Messages in this thread | | | Subject | Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt | From | Lee Revell <> | Date | Sat, 16 Jul 2005 22:35:24 -0400 |
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On Sun, 2005-07-17 at 04:13 +0200, Jesper Juhl wrote: > Where do we actually program the tick rate we want? >
In arch/i386/kernel/timers/timer_pit.c:
166 void setup_pit_timer(void) 167 { 168 unsigned long flags; 169 170 spin_lock_irqsave(&i8253_lock, flags); 171 outb_p(0x34,PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ 172 udelay(10); 173 outb_p(LATCH & 0xff , PIT_CH0); /* LSB */ 174 udelay(10); 175 outb(LATCH >> 8 , PIT_CH0); /* MSB */ 176 spin_unlock_irqrestore(&i8253_lock, flags); 177 } 178
Lee
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