source: branches/minix3-book/include/ibm/int86.h@ 9

/*      int86.h - 8086 interrupt types                  Author: Kees J. Bot
 *                                                              3 May 2000
 */

/* Registers used in an PC real mode call for BIOS or DOS services.  A
 * driver is called through the vector if the interrupt number is zero.
 */
union reg86 {
    struct l {
        u32_t   ef;                     /* 32 bit flags (output only) */
        u32_t   vec;                    /* Driver vector (input only) */
        u32_t   _ds_es[1];
        u32_t   eax;                    /* 32 bit general registers */
        u32_t   ebx;
        u32_t   ecx;
        u32_t   edx;
        u32_t   esi;
        u32_t   edi;
        u32_t   ebp;
    } l;
    struct w {
        u16_t   f, _ef[1];              /* 16 bit flags (output only) */
        u16_t   off, seg;               /* Driver vector (input only) */
        u16_t   ds, es;                 /* DS and ES real mode segment regs */
        u16_t   ax, _eax[1];            /* 16 bit general registers */
        u16_t   bx, _ebx[1];
        u16_t   cx, _ecx[1];
        u16_t   dx, _edx[1];
        u16_t   si, _esi[1];
        u16_t   di, _edi[1];
        u16_t   bp, _ebp[1];
    } w;
    struct b {
        u8_t    intno, _intno[3];       /* Interrupt number (input only) */
        u8_t    _vec[4];
        u8_t    _ds_es[4];
        u8_t    al, ah, _eax[2];        /* 8 bit general registers */
        u8_t    bl, bh, _ebx[2];
        u8_t    cl, ch, _ecx[2];
        u8_t    dl, dh, _edx[2];
        u8_t    _esi[4];
        u8_t    _edi[4];
        u8_t    _ebp[4];
    } b;
};

struct reg86u { union reg86 u; };       /* Better for forward declarations */

/* Parameters passed on ioctls to the memory task. */

struct mio_int86 {              /* MIOCINT86 */
        union reg86 reg86;              /* x86 registers as above */
        u16_t   off, seg;               /* Address of kernel buffer */
        void    *buf;                   /* User data buffer */
        size_t  len;                    /* Size of user buffer */
};

struct mio_ldt86 {              /* MIOCGLDT86, MIOCSLDT86 */
        size_t  idx;                    /* Index in process' LDT */
        u16_t   entry[4];               /* One LDT entry to get or set. */
};