#ifndef _ACPI_H
#define _ACPI_H

#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>

typedef struct {
	char sig[8];
	uint8_t checksum;
	char oem[6];
	uint8_t revision;
	uint32_t rsdt;
	uint32_t length;
	uint64_t xsdt;
	uint8_t xchecksum;
	uint8_t reserved[3];
} __attribute__((packed)) rsdp_t;

typedef struct {
	char sig[4];
	uint32_t length;
	uint8_t revision;
	uint8_t cechksum;
	char oemid[6];
	char oemtableid[8];
	uint32_t oemrevision;
	uint32_t creatorid;
	uint32_t creatorrevision;
} __attribute__((packed)) sdtheader_t;

typedef struct {
	sdtheader_t header;
	uint64_t tables[];
} __attribute__((packed)) xsdt_t;

typedef struct {
	sdtheader_t header;
	uint32_t tables[];
} __attribute__((packed)) rsdt_t;

typedef struct {
	sdtheader_t header;
	uint32_t addr;
	uint32_t flags;
} __attribute__((packed)) madt_t;

typedef struct {
	sdtheader_t header;
	uint8_t hwrev;
	uint8_t comparatorcount:5;
	uint8_t countersize:1;
	uint8_t reserved:1;
	uint8_t legacy_replacement:1;
	uint16_t pcivendor;
	uint8_t addrid;
	uint8_t bitwidth;
	uint8_t bitoffset;
	uint8_t reserved2;
	uint64_t addr;
	uint8_t hpetnum;
	uint16_t mintick;
	uint8_t pageprot;
} __attribute__((packed)) hpet_t;

typedef struct {
	uint64_t address;
	uint16_t sgn;
	uint8_t startbus;
	uint8_t endbus;
	uint32_t reserved;
} __attribute__((packed)) mcfgentry_t;

typedef struct {
	sdtheader_t header;
	uint64_t reserved;
	mcfgentry_t entries[];
} __attribute__((packed)) mcfg_t;

#define ACPI_MADT_TYPE_LAPIC 0
#define ACPI_MADT_TYPE_IOAPIC 1
#define ACPI_MADT_TYPE_OVERRIDE 2
#define ACPI_MADT_TYPE_IONMI 3
#define ACPI_MADT_TYPE_LANMI 4
#define ACPI_MADT_TYPE_64BITADDR 5
#define ACPI_MADT_TYPE_X2APIC 9

bool arch_acpi_checksumok(void *table);
void *arch_acpi_findtable(char *sig, int n);
void arch_acpi_init();

#endif