/* -------------------------------------------

    Copyright Mahrouss Logic

------------------------------------------- */

#include <Builtins/ACPI/ACPIFactoryInterface.hxx>
#include <HALKit/AMD64/Processor.hpp>
#include <NewKit/KernelCheck.hpp>

///////////////////////////////////////////////////////////////////////////////////////

//! NOTE: fGSI stands 'Field Global System Interrupt'

///////////////////////////////////////////////////////////////////////////////////////

namespace NewOS::HAL {
constexpr Int32 kThreadAPIC = 0;
constexpr Int32 kThreadLAPIC = 1;
constexpr Int32 kThreadIOAPIC = 2;
constexpr Int32 kThreadAPIC64 = 3;
constexpr Int32 kThreadBoot = 4;

/*
 *
 * this is used to store info about the current running thread
 * we use this struct to determine if we can use it, or mark it as used or on
 * sleep.
 *
 */

struct ProcessorInfoAMD64 final {
  Int32 ThreadType;
  UIntPtr JumpAddress;

  struct {
    UInt32 Code;
    UInt32 Data;
    UInt32 BSS;
  } Selector;
};

STATIC voidPtr kApicMadt = nullptr;
STATIC const char* kApicSignature = "APIC";

/// @brief Multiple APIC descriptor table.
struct MadtType final : public SDT {
  struct MadtAddress final {
    UInt32 fFlags;  // 1 = Dual Legacy PICs installed
    UInt32 fPhysicalAddress;

    Char fType;
    Char fRecLen;  // record length
  } Madt[];
};

struct MadtProcessorLocalApic final {
  Char fProcessorId;
  Char fApicId;
  UInt32 fFlags;
};

struct MadtIOApic final {
  Char fApicId;
  Char fReserved;
  UInt32 fAddress;
  UInt32 fSystemInterruptBase;
};

struct MadtInterruptSource final {
  Char fBusSource;
  Char fIrqSource;
  UInt32 fGSI;
  UInt16 fFlags;
};

struct MadtInterruptNmi final {
  Char fNmiSource;
  Char fReserved;
  UInt16 fFlags;
  UInt32 fGSI;
};

struct MadtLocalApicAddressOverride final {
  UInt16 fResvered;
  UIntPtr fAddress;
};

///////////////////////////////////////////////////////////////////////////////////////

STATIC MadtType* kApicInfoBlock = nullptr;

///////////////////////////////////////////////////////////////////////////////////////

void hal_system_get_cores(voidPtr rsdPtr) {
  kcout << "New OS: Constructing ACPIFactoryInterface...\r";

  auto acpi = ACPIFactoryInterface(rsdPtr);
  kApicMadt = acpi.Find(kApicSignature).Leak().Leak();

  if (kApicMadt) {
      kcout << "New OS: Successfuly fetched the MADT!\r";
      kApicInfoBlock = (MadtType*)kApicMadt;
  } else {
      MUST_PASS(false);
  }
}
}  // namespace NewOS::HAL

///////////////////////////////////////////////////////////////////////////////////////