arch/x86/include/asm/vm86.h

   1 #ifndef _ASM_X86_VM86_H
   2 #define _ASM_X86_VM86_H
   3
   4 #include <asm/ptrace.h>
   5 #include <uapi/asm/vm86.h>
   6
   7 /*
   8  * This is the (kernel) stack-layout when we have done a "SAVE_ALL" from vm86
   9  * mode - the main change is that the old segment descriptors aren't
  10  * useful any more and are forced to be zero by the kernel (and the
  11  * hardware when a trap occurs), and the real segment descriptors are
  12  * at the end of the structure. Look at ptrace.h to see the "normal"
  13  * setup. For user space layout see 'struct vm86_regs' above.
  14  */
  15
  16 struct kernel_vm86_regs {
  17 /*
  18  * normal regs, with special meaning for the segment descriptors..
  19  */
  20         struct pt_regs pt;
  21 /*
  22  * these are specific to v86 mode:
  23  */
  24         unsigned short es, __esh;
  25         unsigned short ds, __dsh;
  26         unsigned short fs, __fsh;
  27         unsigned short gs, __gsh;
  28 };
  29
  30 struct vm86 {
  31         struct vm86plus_struct __user *user_vm86;
  32         struct pt_regs regs32;
  33         unsigned long veflags;
  34         unsigned long veflags_mask;
  35         unsigned long saved_sp0;
  36
  37         unsigned long flags;
  38         unsigned long screen_bitmap;
  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 */