From 79d2ca772615474f18f32e91cf7fa8d53d02e73d Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sun, 8 Dec 2019 18:45:28 +0100
Subject: Added very basic network and PCI driver

---
 src/kernel/net/network.h | 13 +++++++
 src/kernel/net/rtl8139.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 src/kernel/net/network.h
 create mode 100644 src/kernel/net/rtl8139.c

(limited to 'src/kernel/net')

diff --git a/src/kernel/net/network.h b/src/kernel/net/network.h
new file mode 100644
index 0000000..11a11e0
--- /dev/null
+++ b/src/kernel/net/network.h
@@ -0,0 +1,13 @@
+#ifndef MELVIX_NETWORK_H
+#define MELVIX_NETWORK_H
+
+void rtl8139_install();
+
+void network_install()
+{
+#ifdef rtl8139
+    rtl8139_install();
+#endif
+}
+
+#endif
diff --git a/src/kernel/net/rtl8139.c b/src/kernel/net/rtl8139.c
new file mode 100644
index 0000000..a233004
--- /dev/null
+++ b/src/kernel/net/rtl8139.c
@@ -0,0 +1,99 @@
+#include <kernel/io/io.h>
+#include <kernel/pci/pci.h>
+#include <kernel/system.h>
+#include <kernel/interrupts/interrupts.h>
+#include <kernel/lib/stdlib/liballoc.h>
+
+int rtl_irq = 0;
+uint8_t mac[6];
+uint8_t *rtl_rx_buffer;
+uint32_t rtl_iobase = 0;
+uint32_t rtl_device_pci = 0x00000000;
+
+void find_rtl(uint32_t device, uint16_t vendor_id, uint16_t device_id, void *extra)
+{
+    if ((vendor_id == 0x10ec) && (device_id == 0x8139)) {
+        *((uint32_t *) extra) = device;
+    }
+}
+
+void rtl8139_irq_handler(struct regs *r)
+{
+    serial_write("RTL INT!\n");
+    uint16_t status = inw(rtl_iobase + 0x3E);
+    if (!status) return;
+    outw(rtl_iobase + 0x3E, status);
+
+    if (status & 0x01 || status & 0x02) {
+        while ((inw(rtl_iobase + 0x37) & 0x01) == 0) {
+            serial_write("RECEIVE\n");
+            // RECEIVE
+        }
+    }
+}
+
+int rtl8139_init(void)
+{
+    if (rtl_device_pci) {
+        uint16_t command_reg = pci_read_field(rtl_device_pci, PCI_COMMAND, 4);
+
+        if (command_reg & (1 << 2)) {
+        } else {
+            command_reg |= (1 << 2);
+            pci_write_field(rtl_device_pci, PCI_COMMAND, 4, command_reg);
+        }
+
+        rtl_irq = pci_get_interrupt(rtl_device_pci);
+        irq_install_handler(rtl_irq, rtl8139_irq_handler);
+
+        uint32_t rtl_bar0 = pci_read_field(rtl_device_pci, PCI_BAR0, 4);
+        // uint32_t rtl_bar1 = pci_read_field(rtl_device_pci, PCI_BAR1, 4);
+
+        rtl_iobase = 0x00000000;
+
+        if (rtl_bar0 & 0x00000001)
+            rtl_iobase = rtl_bar0 & 0xFFFFFFFC;
+        else
+            warn("RTL8139 should be using an I/O BAR!");
+
+        // Get mac address
+        for (int i = 0; i < 6; ++i)
+            mac[i] = inb(rtl_iobase + 0x00 + i);
+        info("Mac address: %2x:%2x:%2x:%2x:%2x:%2x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+
+        // Activate (turn on)
+        outb(rtl_iobase + 0x52, 0x0);
+
+        // Reset
+        outb(rtl_iobase + 0x37, 0x10);
+        while ((inb(rtl_iobase + 0x37) & 0x10) != 0) {}
+
+        // Set receive buffer
+        rtl_rx_buffer = kmalloc(8192 + 16);
+        outl(rtl_iobase + 0x30, (uintptr_t) rtl_rx_buffer);
+
+        // Enable ISR
+        outw(rtl_iobase + 0x3C, 0x0005);
+
+        // Accept packets
+        outl(rtl_iobase + 0x44, 0xf | (1 << 7));
+
+        // Enable receive and transmitter
+        outb(rtl_iobase + 0x37, 0x0C);
+    } else {
+        return -1;
+    }
+    return 0;
+}
+
+void rtl8139_install()
+{
+    pci_scan(&find_rtl, -1, &rtl_device_pci);
+    if (!rtl_device_pci) {
+        warn("No rtl8139 network card found");
+        return;
+    }
+
+    if (rtl8139_init() == 0)
+        info("Installed rtl8139 network driver");
+}
\ No newline at end of file
-- 
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