/*
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include "linux/kernel.h"
-#include "linux/module.h"
-#include "linux/unistd.h"
-#include "linux/stddef.h"
-#include "linux/spinlock.h"
-#include "linux/time.h"
-#include "linux/sched.h"
+#include "linux/clockchips.h"
#include "linux/interrupt.h"
-#include "linux/init.h"
-#include "linux/delay.h"
-#include "linux/hrtimer.h"
+#include "linux/jiffies.h"
+#include "linux/threads.h"
#include "asm/irq.h"
#include "asm/param.h"
-#include "asm/current.h"
#include "kern_util.h"
-#include "user_util.h"
-#include "mode.h"
#include "os.h"
-int hz(void)
-{
- return(HZ);
-}
-
/*
* Scheduler clock - returns current time in nanosec units.
*/
return (unsigned long long)jiffies_64 * (1000000000 / HZ);
}
-static unsigned long long prev_nsecs[NR_CPUS];
#ifdef CONFIG_UML_REAL_TIME_CLOCK
+static unsigned long long prev_nsecs[NR_CPUS];
static long long delta[NR_CPUS]; /* Deviation per interval */
#endif
-void timer_irq(union uml_pt_regs *regs)
+void timer_handler(int sig, struct uml_pt_regs *regs)
{
unsigned long long ticks = 0;
+ unsigned long flags;
#ifdef CONFIG_UML_REAL_TIME_CLOCK
int c = cpu();
- if(prev_nsecs[c]){
+ if (prev_nsecs[c]) {
/* We've had 1 tick */
unsigned long long nsecs = os_nsecs();
prev_nsecs[c] = nsecs;
/* Protect against the host clock being set backwards */
- if(delta[c] < 0)
+ if (delta[c] < 0)
delta[c] = 0;
ticks += (delta[c] * HZ) / BILLION;
#else
ticks = 1;
#endif
- while(ticks > 0){
+
+ local_irq_save(flags);
+ while (ticks > 0) {
do_IRQ(TIMER_IRQ, regs);
ticks--;
}
+ local_irq_restore(flags);
}
-/* Protects local_offset */
-static DEFINE_SPINLOCK(timer_spinlock);
-static unsigned long long local_offset = 0;
-
-static inline unsigned long long get_time(void)
+static void itimer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
{
- unsigned long long nsecs;
- unsigned long flags;
-
- spin_lock_irqsave(&timer_spinlock, flags);
- nsecs = os_nsecs();
- nsecs += local_offset;
- spin_unlock_irqrestore(&timer_spinlock, flags);
-
- return nsecs;
+ switch(mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ set_interval();
+ break;
+
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_UNUSED:
+ disable_timer();
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ BUG();
+ break;
+
+ case CLOCK_EVT_MODE_RESUME:
+ break;
+ }
}
-irqreturn_t um_timer(int irq, void *dev)
+static struct clock_event_device itimer_clockevent = {
+ .name = "itimer",
+ .rating = 250,
+ .cpumask = CPU_MASK_ALL,
+ .features = CLOCK_EVT_FEAT_PERIODIC,
+ .set_mode = itimer_set_mode,
+ .set_next_event = NULL,
+ .shift = 32,
+ .irq = 0,
+};
+
+static irqreturn_t um_timer(int irq, void *dev)
{
- unsigned long long nsecs;
- unsigned long flags;
-
- write_seqlock_irqsave(&xtime_lock, flags);
-
- do_timer(1);
-
- nsecs = get_time();
- xtime.tv_sec = nsecs / NSEC_PER_SEC;
- xtime.tv_nsec = nsecs - xtime.tv_sec * NSEC_PER_SEC;
-
- write_sequnlock_irqrestore(&xtime_lock, flags);
+ (*itimer_clockevent.event_handler)(&itimer_clockevent);
return IRQ_HANDLED;
}
-static void register_timer(void)
+static void __init setup_itimer(void)
{
int err;
err = request_irq(TIMER_IRQ, um_timer, IRQF_DISABLED, "timer", NULL);
- if(err != 0)
+ if (err != 0)
printk(KERN_ERR "register_timer : request_irq failed - "
"errno = %d\n", -err);
- err = set_interval(1);
- if(err != 0)
- printk(KERN_ERR "register_timer : set_interval failed - "
- "errno = %d\n", -err);
+ itimer_clockevent.mult = div_sc(HZ, NSEC_PER_SEC, 32);
+ itimer_clockevent.max_delta_ns =
+ clockevent_delta2ns(60 * HZ, &itimer_clockevent);
+ itimer_clockevent.min_delta_ns =
+ clockevent_delta2ns(1, &itimer_clockevent);
+ clockevents_register_device(&itimer_clockevent);
}
extern void (*late_time_init)(void);
-void time_init(void)
+void __init time_init(void)
{
long long nsecs;
+ timer_init();
+
nsecs = os_nsecs();
set_normalized_timespec(&wall_to_monotonic, -nsecs / BILLION,
-nsecs % BILLION);
- late_time_init = register_timer;
-}
-
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long long nsecs = get_time();
-
- tv->tv_sec = nsecs / NSEC_PER_SEC;
- /* Careful about calculations here - this was originally done as
- * (nsecs - tv->tv_sec * NSEC_PER_SEC) / NSEC_PER_USEC
- * which gave bogus (> 1000000) values. Dunno why, suspect gcc
- * (4.0.0) miscompiled it, or there's a subtle 64/32-bit conversion
- * problem that I missed.
- */
- nsecs -= tv->tv_sec * NSEC_PER_SEC;
- tv->tv_usec = (unsigned long) nsecs / NSEC_PER_USEC;
-}
-
-static inline void set_time(unsigned long long nsecs)
-{
- unsigned long long now;
- unsigned long flags;
-
- spin_lock_irqsave(&timer_spinlock, flags);
- now = os_nsecs();
- local_offset = nsecs - now;
- spin_unlock_irqrestore(&timer_spinlock, flags);
-
- clock_was_set();
-}
-
-int do_settimeofday(struct timespec *tv)
-{
- set_time((unsigned long long) tv->tv_sec * NSEC_PER_SEC + tv->tv_nsec);
-
- return 0;
-}
-
-void timer_handler(int sig, union uml_pt_regs *regs)
-{
- local_irq_disable();
- irq_enter();
- update_process_times(CHOOSE_MODE(
- (UPT_SC(regs) && user_context(UPT_SP(regs))),
- (regs)->skas.is_user));
- irq_exit();
- local_irq_enable();
- if(current_thread->cpu == 0)
- timer_irq(regs);
+ set_normalized_timespec(&xtime, nsecs / BILLION, nsecs % BILLION);
+ late_time_init = setup_itimer;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff