IDT Namespace Reference

Data Structures
struct	Gate
union	Offset
struct	Segment

Enumerations
enum	GateType : uint8_t {   TASK_GATE = 0x5, INTERRUPT_GATE_16_BIT = 0x6, TRAP_GATE_16_BIT = 0x7, INTERRUPT_GATE_32_BIT = 0xE,   TRAP_GATE_32_BIT = 0xF }

Functions
void	setGate (int n, uint32_t handler)
void	init ()

Variables
struct Gate	idt [ARCH_IDT_MAX_ENTRIES]
struct Registers::IDTR	idtr

Enumeration Type Documentation

GateType

enum IDT::GateType : uint8_t

Enumerator
TASK_GATE
INTERRUPT_GATE_16_BIT
TRAP_GATE_16_BIT
INTERRUPT_GATE_32_BIT
TRAP_GATE_32_BIT

Definition at line 18 of file idt.hpp.

              : uint8_t
{
    TASK_GATE               = 0x5,
    INTERRUPT_GATE_16_BIT   = 0x6,
    TRAP_GATE_16_BIT        = 0x7,
    INTERRUPT_GATE_32_BIT   = 0xE,
    TRAP_GATE_32_BIT        = 0xF,
};

Function Documentation

init()

void IDT::init

(

)

Calls the lidt instruction and installs the IDT onto the CPU.

Definition at line 41 of file idt.cpp.

{
    // Update the IDT table
    idtr.size = sizeof(idt) - 1;
    idtr.base = (uint32_t)&idt;
    // Load the IDT table into the IDT register
    asm volatile(
        "lidt (%0)"
        :
        : "r"(&idtr)
        : "memory");
}

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setGate()

void IDT::setGate	(	int	n,
		uint32_t	handler
	)

Sets the handler function (via address) for a specific IDT.

Parameters

n	IDT index
handler	Handler address

Definition at line 21 of file idt.cpp.

{
    struct Gate* gate = &idt[n];
    union Offset offset = { .value = handler_addr };
    gate->offset_low = offset.section.low;
    gate->selector = {
        .privilege = 0,
        .table = 0,
        .index = 1,
    };
    gate->reserved = 0;
    gate->flags = {
        .type = INTERRUPT_GATE_32_BIT,
        .offset = 0,
        .privilege = 0,
        .present = 1,
    };
    gate->offset_high = offset.section.high;
}

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Variable Documentation

idt

struct Gate IDT::idt[ARCH_IDT_MAX_ENTRIES]

Definition at line 18 of file idt.cpp.

idtr

struct Registers::IDTR IDT::idtr

Definition at line 19 of file idt.cpp.