compilers/linux86-0.16.17/libc/include/linux/vm86.h

   1 #if !__AS386_16__
   2
   3 #ifndef _SYS_VM86_H
   4 #define _SYS_VM86_H
   5
   6 #include <features.h>
   7 #ifndef _LINUX_VM86_H
   8 #define _LINUX_VM86_H
   9
  10 /*
  11  * I'm guessing at the VIF/VIP flag usage, but hope that this is how
  12  * the Pentium uses them. Linux will return from vm86 mode when both
  13  * VIF and VIP is set.
  14  *
  15  * On a Pentium, we could probably optimize the virtual flags directly
  16  * in the eflags register instead of doing it "by hand" in vflags...
  17  *
  18  * Linus
  19  */
  20
  21 #define TF_MASK         0x00000100
  22 #define IF_MASK         0x00000200
  23 #define IOPL_MASK       0x00003000
  24 #define NT_MASK         0x00004000
  25 #define VM_MASK         0x00020000
  26 #define AC_MASK         0x00040000
  27 #define VIF_MASK        0x00080000      /* virtual interrupt flag */
  28 #define VIP_MASK        0x00100000      /* virtual interrupt pending */
  29 #define ID_MASK         0x00200000
  30
  31 #define BIOSSEG         0x0f000
  32
  33 #define CPU_086         0
  34 #define CPU_186         1
  35 #define CPU_286         2
  36 #define CPU_386         3
  37 #define CPU_486         4
  38 #define CPU_586         5
  39
  40 /*
  41  * Return values for the 'vm86()' system call
  42  */
  43 #define VM86_TYPE(retval)       ((retval) & 0xff)
  44 #define VM86_ARG(retval)        ((retval) >> 8)
  45
  46 #define VM86_SIGNAL     0       /* return due to signal */
  47 #define VM86_UNKNOWN    1       /* unhandled GP fault - IO-instruction or similar */
  48 #define VM86_INTx       2       /* int3/int x instruction (ARG = x) */
  49 #define VM86_STI        3       /* sti/popf/iret instruction enabled virtual interrupts */
  50
  51 /*
  52  * This is the stack-layout when we have done a "SAVE_ALL" from vm86
  53  * mode - the main change is that the old segment descriptors aren't
  54  * useful any more and are forced to be zero by the kernel (and the
  55  * hardware when a trap occurs), and the real segment descriptors are
  56  * at the end of the structure. Look at ptrace.h to see the "normal"
  57  * setup.
  58  */
  59
  60 struct vm86_regs {
  61 /*
  62  * normal regs, with special meaning for the segment descriptors..
  63  */
  64         long ebx;
  65         long ecx;
  66         long edx;
  67         long esi;
  68         long edi;
  69         long ebp;
  70         long eax;
  71         long __null_ds;
  72         long __null_es;
  73         long __null_fs;
  74         long __null_gs;
  75         long orig_eax;
  76         long eip;
  77         unsigned short cs, __csh;
  78         long eflags;
  79         long esp;
  80         unsigned short ss, __ssh;
  81 /*
  82  * these are specific to v86 mode:
  83  */
  84         unsigned short es, __esh;
  85         unsigned short ds, __dsh;
  86         unsigned short fs, __fsh;
  87         unsigned short gs, __gsh;
  88 };
  89
  90 struct revectored_struct {
  91         unsigned long __map[8];                 /* 256 bits */
  92 };
  93
  94 struct vm86_struct {
  95         struct vm86_regs regs;
  96         unsigned long flags;
  97         unsigned long screen_bitmap;
  98         unsigned long cpu_type;
  99         struct revectored_struct int_revectored;
 100         struct revectored_struct int21_revectored;
 101 };
 102
 103 /*
 104  * flags masks
 105  */
 106 #define VM86_SCREEN_BITMAP      0x0001
 107
 108 #ifdef __KERNEL__
 109
 110 void handle_vm86_fault(struct vm86_regs *, long);
 111 void handle_vm86_debug(struct vm86_regs *, long);
 112
 113 #endif
 114
 115 #endif
 116
 117 __BEGIN_DECLS
 118
 119 extern vm86(struct vm86_struct * __info);
 120
 121 __END_DECLS
 122
 123 #endif /*_SYS_VM86_H */
 124
 125 #endif