CounterHPET Class Reference

Inheritance diagram for CounterHPET:

Classes
struct	HpetDescriptionTable

Public Member Functions
	CounterHPET ()
virtual const wchar_t *	Name () const
Status	Activate ()
void	Shutdown ()
bool	IsSafe () const
u64	Counter () const
size_t	CounterBits () const
double	NominalFrequency () const
	initial measurement of the tick rate. More...
double	Resolution () const
	actual resolution [s]. More...
Public Member Functions inherited from ICounter
virtual	~ICounter ()

Private Types
enum	RegisterOffsets { CAPS_AND_ID = 0x00, CONFIG = 0x10, COUNTER_VALUE = 0xF0, MAX_OFFSET = 0x3FF }

Private Member Functions
u64	Read64 (size_t offset) const
void	Write64 (size_t offset, u64 value) const
Status	VerifyCapabilities (double &frequency, u32 &counterBits) const

Static Private Member Functions
static Status	MapRegisters (volatile void *&registers)

Private Attributes
volatile void *	m_hpetRegisters
double	m_frequency
u32	m_counterBits

Detailed Description

Definition at line 46 of file hpet.cpp.

Member Enumeration Documentation

enum CounterHPET::RegisterOffsets

private

Enumerator
CAPS_AND_ID
CONFIG
COUNTER_VALUE
MAX_OFFSET

Definition at line 128 of file hpet.cpp.

Constructor & Destructor Documentation

CounterHPET::CounterHPET ( )

inline

Definition at line 49 of file hpet.cpp.

Member Function Documentation

Status CounterHPET::Activate ( )

inlinevirtual

Implements ICounter.

Definition at line 59 of file hpet.cpp.

u64 CounterHPET::Counter ( ) const

inlinevirtual

Returns

the current value of the counter (all but the lower CounterBits() bits must be zero)

Implements ICounter.

Definition at line 89 of file hpet.cpp.

size_t CounterHPET::CounterBits ( ) const

inlinevirtual

Returns

the bit width of the counter (<= 64) WHRT uses this to ensure the counter (running at nominal frequency) doesn't overflow more than once during CALIBRATION_INTERVAL_MS.

Implements ICounter.

Definition at line 98 of file hpet.cpp.

bool CounterHPET::IsSafe ( ) const

inlinevirtual

Implements ICounter.

Definition at line 82 of file hpet.cpp.

static Status CounterHPET::MapRegisters ( volatile void *&  registers )

inlinestaticprivate

Definition at line 136 of file hpet.cpp.

virtual const wchar_t* CounterHPET::Name ( ) const

inlinevirtual

Implements ICounter.

Definition at line 54 of file hpet.cpp.

double CounterHPET::NominalFrequency ( ) const

inlinevirtual

initial measurement of the tick rate.

not necessarily correct (e.g. when using TSC: os_cpu_ClockFrequency isn't exact).

Implements ICounter.

Definition at line 103 of file hpet.cpp.

u64 CounterHPET::Read64 ( size_t  offset ) const

inlineprivate

Definition at line 161 of file hpet.cpp.

double CounterHPET::Resolution ( ) const

inlinevirtual

actual resolution [s].

differs from 1/NominalFrequency if the timer adjustment is greater than 1 tick.

Implements ICounter.

Definition at line 108 of file hpet.cpp.

void CounterHPET::Shutdown ( )

inlinevirtual

Implements ICounter.

Definition at line 73 of file hpet.cpp.

Status CounterHPET::VerifyCapabilities ( double &  frequency, u32 &  counterBits  ) const

inlineprivate

Definition at line 190 of file hpet.cpp.

void CounterHPET::Write64 ( size_t  offset, u64  value  ) const

inlineprivate

Definition at line 176 of file hpet.cpp.

Member Data Documentation

u32 CounterHPET::m_counterBits

private

Definition at line 226 of file hpet.cpp.

double CounterHPET::m_frequency

private

Definition at line 225 of file hpet.cpp.

volatile void* CounterHPET::m_hpetRegisters

private

Definition at line 224 of file hpet.cpp.

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The documentation for this class was generated from the following file:

• /home/sathyam/0ad.svn/source/lib/sysdep/os/win/whrt/hpet.cpp