text: /*
   * Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #pragma once
  
  #include <Kernel/Devices/BlockDevice.h>
  #include <Kernel/Devices/KCOVInstance.h>
  
  namespace Kernel {
  class KCOVDevice final : public BlockDevice {
      AK_MAKE_ETERNAL
      friend class DeviceManagement;
  
  public:
      static HashMap<ProcessID, KCOVInstance*>* proc_instance;
      static HashMap<ThreadID, KCOVInstance*>* thread_instance;
  
      static NonnullRefPtr<KCOVDevice> must_create();
      static void free_thread();
      static void free_process();
  
      // ^File
      ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
      ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
  
  protected:
      KCOVDevice();
  
      virtual StringView class_name() const override { return "KCOVDevice"sv; }
  
      virtual bool can_read(const OpenFileDescription&, size_t) const override final { return true; }
      virtual bool can_write(const OpenFileDescription&, size_t) const override final { return true; }
      virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
      virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
      virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
      virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
  };
  
  }
  