1991/0822/pc/clock.c (diff list | history)

1991/0808/sys/src/9/pc/clock.c:94,130 – 1991/0822/sys/src/9/pc/clock.c:94,96 (short | long | prev | next)
1991/0802		} }
1991/0808		}                  /* * a faster (1 MS) clock tick for a non-interrupting serial port or * kernel profiling. m->ticks still increments as usual. */ void fclock(Ureg *ur) { static ulong ticks;                  uartintr0(ur); /* poll the serial port */ if((ticks++ % (FHZ/HZ)) == 0) clock(ur); }                  void fclockinit(void) { int x;                  /* * set vector for clock interrupts */ setvec(Clockvec, fclock);                  /* * make clock output a square wave with a 1/FHZ period */ x = splhi(); outb(Tmode, Load0square); outb(T0cntr, (Freq/FHZ)); /* low byte */ outb(T0cntr, (Freq/FHZ)>>8); /* high byte */ splx(x);
1991/0705		}