#ifndef __LUNAIX_ACPI_ACPI_H
#define __LUNAIX_ACPI_ACPI_H

#include <arch/x86/boot/multiboot.h>
#include <stddef.h>
#include <stdint.h>

#include "fadt.h"
#include "madt.h"
#include "mcfg.h"
#include "sdt.h"

// * for quick conversion from a table name into ACPI favoured signature
// * use `echo <TableName> | xxd -eg4`

#define ACPI_RSDP_SIG_L 0x20445352 // 'RSD '
#define ACPI_RSDP_SIG_H 0x20525450 // 'PTR '

#define ACPI_MADT_SIG 0x43495041 // 'APIC'
#define ACPI_FADT_SIG 0x50434146 // 'FACP' Notice that it is not 'FADT'.

// 'MCFG' (Not part of ACPI standard. See PCI Firmware Spec.)
#define ACPI_MCFG_SIG 0x4746434d

typedef struct
{
    u32_t signature_l;
    u32_t signature_h;
    u8_t chksum;
    char oem_id[6];
    // Revision
    u8_t rev;
    acpi_rsdt_t* rsdt;
    u32_t length;
    acpi_sdthdr_t* xsdt;
    u8_t x_chksum;
    char reserved[3]; // Reserved field
} __attribute__((packed)) acpi_rsdp_t;

/**
 * @brief Main TOC of ACPI tables, provide hassle-free access of ACPI info.
 *
 */
typedef struct
{
    // Make it as null terminated
    char oem_id[7];
    acpi_madt_toc_t madt;
    acpi_fadt_t fadt;
    struct acpi_mcfg_toc mcfg;
} acpi_context;

int
acpi_init(multiboot_info_t* mb_info);

acpi_context*
acpi_get_context();

u8_t
acpi_gistranslate(u8_t old_irq);

#endif /* __LUNAIX_ACPI_ACPI_H */