io_apic.h

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#pragma once
 
#include <cpu_io.h>
 
#include <array>
#include <cstdint>
 
class IoApic {
 public:
  auto SetIrqRedirection(uint8_t irq, uint8_t vector,
                         uint32_t destination_apic_id, bool mask = false) const
      -> void;
 
  auto MaskIrq(uint8_t irq) const -> void;
 
  auto UnmaskIrq(uint8_t irq) const -> void;
 
  [[nodiscard]] auto GetId() const -> uint32_t;
 
  [[nodiscard]] auto GetVersion() const -> uint32_t;
 
  [[nodiscard]] auto GetMaxRedirectionEntries() const -> uint32_t;
 
  auto PrintInfo() const -> void;
 
  IoApic();
  IoApic(const IoApic&) = delete;
  IoApic(IoApic&&) = default;
  auto operator=(const IoApic&) -> IoApic& = delete;
  auto operator=(IoApic&&) -> IoApic& = default;
  ~IoApic() = default;
 
 private:
  static constexpr uint32_t kRegSel = 0x00;
  static constexpr uint32_t kRegWin = 0x10;
 
  static constexpr uint32_t kRegId = 0x00;
  static constexpr uint32_t kRegVer = 0x01;
  static constexpr uint32_t kRegArb = 0x02;
  static constexpr uint32_t kRedTblBase = 0x10;
 
  static constexpr uint64_t kVectorMask = 0xFF;
  static constexpr uint32_t kDeliveryModeShift = 8;
  static constexpr uint64_t kDestModeBit = 1ULL << 11;
  static constexpr uint64_t kDeliveryStatusBit = 1ULL << 12;
  static constexpr uint64_t kPolarityBit = 1ULL << 13;
  static constexpr uint64_t kRemoteIrrBit = 1ULL << 14;
  static constexpr uint64_t kTriggerModeBit = 1ULL << 15;
  static constexpr uint64_t kMaskBit = 1ULL << 16;
  static constexpr uint32_t kDestApicIdShift = 56;
  static constexpr uint64_t kDestApicIdMask = 0xFF;
 
  static constexpr uint32_t kDeliveryModeFixed = 0x0;
  static constexpr uint32_t kDeliveryModeLowestPriority = 0x1;
  static constexpr uint32_t kDeliveryModeSmi = 0x2;
  static constexpr uint32_t kDeliveryModeNmi = 0x4;
  static constexpr uint32_t kDeliveryModeInit = 0x5;
  static constexpr uint32_t kDeliveryModeExtInt = 0x7;
 
  static constexpr uint64_t kDefaultIoApicBase = 0xFEC00000;
 
  uint64_t base_address_{kDefaultIoApicBase};
 
  [[nodiscard]] auto Read(uint32_t reg) const -> uint32_t;
 
  auto Write(uint32_t reg, uint32_t value) const -> void;
 
  [[nodiscard]] auto ReadRedirectionEntry(uint8_t irq) const -> uint64_t;
 
  auto WriteRedirectionEntry(uint8_t irq, uint64_t value) const -> void;
};