1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef _ASM_X86_VM86_H
3 #define _ASM_X86_VM86_H
4
5 #include <asm/ptrace.h>
6 #include <uapi/asm/vm86.h>
7
8 /*
9 * This is the (kernel) stack-layout when we h
10 * mode - the main change is that the old segm
11 * useful any more and are forced to be zero b
12 * hardware when a trap occurs), and the real
13 * at the end of the structure. Look at ptrace
14 * setup. For user space layout see 'struct vm
15 */
16
17 struct kernel_vm86_regs {
18 /*
19 * normal regs, with special meaning for the s
20 */
21 struct pt_regs pt;
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 vm86 {
32 struct vm86plus_struct __user *user_vm
33 struct pt_regs regs32;
34 unsigned long veflags;
35 unsigned long veflags_mask;
36 unsigned long saved_sp0;
37
38 unsigned long flags;
39 unsigned long cpu_type;
40 struct revectored_struct int_revectore
41 struct revectored_struct int21_revecto
42 struct vm86plus_info_struct vm86plus;
43 };
44
45 #ifdef CONFIG_VM86
46
47 void handle_vm86_fault(struct kernel_vm86_regs
48 int handle_vm86_trap(struct kernel_vm86_regs *
49 void save_v86_state(struct kernel_vm86_regs *,
50
51 struct task_struct;
52
53 #define free_vm86(t) do {
54 struct thread_struct *__t = (t);
55 if (__t->vm86 != NULL) {
56 kfree(__t->vm86);
57 __t->vm86 = NULL;
58 }
59 } while (0)
60
61 /*
62 * Support for VM86 programs to request interr
63 * real mode hardware drivers:
64 */
65 #define FIRST_VM86_IRQ 3
66 #define LAST_VM86_IRQ 15
67
68 static inline int invalid_vm86_irq(int irq)
69 {
70 return irq < FIRST_VM86_IRQ || irq > L
71 }
72
73 void release_vm86_irqs(struct task_struct *);
74
75 #else
76
77 #define handle_vm86_fault(a, b)
78 #define release_vm86_irqs(a)
79
80 static inline int handle_vm86_trap(struct kern
81 {
82 return 0;
83 }
84
85 static inline void save_v86_state(struct kerne
86
87 #define free_vm86(task) do { (void)(task); } w
88
89 #endif /* CONFIG_VM86 */
90
91 #endif /* _ASM_X86_VM86_H */
92
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.