#ifndef _DRIVER_H_c1045258_
#define _DRIVER_H_c1045258_

/* This file is in the public domain. */

#include "pdp11.h"

typedef struct intrq INTRQ;
typedef struct driver DRIVER;

struct intrq {
  DRIVER *driver;
  word vec;
  word pri;
  int flags;
#define IRQ_F_ACTIVE 1
  INTRQ *pri_link;
  } ;

struct driver {
  int flags;
#define DVR_NORMW 0x00000001
  const char *name;
  void (*init)(DRIVER *, char *);
  void (*tick)(DRIVER *);
  int (*io)(DRIVER *, int, int, int, void (*)(void *));
  void (*busreset)(DRIVER *);
  void (*reset)(DRIVER *);
  int (*intchk)(INTRQ *);
  void (*intack)(INTRQ *);
  DRIVER *link;
  INTRQ irq[8];
  char iomask[8192];
  } ;

#define IOMASK(n) (017777&(word)(n))

#define IO_OP   0x0f
#define IO_BITS 0xf0
#define IO_R    0x01
#define IO_W    0x02
#define IO_RMW  0x03
#define IO_BYTE 0x10

#define BR4 4
#define BR5 5
#define BR6 6
#define BR7 7

extern void interrupt(DRIVER *, int, int);
extern int reg_access(int, word *, int, word, word);

#define UNUSED(x) x __attribute__((__unused__))

#endif