include/arch/i386/int86.h

   1 /*      int86.h - 8086 interrupt types                  Author: Kees J. Bot
   2  *                                                              3 May 2000
   3  */
   4
   5 /* Registers used in an PC real mode call for BIOS or DOS services.  A
   6  * driver is called through the vector if the interrupt number is zero.
   7  */
   8 union reg86 {
   9     struct l {
  10         u32_t   ef;                     /* 32 bit flags (output only) */
  11         u32_t   vec;                    /* Driver vector (input only) */
  12         u32_t   _ds_es[1];
  13         u32_t   eax;                    /* 32 bit general registers */
  14         u32_t   ebx;
  15         u32_t   ecx;
  16         u32_t   edx;
  17         u32_t   esi;
  18         u32_t   edi;
  19         u32_t   ebp;
  20     } l;
  21     struct w {
  22         u16_t   f, _ef[1];              /* 16 bit flags (output only) */
  23         u16_t   off, seg;               /* Driver vector (input only) */
  24         u16_t   ds, es;                 /* DS and ES real mode segment regs */
  25         u16_t   ax, _eax[1];            /* 16 bit general registers */
  26         u16_t   bx, _ebx[1];
  27         u16_t   cx, _ecx[1];
  28         u16_t   dx, _edx[1];
  29         u16_t   si, _esi[1];
  30         u16_t   di, _edi[1];
  31         u16_t   bp, _ebp[1];
  32     } w;
  33     struct b {
  34         u8_t    intno, _intno[3];       /* Interrupt number (input only) */
  35         u8_t    _vec[4];
  36         u8_t    _ds_es[4];
  37         u8_t    al, ah, _eax[2];        /* 8 bit general registers */
  38         u8_t    bl, bh, _ebx[2];
  39         u8_t    cl, ch, _ecx[2];
  40         u8_t    dl, dh, _edx[2];
  41         u8_t    _esi[4];
  42         u8_t    _edi[4];
  43         u8_t    _ebp[4];
  44     } b;
  45 };
  46
  47 struct reg86u { union reg86 u; };       /* Better for forward declarations */
  48
  49 /* Parameters passed on ioctls to the memory task. */
  50
  51 struct mio_int86 {              /* MIOCINT86 */
  52         union reg86 reg86;              /* x86 registers as above */
  53         u16_t   off, seg;               /* Address of kernel buffer */
  54         void    *buf;                   /* User data buffer */
  55         size_t  len;                    /* Size of user buffer */
  56 };
  57
  58 struct mio_ldt86 {              /* MIOCGLDT86, MIOCSLDT86 */
  59         size_t  idx;                    /* Index in process' LDT */
  60         u16_t   entry[4];               /* One LDT entry to get or set. */
  61 };