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 <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
static void __init
smp_cpu_init(int cpunum)
{
static void __init
smp_cpu_init(int cpunum)
{
- extern int init_per_cpu(int); /* arch/parisc/kernel/setup.c */
+ extern int init_per_cpu(int); /* arch/parisc/kernel/processor.c */
extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */
extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */
+ extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */
/* Set modes and Enable floating point coprocessor */
(void) init_per_cpu(cpunum);
/* Set modes and Enable floating point coprocessor */
(void) init_per_cpu(cpunum);
enter_lazy_tlb(&init_mm, current);
init_IRQ(); /* make sure no IRQ's are enabled or pending */
enter_lazy_tlb(&init_mm, current);
init_IRQ(); /* make sure no IRQ's are enabled or pending */
+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)
{
void __init time_init(void)
{
- unsigned long next_tick;
static struct pdc_tod tod_data;
clocktick = (100 * PAGE0->mem_10msec) / HZ;
halftick = clocktick / 2;
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);
if(pdc_tod_read(&tod_data) == 0) {
write_seqlock_irq(&xtime_lock);