#ifndef _ACPI_ACPI_H
#define _ACPI_ACPI_H

#include <libk/types.h>
#include <libk/compiler.h>

struct acpi_header {
  byte_t signature[4];
  uint32_t length;
  uint8_t revision;
  uint8_t checksum;
  byte_t oem[6];
  byte_t oemtable[8];
  uint32_t oem_revision;
  uint32_t creator;
  uint32_t creator_revision;
} packed;

struct acpi_rsdp {
  byte_t signature[8];
  uint8_t checksum;
  byte_t oem[6];
  uint8_t revision;
  uint32_t rsdt_addr;
} packed;

struct acpi_rsdt {
  struct acpi_header h;
  uint32_t ptrs[];
};

/* Address space */
enum {
  ACPI_GAS_SYSMEMORY    = 0,
  ACPI_GAS_SYSIO        = 1,
  ACPI_GAS_PCI_CONFIG   = 2,
  ACPI_GAS_MBED_CTL     = 3,
  ACPI_GAS_SYSMGMT_BUS  = 4,
  ACPI_GAS_CMOS         = 5,
  ACPI_GAS_PCI_BAR_TGT  = 6,
  ACPI_GAS_IPMI         = 7,
  ACPI_GAS_GPIO         = 8,
  ACPI_GAS_SERIAL_BUS   = 9,
  ACPI_GAS_PLAT_COM_CHL = 10,
};

/* Access size */
enum {
  ACPI_GAS_UNDEFINED  = 0,
  ACPI_GAS_BYTE       = 1,
  ACPI_GAS_WORD       = 2,
  ACPI_GAS_DWORD      = 3,
  ACPI_GAS_QWORD      = 4,
};

struct acpi_gas {
  uint8_t addr_space;
  uint8_t bit_width;
  uint8_t bit_offset;
  uint8_t access_size;
  uint64_t addr;
} packed;

struct acpi_fadt {
  struct acpi_header h;

  uint32_t firmware_ctl;
  uint32_t dsdt;

  uint8_t reserved;

  uint8_t preferred_power_mgmt_profile;
  uint16_t sci_interrupt;
  uint32_t smi_cmd_port;
  uint8_t acpi_enable;
  uint8_t acpi_disable;
  uint8_t s4bios_req;
  uint8_t pstate_ctl;
  uint32_t pm1a_evt_blk;
  uint32_t pm1b_evt_blk;
  uint32_t pm1a_ctl_blk;
  uint32_t pm1b_ctl_blk;
  uint32_t pm2_ctl_blk;
  uint32_t pm_timer_blk;
  uint32_t gpe0_blk;
  uint32_t gpe1_blk;
  uint8_t pm1_evt_length;
  uint8_t pm1_ctl_length;
  uint8_t pm2_ctl_length;
  uint8_t pm_timer_length;
  uint8_t gpe0_length;
  uint8_t gpe1_length;
  uint8_t gpe1_base;
  uint8_t cstate_ctl;
  uint16_t worst_c2_latency;
  uint16_t worst_c3_latency;
  uint16_t flush_size;
  uint16_t flush_stride;
  uint8_t duty_offset;
  uint8_t duty_width;
  uint8_t day_alarm;
  uint8_t month_alarm;
  uint8_t century;

  uint16_t boot_arch_flags;

  uint8_t reserved2;
  uint32_t flags;

  struct acpi_gas reset_reg;

  uint8_t reset_value;
  uint8_t reserved3[3];

  uint64_t x_firmware_ctl;
  uint64_t x_dsdt;

  struct acpi_gas x_pm1a_evt_blk;
  struct acpi_gas x_pm1b_evt_blk;
  struct acpi_gas x_pm1a_ctl_blk;
  struct acpi_gas x_pm1b_ctl_blk;
  struct acpi_gas x_pm2_ctl_blk;
  struct acpi_gas x_pm_timer_blk;
  struct acpi_gas x_gpe0_blk;
  struct acpi_gas x_gpe1_blk;
} packed;

struct acpi_madt {
  struct acpi_header h;

  uint32_t lapic_addr;
  uint32_t flags;
} packed;

enum {
  ACPI_LAPIC          = 0,
  ACPI_IOAPIC         = 1,
  ACPI_INTR_OVERRIDE  = 2,
};

struct acpi_apic_header {
  uint8_t type;
  uint8_t length;
} packed;

struct acpi_lapic {
  struct acpi_apic_header h;
  uint8_t acpi_cpu_id;
  uint8_t apic_id;
  uint32_t flags;
} packed;

struct acpi_ioapic {
  struct acpi_apic_header h;
  uint8_t ioapic_id;
  uint8_t reserved;
  uint32_t ioapic_addr;
  uint32_t global_intr_base;
};

struct acpi_intr_override {
  struct acpi_apic_header h;
  uint8_t bus;
  uint8_t source;
  uint32_t interrupt;
  uint16_t flags;
};

#define ACPI_MAP_START 0xC5000000

void acpi_init(void);

#endif // _ACPI_ACPI_H