#ifndef CRASHPOWEROS_ACPI_H
#define CRASHPOWEROS_ACPI_H

#include <stdint.h>

typedef struct RSDPDescriptor RSDPDescriptor;
typedef struct GenericAddressStructure GenericAddressStructure;

struct RSDPDescriptor {
    char Signature[8];
    uint8_t Checksum;
    char OEMID[6];
    uint8_t Revision;
    uint32_t RsdtAddress;
} __attribute__ ((packed));

struct RSDPDescriptor20 {
    struct RSDPDescriptor firstPart;

    uint32_t Length;
    uint64_t XsdtAddress;
    uint8_t ExtendedChecksum;
    uint8_t reserved[3];
} __attribute__ ((packed));

struct ACPISDTHeader {
    char Signature[4];
    uint32_t Length;
    uint8_t Revision;
    uint8_t Checksum;
    char OEMID[6];
    char OEMTableID[8];
    uint32_t OEMRevision;
    uint32_t CreatorID;
    uint32_t CreatorRevision;
};

struct RSDT {
    struct ACPISDTHeader h;
    uint32_t PointerToOtherSDT;
};

struct XSDT {
    struct ACPISDTHeader h;
    uint64_t PointerToOtherSDT;
};

struct GenericAddressStructure {
    uint8_t AddressSpace;
    uint8_t BitWidth;
    uint8_t BitOffset;
    uint8_t AccessSize;
    uint64_t Address;
};

struct FADT {
    struct ACPISDTHeader h;
    uint32_t FirmwareCtrl;
    uint32_t Dsdt;

    uint8_t Reserved;

    uint8_t PreferredPowerManagementProfile;
    uint16_t SCI_Interrupt;
    uint32_t SMI_CommandPort;
    uint8_t AcpiEnable;
    uint8_t AcpiDisable;
    uint8_t S4BIOS_REQ;
    uint8_t PSTATE_Control;
    uint32_t PM1aEventBlock;
    uint32_t PM1bEventBlock;
    uint32_t PM1aControlBlock;
    uint32_t PM1bControlBlock;
    uint32_t PM2ControlBlock;
    uint32_t PMTimerBlock;
    uint32_t GPE0Block;
    uint32_t GPE1Block;
    uint8_t PM1EventLength;
    uint8_t PM1ControlLength;
    uint8_t PM2ControlLength;
    uint8_t PMTimerLength;
    uint8_t GPE0Length;
    uint8_t GPE1Length;
    uint8_t GPE1Base;
    uint8_t CStateControl;
    uint16_t WorstC2Latency;
    uint16_t WorstC3Latency;
    uint16_t FlushSize;
    uint16_t FlushStride;
    uint8_t DutyOffset;
    uint8_t DutyWidth;
    uint8_t DayAlarm;
    uint8_t MonthAlarm;
    uint8_t Century;

    uint16_t BootArchitectureFlags;

    uint8_t Reserved2;
    uint32_t Flags;

    GenericAddressStructure ResetReg;

    uint8_t ResetValue;
    uint8_t Reserved3[3];

    uint64_t X_FirmwareControl;
    uint64_t X_Dsdt;

    GenericAddressStructure X_PM1aEventBlock;
    GenericAddressStructure X_PM1bEventBlock;
    GenericAddressStructure X_PM1aControlBlock;
    GenericAddressStructure X_PM1bControlBlock;
    GenericAddressStructure X_PM2ControlBlock;
    GenericAddressStructure X_PMTimerBlock;
    GenericAddressStructure X_GPE0Block;
    GenericAddressStructure X_GPE1Block;
};

struct DSDT_vals {
    int length;
    void *S5_object;
};

void *findRSDP();
int acpi_check_hdr(uint8_t *table, const char *sig, int n);
void parse_dsdt();
void parse_acpi(void *mem);
void parse_acpi20(void *mem);
void acpi_enable();
void init_acpi();

#endif //CRASHPOWEROS_ACPI_H