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)

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

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

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

void	setMode (int mode_val)
	Set operational mode. More...

void	setBCD (int bcd_val)
	Set count encoding. More...

uint8_t	read ()
	Read a count byte. More...

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

bool	outputHigh ()
	Is the output high? More...

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

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

void	startup ()
	Start ticking. More...

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. More...

uint16_t	initial_count
	Initial count value. More...

uint16_t	latched_count
	Latched count. More...

uint16_t	period
	Interrupt period. More...

Tick	offset
	When to start ticking. More...

uint8_t	mode
	Current mode of operation. More...

bool	output_high
	Output goes high when the counter reaches zero. More...

bool	latch_on
	State of the count latch. More...

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

uint8_t	write_byte

Intel8254Timer *	parent
	Pointer to container. More...

Detailed Description

Counter element for PIT.

Definition at line 81 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 142 of file intel_8254_timer.hh.

Constructor & Destructor Documentation

◆ Counter()

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

Definition at line 100 of file intel_8254_timer.cc.

References offset, and period.

Member Function Documentation

◆ currentCount()

int Intel8254Timer::Counter::currentCount ( )

Get the current count for this counter.

Definition at line 122 of file intel_8254_timer.cc.

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

Referenced by latchCount(), and read().

◆ latchCount()

void Intel8254Timer::Counter::latchCount ( )

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

Definition at line 111 of file intel_8254_timer.cc.

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

◆ name()

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

inlineprivate

Definition at line 111 of file intel_8254_timer.hh.

References _name.

◆ outputHigh()

bool Intel8254Timer::Counter::outputHigh ( )

Is the output high?

Definition at line 226 of file intel_8254_timer.cc.

References output_high.

Referenced by Intel8254Timer::outputHigh().

◆ read()

uint8_t Intel8254Timer::Counter::read ( )

Read a count byte.

Definition at line 136 of file intel_8254_timer.cc.

References X86ISA::count, currentCount(), latch_on, latched_count, LSB, MSB, panic, and read_byte.

Referenced by Intel8254Timer::readCounter().

◆ serialize()

void 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 232 of file intel_8254_timer.cc.

References curTick(), event, initial_count, latch_on, latched_count, mode, output_high, paramOut(), period, read_byte, Event::scheduled(), Event::when(), and write_byte.

◆ setBCD()

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

Set count encoding.

Definition at line 219 of file intel_8254_timer.cc.

References panic.

◆ setMode()

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

Set operational mode.

Definition at line 209 of file intel_8254_timer.cc.

References Intel8254Timer::InitTc, mode, panic, Intel8254Timer::RateGen, and Intel8254Timer::SquareWave.

◆ setRW()

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

Set the read/write mode.

Definition at line 202 of file intel_8254_timer.cc.

References panic, and Intel8254Timer::TwoPhase.

◆ startup()

void Intel8254Timer::Counter::startup ( )

Start ticking.

Definition at line 268 of file intel_8254_timer.cc.

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

Referenced by Intel8254Timer::outputHigh().

◆ unserialize()

void 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 250 of file intel_8254_timer.cc.

References event, initial_count, latch_on, latched_count, mode, offset, output_high, paramIn(), period, read_byte, Event::scheduled(), and write_byte.

◆ write()

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

Write a count byte.

Definition at line 170 of file intel_8254_timer.cc.

References EventManager::deschedule(), event, initial_count, LSB, mode, MSB, offset, output_high, parent, period, Intel8254Timer::RateGen, running, Event::scheduled(), Intel8254Timer::SquareWave, and write_byte.

Referenced by Intel8254Timer::writeCounter().

Member Data Documentation

◆ _name

std::string Intel8254Timer::Counter::_name

private

Definition at line 110 of file intel_8254_timer.hh.

Referenced by name(), and Intel8254Timer::name().

◆ event

CounterEvent Intel8254Timer::Counter::event

private

Definition at line 115 of file intel_8254_timer.hh.

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

◆ initial_count

uint16_t Intel8254Timer::Counter::initial_count

private

Initial count value.

Definition at line 121 of file intel_8254_timer.hh.

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

◆ latch_on

bool Intel8254Timer::Counter::latch_on

private

State of the count latch.

Definition at line 139 of file intel_8254_timer.hh.

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

◆ latched_count

uint16_t Intel8254Timer::Counter::latched_count

private

Latched count.

Definition at line 124 of file intel_8254_timer.hh.

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

◆ mode

uint8_t Intel8254Timer::Counter::mode

private

Current mode of operation.

Definition at line 133 of file intel_8254_timer.hh.

Referenced by currentCount(), Intel8254Timer::Counter::CounterEvent::process(), serialize(), setMode(), unserialize(), and write().

◆ num

unsigned int Intel8254Timer::Counter::num

private

Definition at line 113 of file intel_8254_timer.hh.

Referenced by Intel8254Timer::outputHigh(), Intel8254Timer::Counter::CounterEvent::process(), Intel8254Timer::readCounter(), and Intel8254Timer::writeCounter().

◆ offset

Tick Intel8254Timer::Counter::offset

private

When to start ticking.

Definition at line 130 of file intel_8254_timer.hh.

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

◆ output_high

bool Intel8254Timer::Counter::output_high

private

Output goes high when the counter reaches zero.

Definition at line 136 of file intel_8254_timer.hh.

Referenced by outputHigh(), Intel8254Timer::Counter::CounterEvent::process(), serialize(), unserialize(), and write().

◆ parent

Intel8254Timer* Intel8254Timer::Counter::parent

private

Pointer to container.

Definition at line 148 of file intel_8254_timer.hh.

Referenced by Intel8254Timer::Counter::CounterEvent::process(), Intel8254Timer::Counter::CounterEvent::setTo(), startup(), and write().

◆ period

uint16_t Intel8254Timer::Counter::period

private

Interrupt period.

Definition at line 127 of file intel_8254_timer.hh.

Referenced by Counter(), Intel8254Timer::Counter::CounterEvent::process(), serialize(), startup(), unserialize(), and write().

◆ read_byte

uint8_t Intel8254Timer::Counter::read_byte

private

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

Definition at line 145 of file intel_8254_timer.hh.

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

◆ running

bool Intel8254Timer::Counter::running

private

True after startup is called.

Definition at line 118 of file intel_8254_timer.hh.

Referenced by startup(), and write().

◆ write_byte

uint8_t Intel8254Timer::Counter::write_byte

private

Definition at line 145 of file intel_8254_timer.hh.

Referenced by 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()

◆ 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