Kernel: Start adding support for E1000 network adapters.

Kernel/E1000NetworkAdapter.cpp

@@ -0,0 +1,172 @@
+#include <Kernel/E1000NetworkAdapter.h>
+#include <Kernel/PCI.h>
+#include <Kernel/IO.h>
+
+#define REG_CTRL        0x0000
+#define REG_STATUS      0x0008
+#define REG_EEPROM      0x0014
+#define REG_CTRL_EXT    0x0018
+#define REG_IMASK       0x00D0
+#define REG_RCTRL       0x0100
+#define REG_RXDESCLO    0x2800
+#define REG_RXDESCHI    0x2804
+#define REG_RXDESCLEN   0x2808
+#define REG_RXDESCHEAD  0x2810
+#define REG_RXDESCTAIL  0x2818
+#define REG_TCTRL       0x0400
+#define REG_TXDESCLO    0x3800
+#define REG_TXDESCHI    0x3804
+#define REG_TXDESCLEN   0x3808
+#define REG_TXDESCHEAD  0x3810
+#define REG_TXDESCTAIL  0x3818
+#define REG_RDTR        0x2820 // RX Delay Timer Register
+#define REG_RXDCTL      0x3828 // RX Descriptor Control
+#define REG_RADV        0x282C // RX Int. Absolute Delay Timer
+#define REG_RSRPD       0x2C00 // RX Small Packet Detect Interrupt
+#define REG_TIPG        0x0410 // Transmit Inter Packet Gap
+
+OwnPtr<E1000NetworkAdapter> E1000NetworkAdapter::autodetect()
+{
+    static const PCI::ID qemu_bochs_vbox_id = { 0x8086, 0x100e };
+    PCI::Address found_address;
+    PCI::enumerate_all([&] (const PCI::Address& address, PCI::ID id) {
+        if (id == qemu_bochs_vbox_id) {
+            found_address = address;
+            return;
+        }
+    });
+    if (found_address.is_null())
+        return nullptr;
+    byte irq = PCI::get_interrupt_line(found_address);
+    return make<E1000NetworkAdapter>(found_address, irq);
+}
+
+E1000NetworkAdapter::E1000NetworkAdapter(PCI::Address pci_address, byte irq)
+    : IRQHandler(irq)
+    , m_pci_address(pci_address)
+{
+    kprintf("E1000: Found at PCI address %b:%b:%b\n", pci_address.bus(), pci_address.slot(), pci_address.function());
+    m_mmio_base = PhysicalAddress(PCI::get_BAR0(m_pci_address));
+    MM.map_for_kernel(LinearAddress(m_mmio_base.get()), m_mmio_base);
+    m_use_mmio = true;
+    m_io_base = PCI::get_BAR1(m_pci_address) & ~1;
+    m_interrupt_line = PCI::get_interrupt_line(m_pci_address);
+    kprintf("E1000: IO port base: %w\n", m_io_base);
+    kprintf("E1000: MMIO base: P%x\n", m_mmio_base);
+    kprintf("E1000: Interrupt line: %u\n", m_interrupt_line);
+    detect_eeprom();
+    kprintf("E1000: Has EEPROM? %u\n", m_has_eeprom);
+    read_mac_address();
+    auto* mac = mac_address();
+    kprintf("E1000: MAC address: %b:%b:%b:%b:%b:%b\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+    enable_irq();
+}
+
+E1000NetworkAdapter::~E1000NetworkAdapter()
+{
+}
+
+void E1000NetworkAdapter::handle_irq()
+{
+    kprintf("E1000: IRQ!\n");
+}
+
+void E1000NetworkAdapter::detect_eeprom()
+{
+    out32(REG_EEPROM, 0x1);
+    for (volatile int i = 0; i < 999; ++i) {
+        dword data = in32(REG_EEPROM);
+        if (data & 0x10) {
+            m_has_eeprom = true;
+            return;
+        }
+    }
+    m_has_eeprom = false;
+}
+
+dword E1000NetworkAdapter::read_eeprom(byte address)
+{
+    word data = 0;
+    dword tmp = 0;
+    if (m_has_eeprom) {
+        out32(REG_EEPROM, ((dword)address << 8) | 1);
+        while (!((tmp = in32(REG_EEPROM)) & (1 << 4)))
+            ;
+    } else {
+        out32(REG_EEPROM, ((dword)address << 2) | 1);
+        while (!((tmp = in32(REG_EEPROM)) & (1 << 1)))
+            ;
+    }
+    data = (tmp >> 16) & 0xffff;
+    return data;
+}
+
+void E1000NetworkAdapter::read_mac_address()
+{
+    if (m_has_eeprom) {
+        byte mac[6];
+        dword tmp = read_eeprom(0);
+        mac[0] = tmp & 0xff;
+        mac[1] = tmp >> 8;
+        tmp = read_eeprom(1);
+        mac[2] = tmp & 0xff;
+        mac[3] = tmp >> 8;
+        tmp = read_eeprom(2);
+        mac[4] = tmp & 0xff;
+        mac[5] = tmp >> 8;
+        set_mac_address(mac);
+    } else {
+        ASSERT_NOT_REACHED();
+    }
+}
+
+void E1000NetworkAdapter::out8(word address, byte data)
+{
+    if (m_use_mmio) {
+        auto* ptr = (volatile byte*)(m_mmio_base.get() + address);
+        *ptr = data;
+        return;
+    }
+    IO::out8(m_io_base + address, data);
+}
+
+void E1000NetworkAdapter::out16(word address, word data)
+{
+    if (m_use_mmio) {
+        auto* ptr = (volatile word*)(m_mmio_base.get() + address);
+        *ptr = data;
+        return;
+    }
+    IO::out16(m_io_base + address, data);
+}
+
+void E1000NetworkAdapter::out32(word address, dword data)
+{
+    if (m_use_mmio) {
+        auto* ptr = (volatile dword*)(m_mmio_base.get() + address);
+        *ptr = data;
+        return;
+    }
+    IO::out32(m_io_base + address, data);
+}
+
+byte E1000NetworkAdapter::in8(word address)
+{
+    if (m_use_mmio)
+        return *(volatile byte*)(m_mmio_base.get() + address);
+    return IO::in8(m_io_base + address);
+}
+
+word E1000NetworkAdapter::in16(word address)
+{
+    if (m_use_mmio)
+        return *(volatile word*)(m_mmio_base.get() + address);
+    return IO::in16(m_io_base + address);
+}
+
+dword E1000NetworkAdapter::in32(word address)
+{
+    if (m_use_mmio)
+        return *(volatile dword*)(m_mmio_base.get() + address);
+    return IO::in32(m_io_base + address);
+}