1 files changed, 95 insertions, 0 deletions
diff --git a/kernel/drivers/net.c b/kernel/drivers/net.c
new file mode 100644
index 0000000..dfc3cd5
--- /dev/null
+++ b/kernel/drivers/net.c
@@ -0,0 +1,95 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <cpu.h>
+#include <def.h>
+#include <interrupts.h>
+#include <mem.h>
+#include <net.h>
+#include <pci.h>
+#include <print.h>
+
+int rtl_irq = 0;
+u8 mac[6];
+u8 *rtl_rx_buffer;
+u32 rtl_device_pci = 0;
+u32 rtl_iobase = 0;
+
+void rtl8139_find(u32 device, u16 vendor_id, u16 device_id, void *extra)
+{
+	if ((vendor_id == 0x10ec) && (device_id == 0x8139)) {
+		*((u32 *)extra) = device;
+	}
+}
+
+void rtl8139_irq_handler()
+{
+	print("RTL INT!\n");
+	u16 status = inw((u16)(rtl_iobase + 0x3E));
+	if (!status)
+		return;
+	outw((u16)(rtl_iobase + 0x3E), status);
+
+	if (status & 0x01 || status & 0x02) {
+		print("RECEIVE\n");
+		/* while ((inw((u16)(rtl_iobase + 0x37)) & 0x01) == 0) { */
+		// RECEIVE
+		/* } */
+	}
+}
+
+void rtl8139_init()
+{
+	if (!rtl_device_pci)
+		return;
+
+	u16 command_reg = (u16)pci_read_field(rtl_device_pci, PCI_COMMAND, 4);
+	if ((command_reg & (1 << 2)) == 0) {
+		command_reg |= (1 << 2);
+		pci_write_field(rtl_device_pci, PCI_COMMAND, command_reg);
+	}
+
+	rtl_irq = pci_get_interrupt(rtl_device_pci);
+	irq_install_handler(rtl_irq, rtl8139_irq_handler);
+
+	u32 rtl_bar0 = pci_read_field(rtl_device_pci, PCI_BAR0, 4);
+	rtl_iobase = 0;
+
+	if (rtl_bar0 & 0x00000001)
+		rtl_iobase = rtl_bar0 & 0xFFFFFFFC;
+
+	// Get mac address
+	for (int i = 0; i < 6; ++i)
+		mac[i] = inb((u16)(rtl_iobase + 0x00 + i));
+	printf("Mac address: %x:%x:%x:%x:%x:%x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+
+	// Activate
+	outb((u16)(rtl_iobase + 0x52), 0x0);
+
+	// Reset
+	outb((u16)(rtl_iobase + 0x37), 0x10);
+	while ((inb((u16)(rtl_iobase + 0x37)) & 0x10) != 0)
+		;
+
+	// Set receive buffer
+	rtl_rx_buffer = (u8 *)malloc(8192 + 16);
+	outl((u16)(rtl_iobase + 0x30), (u32)rtl_rx_buffer);
+
+	// Enable ISR
+	outw((u16)(rtl_iobase + 0x3C), 0x0005);
+
+	// Accept packets
+	outl((u16)(rtl_iobase + 0x44), 0xf | (1 << 7));
+
+	// Enable receive and transmitter
+	outb((u16)(rtl_iobase + 0x37), 0x0C);
+}
+
+void net_install()
+{
+	pci_scan(&rtl8139_find, -1, &rtl_device_pci);
+
+	if (rtl_device_pci)
+		print("Found rtl8139 card\n");
+
+	rtl8139_init();
+}