#pragma once

#include <stdint.h>

struct RootSystemDescriptionPointer {
    char signature[8];
    uint8_t checksum;
    char oemid[6];
    uint8_t revision;
    uint32_t rsdt_address;
};

struct SystemDescriptionTableHeader {
    char signature[4];
    uint32_t length;
    uint8_t revision;
    uint8_t checksum;
    char oem_id[6];
    char oem_table_id[8];
    uint32_t oem_revision;
    uint32_t creator_id;
    uint32_t creator_revision;
};

struct RootSystemDescriptionTable {
    struct SystemDescriptionTableHeader header;
    uint32_t sdt_table[];
};

struct GenericAddressStructure {
    uint8_t address_space;
    uint8_t bit_width;
    uint8_t bit_offset;
    uint8_t access_size;
    uint64_t address;
};

struct FixedACPIDescriptionTable {
    struct SystemDescriptionTableHeader header;
    uint32_t firmware_ctrl;
    uint32_t dsdt;
 
    // field used in ACPI 1.0; no longer in use, for compatibility only
    uint8_t  reserved;
 
    uint8_t  preferred_power_management_profile;
    uint16_t sci_interrupt;
    uint32_t smi_command_port;
    uint8_t  acpi_enable;
    uint8_t  acpi_disable;
    uint8_t  s4bios_req;
    uint8_t  pstate_control;
    uint32_t pm1_a_event_block;
    uint32_t pm1_b_event_block;
    uint32_t pm1_a_control_block;
    uint32_t pm1_b_control_block;
    uint32_t pm2_control_block;
    uint32_t pm_timer_block;
    uint32_t gpe0_block;
    uint32_t gpe1_block;
    uint8_t  pm1_event_length;
    uint8_t  pm1_control_length;
    uint8_t  pm2_control_length;
    uint8_t  pm_timer_length;
    uint8_t  gpe0_length;
    uint8_t  gpe1_length;
    uint8_t  gpe1_base;
    uint8_t  cstate_control;
    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;
 
    // reserved in ACPI 1.0; used since ACPI 2.0+
    uint16_t boot_architecture_flags;
 
    uint8_t  reserved_2;
    uint32_t flags;
 
    // 12 byte structure; see below for details
    struct GenericAddressStructure reset_reg;
 
    uint8_t  reset_value;
    uint8_t  reserved_3[3];
 
    // 64bit pointers - Available on ACPI 2.0+
    uint64_t x_firmware_control;
    uint64_t x_dsdt;
 
    struct GenericAddressStructure x_pm1_a_event_block;
    struct GenericAddressStructure x_pm1_b_event_block;
    struct GenericAddressStructure x_pm1_a_control_block;
    struct GenericAddressStructure x_pm1_b_control_block;
    struct GenericAddressStructure x_pm2_control_block;
    struct GenericAddressStructure x_pm_timer_block;
    struct GenericAddressStructure x_gpe0_block;
    struct GenericAddressStructure x_gpe1_block;
};

extern void acpi_init(void);
extern void acpi_poweroff(void);