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Linux Kernel
3.7.1
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Linux Kernel
3.7.1
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#include <linux/device.h>#include <linux/clocksource.h>#include <linux/init.h>#include <linux/module.h>#include <linux/sched.h>#include <linux/tick.h>#include <linux/kthread.h>Go to the source code of this file.
| int __clocksource_register_scale | ( | struct clocksource * | cs, |
| u32 | scale, | ||
| u32 | freq | ||
| ) |
__clocksource_register_scale - Used to install new clocksources : clocksource to be registered : Scale factor multiplied against freq to get clocksource hz : clocksource frequency (cycles per second) divided by scale
Returns -EBUSY if registration fails, zero otherwise.
This SHOULD NOT be called directly! Please use the clocksource_register_hz() or clocksource_register_khz helper functions.
Definition at line 711 of file clocksource.c.
| void __clocksource_updatefreq_scale | ( | struct clocksource * | cs, |
| u32 | scale, | ||
| u32 | freq | ||
| ) |
__clocksource_updatefreq_scale - Used update clocksource with new freq : clocksource to be registered : Scale factor multiplied against freq to get clocksource hz : clocksource frequency (cycles per second) divided by scale
This should only be called from the clocksource->enable() method.
This SHOULD NOT be called directly! Please use the clocksource_updatefreq_hz() or clocksource_updatefreq_khz helper functions.
Definition at line 659 of file clocksource.c.
| __setup | ( | ) |
clocks_calc_mult_shift - calculate mult/shift factors for scaled math of clocks : pointer to mult variable : pointer to shift variable : frequency to convert from : frequency to convert to : guaranteed runtime conversion range in seconds
The function evaluates the shift/mult pair for the scaled math operations of clocksources and clockevents.
and are frequency values in HZ. For clock sources is NSEC_PER_SEC == 1GHz and is the counter frequency. For clock event is the counter frequency and is NSEC_PER_SEC.
The conversion range argument controls the time frame in seconds which must be covered by the runtime conversion with the calculated mult and shift factors. This guarantees that no 64bit overflow happens when the input value of the conversion is multiplied with the calculated mult factor. Larger ranges may reduce the conversion accuracy by chosing smaller mult and shift factors.
Definition at line 134 of file clocksource.c.
| void clocksource_change_rating | ( | struct clocksource * | cs, |
| int | rating | ||
| ) |
clocksource_change_rating - Change the rating of a registered clocksource : clocksource to be changed : new rating
Definition at line 767 of file clocksource.c.
| int clocksource_register | ( | struct clocksource * | cs | ) |
clocksource_register - Used to install new clocksources : clocksource to be registered
Returns -EBUSY if registration fails, zero otherwise.
Definition at line 734 of file clocksource.c.
clocksource_resume - resume the clocksource(s)
Definition at line 471 of file clocksource.c.
clocksource_suspend - suspend the clocksource(s)
Definition at line 459 of file clocksource.c.
clocksource_touch_watchdog - Update watchdog
Update the watchdog after exception contexts such as kgdb so as not to incorrectly trip the watchdog. This might fail when the kernel was stopped in code which holds watchdog_lock.
Definition at line 489 of file clocksource.c.
| void clocksource_unregister | ( | struct clocksource * | cs | ) |
clocksource_unregister - remove a registered clocksource : clocksource to be unregistered
Definition at line 779 of file clocksource.c.
| EXPORT_SYMBOL | ( | clocksource_register | ) |
| EXPORT_SYMBOL | ( | clocksource_change_rating | ) |
| EXPORT_SYMBOL | ( | clocksource_unregister | ) |
| EXPORT_SYMBOL_GPL | ( | timecounter_init | ) |
| EXPORT_SYMBOL_GPL | ( | timecounter_read | ) |
| EXPORT_SYMBOL_GPL | ( | timecounter_cyc2time | ) |
| EXPORT_SYMBOL_GPL | ( | __clocksource_updatefreq_scale | ) |
| EXPORT_SYMBOL_GPL | ( | __clocksource_register_scale | ) |
| fs_initcall | ( | clocksource_done_booting | ) |
| u64 timecounter_cyc2time | ( | struct timecounter * | tc, |
| cycle_t | cycle_tstamp | ||
| ) |
timecounter_cyc2time - convert a cycle counter to same time base as values returned by timecounter_read() : Pointer to time counter. : a value returned by tc->cc->read()
Cycle counts that are converted correctly as long as they fall into the interval [-1/2 max cycle count, +1/2 max cycle count], with "max cycle count" == cs->mask+1.
This allows conversion of cycle counter values which were generated in the past.
Definition at line 88 of file clocksource.c.
| void timecounter_init | ( | struct timecounter * | tc, |
| const struct cyclecounter * | cc, | ||
| u64 | start_tstamp | ||
| ) |
timecounter_init - initialize a time counter : Pointer to time counter which is to be initialized/reset : A cycle counter, ready to be used. : Arbitrary initial time stamp.
After this call the current cycle register (roughly) corresponds to the initial time stamp. Every call to timecounter_read() increments the time stamp counter by the number of elapsed nanoseconds.
Definition at line 34 of file clocksource.c.
| u64 timecounter_read | ( | struct timecounter * | tc | ) |
timecounter_read - return nanoseconds elapsed since timecounter_init() plus the initial time stamp : Pointer to time counter.
In other words, keeps track of time since the same epoch as the function which generated the initial time stamp.
Definition at line 75 of file clocksource.c.
1.8.2