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  1. #ifndef _UAPI_ASM_X86_VM86_H
  2. #define _UAPI_ASM_X86_VM86_H
  3.  
  4. /*
  5.  * I'm guessing at the VIF/VIP flag usage, but hope that this is how
  6.  * the Pentium uses them. Linux will return from vm86 mode when both
  7.  * VIF and VIP is set.
  8.  *
  9.  * On a Pentium, we could probably optimize the virtual flags directly
  10.  * in the eflags register instead of doing it "by hand" in vflags...
  11.  *
  12.  * Linus
  13.  */
  14.  
  15. #include <asm/processor-flags.h>
  16.  
  17. #define BIOSSEG         0x0f000
  18.  
  19. #define CPU_086         0
  20. #define CPU_186         1
  21. #define CPU_286         2
  22. #define CPU_386         3
  23. #define CPU_486         4
  24. #define CPU_586         5
  25.  
  26. /*
  27.  * Return values for the 'vm86()' system call
  28.  */
  29. #define VM86_TYPE(retval)       ((retval) & 0xff)
  30. #define VM86_ARG(retval)        ((retval) >> 8)
  31.  
  32. #define VM86_SIGNAL     0       /* return due to signal */
  33. #define VM86_UNKNOWN    1       /* unhandled GP fault
  34.                                    - IO-instruction or similar */
  35. #define VM86_INTx       2       /* int3/int x instruction (ARG = x) */
  36. #define VM86_STI        3       /* sti/popf/iret instruction enabled
  37.                                    virtual interrupts */
  38.  
  39. /*
  40.  * Additional return values when invoking new vm86()
  41.  */
  42. #define VM86_PICRETURN  4       /* return due to pending PIC request */
  43. #define VM86_TRAP       6       /* return due to DOS-debugger request */
  44.  
  45. /*
  46.  * function codes when invoking new vm86()
  47.  */
  48. #define VM86_PLUS_INSTALL_CHECK 0
  49. #define VM86_ENTER              1
  50. #define VM86_ENTER_NO_BYPASS    2
  51. #define VM86_REQUEST_IRQ        3
  52. #define VM86_FREE_IRQ           4
  53. #define VM86_GET_IRQ_BITS       5
  54. #define VM86_GET_AND_RESET_IRQ  6
  55.  
  56. /*
  57.  * This is the stack-layout seen by the user space program when we have
  58.  * done a translation of "SAVE_ALL" from vm86 mode. The real kernel layout
  59.  * is 'kernel_vm86_regs' (see below).
  60.  */
  61.  
  62. struct vm86_regs {
  63. /*
  64.  * normal regs, with special meaning for the segment descriptors..
  65.  */
  66.         long ebx;
  67.         long ecx;
  68.         long edx;
  69.         long esi;
  70.         long edi;
  71.         long ebp;
  72.         long eax;
  73.         long __null_ds;
  74.         long __null_es;
  75.         long __null_fs;
  76.         long __null_gs;
  77.         long orig_eax;
  78.         long eip;
  79.         unsigned short cs, __csh;
  80.         long eflags;
  81.         long esp;
  82.         unsigned short ss, __ssh;
  83. /*
  84.  * these are specific to v86 mode:
  85.  */
  86.         unsigned short es, __esh;
  87.         unsigned short ds, __dsh;
  88.         unsigned short fs, __fsh;
  89.         unsigned short gs, __gsh;
  90. };
  91.  
  92. struct revectored_struct {
  93.         unsigned long __map[8];                 /* 256 bits */
  94. };
  95.  
  96. struct vm86_struct {
  97.         struct vm86_regs regs;
  98.         unsigned long flags;
  99.         unsigned long screen_bitmap;
  100.         unsigned long cpu_type;
  101.         struct revectored_struct int_revectored;
  102.         struct revectored_struct int21_revectored;
  103. };
  104.  
  105. /*
  106.  * flags masks
  107.  */
  108. #define VM86_SCREEN_BITMAP      0x0001
  109.  
  110. struct vm86plus_info_struct {
  111.         unsigned long force_return_for_pic:1;
  112.         unsigned long vm86dbg_active:1;       /* for debugger */
  113.         unsigned long vm86dbg_TFpendig:1;     /* for debugger */
  114.         unsigned long unused:28;
  115.         unsigned long is_vm86pus:1;           /* for vm86 internal use */
  116.         unsigned char vm86dbg_intxxtab[32];   /* for debugger */
  117. };
  118. struct vm86plus_struct {
  119.         struct vm86_regs regs;
  120.         unsigned long flags;
  121.         unsigned long screen_bitmap;
  122.         unsigned long cpu_type;
  123.         struct revectored_struct int_revectored;
  124.         struct revectored_struct int21_revectored;
  125.         struct vm86plus_info_struct vm86plus;
  126. };
  127.  
  128.  
  129. #endif /* _UAPI_ASM_X86_VM86_H */
  130.