| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _ASM_X86_VM86_H |
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| 3 | #define _ASM_X86_VM86_H |
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| 4 | |
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| 5 | #include <asm/ptrace.h> |
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| 6 | #include <uapi/asm/vm86.h> |
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| 7 | |
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| 8 | /* |
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| 9 | * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86 |
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| 10 | * mode - the main change is that the old segment descriptors aren't |
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| 11 | * useful any more and are forced to be zero by the kernel (and the |
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| 12 | * hardware when a trap occurs), and the real segment descriptors are |
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| 13 | * at the end of the structure. Look at ptrace.h to see the "normal" |
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| 14 | * setup. For user space layout see 'struct vm86_regs' above. |
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| 15 | */ |
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| 16 | |
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| 17 | struct kernel_vm86_regs { |
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| 18 | /* |
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| 19 | * normal regs, with special meaning for the segment descriptors.. |
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| 20 | */ |
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| 21 | struct pt_regs pt; |
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| 22 | /* |
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| 23 | * these are specific to v86 mode: |
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| 24 | */ |
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| 25 | unsigned short es, __esh; |
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| 26 | unsigned short ds, __dsh; |
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| 27 | unsigned short fs, __fsh; |
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| 28 | unsigned short gs, __gsh; |
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| 29 | }; |
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| 30 | |
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| 31 | struct vm86 { |
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| 32 | struct vm86plus_struct __user *user_vm86; |
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| 33 | struct pt_regs regs32; |
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| 34 | unsigned long veflags; |
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| 35 | unsigned long veflags_mask; |
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| 36 | unsigned long saved_sp0; |
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| 37 | |
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| 38 | unsigned long flags; |
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| 39 | unsigned long cpu_type; |
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| 40 | struct revectored_struct int_revectored; |
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| 41 | struct revectored_struct int21_revectored; |
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| 42 | struct vm86plus_info_struct vm86plus; |
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| 43 | }; |
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| 44 | |
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| 45 | #ifdef CONFIG_VM86 |
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| 46 | |
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| 47 | void handle_vm86_fault(struct kernel_vm86_regs *, long); |
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| 48 | int handle_vm86_trap(struct kernel_vm86_regs *, long, int); |
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| 49 | void save_v86_state(struct kernel_vm86_regs *, int); |
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| 50 | |
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| 51 | struct task_struct; |
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| 52 | |
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| 53 | #define free_vm86(t) do { \ |
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| 54 | struct thread_struct *__t = (t); \ |
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| 55 | if (__t->vm86 != NULL) { \ |
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| 56 | kfree(__t->vm86); \ |
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| 57 | __t->vm86 = NULL; \ |
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| 58 | } \ |
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| 59 | } while (0) |
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| 60 | |
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| 61 | /* |
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| 62 | * Support for VM86 programs to request interrupts for |
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| 63 | * real mode hardware drivers: |
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| 64 | */ |
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| 65 | #define FIRST_VM86_IRQ 3 |
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| 66 | #define LAST_VM86_IRQ 15 |
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| 67 | |
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| 68 | static inline int invalid_vm86_irq(int irq) |
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| 69 | { |
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| 70 | return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ; |
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| 71 | } |
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| 72 | |
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| 73 | void release_vm86_irqs(struct task_struct *); |
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| 74 | |
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| 75 | #else |
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| 76 | |
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| 77 | #define handle_vm86_fault(a, b) |
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| 78 | #define release_vm86_irqs(a) |
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| 79 | |
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| 80 | static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c) |
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| 81 | { |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |
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| 85 | static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { } |
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| 86 | |
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| 87 | #define free_vm86(t) do { } while(0) |
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| 88 | |
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| 89 | #endif /* CONFIG_VM86 */ |
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| 90 | |
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| 91 | #endif /* _ASM_X86_VM86_H */ |
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| 92 | |
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