | |