Detailed Description

Interrupt Descriptor Table.

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

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.

Macro Definition Documentation

#define IDT_GATE_AMOUNT (UINT8_MAX + 1)

Number of IDT gates.

Definition at line 20 of file idt.h.

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 26 of file idt.h.

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().

The IDT is setup according to the values in irq_virt_t.

Definition at line 27 of file idt.c.

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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 53 of file idt.c.

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