pic8259 definitions. More...

Macros
#define	__DEBUG_HEADER__ "[PIC ]"
	Change header.

#define	__DEBUG_LEVEL__ LOGLEVEL_NOTICE
	Set log level.

#define	EOI 0x20
	End-of-interrupt command code.

#define	MASTER_PORT_COMMAND 0x20
	IO base address for master PIC.

#define	MASTER_PORT_DATA (MASTER_PORT_COMMAND + 1)
	I/O address for data to master.

#define	SLAVE_PORT_COMMAND 0xA0
	IO base address for slave PIC.

#define	SLAVE_PORT_DATA (SLAVE_PORT_COMMAND + 1)
	I/O address for data to slave.

#define	ICW1_ICW4 0x01
	ICW4 (not) needed.

#define	ICW1_SINGLE 0x02
	Single (cascade) mode.

#define	ICW1_INTERVAL4 0x04
	Call address interval 4 (8).

#define	ICW1_LEVEL 0x08
	Level triggered (edge) mode.

#define	ICW1_INIT 0x10
	Initialization - required.

#define	ICW4_8086 0x01
	8086/88 (MCS-80/85) mode

#define	ICW4_AUTO 0x02
	Auto (normal) EOI.

#define	ICW4_BUF_SLAVE 0x08
	Buffered mode/slave.

#define	ICW4_BUF_MASTER 0x0C
	Buffered mode/master.

#define	ICW4_SFNM 0x10
	Special fully nested (not).

#define	PIC_READ_IRR 0x0A
	OCW3 irq ready next CMD read.

#define	PIC_READ_ISR 0x0B
	OCW3 irq service next CMD read.

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...

Variables
static byte_t	master_cur_mask
	The current mask of the master.

static byte_t	slave_cur_mask
	The current mask of the slave.

Detailed Description

pic8259 definitions.

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.