forked from 0ad/0ad
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
|
/**
|
||
|
* =========================================================================
|
||
|
* File : hpet.h
|
||
|
* Project : 0 A.D.
|
||
|
* Description : Timer implementation using timeGetTime
|
||
|
* =========================================================================
|
||
|
*/
|
||
|
|
||
|
// license: GPL; see lib/license.txt
|
||
|
|
||
|
#ifndef INCLUDED_HPET
|
||
|
#define INCLUDED_HPET
|
||
|
|
||
|
#include "tick_source.h"
|
||
|
|
||
|
|
||
|
class TickSourceHpet : public TickSource
|
||
|
{
|
||
|
public:
|
||
|
TickSourceHpet();
|
||
|
virtual ~TickSourceHpet();
|
||
|
|
||
|
virtual const char* Name() const
|
||
|
{
|
||
|
return "HPET";
|
||
|
}
|
||
|
|
||
|
virtual bool IsSafe() const;
|
||
|
|
||
|
virtual u64 Ticks() const;
|
||
|
|
||
|
/**
|
||
|
* WHRT uses this to ensure the counter (running at nominal frequency)
|
||
|
* doesn't overflow more than once during CALIBRATION_INTERVAL_MS.
|
||
|
**/
|
||
|
virtual uint CounterBits() const;
|
||
|
|
||
|
/**
|
||
|
* initial measurement of the tick rate. not necessarily correct
|
||
|
* (e.g. when using TSC: cpu_ClockFrequency isn't exact).
|
||
|
**/
|
||
|
virtual double NominalFrequency() const;
|
||
|
|
||
|
private:
|
||
|
double m_frequency;
|
||
|
struct HpetRegisters;
|
||
|
volatile HpetRegisters* m_hpetRegisters;
|
||
|
uint m_counterBits;
|
||
|
};
|
||
|
|
||
|
#endif // #ifndef INCLUDED_HPET
|