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1da177e4 LT |
1 | #ifndef _LINUX_VM86_H |
2 | #define _LINUX_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 | #define TF_MASK 0x00000100 | |
16 | #define IF_MASK 0x00000200 | |
17 | #define IOPL_MASK 0x00003000 | |
18 | #define NT_MASK 0x00004000 | |
64ca9004 | 19 | #ifdef CONFIG_VM86 |
1da177e4 | 20 | #define VM_MASK 0x00020000 |
64ca9004 MM |
21 | #else |
22 | #define VM_MASK 0 /* ignored */ | |
23 | #endif | |
1da177e4 LT |
24 | #define AC_MASK 0x00040000 |
25 | #define VIF_MASK 0x00080000 /* virtual interrupt flag */ | |
26 | #define VIP_MASK 0x00100000 /* virtual interrupt pending */ | |
27 | #define ID_MASK 0x00200000 | |
28 | ||
29 | #define BIOSSEG 0x0f000 | |
30 | ||
31 | #define CPU_086 0 | |
32 | #define CPU_186 1 | |
33 | #define CPU_286 2 | |
34 | #define CPU_386 3 | |
35 | #define CPU_486 4 | |
36 | #define CPU_586 5 | |
37 | ||
38 | /* | |
39 | * Return values for the 'vm86()' system call | |
40 | */ | |
41 | #define VM86_TYPE(retval) ((retval) & 0xff) | |
42 | #define VM86_ARG(retval) ((retval) >> 8) | |
43 | ||
44 | #define VM86_SIGNAL 0 /* return due to signal */ | |
45 | #define VM86_UNKNOWN 1 /* unhandled GP fault - IO-instruction or similar */ | |
46 | #define VM86_INTx 2 /* int3/int x instruction (ARG = x) */ | |
47 | #define VM86_STI 3 /* sti/popf/iret instruction enabled virtual interrupts */ | |
48 | ||
49 | /* | |
50 | * Additional return values when invoking new vm86() | |
51 | */ | |
52 | #define VM86_PICRETURN 4 /* return due to pending PIC request */ | |
53 | #define VM86_TRAP 6 /* return due to DOS-debugger request */ | |
54 | ||
55 | /* | |
56 | * function codes when invoking new vm86() | |
57 | */ | |
58 | #define VM86_PLUS_INSTALL_CHECK 0 | |
59 | #define VM86_ENTER 1 | |
60 | #define VM86_ENTER_NO_BYPASS 2 | |
61 | #define VM86_REQUEST_IRQ 3 | |
62 | #define VM86_FREE_IRQ 4 | |
63 | #define VM86_GET_IRQ_BITS 5 | |
64 | #define VM86_GET_AND_RESET_IRQ 6 | |
65 | ||
66 | /* | |
67 | * This is the stack-layout seen by the user space program when we have | |
68 | * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout | |
69 | * is 'kernel_vm86_regs' (see below). | |
70 | */ | |
71 | ||
72 | struct vm86_regs { | |
73 | /* | |
74 | * normal regs, with special meaning for the segment descriptors.. | |
75 | */ | |
76 | long ebx; | |
77 | long ecx; | |
78 | long edx; | |
79 | long esi; | |
80 | long edi; | |
81 | long ebp; | |
82 | long eax; | |
83 | long __null_ds; | |
84 | long __null_es; | |
85 | long __null_fs; | |
86 | long __null_gs; | |
87 | long orig_eax; | |
88 | long eip; | |
89 | unsigned short cs, __csh; | |
90 | long eflags; | |
91 | long esp; | |
92 | unsigned short ss, __ssh; | |
93 | /* | |
94 | * these are specific to v86 mode: | |
95 | */ | |
96 | unsigned short es, __esh; | |
97 | unsigned short ds, __dsh; | |
98 | unsigned short fs, __fsh; | |
99 | unsigned short gs, __gsh; | |
100 | }; | |
101 | ||
102 | struct revectored_struct { | |
103 | unsigned long __map[8]; /* 256 bits */ | |
104 | }; | |
105 | ||
106 | struct vm86_struct { | |
107 | struct vm86_regs regs; | |
108 | unsigned long flags; | |
109 | unsigned long screen_bitmap; | |
110 | unsigned long cpu_type; | |
111 | struct revectored_struct int_revectored; | |
112 | struct revectored_struct int21_revectored; | |
113 | }; | |
114 | ||
115 | /* | |
116 | * flags masks | |
117 | */ | |
118 | #define VM86_SCREEN_BITMAP 0x0001 | |
119 | ||
120 | struct vm86plus_info_struct { | |
121 | unsigned long force_return_for_pic:1; | |
122 | unsigned long vm86dbg_active:1; /* for debugger */ | |
123 | unsigned long vm86dbg_TFpendig:1; /* for debugger */ | |
124 | unsigned long unused:28; | |
125 | unsigned long is_vm86pus:1; /* for vm86 internal use */ | |
126 | unsigned char vm86dbg_intxxtab[32]; /* for debugger */ | |
127 | }; | |
128 | ||
129 | struct vm86plus_struct { | |
130 | struct vm86_regs regs; | |
131 | unsigned long flags; | |
132 | unsigned long screen_bitmap; | |
133 | unsigned long cpu_type; | |
134 | struct revectored_struct int_revectored; | |
135 | struct revectored_struct int21_revectored; | |
136 | struct vm86plus_info_struct vm86plus; | |
137 | }; | |
138 | ||
139 | #ifdef __KERNEL__ | |
140 | /* | |
141 | * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86 | |
142 | * mode - the main change is that the old segment descriptors aren't | |
143 | * useful any more and are forced to be zero by the kernel (and the | |
144 | * hardware when a trap occurs), and the real segment descriptors are | |
145 | * at the end of the structure. Look at ptrace.h to see the "normal" | |
146 | * setup. For user space layout see 'struct vm86_regs' above. | |
147 | */ | |
49d26b6e | 148 | #include <asm/ptrace.h> |
1da177e4 LT |
149 | |
150 | struct kernel_vm86_regs { | |
151 | /* | |
152 | * normal regs, with special meaning for the segment descriptors.. | |
153 | */ | |
49d26b6e | 154 | struct pt_regs pt; |
1da177e4 LT |
155 | /* |
156 | * these are specific to v86 mode: | |
157 | */ | |
158 | unsigned short es, __esh; | |
159 | unsigned short ds, __dsh; | |
160 | unsigned short fs, __fsh; | |
161 | unsigned short gs, __gsh; | |
162 | }; | |
163 | ||
164 | struct kernel_vm86_struct { | |
165 | struct kernel_vm86_regs regs; | |
166 | /* | |
167 | * the below part remains on the kernel stack while we are in VM86 mode. | |
168 | * 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we | |
169 | * get forced back from VM86, the CPU and "SAVE_ALL" will restore the above | |
170 | * 'struct kernel_vm86_regs' with the then actual values. | |
171 | * Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct' | |
172 | * in kernelspace, hence we need not reget the data from userspace. | |
173 | */ | |
174 | #define VM86_TSS_ESP0 flags | |
175 | unsigned long flags; | |
176 | unsigned long screen_bitmap; | |
177 | unsigned long cpu_type; | |
178 | struct revectored_struct int_revectored; | |
179 | struct revectored_struct int21_revectored; | |
180 | struct vm86plus_info_struct vm86plus; | |
181 | struct pt_regs *regs32; /* here we save the pointer to the old regs */ | |
182 | /* | |
183 | * The below is not part of the structure, but the stack layout continues | |
184 | * this way. In front of 'return-eip' may be some data, depending on | |
185 | * compilation, so we don't rely on this and save the pointer to 'oldregs' | |
186 | * in 'regs32' above. | |
187 | * However, with GCC-2.7.2 and the current CFLAGS you see exactly this: | |
188 | ||
189 | long return-eip; from call to vm86() | |
190 | struct pt_regs oldregs; user space registers as saved by syscall | |
191 | */ | |
192 | }; | |
193 | ||
64ca9004 MM |
194 | #ifdef CONFIG_VM86 |
195 | ||
1da177e4 LT |
196 | void handle_vm86_fault(struct kernel_vm86_regs *, long); |
197 | int handle_vm86_trap(struct kernel_vm86_regs *, long, int); | |
198 | ||
64ca9004 MM |
199 | struct task_struct; |
200 | void release_vm86_irqs(struct task_struct *); | |
201 | ||
202 | #else | |
203 | ||
204 | #define handle_vm86_fault(a, b) | |
205 | #define release_vm86_irqs(a) | |
206 | ||
207 | static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c) { | |
208 | return 0; | |
209 | } | |
210 | ||
211 | #endif /* CONFIG_VM86 */ | |
212 | ||
1da177e4 LT |
213 | #endif /* __KERNEL__ */ |
214 | ||
215 | #endif |