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PIC Class Reference

The PIC is the programmable interrupt controller. More...

#include <pic.h>

List of all members.

Public Methods

void init ()

void signal_end_of_irq (unsigned char int_num)

void mask_irq (unsigned char int_num)

void unmask_irq (unsigned char int_num)

Static Public Methods

unsigned char int_to_irq (unsigned char irq_num)

Protected Methods

unsigned char read_register (PIC_io_base io_base, PIC_register register_num)

void write_register (PIC_io_base io_base, PIC_register register_num, unsigned char data)

Protected Attributes

unsigned char masks [2]

Detailed Description

The PIC is the programmable interrupt controller.

Much of this code is borrowed from Lee Salzman's POS.

Member Function Documentation

void PIC::init ( )

Remap irqs 0-7 to 0x20-0x27 and 8-15 to 0x28-0x2f, and then set default masks.

unsigned char PIC::int_to_irq ( unsigned char irq_num ) [inline, static]

Convert an interrupt number to its original pre-remapped irq number.

void PIC::mask_irq ( unsigned char int_num )

Disable an individual irq (int_num is the remapped int number).

unsigned char PIC::read_register ( PIC_io_base io_base,

PIC_register register_num

) [inline, protected]

Read a value from a register on the PIC.

void PIC::signal_end_of_irq ( unsigned char int_num ) [inline]

Irq handlers must signal to the PIC when the handler is complete. Only hardware interrupt handlers need to do this. Note that this int_num is the remapped interrupt number, not the original irq.

void PIC::unmask_irq ( unsigned char int_num )

Enable an individual irq (int_num is the remapped int number).

void PIC::write_register ( PIC_io_base io_base,

PIC_register register_num,

unsigned char data

) [inline, protected]

Write a value to a register on the PIC.

Member Data Documentation

unsigned char PIC::masks[2] [protected]

masks showing which irqs are enabled.

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

Public Methods
void	init ()
void	signal_end_of_irq (unsigned char int_num)
void	mask_irq (unsigned char int_num)
void	unmask_irq (unsigned char int_num)
Static Public Methods
unsigned char	int_to_irq (unsigned char irq_num)
Protected Methods
unsigned char	read_register (PIC_io_base io_base, PIC_register register_num)
void	write_register (PIC_io_base io_base, PIC_register register_num, unsigned char data)
Protected Attributes
unsigned char	masks [2]