idt.c File Reference

#include "idt.h"
#include <stdint.h>
#include "common/status.h"
#include "memory/memory.h"
#include "drivers/pic/pic.h"
#include "task/task.h"
#include "kernel.h"

Functions
void	idt_Load ()
	Loads Interrupt Descriptor Table.
void	idt_SetDescriptor (int int_no, void *address)
	Fills entry in IDT for specified Interrupt number Use before idt_Load()
int	idt_SetHandler (int int_no, ISR_HANDLER handler)
	Sets handler for given interrupt number.
void	idt_Init ()
	Initializes memory for IDT struct Sets default for all interrupts.
void	idt_Handler (int int_no, struct interrupt_frame *frame)
	Handles interrupt (called by ISR)

Variables
struct idt_desc	idt_descriptors [MAX_INTERRUPTS]
struct idtr_desc	idtr_descriptor
void *	interrupt_pointer_table [MAX_INTERRUPTS]
ISR_HANDLER	interrupt_handlers [MAX_INTERRUPTS]
const char *	idt_InterruptLayoutString [32]

Function Documentation

idt_Handler()

void idt_Handler	(	int	int_no,
		struct interrupt_frame *	frame
	)

Handles interrupt (called by ISR)

Parameters

int_no	Interrupt number
frame	Interrupt frame

References interrupt_handlers, kernel_page(), task_current_save_state(), and task_page().

idt_Init()

void idt_Init

(

)

Initializes memory for IDT struct Sets default for all interrupts.

References idtr_desc::base, idt_descriptors, idt_SetDescriptor(), idtr_descriptor, interrupt_pointer_table, idtr_desc::limit, MAX_INTERRUPTS, and memset().

idt_Load()

void idt_Load

(

)

Loads Interrupt Descriptor Table.

References idtr_descriptor.

idt_SetDescriptor()

void idt_SetDescriptor	(	int	int_no,
		void *	address
	)

Fills entry in IDT for specified Interrupt number Use before idt_Load()

Parameters

int_no	Interrupt number
address	Pointer to interrupt handler

References idt_descriptors, idt_desc::offset_high, idt_desc::offset_low, idt_desc::selector, idt_desc::type_attr, and idt_desc::zero.

idt_SetHandler()

int idt_SetHandler	(	int	int_no,
		ISR_HANDLER	handler
	)

Sets handler for given interrupt number.

Parameters

int_no	Interrupt number
handler	Handler function

Returns

int Error code

References ALL_OK, EINVARG, interrupt_handlers, and MAX_INTERRUPTS.

Variable Documentation

idt_descriptors

struct idt_desc idt_descriptors[MAX_INTERRUPTS]

idt_InterruptLayoutString

const char* idt_InterruptLayoutString[32]

idtr_descriptor

struct idtr_desc idtr_descriptor

interrupt_handlers

ISR_HANDLER interrupt_handlers[MAX_INTERRUPTS]

interrupt_pointer_table

void* interrupt_pointer_table[MAX_INTERRUPTS]

extern