4 * $FreeBSD: src/usr.bin/doscmd/timer.c,v 1.2.2.2 2002/04/25 11:04:51 tg Exp $
5 * $DragonFly: src/usr.bin/doscmd/timer.c,v 1.2 2003/06/17 04:29:26 dillon Exp $
10 int08(regcontext_t *REGS __unused)
12 *(u_long *)&BIOSDATA[0x6c] += 1; /* ticks since midnight */
13 while (*(u_long *)&BIOSDATA[0x6c] >= 24*60*6*182) {
14 *(u_long *)&BIOSDATA[0x6c] -= 24*60*6*182;
15 BIOSDATA[0x70]++; /* # times past mn */
17 /* What is the real BIOS' sequence? */
23 int1c(regcontext_t *REGS __unused)
30 inb_timer(int port __unused)
45 vec = insert_hardint_trampoline();
47 register_callback(vec, int08, "int 08");
49 vec = insert_softint_trampoline();
51 register_callback(vec, int1c, "int 1c");
53 define_input_port_handler(0x42, inb_timer);
54 define_input_port_handler(0x40, inb_timer);
56 /* Initialize time counter BIOS variable. */
57 gettimeofday(&tv, &tz);
59 tm = *localtime(&tv_sec);
60 *(u_long *)&BIOSDATA[0x6c] =
61 (((tm.tm_hour * 60 + tm.tm_min) * 60) + tm.tm_sec) * 182 / 10;
63 itv.it_interval.tv_sec = 0;
64 itv.it_interval.tv_usec = 54925; /* 1193182/65536 times per second */
65 itv.it_value.tv_sec = 0;
66 itv.it_value.tv_usec = 54925; /* 1193182/65536 times per second */
68 setitimer(ITIMER_REAL, &itv, 0);