text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <AK/OwnPtr.h>
  #include <Kernel/IRQHandler.h>
  #include <Kernel/Net/NetworkAdapter.h>
  #include <Kernel/PCI/Access.h>
  
  #define RTL8139_TX_BUFFER_COUNT 4
  
  class RTL8139NetworkAdapter final : public NetworkAdapter
      , public IRQHandler {
  public:
      static void detect(const PCI::Address&);
  
      RTL8139NetworkAdapter(PCI::Address, u8 irq);
      virtual ~RTL8139NetworkAdapter() override;
  
      virtual void send_raw(const u8*, size_t) override;
      virtual bool link_up() override { return m_link_up; }
  
  private:
      virtual void handle_irq() override;
      virtual const char* class_name() const override { return "RTL8139NetworkAdapter"; }
  
      void reset();
      void read_mac_address();
  
      void receive();
  
      void out8(u16 address, u8 data);
      void out16(u16 address, u16 data);
      void out32(u16 address, u32 data);
      u8 in8(u16 address);
      u16 in16(u16 address);
      u32 in32(u16 address);
  
      PCI::Address m_pci_address;
      u16 m_io_base { 0 };
      u8 m_interrupt_line { 0 };
      u32 m_rx_buffer_addr { 0 };
      u16 m_rx_buffer_offset { 0 };
      u32 m_tx_buffer_addr[RTL8139_TX_BUFFER_COUNT];
      u8 m_tx_next_buffer { 0 };
      u32 m_packet_buffer { 0 };
      bool m_link_up { false };
  };
  