Counter element for PIT. More...

#include <intel_8254_timer.hh>

Classes
class	CounterEvent
	Event for counter interrupt. More...

Public Member Functions
	Counter (Intel8254Timer *p, const std::string &name, unsigned int num)

unsigned int	index () const

void	latchCount ()
	Latch the current count (if one is not already latched)

int	currentCount ()
	Get the current count for this counter.

void	setRW (int rw_val)
	Set the read/write mode.

void	setMode (int mode_val)
	Set operational mode.

void	setBCD (int bcd_val)
	Set count encoding.

uint8_t	read ()
	Read a count byte.

void	write (const uint8_t data)
	Write a count byte.

bool	outputHigh ()
	Is the output high?

void	serialize (const std::string &base, CheckpointOut &cp) const
	Serialize this object to the given output stream.

void	unserialize (const std::string &base, CheckpointIn &cp)
	Reconstruct the state of this object from a checkpoint.

void	startup ()
	Start ticking.

Private Types
enum	{ LSB , MSB }
	Set of values for read_byte and write_byte. More...

Private Member Functions
const std::string &	name () const

Private Attributes
std::string	_name

unsigned int	num

CounterEvent	event

bool	running
	True after startup is called.

uint16_t	initial_count
	Initial count value.

uint16_t	latched_count
	Latched count.

uint16_t	period
	Interrupt period.

Tick	offset
	When to start ticking.

uint8_t	mode
	Current mode of operation.

bool	output_high
	Output goes high when the counter reaches zero.

bool	latch_on
	State of the count latch.

uint8_t	read_byte
	Determine which byte of a 16-bit count value to read/write.

uint8_t	write_byte

Intel8254Timer *	parent
	Pointer to container.

Detailed Description

Counter element for PIT.

Definition at line 94 of file intel_8254_timer.hh.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

private

Set of values for read_byte and write_byte.

Enumerator
LSB
MSB

Definition at line 155 of file intel_8254_timer.hh.

Constructor & Destructor Documentation

◆ Counter()

gem5::Intel8254Timer::Counter::Counter	(	Intel8254Timer *	p,
		const std::string &	name,
		unsigned int	num )

Definition at line 102 of file intel_8254_timer.cc.

References _name, event, initial_count, gem5::Intel8254Timer::Intel8254Timer(), latch_on, latched_count, LSB, mode, name(), num, offset, output_high, gem5::MipsISA::p, parent, period, read_byte, running, and write_byte.

Member Function Documentation

◆ currentCount()

int gem5::Intel8254Timer::Counter::currentCount ( )

Get the current count for this counter.

Definition at line 124 of file intel_8254_timer.cc.

References mode, gem5::Intel8254Timer::RateGen, gem5::Intel8254Timer::SquareWave, and warn_once.

Referenced by latchCount(), and read().

◆ index()

unsigned int gem5::Intel8254Timer::Counter::index ( ) const

inline

Definition at line 166 of file intel_8254_timer.hh.

References num.

◆ latchCount()

void gem5::Intel8254Timer::Counter::latchCount ( )

Latch the current count (if one is not already latched)

Definition at line 113 of file intel_8254_timer.cc.

References currentCount(), latch_on, latched_count, LSB, and read_byte.

◆ name()

const std::string & gem5::Intel8254Timer::Counter::name ( ) const

inlineprivate

Definition at line 124 of file intel_8254_timer.hh.

References _name.

Referenced by Counter().

◆ outputHigh()

bool gem5::Intel8254Timer::Counter::outputHigh ( )

Is the output high?

Definition at line 230 of file intel_8254_timer.cc.

References output_high.

◆ read()

uint8_t gem5::Intel8254Timer::Counter::read ( )

Read a count byte.

Definition at line 138 of file intel_8254_timer.cc.

References gem5::Intel8254Timer::count, currentCount(), latch_on, latched_count, LSB, MSB, panic, and read_byte.

◆ serialize()

void gem5::Intel8254Timer::Counter::serialize	(	const std::string &	base,
		CheckpointOut &	cp ) const

Serialize this object to the given output stream.

Parameters

base	The base name of the counter object.
os	The stream to serialize to.

Definition at line 236 of file intel_8254_timer.cc.

References gem5::RiscvISA::base, gem5::curTick(), event, initial_count, latch_on, latched_count, mode, output_high, gem5::paramOut(), period, read_byte, and write_byte.

◆ setBCD()

void gem5::Intel8254Timer::Counter::setBCD ( int bcd_val )

Set count encoding.

Definition at line 223 of file intel_8254_timer.cc.

References panic.

◆ setMode()

void gem5::Intel8254Timer::Counter::setMode ( int mode_val )

Set operational mode.

Definition at line 211 of file intel_8254_timer.cc.

References gem5::Intel8254Timer::InitTc, mode, panic, gem5::Intel8254Timer::RateGen, gem5::Intel8254Timer::SoftwareStrobe, gem5::Intel8254Timer::SquareWave, and warn_once.

◆ setRW()

void gem5::Intel8254Timer::Counter::setRW ( int rw_val )

Set the read/write mode.

Definition at line 204 of file intel_8254_timer.cc.

References panic, and gem5::Intel8254Timer::TwoPhase.

◆ startup()

void gem5::Intel8254Timer::Counter::startup ( )

Start ticking.

Definition at line 273 of file intel_8254_timer.cc.

References gem5::curTick(), event, offset, parent, period, and running.

◆ unserialize()

void gem5::Intel8254Timer::Counter::unserialize	(	const std::string &	base,
		CheckpointIn &	cp )

Reconstruct the state of this object from a checkpoint.

Parameters

base	The base name of the counter object.
cp	The checkpoint use.
section	The section name of this object

Definition at line 255 of file intel_8254_timer.cc.

References gem5::RiscvISA::base, event, initial_count, latch_on, latched_count, mode, offset, output_high, gem5::paramIn(), period, read_byte, and write_byte.

◆ write()

void gem5::Intel8254Timer::Counter::write ( const uint8_t data )

Write a count byte.

Definition at line 172 of file intel_8254_timer.cc.

References data, event, initial_count, LSB, mode, MSB, offset, output_high, parent, period, gem5::Intel8254Timer::RateGen, running, gem5::Intel8254Timer::SquareWave, and write_byte.

Member Data Documentation

◆ _name

std::string gem5::Intel8254Timer::Counter::_name

private

Definition at line 123 of file intel_8254_timer.hh.

Referenced by Counter(), and name().

◆ event

CounterEvent gem5::Intel8254Timer::Counter::event

private

Definition at line 128 of file intel_8254_timer.hh.

Referenced by Counter(), serialize(), startup(), unserialize(), and write().

◆ initial_count

uint16_t gem5::Intel8254Timer::Counter::initial_count

private

Initial count value.

Definition at line 134 of file intel_8254_timer.hh.

Referenced by Counter(), serialize(), unserialize(), and write().

◆ latch_on

bool gem5::Intel8254Timer::Counter::latch_on

private

State of the count latch.

Definition at line 152 of file intel_8254_timer.hh.

Referenced by Counter(), latchCount(), read(), serialize(), and unserialize().

◆ latched_count

uint16_t gem5::Intel8254Timer::Counter::latched_count

private

Latched count.

Definition at line 137 of file intel_8254_timer.hh.

Referenced by Counter(), latchCount(), read(), serialize(), and unserialize().

◆ mode

uint8_t gem5::Intel8254Timer::Counter::mode

private

Current mode of operation.

Definition at line 146 of file intel_8254_timer.hh.

Referenced by Counter(), currentCount(), serialize(), setMode(), unserialize(), and write().

◆ num

unsigned int gem5::Intel8254Timer::Counter::num

private

Definition at line 126 of file intel_8254_timer.hh.

Referenced by Counter(), and index().

◆ offset

Tick gem5::Intel8254Timer::Counter::offset

private

When to start ticking.

Definition at line 143 of file intel_8254_timer.hh.

Referenced by Counter(), startup(), unserialize(), and write().

◆ output_high

bool gem5::Intel8254Timer::Counter::output_high

private

Output goes high when the counter reaches zero.

Definition at line 149 of file intel_8254_timer.hh.

Referenced by Counter(), outputHigh(), serialize(), unserialize(), and write().

◆ parent

Intel8254Timer* gem5::Intel8254Timer::Counter::parent

private

Pointer to container.

Definition at line 161 of file intel_8254_timer.hh.

Referenced by Counter(), startup(), and write().

◆ period

uint16_t gem5::Intel8254Timer::Counter::period

private

Interrupt period.

Definition at line 140 of file intel_8254_timer.hh.

Referenced by Counter(), serialize(), startup(), unserialize(), and write().

◆ read_byte

uint8_t gem5::Intel8254Timer::Counter::read_byte

private

Determine which byte of a 16-bit count value to read/write.

Definition at line 158 of file intel_8254_timer.hh.

Referenced by Counter(), latchCount(), read(), serialize(), and unserialize().

◆ running

bool gem5::Intel8254Timer::Counter::running

private

True after startup is called.

Definition at line 131 of file intel_8254_timer.hh.

Referenced by Counter(), startup(), and write().

◆ write_byte

uint8_t gem5::Intel8254Timer::Counter::write_byte

private

Definition at line 158 of file intel_8254_timer.hh.

Referenced by Counter(), serialize(), unserialize(), and write().

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

dev/intel_8254_timer.hh
dev/intel_8254_timer.cc

Classes

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ Counter()

Member Function Documentation

◆ currentCount()

◆ index()

◆ latchCount()

◆ name()

◆ outputHigh()

◆ read()

◆ serialize()

◆ setBCD()

◆ setMode()

◆ setRW()

◆ startup()

◆ unserialize()

◆ write()

Member Data Documentation

◆ _name

◆ event

◆ initial_count

◆ latch_on

◆ latched_count

◆ mode

◆ num

◆ offset

◆ output_high

◆ parent

◆ period

◆ read_byte

◆ running

◆ write_byte