unsigned long t;
unsigned long x;
t = get_cycles_sync();
- if (t < vxtime.last_tsc)
- t = vxtime.last_tsc; /* hack */
+ if (t < vxtime.last_tsc) t = vxtime.last_tsc; /* hack */
x = ((t - vxtime.last_tsc) * vxtime.tsc_quot) >> 32;
return x;
}
{
unsigned long pc = instruction_pointer(regs);
- /* Assume the lock function has either no stack frame or only a single
- word. This checks if the address on the stack looks like a kernel
- text address.
+ /* Assume the lock function has either no stack frame or only a single word.
+ This checks if the address on the stack looks like a kernel text address.
There is a small window for false hits, but in that case the tick
is just accounted to the spinlock function.
Better would be to write these functions in assembler again
real_minutes += 30; /* correct for half hour time zone */
real_minutes %= 60;
+#if 0
+ /* AMD 8111 is a really bad time keeper and hits this regularly.
+ It probably was an attempt to avoid screwing up DST, but ignore
+ that for now. */
if (abs(real_minutes - cmos_minutes) >= 30) {
printk(KERN_WARNING "time.c: can't update CMOS clock "
"from %d to %d\n", cmos_minutes, real_minutes);
- } else {
+ } else
+#endif
+
+ {
BIN_TO_BCD(real_seconds);
BIN_TO_BCD(real_minutes);
CMOS_WRITE(real_seconds, RTC_SECONDS);
this_offset = hpet_readl(HPET_COUNTER);
} while (read_seqretry(&xtime_lock, seq));
offset = (this_offset - last_offset);
- offset *= (NSEC_PER_SEC/HZ) / hpet_tick;
+ offset *=(NSEC_PER_SEC/HZ)/hpet_tick;
+ return base + offset;
} else {
do {
seq = read_seqbegin(&xtime_lock);
base = monotonic_base;
} while (read_seqretry(&xtime_lock, seq));
this_offset = get_cycles_sync();
- offset = (this_offset - last_offset)*1000 / cpu_khz;
+ offset = (this_offset - last_offset)*1000/cpu_khz;
+ return base + offset;
}
- return base + offset;
}
EXPORT_SYMBOL(monotonic_clock);
static noinline void handle_lost_ticks(int lost, struct pt_regs *regs)
{
- static long lost_count;
- static int warned;
- if (report_lost_ticks) {
- printk(KERN_WARNING "time.c: Lost %d timer tick(s)! ", lost);
- print_symbol("rip %s)\n", regs->rip);
- }
-
- if (lost_count == 1000 && !warned) {
- printk(KERN_WARNING "warning: many lost ticks.\n"
- KERN_WARNING "Your time source seems to be instable or "
+ static long lost_count;
+ static int warned;
+
+ if (report_lost_ticks) {
+ printk(KERN_WARNING "time.c: Lost %d timer "
+ "tick(s)! ", lost);
+ print_symbol("rip %s)\n", regs->rip);
+ }
+
+ if (lost_count == 1000 && !warned) {
+ printk(KERN_WARNING
+ "warning: many lost ticks.\n"
+ KERN_WARNING "Your time source seems to be instable or "
"some driver is hogging interupts\n");
- print_symbol("rip %s\n", regs->rip);
- if (vxtime.mode == VXTIME_TSC && vxtime.hpet_address) {
- printk(KERN_WARNING "Falling back to HPET\n");
- if (hpet_use_timer)
- vxtime.last = hpet_readl(HPET_T0_CMP) -
- hpet_tick;
- else
- vxtime.last = hpet_readl(HPET_COUNTER);
- vxtime.mode = VXTIME_HPET;
- do_gettimeoffset = do_gettimeoffset_hpet;
- }
- /* else should fall back to PIT, but code missing. */
- warned = 1;
- } else
- lost_count++;
+ print_symbol("rip %s\n", regs->rip);
+ if (vxtime.mode == VXTIME_TSC && vxtime.hpet_address) {
+ printk(KERN_WARNING "Falling back to HPET\n");
+ if (hpet_use_timer)
+ vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick;
+ else
+ vxtime.last = hpet_readl(HPET_COUNTER);
+ vxtime.mode = VXTIME_HPET;
+ do_gettimeoffset = do_gettimeoffset_hpet;
+ }
+ /* else should fall back to PIT, but code missing. */
+ warned = 1;
+ } else
+ lost_count++;
#ifdef CONFIG_CPU_FREQ
- /* In some cases the CPU can change frequency without us noticing
- Give cpufreq a change to catch up. */
- if ((lost_count+1) % 25 == 0)
- cpufreq_delayed_get();
+ /* In some cases the CPU can change frequency without us noticing
+ (like going into thermal throttle)
+ Give cpufreq a change to catch up. */
+ if ((lost_count+1) % 25 == 0) {
+ cpufreq_delayed_get();
+ }
#endif
}
{
static unsigned long rtc_update = 0;
unsigned long tsc;
- int delay = 0, offset = 0, lost = 0;
+ int delay, offset = 0, lost = 0;
/*
* Here we are in the timer irq handler. We have irqs locally disabled (so we
*/
offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
delay = hpet_readl(HPET_COUNTER) - offset;
- } else if (!pmtmr_ioport) {
+ } else {
spin_lock(&i8253_lock);
outb_p(0x00, 0x43);
delay = inb_p(0x40);
return IRQ_HANDLED;
}
-static unsigned int cyc2ns_scale __read_mostly;
+static unsigned int cyc2ns_scale;
#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
static inline void set_cyc2ns_scale(unsigned long cpu_khz)
static unsigned long get_cmos_time(void)
{
- unsigned int year, mon, day, hour, min, sec;
+ unsigned int timeout = 1000000, year, mon, day, hour, min, sec;
+ unsigned char uip = 0, this = 0;
unsigned long flags;
- unsigned extyear = 0;
+
+/*
+ * The Linux interpretation of the CMOS clock register contents: When the
+ * Update-In-Progress (UIP) flag goes from 1 to 0, the RTC registers show the
+ * second which has precisely just started. Waiting for this can take up to 1
+ * second, we timeout approximately after 2.4 seconds on a machine with
+ * standard 8.3 MHz ISA bus.
+ */
spin_lock_irqsave(&rtc_lock, flags);
- do {
- sec = CMOS_READ(RTC_SECONDS);
- min = CMOS_READ(RTC_MINUTES);
- hour = CMOS_READ(RTC_HOURS);
- day = CMOS_READ(RTC_DAY_OF_MONTH);
- mon = CMOS_READ(RTC_MONTH);
- year = CMOS_READ(RTC_YEAR);
-#ifdef CONFIG_ACPI
- if (acpi_fadt.revision >= FADT2_REVISION_ID &&
- acpi_fadt.century)
- extyear = CMOS_READ(acpi_fadt.century);
-#endif
- } while (sec != CMOS_READ(RTC_SECONDS));
+ while (timeout && (!uip || this)) {
+ uip |= this;
+ this = CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP;
+ timeout--;
+ }
+
+ /*
+ * Here we are safe to assume the registers won't change for a whole
+ * second, so we just go ahead and read them.
+ */
+ sec = CMOS_READ(RTC_SECONDS);
+ min = CMOS_READ(RTC_MINUTES);
+ hour = CMOS_READ(RTC_HOURS);
+ day = CMOS_READ(RTC_DAY_OF_MONTH);
+ mon = CMOS_READ(RTC_MONTH);
+ year = CMOS_READ(RTC_YEAR);
spin_unlock_irqrestore(&rtc_lock, flags);
/*
* We know that x86-64 always uses BCD format, no need to check the
* config register.
- */
+ */
BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(mon);
BCD_TO_BIN(year);
- if (extyear) {
- BCD_TO_BIN(extyear);
- year += extyear;
- printk(KERN_INFO "Extended CMOS year: %d\n", extyear);
- } else {
- /*
- * x86-64 systems only exists since 2002.
- * This will work up to Dec 31, 2100
- */
- year += 2000;
- }
+ /*
+ * x86-64 systems only exists since 2002.
+ * This will work up to Dec 31, 2100
+ */
+ year += 2000;
return mktime(year, mon, day, hour, min, sec);
}
cpufreq_delayed_issched = 1;
if (!warned) {
warned = 1;
- printk(KERN_DEBUG
- "Losing some ticks... checking if CPU frequency changed.\n");
+ printk(KERN_DEBUG "Losing some ticks... checking if CPU frequency changed.\n");
}
schedule_work(&cpufreq_delayed_get_work);
}
lpj = &dummy;
if (!(freq->flags & CPUFREQ_CONST_LOOPS))
#ifdef CONFIG_SMP
- lpj = &cpu_data[freq->cpu].loops_per_jiffy;
+ lpj = &cpu_data[freq->cpu].loops_per_jiffy;
#else
- lpj = &boot_cpu_data.loops_per_jiffy;
+ lpj = &boot_cpu_data.loops_per_jiffy;
#endif
if (!ref_freq) {
unsigned int ntimer;
if (!vxtime.hpet_address)
- return 0;
+ return -1;
memset(&hd, 0, sizeof (hd));
int i;
hpet = (struct hpet *) fix_to_virt(FIX_HPET_BASE);
- timer = &hpet->hpet_timers[2];
- for (i = 2; i < ntimer; timer++, i++)
+
+ for (i = 2, timer = &hpet->hpet_timers[2]; i < ntimer;
+ timer++, i++)
hd.hd_irq[i] = (timer->hpet_config &
Tn_INT_ROUTE_CNF_MASK) >>
Tn_INT_ROUTE_CNF_SHIFT;
-xtime.tv_sec, -xtime.tv_nsec);
if (!hpet_init())
- vxtime_hz = (1000000000000000L + hpet_period / 2) / hpet_period;
+ vxtime_hz = (1000000000000000L + hpet_period / 2) /
+ hpet_period;
else
vxtime.hpet_address = 0;
if (hpet_use_timer) {
- /* set tick_nsec to use the proper rate for HPET */
- tick_nsec = TICK_NSEC_HPET;
cpu_khz = hpet_calibrate_tsc();
timename = "HPET";
#ifdef CONFIG_X86_PM_TIMER
static int __init nohpet_setup(char *s)
{
nohpet = 1;
- return 1;
+ return 0;
}
__setup("nohpet", nohpet_setup);
int __init notsc_setup(char *s)
{
notsc = 1;
- return 1;
+ return 0;
}
__setup("notsc", notsc_setup);
git://git.onelab.eu / linux-2.6.git / blobdiff