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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_VM86_H |
3 | #define _ASM_X86_VM86_H | |
1da177e4 | 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 | ||
9fda6a06 | 31 | struct vm86 { |
13426356 | 32 | struct vm86plus_struct __user *user_vm86; |
5ed92a8a | 33 | struct pt_regs regs32; |
decd275e BG |
34 | unsigned long veflags; |
35 | unsigned long veflags_mask; | |
9fda6a06 | 36 | unsigned long saved_sp0; |
d4ce0f26 BG |
37 | |
38 | unsigned long flags; | |
39 | unsigned long screen_bitmap; | |
40 | unsigned long cpu_type; | |
41 | struct revectored_struct int_revectored; | |
42 | struct revectored_struct int21_revectored; | |
43 | struct vm86plus_info_struct vm86plus; | |
9fda6a06 BG |
44 | }; |
45 | ||
64ca9004 MM |
46 | #ifdef CONFIG_VM86 |
47 | ||
1da177e4 LT |
48 | void handle_vm86_fault(struct kernel_vm86_regs *, long); |
49 | int handle_vm86_trap(struct kernel_vm86_regs *, long, int); | |
5ed92a8a | 50 | void save_v86_state(struct kernel_vm86_regs *, int); |
1da177e4 | 51 | |
64ca9004 | 52 | struct task_struct; |
64ca9004 | 53 | |
9fda6a06 BG |
54 | #define free_vm86(t) do { \ |
55 | struct thread_struct *__t = (t); \ | |
56 | if (__t->vm86 != NULL) { \ | |
57 | kfree(__t->vm86); \ | |
58 | __t->vm86 = NULL; \ | |
59 | } \ | |
60 | } while (0) | |
61 | ||
af3e565a IM |
62 | /* |
63 | * Support for VM86 programs to request interrupts for | |
64 | * real mode hardware drivers: | |
65 | */ | |
66 | #define FIRST_VM86_IRQ 3 | |
67 | #define LAST_VM86_IRQ 15 | |
68 | ||
69 | static inline int invalid_vm86_irq(int irq) | |
70 | { | |
71 | return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ; | |
72 | } | |
73 | ||
74 | void release_vm86_irqs(struct task_struct *); | |
75 | ||
64ca9004 MM |
76 | #else |
77 | ||
78 | #define handle_vm86_fault(a, b) | |
79 | #define release_vm86_irqs(a) | |
80 | ||
9e8a935b JP |
81 | static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c) |
82 | { | |
64ca9004 MM |
83 | return 0; |
84 | } | |
85 | ||
5ed92a8a BG |
86 | static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { } |
87 | ||
9fda6a06 BG |
88 | #define free_vm86(t) do { } while(0) |
89 | ||
64ca9004 MM |
90 | #endif /* CONFIG_VM86 */ |
91 | ||
1965aae3 | 92 | #endif /* _ASM_X86_VM86_H */ |