#include <asm/i8259.h>
-int pit_latch_buggy; /* extern */
-
#include "do_timer.h"
unsigned int cpu_khz; /* Detected as we calibrate the TSC */
unsigned long pc = instruction_pointer(regs);
#ifdef CONFIG_SMP
- if (!user_mode_vm(regs) && in_lock_functions(pc)) {
+ if (!v8086_mode(regs) && SEGMENT_IS_KERNEL_CODE(regs->xcs) &&
+ in_lock_functions(pc)) {
#ifdef CONFIG_FRAME_POINTER
return *(unsigned long *)(regs->ebp + 4);
#else
- unsigned long *sp;
- if ((regs->xcs & 3) == 0)
- sp = (unsigned long *)®s->esp;
- else
- sp = (unsigned long *)regs->esp;
+ unsigned long *sp = (unsigned long *)®s->esp;
+
/* Return address is either directly at stack pointer
or above a saved eflags. Eflags has bits 22-31 zero,
kernel addresses don't. */
*/
irqreturn_t timer_interrupt(int irq, void *dev_id)
{
- /*
- * Here we are in the timer irq handler. We just have irqs locally
- * disabled but we don't know if the timer_bh is running on the other
- * CPU. We need to avoid to SMP race with it. NOTE: we don' t need
- * the irq version of write_lock because as just said we have irq
- * locally disabled. -arca
- */
- write_seqlock(&xtime_lock);
-
#ifdef CONFIG_X86_IO_APIC
if (timer_ack) {
/*
do_timer_interrupt_hook();
-
if (MCA_bus) {
/* The PS/2 uses level-triggered interrupts. You can't
turn them off, nor would you want to (any attempt to
outb_p( irq_v|0x80, 0x61 ); /* reset the IRQ */
}
- write_sequnlock(&xtime_lock);
-
-#ifdef CONFIG_X86_LOCAL_APIC
- if (using_apic_timer)
- smp_send_timer_broadcast_ipi();
-#endif
-
return IRQ_HANDLED;
}
/* not static: needed by APM */
-unsigned long get_cmos_time(void)
+unsigned long read_persistent_clock(void)
{
unsigned long retval;
unsigned long flags;
return retval;
}
-EXPORT_SYMBOL(get_cmos_time);
static void sync_cmos_clock(unsigned long dummy);
static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+int no_sync_cmos_clock;
static void sync_cmos_clock(unsigned long dummy)
{
void notify_arch_cmos_timer(void)
{
- mod_timer(&sync_cmos_timer, jiffies + 1);
-}
-
-static long clock_cmos_diff;
-static unsigned long sleep_start;
-
-static int timer_suspend(struct sys_device *dev, pm_message_t state)
-{
- /*
- * Estimate time zone so that set_time can update the clock
- */
- unsigned long ctime = get_cmos_time();
-
- clock_cmos_diff = -ctime;
- clock_cmos_diff += get_seconds();
- sleep_start = ctime;
- return 0;
-}
-
-static int timer_resume(struct sys_device *dev)
-{
- unsigned long flags;
- unsigned long sec;
- unsigned long ctime = get_cmos_time();
- long sleep_length = (ctime - sleep_start) * HZ;
- struct timespec ts;
-
- if (sleep_length < 0) {
- printk(KERN_WARNING "CMOS clock skew detected in timer resume!\n");
- /* The time after the resume must not be earlier than the time
- * before the suspend or some nasty things will happen
- */
- sleep_length = 0;
- ctime = sleep_start;
- }
-#ifdef CONFIG_HPET_TIMER
- if (is_hpet_enabled())
- hpet_reenable();
-#endif
- setup_pit_timer();
-
- sec = ctime + clock_cmos_diff;
- ts.tv_sec = sec;
- ts.tv_nsec = 0;
- do_settimeofday(&ts);
- write_seqlock_irqsave(&xtime_lock, flags);
- jiffies_64 += sleep_length;
- write_sequnlock_irqrestore(&xtime_lock, flags);
- touch_softlockup_watchdog();
- return 0;
+ if (!no_sync_cmos_clock)
+ mod_timer(&sync_cmos_timer, jiffies + 1);
}
-static struct sysdev_class timer_sysclass = {
- .resume = timer_resume,
- .suspend = timer_suspend,
- set_kset_name("timer"),
-};
-
-
-/* XXX this driverfs stuff should probably go elsewhere later -john */
-static struct sys_device device_timer = {
- .id = 0,
- .cls = &timer_sysclass,
-};
-
-static int time_init_device(void)
-{
- int error = sysdev_class_register(&timer_sysclass);
- if (!error)
- error = sysdev_register(&device_timer);
- return error;
-}
-
-device_initcall(time_init_device);
-
-#ifdef CONFIG_HPET_TIMER
extern void (*late_time_init)(void);
/* Duplicate of time_init() below, with hpet_enable part added */
-static void __init hpet_time_init(void)
+void __init hpet_time_init(void)
{
- struct timespec ts;
- ts.tv_sec = get_cmos_time();
- ts.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
-
- do_settimeofday(&ts);
-
- if ((hpet_enable() >= 0) && hpet_use_timer) {
- printk("Using HPET for base-timer\n");
- }
-
- do_time_init();
+ if (!hpet_enable())
+ setup_pit_timer();
+ time_init_hook();
}
-#endif
+/*
+ * This is called directly from init code; we must delay timer setup in the
+ * HPET case as we can't make the decision to turn on HPET this early in the
+ * boot process.
+ *
+ * The chosen time_init function will usually be hpet_time_init, above, but
+ * in the case of virtual hardware, an alternative function may be substituted.
+ */
void __init time_init(void)
{
- struct timespec ts;
-#ifdef CONFIG_HPET_TIMER
- if (is_hpet_capable()) {
- /*
- * HPET initialization needs to do memory-mapped io. So, let
- * us do a late initialization after mem_init().
- */
- late_time_init = hpet_time_init;
- return;
- }
-#endif
- ts.tv_sec = get_cmos_time();
- ts.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
-
- do_settimeofday(&ts);
-
- do_time_init();
+ tsc_init();
+ late_time_init = choose_time_init();
}
projects / linux-drm-fsl-dcu.git / blobdiff