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interrupt.h File Reference

Interrupt manager header. More...

#include <const.h>

Go to the source code of this file.

Data Structures
struct	idt_entry
	IDT entry structure. More...
struct	idt_reg
	IDT register structure. More...
struct	irq_context
	Context after an interrupt. More...
Defines
#define	TIMER_IRQ   0x00
	Timer IRQ line.
#define	KEYBOARD_IRQ   0x01
	Keyboard IRQ line.
#define	RS232_1_IRQ   0x04
	Serial COM1 IRQ line.
#define	RS232_2_IRQ   0x03
	Serial COM2 IRQ line.
#define	FLOPPY_IRQ   0x06
	Floppy IRQ line.
#define	IDEP_IRQ   0x0E
	IDE primary channel IRQ line.
#define	IDES_IRQ   0x0F
	IDE secondary channel IRQ line.
#define	MINIRIGHI_INT   0x80
	Minirighi interrupt (used for the system calls).
#define	DOS_INT   0x20
	DOS interrupt (maybe will be used for DOS emulation...).
#define	EFLAGS_IF   0x200
	Interrupt enable flag in EFLAGS register.
#define	EFLAGS_IOPL3   0x3000
	I/O privilege level 3 (minimum privilege). Everyone can perform I/O operation.
#define	EFLAGS_IOPL2   0x2000
	I/O privilege level 2.
#define	EFLAGS_IOPL1   0x3000
	I/O privilege level 1.
#define	EFLAGS_IOPL0   0x0000
	I/O privilege level 0 (maximum privilege). Only the kernel can perform I/O operation.
#define	PORT_8259_M   0x20
	PIC 8259 master.
#define	PORT_8259_S   0xA0
	PIC 8259 slave.
#define	PORT_INT_MASK_M   0x21
	PIC 8259 master (interrupt mask).
#define	PORT_INT_MASK_S   0xA1
	PIC 8259 slave (interrupt mask).
#define	EOI   0x20
	PIC 8259 EOI (End Of Interrupt).
#define	IDT_DIM   256
	Number of entries in the IDT.
Typedefs
typedef idt_entry	idt_entry_t
	IDT entry structure.
typedef idt_reg	idt_reg_t
	IDT register structure.
typedef irq_context	irq_context_t
	Context after an interrupt.
Functions
void	disable_IRQ (uint8_t IRQ)
	Disable an IRQ line. Parameters: IRQ  The IRQ line to disable.
void	enable_IRQ (uint8_t IRQ)
	Enable an IRQ line. Parameters: IRQ  The IRQ line to enable.
void	reprogram_PIC ()
	Initialize the Programmable Interrupt Controllers (PICs). Note: The AT and PS/2 have 2 interrupt controllers to issue the IRQs, one master and one slaved at IRQ2. This routine initialize the 8259 interrupt controllers, using vector [0x20..0x2F] for [IRQ0..IRQ15] (0x20..0x27 for master and 0x28..0x2F for slave).
void	install_IDT ()
	Initialize the IDT (Interrupt Descriptor Table).
void	install_irq_handler (uint8_t irq, void *handler)
	Install an IRQ handler routine. Parameters: irq  The interrupt number. handler  A pointer to the handler routine. Note: This is valid only for hardware interrupts. You cannot install a software interrupt handler in this way.

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Detailed Description

Interrupt manager header.

Author:

Andrea Righi <drizzt@inwind.it>

Date:

Last update: 2003-11-05

Note:

Copyright (©) 2003 Andrea Righi

Definition in file interrupt.h.

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Define Documentation

#define DOS_INT   0x20

DOS interrupt (maybe will be used for DOS emulation...). Definition at line 37 of file interrupt.h.

#define EFLAGS_IF   0x200

Interrupt enable flag in EFLAGS register. Definition at line 42 of file interrupt.h.

#define EFLAGS_IOPL0   0x0000

I/O privilege level 0 (maximum privilege). Only the kernel can perform I/O operation. Definition at line 56 of file interrupt.h.

#define EFLAGS_IOPL1   0x3000

I/O privilege level 1. Definition at line 52 of file interrupt.h.

#define EFLAGS_IOPL2   0x2000

I/O privilege level 2. Definition at line 49 of file interrupt.h.

#define EFLAGS_IOPL3   0x3000

I/O privilege level 3 (minimum privilege). Everyone can perform I/O operation. Definition at line 46 of file interrupt.h.

#define EOI   0x20

PIC 8259 EOI (End Of Interrupt). Definition at line 69 of file interrupt.h.

#define FLOPPY_IRQ   0x06

Floppy IRQ line. Definition at line 24 of file interrupt.h.

#define IDEP_IRQ   0x0E

IDE primary channel IRQ line. Definition at line 27 of file interrupt.h.

#define IDES_IRQ   0x0F

IDE secondary channel IRQ line. Definition at line 29 of file interrupt.h.

#define IDT_DIM   256

Number of entries in the IDT. Definition at line 74 of file interrupt.h.

#define KEYBOARD_IRQ   0x01

Keyboard IRQ line. Definition at line 18 of file interrupt.h.

#define MINIRIGHI_INT   0x80

Minirighi interrupt (used for the system calls). Definition at line 35 of file interrupt.h.

#define PORT_8259_M   0x20

PIC 8259 master. Definition at line 61 of file interrupt.h.

#define PORT_8259_S   0xA0

PIC 8259 slave. Definition at line 63 of file interrupt.h.

#define PORT_INT_MASK_M   0x21

PIC 8259 master (interrupt mask). Definition at line 65 of file interrupt.h.

#define PORT_INT_MASK_S   0xA1

PIC 8259 slave (interrupt mask). Definition at line 67 of file interrupt.h.

#define RS232_1_IRQ   0x04

Serial COM1 IRQ line. Definition at line 20 of file interrupt.h.

#define RS232_2_IRQ   0x03

Serial COM2 IRQ line. Definition at line 22 of file interrupt.h.

#define TIMER_IRQ   0x00

Timer IRQ line. Definition at line 16 of file interrupt.h.

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Typedef Documentation

typedef struct idt_entry idt_entry_t

IDT entry structure.

typedef struct idt_reg idt_reg_t

IDT register structure.

typedef struct irq_context irq_context_t

Context after an interrupt.

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