madt.h

#pragma once
 
// https://wiki.osdev.org/MADT
 
#define MADT_SIGNATURE "APIC"
#include <common.h>
 
typedef struct {
    char signature[4];
    uint32_t length;
    char revision;
    char checksum;
    char oem_id[6];
    char oem_table$id[8];
    uint32_t oem_revision;
    uint32_t creator_id;
    uint32_t creator_revision;
 
    uint32_t lapic_addr;
    uint32_t flags;
} MADT_t;
 
// After the Flags field, starting at offset 0x2C,
// the rest of the MADT table contains a sequence
// of variable length records which enumerate the
// interrupt devices on this machine.
 
typedef enum {
    PROCESSOR_LOCAL_APIC = 0,
    IO_APIC = 1,
    IO_APIC_INTERRUPT_SOURCE = 2,
    LAPIC_ADDRESS_OVERRIDE = 5
} MADTEntryType;
 
typedef struct {
    char type;
    char length;
} MADTEntry_t;
 
typedef struct {
    char processor_id;
    char apic_id;
    uint32_t flags;
} ProcessorLocalAPIC_t;
 
typedef struct {
    char ioapic_id;
    char reserved;
    uint32_t ioapic_address;
    uint32_t global_system_interrupt_base;
} IOAPIC_t;
 
typedef struct {
    char bus_source;
    char irq_source;
    uint32_t global_system_interrupt;
    uint16_t flags;
} IOAPICInterruptSource_t;