IDT

Interrupt Descriptor Table. More...

Data Structures
struct	idt_desc_t
	IDT descriptor structure. More...
struct	idt_gate_t
	IDT gate structure. More...
struct	idt_t
	IDT structure. More...

Enumerations
enum	idt_attributes_t {   IDT_ATTR_INTERRUPT = 0b1110 ,   IDT_ATTR_TRAP = 0b1111 ,   IDT_ATTR_RING0 = 0b00 ,   IDT_ATTR_RING1 = 0b01 ,   IDT_ATTR_RING2 = 0b10 ,   IDT_ATTR_RING3 = 0b11 ,   IDT_ATTR_PRESENT = 1 << 7 }
	IDT gate attributes. More...

Functions
void	idt_init (void)
	Initialize the IDT structure in memory.
void	idt_cpu_load (void)
	Load the IDT on the current CPU.

Detailed Description

Interrupt Descriptor Table.

The Interrupt Descriptor Table tells a CPU what to do when it receives an interrupt or exception.

Enumeration Type Documentation

idt_attributes_t

enum idt_attributes_t

IDT gate attributes.

Enumerator
IDT_ATTR_INTERRUPT	Interrupt gate, will disable interrupts when invoked.
IDT_ATTR_TRAP	Trap gate, will NOT disable interrupts when invoked.
IDT_ATTR_RING0	Can be invoked from ring 0 or hardware only.
IDT_ATTR_RING1	Can be invoked from ring 1 or lower.
IDT_ATTR_RING2	Can be invoked from ring 2 or lower.
IDT_ATTR_RING3	Can be invoked from ring 3 or lower.
IDT_ATTR_PRESENT	Must be set for the entry to be valid.

Definition at line 22 of file idt.h.

Function Documentation

idt_cpu_load()

void idt_cpu_load

(

void

)

Load the IDT on the current CPU.

This will load the IDT using the lidt instruction.

Must be called after idt_init().

Definition at line 47 of file idt.c.

References idt_load_descriptor(), idt_desc_t::offset, and idt_desc_t::size.

Referenced by cpu_init().

idt_init()

void idt_init

(

void

)

Initialize the IDT structure in memory.

This will setup the IDT structure in memory, but will not load it. Loading is done in idt_cpu_load().

Definition at line 26 of file idt.c.

References EXCEPTION_AMOUNT, EXCEPTION_DOUBLE_FAULT, IDT_ATTR_INTERRUPT, IDT_ATTR_PRESENT, IDT_ATTR_RING0, idt_gate(), INTERRUPT_AMOUNT, TSS_IST_DOUBLE_FAULT, TSS_IST_EXCEPTION, TSS_IST_INTERRUPT, and vectorTable.

Referenced by init_early().