From 56f335c89e28c488b1bfea3e5e697fce805c784d Mon Sep 17 00:00:00 2001 From: Grant Grundler Date: Sun, 3 Sep 2006 00:02:16 -0700 Subject: [PARISC] Add new function to start local Interval Timer, start_cpu_itimer() I couldn't find where the itimer was getting started for slave CPUs. CPU 0 (master) itimer was started in time_init() (arch/parisc/kernel/time.c). start_cpu_itimer() code was striped from time_init(). Slaves now start their itimer in smp_cpu_init(). This is a first step towards making gettimeoffset() work for SMP. Next step will be to determine the CR16 (cycle counter) offsets for each CPU relative to the master (CPU 0). Signed-off-by: Grant Grundler Signed-off-by: Kyle McMartin --- arch/parisc/kernel/time.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'arch/parisc/kernel/time.c') diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c index ab641d67f55..47831c2cd09 100644 --- a/arch/parisc/kernel/time.c +++ b/arch/parisc/kernel/time.c @@ -223,22 +223,24 @@ unsigned long long sched_clock(void) } +void __init start_cpu_itimer(void) +{ + unsigned int cpu = smp_processor_id(); + unsigned long next_tick = mfctl(16) + clocktick; + + mtctl(next_tick, 16); /* kick off Interval Timer (CR16) */ + + cpu_data[cpu].it_value = next_tick; +} + void __init time_init(void) { - unsigned long next_tick; static struct pdc_tod tod_data; clocktick = (100 * PAGE0->mem_10msec) / HZ; halftick = clocktick / 2; - /* Setup clock interrupt timing */ - - next_tick = mfctl(16); - next_tick += clocktick; - cpu_data[smp_processor_id()].it_value = next_tick; - - /* kick off Itimer (CR16) */ - mtctl(next_tick, 16); + start_cpu_itimer(); /* get CPU 0 started */ if(pdc_tod_read(&tod_data) == 0) { write_seqlock_irq(&xtime_lock); -- cgit v1.2.3