include/linux/vm86.h

/* */
   1 #ifndef _LINUX_VM86_H
   2 #define _LINUX_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 #define TF_MASK         0x00000100
  16 #define IF_MASK         0x00000200
  17 #define IOPL_MASK       0x00003000
  18 #define NT_MASK         0x00004000
  19 #define VM_MASK         0x00020000
  20 #define AC_MASK         0x00040000
  21 #define VIF_MASK        0x00080000      /* virtual interrupt flag */
  22 #define VIP_MASK        0x00100000      /* virtual interrupt pending */
  23 #define ID_MASK         0x00200000
  24 
  25 #define BIOSSEG         0x0f000
  26 
  27 #define CPU_086         0
  28 #define CPU_186         1
  29 #define CPU_286         2
  30 #define CPU_386         3
  31 #define CPU_486         4
  32 #define CPU_586         5
  33 
  34 /*
  35  * Return values for the 'vm86()' system call
  36  */
  37 #define VM86_TYPE(retval)       ((retval) & 0xff)
  38 #define VM86_ARG(retval)        ((retval) >> 8)
  39 
  40 #define VM86_SIGNAL     0       /* return due to signal */
  41 #define VM86_UNKNOWN    1       /* unhandled GP fault - IO-instruction or similar */
  42 #define VM86_INTx       2       /* int3/int x instruction (ARG = x) */
  43 #define VM86_STI        3       /* sti/popf/iret instruction enabled virtual interrupts */
  44 
  45 /*
  46  * This is the stack-layout when we have done a "SAVE_ALL" from vm86
  47  * mode - the main change is that the old segment descriptors aren't
  48  * useful any more and are forced to be zero by the kernel (and the
  49  * hardware when a trap occurs), and the real segment descriptors are
  50  * at the end of the structure. Look at ptrace.h to see the "normal"
  51  * setup.
  52  */
  53 
  54 struct vm86_regs {
  55 /*
  56  * normal regs, with special meaning for the segment descriptors..
  57  */
  58         long ebx;
  59         long ecx;
  60         long edx;
  61         long esi;
  62         long edi;
  63         long ebp;
  64         long eax;
  65         long __null_ds;
  66         long __null_es;
  67         long __null_fs;
  68         long __null_gs;
  69         long orig_eax;
  70         long eip;
  71         unsigned short cs, __csh;
  72         long eflags;
  73         long esp;
  74         unsigned short ss, __ssh;
  75 /*
  76  * these are specific to v86 mode:
  77  */
  78         unsigned short es, __esh;
  79         unsigned short ds, __dsh;
  80         unsigned short fs, __fsh;
  81         unsigned short gs, __gsh;
  82 };
  83 
  84 struct revectored_struct {
  85         unsigned long __map[8];                 /* 256 bits */
  86 };
  87 
  88 struct vm86_struct {
  89         struct vm86_regs regs;
  90         unsigned long flags;
  91         unsigned long screen_bitmap;
  92         unsigned long cpu_type;
  93         struct revectored_struct int_revectored;
  94         struct revectored_struct int21_revectored;
  95 };
  96 
  97 /*
  98  * flags masks
  99  */
 100 #define VM86_SCREEN_BITMAP      0x0001
 101 
 102 #ifdef __KERNEL__
 103 
 104 void handle_vm86_fault(struct vm86_regs *, long);
 105 void handle_vm86_debug(struct vm86_regs *, long);
 106 
 107 #endif
 108 
 109 #endif
/* */
root/include/linux/vm86.h

INCLUDED FROM
