Kernel: Implement rtl8139 network interface driver

Kernel/Net/RTL8139NetworkAdapter.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <AK/OwnPtr.h>
+#include <AK/RefPtr.h>
+#include <Kernel/IRQHandler.h>
+#include <Kernel/Net/NetworkAdapter.h>
+#include <Kernel/PCI.h>
+
+#define RTL8139_TX_BUFFER_COUNT 4
+
+class RTL8139NetworkAdapter final : public NetworkAdapter
+    , public IRQHandler {
+public:
+    static RTL8139NetworkAdapter* the();
+
+    static OwnPtr<RTL8139NetworkAdapter> autodetect();
+
+    RTL8139NetworkAdapter(PCI::Address, u8 irq);
+    virtual ~RTL8139NetworkAdapter() override;
+
+    virtual void send_raw(const u8*, int) override;
+    virtual bool link_up() const 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 };
+};