puzzled over settimer

[Gordon McNutt <gmcnutt@ridgerun.com>]

Hi,

I've been reading the code in arch/rtl_time.c. What hardware are the
settimer functions setting up? For example, in the i386 macro :

#define WRITE_COUNTER_ZERO16(x) do { \
 outb(x&0xff,0x40); outb((x>>8)&0xff,0x40);\

I see that the clock init sets up an interrupt handler on the regular
system timer. But I don't see any other interrupt handlers being
established, and was wondering how the system knew when a timer expired.

Thanks,

--Gordon