pic.c File Reference

#include "pic.h"
#include <stdint.h>
#include "../../common/io.h"

Macros
#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	END_OF_INTERRUPT   0x20

Functions
void	pic_Remap (uint8_t offset1, uint8_t offset2)
	Remaps master PIC and slave PIC to specified interupts numbers.
void	pic_SetHz (uint16_t hz)
	Sets PIT Channel 0 frequency.
void	pic_EOI (unsigned char irq)
	Sends End Of Interrupt to PIC.

Macro Definition Documentation

END_OF_INTERRUPT

#define END_OF_INTERRUPT   0x20

ICW1_ICW4

#define ICW1_ICW4   0x01 /* ICW4 (not) needed */

ICW1_INIT

#define ICW1_INIT   0x10 /* Initialization - required! */

ICW1_INTERVAL4

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

ICW1_LEVEL

#define ICW1_LEVEL   0x08 /* Level triggered (edge) mode */

ICW1_SINGLE

#define ICW1_SINGLE   0x02 /* Single (cascade) mode */

ICW4_8086

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

ICW4_AUTO

#define ICW4_AUTO   0x02 /* Auto (normal) EOI */

ICW4_BUF_MASTER

#define ICW4_BUF_MASTER   0x0C /* Buffered mode/master */

ICW4_BUF_SLAVE

#define ICW4_BUF_SLAVE   0x08 /* Buffered mode/slave */

ICW4_SFNM

#define ICW4_SFNM   0x10 /* Special fully nested (not) */

Function Documentation

pic_EOI()

void pic_EOI

(

unsigned char

irq

)

Sends End Of Interrupt to PIC.

Parameters

irq	Number of IRQ to EOI

References END_OF_INTERRUPT, outb(), PIC1_COMMAND, and PIC2_COMMAND.

pic_Remap()

void pic_Remap	(	uint8_t	offset1,
		uint8_t	offset2
	)

Remaps master PIC and slave PIC to specified interupts numbers.

Parameters

offset1	New starting interrupt number for master PIC (IRQ 0-7)
offset2	New starting interrupt number for slave PIC (IRQ 8-15)

References ICW1_ICW4, ICW1_INIT, ICW4_8086, outb(), PIC1_COMMAND, PIC1_DATA, PIC2_COMMAND, and PIC2_DATA.

pic_SetHz()

void pic_SetHz

(

uint16_t

hz

)

Sets PIT Channel 0 frequency.

Parameters

hz	Desired PIT Hz

References outb().