idt.h File Reference

#include <stdint.h>

Include dependency graph for idt.h:

Data Structures
struct	idt_gate_t
struct	idt_register_t

Macros
#define	IDT_ENTRIES   256

Functions
void	idt_load ()
void	idt_register_gate (uint16_t n, uint64_t handler, uint8_t type, uint8_t dpl)
void	idt_register_interrupt (uint16_t n, uint64_t handler)

Detailed Description

See also

https://wiki.osdev.org/Interrupt_Descriptor_Table

https://os.phil-opp.com/handling-exceptions/

Macro Definition Documentation

IDT_ENTRIES

#define IDT_ENTRIES   256

The number of entries in the Interrupt Descriptor Table.

There are 256 interrupts (0..255), so IDT should have 256 entries, each entry corresponding to a specific interrupt.

Function Documentation

idt_load()

void idt_load

(

)

Loads the Interrupt Descriptor Table. The table should be updated with idt_register_gate() and/or idt_register_interrupt() before calling this function.

idt_register_gate()

void idt_register_gate	(	uint16_t	n,
		uint64_t	handler,
		uint8_t	type,
		uint8_t	dpl )

Registers a gate in the IDT.

Parameters

n	a gate number
handler	the handler to register for the given gate
type	the gate type
dpl	the DPL value ("ring")

idt_register_interrupt()

void idt_register_interrupt	(	uint16_t	n,
		uint64_t	handler )

Registers a an interrupt gate in the IDT.

Parameters

n	a gate number
handler	the handler to register for the given gate