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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/include/kernel/timemgr.H $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2010 - 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
#ifndef __KERNEL_TIMEMGR_H
#define __KERNEL_TIMEMGR_H
#include <kernel/types.h>
#include <kernel/cpu.H>
#include <arch/ppc.H>
#include <util/locked/pqueue.H>
#include <kernel/spinlock.H>
class Scheduler;
/** Struct to hold sleeping tasks in a pqueue */
struct _TimeManager_Delay_t
{
_TimeManager_Delay_t * next;
_TimeManager_Delay_t * prev;
uint64_t key;
task_t* task;
};
/** @class TimeManager
* @brief Keeps track of sleeping of tasks and conversions between TB and time.
*/
class TimeManager
{
public:
enum
{
/** Number of time-slices to allow per second.
*
* Context length becomes (1/TIMESLICE_PER_SECOND) sec.
*/
TIMESLICE_PER_SEC = 1000,
};
/** Initialize the time subsystem. */
static void init();
/** Initialize the task-delay structures for a CPU. */
static void init_cpu(cpu_t* cpu);
/** Return the number of ticks per time-slice. */
static uint64_t getTimeSliceCount()
{
return iv_timebaseFreq / TIMESLICE_PER_SEC;
};
/** Returns the value of the processor timebase register. */
static uint64_t getCurrentTimeBase()
{
return getTB();
};
/** Converts seconds/nsecs to timebase ticks.
*
* Typically this is used for calculating the number of ticks in an
* interval.
*
* @param[in] i_sec - Number of seconds.
* @param[in] i_nsec - Number of nsecs.
*
* @return Number of timebase ticks.
*/
static uint64_t convertSecToTicks(uint64_t i_sec, uint64_t i_nsec);
/** Converts timebase ticks to seconds/nsecs.
*
* @param[in] i_ticks - Number of ticks.
* @param[out] o_sec - Number of seconds.
* @param[out] o_nsec - Number of nsecs.
*/
static void convertTicksToSec(uint64_t i_ticks,
uint64_t& o_sec, uint64_t& o_nsec);
/** Delay (sleep) a task for a length of time.
*
* @param[in] t - Task to delay.
* @param[in] i_sec - Seconds.
* @param[in] i_nsec - Nsecs.
*/
static void delayTask(task_t* t, uint64_t i_sec, uint64_t i_nsec);
/** Checks the sleep queue to determine if any tasks should be woken. */
static void checkReleaseTasks(Scheduler* s);
protected:
TimeManager() {};
~TimeManager() {};
private:
typedef Util::Locked::PQueue<_TimeManager_Delay_t, uint64_t>
delaylist_t;
void _init();
void _init_cpu(cpu_t* cpu);
void _delayTask(task_t* t, uint64_t i_sec, uint64_t i_nsec);
void _checkReleaseTasks(Scheduler* s);
inline delaylist_t* _get_delaylist();
/** Frequency of the timebase register in Hz. (ticks per second) */
static uint64_t iv_timebaseFreq;
};
#endif
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