/* clock.h */

/* Intel 8254-2 clock chip constants */

#define CLOCKBASE       0x40            /* I/O base port of clock chip  */
#define CLOCK0          CLOCKBASE
#define CLKCNTL         (CLOCKBASE+3)   /* Chip CSW I/O port            */


#define CLKTICKS_PER_SEC  1000          /* Clock timer resolution       */

extern  uint32  clktime;                /* Second since system boot     */
extern  uint32  count1000;              /* Ticks since clktime          */

extern  qid16   sleepq;                 /* Queue for sleeping processes */
extern  uint32  preempt;                /* Preemption counter           */