1 /* SPDX-License-Identifier: GPL-2.0 */ 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 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 */ 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_vm86; 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_revectored; 41 struct revectored_struct int21_revectored; 42 struct vm86plus_info_struct vm86plus; 43 }; 44 45 #ifdef CONFIG_VM86 46 47 void handle_vm86_fault(struct kernel_vm86_regs *, long); 48 int handle_vm86_trap(struct kernel_vm86_regs *, long, int); 49 void save_v86_state(struct kernel_vm86_regs *, int); 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 interrupts for 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 > LAST_VM86_IRQ; 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 kernel_vm86_regs *a, long b, int c) 81 { 82 return 0; 83 } 84 85 static inline void save_v86_state(struct kernel_vm86_regs *a, int b) { } 86 87 #define free_vm86(t) do { } while(0) 88 89 #endif /* CONFIG_VM86 */ 90 91 #endif /* _ASM_X86_VM86_H */ 92