Data structures and functions required to manage the PIC8259. More...

Macros
#define	IRQ_NUM 16
	The total number of IRQs.

#define	IRQ_TIMER 0
	System timer.

#define	IRQ_KEYBOARD 1
	Keyboard controller.

#define	IRQ_TO_SLAVE_PIC 2
	cascaded signals from IRQs 8–15 (any devices configured to use IRQ 2 will actually be using IRQ 9)

#define	IRQ_COM2_4 3
	Serial port controller for serial port 2 (and 4).

#define	IRQ_COM1_3 4
	Serial port controller for serial port 1 (and 3).

#define	IRQ_LPT2 5
	Parallel port 2 and 3 (or sound card).

#define	IRQ_FLOPPY 6
	Floppy disk controller.

#define	IRQ_LPT1 7
	Parallel port 1.

#define	IRQ_REAL_TIME_CLOCK 8
	Real-time clock (RTC).

#define	IRQ_AVAILABLE_1 9
	Advanced Configuration and Power Interface (ACPI) system control interrupt on Intel chipsets.[1] Other chipset manufacturers might use another interrupt for this purpose, or make it available for the use of peripherals (any devices configured to use IRQ 2 will actually be using IRQ 9)

#define	IRQ_AVAILABLE_2 10
	The Interrupt is left open for the use of peripherals (open interrupt/available, SCSI or NIC).

#define	IRQ_AVAILABLE_3 11
	The Interrupt is left open for the use of peripherals (open interrupt/available, SCSI or NIC).

#define	IRQ_MOUSE 12
	Mouse on PS/2 connector.

#define	IRQ_MATH_CPU 13
	CPU co-processor or integrated floating point unit or inter-processor interrupt (use depends on OS).

#define	IRQ_FIRST_HD 14
	Primary ATA channel (ATA interface usually serves hard disk drives and CD drives).

#define	IRQ_SECOND_HD 15
	Secondary ATA channel.

Functions
void	pic8259_init_irq (void)
	Function that initializes the processor pic 8259 that will manage the interruptions.

int	pic8259_irq_enable (uint32_t irq)
	This function, enable irqs on the pic. More...

int	pic8259_irq_disable (uint32_t irq)
	This function, disable irqs on the pic. More...

void	pic8259_send_eoi (uint32_t irq)
	This is issued to the PIC chips at the end of an IRQ-based interrupt routine. More...

Detailed Description

Data structures and functions required to manage the PIC8259.

The Intel 8259 is a Programmable Interrupt Controller (PIC) designed for the Intel 8085 and Intel 8086 microprocessors.

Copyright: (c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

int pic8259_irq_disable ( uint32_t irq )

This function, disable irqs on the pic.

This function provide a tool for enabling irq from the pic processor.

Parameters

irq	Number of irq to enable.

int pic8259_irq_enable ( uint32_t irq )

This function, enable irqs on the pic.

This function provide a tool for enabling irq from the pic processor.

Parameters

irq	Number of irq to enable.

void pic8259_send_eoi ( uint32_t irq )

This is issued to the PIC chips at the end of an IRQ-based interrupt routine.

Parameters

irq	The interrupt number.