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1965aae3 PA |
1 | #ifndef _ASM_X86_VM86_H |
2 | #define _ASM_X86_VM86_H | |
1da177e4 | 3 | |
9831bfb2 | 4 | |
6330a30a | 5 | #include <asm/ptrace.h> |
af170c50 | 6 | #include <uapi/asm/vm86.h> |
9831bfb2 | 7 | |
1da177e4 LT |
8 | /* |
9 | * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86 | |
10 | * mode - the main change is that the old segment descriptors aren't | |
11 | * useful any more and are forced to be zero by the kernel (and the | |
12 | * hardware when a trap occurs), and the real segment descriptors are | |
13 | * at the end of the structure. Look at ptrace.h to see the "normal" | |
14 | * setup. For user space layout see 'struct vm86_regs' above. | |
15 | */ | |
16 | ||
17 | struct kernel_vm86_regs { | |
18 | /* | |
19 | * normal regs, with special meaning for the segment descriptors.. | |
20 | */ | |
49d26b6e | 21 | struct pt_regs pt; |
1da177e4 LT |
22 | /* |
23 | * these are specific to v86 mode: | |
24 | */ | |
25 | unsigned short es, __esh; | |
26 | unsigned short ds, __dsh; | |
27 | unsigned short fs, __fsh; | |
28 | unsigned short gs, __gsh; | |
29 | }; | |
30 | ||
31 | struct kernel_vm86_struct { | |
32 | struct kernel_vm86_regs regs; | |
33 | /* | |
34 | * the below part remains on the kernel stack while we are in VM86 mode. | |
35 | * 'tss.esp0' then contains the address of VM86_TSS_ESP0 below, and when we | |
36 | * get forced back from VM86, the CPU and "SAVE_ALL" will restore the above | |
37 | * 'struct kernel_vm86_regs' with the then actual values. | |
38 | * Therefore, pt_regs in fact points to a complete 'kernel_vm86_struct' | |
39 | * in kernelspace, hence we need not reget the data from userspace. | |
40 | */ | |
41 | #define VM86_TSS_ESP0 flags | |
42 | unsigned long flags; | |
43 | unsigned long screen_bitmap; | |
44 | unsigned long cpu_type; | |
45 | struct revectored_struct int_revectored; | |
46 | struct revectored_struct int21_revectored; | |
47 | struct vm86plus_info_struct vm86plus; | |
48 | struct pt_regs *regs32; /* here we save the pointer to the old regs */ | |
49 | /* | |
50 | * The below is not part of the structure, but the stack layout continues | |
51 | * this way. In front of 'return-eip' may be some data, depending on | |
52 | * compilation, so we don't rely on this and save the pointer to 'oldregs' | |
53 | * in 'regs32' above. | |
54 | * However, with GCC-2.7.2 and the current CFLAGS you see exactly this: | |
55 | ||
56 | long return-eip; from call to vm86() | |
57 | struct pt_regs oldregs; user space registers as saved by syscall | |
58 | */ | |
59 | }; | |
60 | ||
64ca9004 MM |
61 | #ifdef CONFIG_VM86 |
62 | ||
1da177e4 LT |
63 | void handle_vm86_fault(struct kernel_vm86_regs *, long); |
64 | int handle_vm86_trap(struct kernel_vm86_regs *, long, int); | |
e04f99c9 | 65 | struct pt_regs *save_v86_state(struct kernel_vm86_regs *); |
1da177e4 | 66 | |
64ca9004 MM |
67 | struct task_struct; |
68 | void release_vm86_irqs(struct task_struct *); | |
69 | ||
70 | #else | |
71 | ||
72 | #define handle_vm86_fault(a, b) | |
73 | #define release_vm86_irqs(a) | |
74 | ||
9e8a935b JP |
75 | static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c) |
76 | { | |
64ca9004 MM |
77 | return 0; |
78 | } | |
79 | ||
80 | #endif /* CONFIG_VM86 */ | |
81 | ||
1965aae3 | 82 | #endif /* _ASM_X86_VM86_H */ |