//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:      ACPI, Hardware detection related                               //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2020 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K is free software: you can redistribute it and/or modify              //
//  it under the terms of the GNU General Public License as published by      //
//  the Free Software Foundation, either version 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K is distributed in the hope that it will be useful,                   //
//  but WITHOUT ANY WARRANTY//without even the implied warranty of            //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
//  GNU General Public License for more details.                              //
//                                                                            //
//  You should have received a copy of the GNU General Public License         //
//  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#ifndef _KERNEL_H
#include <kernel.h>
#endif

#ifndef _IO_ACPI_H
#define _IO_ACPI_H

//----------------------------------------------------------------------------//

//
// ACPI 1.0 descriptor
//
struct RSDPLegacy {
    char signature[8];
    uchar checksum;
    char OEMID[6];
    uchar revision;
    uint rsdtAddress;
} __attribute__ ((packed));

//
// ACPI 2.0 descriptor
//
struct RSDPDescriptor_t {
    // RSDT ACPI 1.0 and above
    struct RSDPLegacy legacy;

    // RSDT ACPI 2.0
    uint length;
    ulong xsdtAddress;
    uchar extendedChecksum;
    uchar reserved[3];
} __attribute__ ((packed));

//
// ACPI System Description Table
//
struct SDTHeader_t {
  char signature[4];
  uint length;
  uchar revision;
  uchar checksum;
  char OEMID[6];
  char OEMTableID[8];
  uint OEMRevision;
  uint creatorID;
  uint creatorRevision;
  uint sdtEntry;
};

//
// GAS type, used by ACPI tables to inform about registers
//
struct GenericAddressStructure
{
  uchar addressSpace;
  uchar width;
  uchar offset;
  uchar accessSize;
  ulong address;
};

//
// ACPI table types id
//
enum {
    SDT_MADT,
    SDT_BERT,
    SDT_CPEP,
    SDT_DSDT,
    SDT_ECDT,
    SDT_EINJ,
    SDT_ERST,
    SDT_FADT,
    SDT_FACS,
    SDT_HEST,
    SDT_MSCT,
    SDT_MPST,
    SDT_OEMx,
    SDT_PMTT,
    SDT_PSDT,
    SDT_RASF,
    SDT_RSDT,
    SDT_SBST,
    SDT_SLIT,
    SDT_SRAT,
    SDT_SSDT,
    SDT_XSDT,
    SDT_HEPT,
    SDT_MCFG
};

#define N_SDT_TYPES 24

//----------------------------------------------------------------------------//
// FADT related
//

struct FADT_t
{
    char signature[4];
    uint length;
    uchar revision;
    uchar checksum;
    char OEMID[6];
    char OEMTableID[8];
    uint OEMRevision;
    uint creatorID;
    uint creatorRevision;

    uint firmwareCtrlAddress;
    uint dsdtAddress;

    uchar  reserved; // legacy

    uchar  preferredPowerManagementProfile;
    ushort SCIInterrupt;
    uint SMICommandPort;
    uchar acpiEnable;
    uchar acpiDisable;
    uchar S4BIOSREQ;
    uchar PSTATEControl;
    uint PM1aEventBlock;
    uint PM1bEventBlock;
    uint PM1aControlBlock;
    uint PM1bControlBlock;
    uint PM2ControlBlock;
    uint PMTimerBlock;
    uint GPE0Block;
    uint GPE1Block;
    uchar PM1EventLength;
    uchar PM1ControlLength;
    uchar PM2ControlLength;
    uchar PMTimerLength;
    uchar GPE0Length;
    uchar GPE1Length;
    uchar GPE1Base;
    uchar CStateControl;
    ushort worstC2Latency;
    ushort worstC3Latency;
    ushort flushSize;
    ushort flushStride;
    uchar dutyOffset;
    uchar dutyWidth;
    uchar dayAlarm;
    uchar monthAlarm;
    uchar century;

    // reserved in ACPI1, available since ACPI2
    ushort bootArchitectureFlags;

    uchar reserved2; // legacy
    uint flags;

    struct GenericAddressStructure resetReg;
    uchar resetValue;

    uchar reserved3[3];

    // 64bit pointers, available since ACPI2
    ulong xFirmwareControlAddress;
    ulong xDsdtAddress;
    struct GenericAddressStructure xPM1aEventBlock;
    struct GenericAddressStructure xPM1bEventBlock;
    struct GenericAddressStructure xPM1aControlBlock;
    struct GenericAddressStructure xPM1bControlBlock;
    struct GenericAddressStructure xPM2ControlBlock;
    struct GenericAddressStructure xPMTimerBlock;
    struct GenericAddressStructure xGPE0Block;
    struct GenericAddressStructure xGPE1Block;
};

//----------------------------------------------------------------------------//

struct MCFG_t {
  char signature[4];
  uint length;
  uchar revision;
  uchar checksum;
  char OEMID[6];
  char OEMTableID[8];
  uint OEMRevision;
  uint creatorID;
  uint creatorRevision;
  ulong reserved;
  
  void* pciConfigBaseAddress;
} __attribute__ ((packed));

//----------------------------------------------------------------------------//

void IoInitAcpi(void);

SDTHeader_t *IoGetAcpiTable(ulong id);

//----------------------------------------------------------------------------//

#endif