Programmable Interrupt Controller (PIC) definitions and functions. More...

Collaboration diagram for PIC:

Detailed Description

Programmable Interrupt Controller (PIC) definitions and functions.

The PIC is a legacy interrupt controller used in x86 systems to manage hardware interrupts. It has largely been superseded by the APIC (Advanced Programmable Interrupt Controller) in modern systems, as such we simply disable the PIC during system initialization.

Macros
#define	PIC1 0x20

#define	PIC2 0xA0

#define	PIC1_COMMAND PIC1

#define	PIC1_DATA (PIC1 + 1)

#define	PIC2_COMMAND PIC2

#define	PIC2_DATA (PIC2 + 1)

#define	PIC_EOI 0x20

#define	ICW1_ICW4 0x01
	Indicates that ICW4 will be present.

#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)

Functions
void	pic_disable (void)

Macro Definition Documentation

◆ PIC1

#define PIC1 0x20

Definition at line 15 of file pic.h.

◆ PIC2

#define PIC2 0xA0

Definition at line 16 of file pic.h.

◆ PIC1_COMMAND

#define PIC1_COMMAND PIC1

Definition at line 17 of file pic.h.

◆ PIC1_DATA

#define PIC1_DATA (PIC1 + 1)

Definition at line 18 of file pic.h.

◆ PIC2_COMMAND

#define PIC2_COMMAND PIC2

Definition at line 19 of file pic.h.

◆ PIC2_DATA

#define PIC2_DATA (PIC2 + 1)

Definition at line 20 of file pic.h.

◆ PIC_EOI

#define PIC_EOI 0x20

Definition at line 22 of file pic.h.

◆ ICW1_ICW4

#define ICW1_ICW4 0x01

Indicates that ICW4 will be present.

Definition at line 24 of file pic.h.

◆ ICW1_SINGLE

#define ICW1_SINGLE 0x02

Single (cascade) mode.

Definition at line 25 of file pic.h.

◆ ICW1_INTERVAL4

#define ICW1_INTERVAL4 0x04

Call address interval 4 (8)

Definition at line 26 of file pic.h.

◆ ICW1_LEVEL

#define ICW1_LEVEL 0x08

Level triggered (edge) mode.

Definition at line 27 of file pic.h.

◆ ICW1_INIT

#define ICW1_INIT 0x10

Initialization - required!

Definition at line 28 of file pic.h.

◆ ICW4_8086

#define ICW4_8086 0x01

8086/88 (MCS-80/85) mode

Definition at line 30 of file pic.h.

◆ ICW4_AUTO

#define ICW4_AUTO 0x02

Auto (normal) EOI.

Definition at line 31 of file pic.h.

◆ ICW4_BUF_SLAVE

#define ICW4_BUF_SLAVE 0x08

Buffered mode/slave.

Definition at line 32 of file pic.h.

◆ ICW4_BUF_MASTER

#define ICW4_BUF_MASTER 0x0C

Buffered mode/master.

Definition at line 33 of file pic.h.

◆ ICW4_SFNM

#define ICW4_SFNM 0x10

Special fully nested (not)

Definition at line 34 of file pic.h.

Function Documentation

◆ pic_disable()

void pic_disable ( void )

Definition at line 13 of file pic.c.

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