51 lines
952 B
C
51 lines
952 B
C
|
/*
|
||
|
|
** No copyright?!
|
||
|
|
**
|
||
|
|
** $Id: timer.c,v 1.3 1996/09/22 15:42:59 miff Exp $
|
||
|
|
*/
|
||
|
|
#include "doscmd.h"
|
||
|
|
|
||
|
|
static void
|
||
|
|
int08(regcontext_t *REGS)
|
||
|
|
{
|
||
|
|
softint(0x1c);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
int1c(regcontext_t *REGS)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned char timer;
|
||
|
|
|
||
|
|
static u_char
|
||
|
|
inb_timer(int port)
|
||
|
|
{
|
||
|
|
return (--timer);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
timer_init(void)
|
||
|
|
{
|
||
|
|
u_long vec;
|
||
|
|
struct itimerval itv;
|
||
|
|
|
||
|
|
vec = insert_hardint_trampoline();
|
||
|
|
ivec[0x08] = vec;
|
||
|
|
register_callback(vec, int08, "int 08");
|
||
|
|
|
||
|
|
vec = insert_softint_trampoline();
|
||
|
|
ivec[0x1c] = vec;
|
||
|
|
register_callback(vec, int1c, "int 1c");
|
||
|
|
|
||
|
|
define_input_port_handler(0x42, inb_timer);
|
||
|
|
define_input_port_handler(0x40, inb_timer);
|
||
|
|
|
||
|
|
itv.it_interval.tv_sec = 0;
|
||
|
|
itv.it_interval.tv_usec = 54925; /* 1193182/65536 times per second */
|
||
|
|
itv.it_value.tv_sec = 0;
|
||
|
|
itv.it_value.tv_usec = 54925; /* 1193182/65536 times per second */
|
||
|
|
if (! timer_disable)
|
||
|
|
setitimer(ITIMER_REAL, &itv, 0);
|
||
|
|
}
|