Kernel: Add basic PCI and very basic rtl8139 support

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/rtl8139.c b/drivers/rtl8139.c
new file mode 100644
index 0000000..44212e0
--- /dev/null
+++ b/drivers/rtl8139.c
@@ -0,0 +1,50 @@
+#include <assert.h>
+#include <cpu/io.h>
+#include <drivers/pci.h>
+#include <drivers/rtl8139.h>
+#include <mmu.h>
+
+#define RBSTART 0x30
+#define CMD 0x37
+#define IMR 0x3C
+
+struct PCI_DEVICE rtl8139;
+uint8_t device_buffer[8192 + 16];
+
+void rtl8139_init(void) {
+  if (!pci_populate_device_struct(0x10EC, 0x8139, &rtl8139)) {
+    kprintf("RTL8139 not found :(\n");
+    return;
+  }
+  kprintf("RTL8139 found at bus: %x slot: %x\n", rtl8139.bus, rtl8139.slot);
+
+  uint8_t header_type = (pci_config_read32(&rtl8139, 0, 0xC) >> 16) & 0xFF;
+  assert(0 == header_type);
+
+  uint32_t base_address = pci_config_read32(&rtl8139, 0, 0x10);
+  uint8_t interrupt_line = pci_config_read32(&rtl8139, 0, 0x3C);
+  kprintf("interrupt_line: %x\n", interrupt_line);
+
+  // Turning on the device
+  outb(base_address + 0x52, 0x0);
+
+  // Reset the device and clear the RX and TX buffers
+  outb(base_address + CMD, 0x10);
+  for (; 0 != (inb(base_address + CMD) & 0x10);)
+    ;
+
+  // Setupt the recieve buffer
+  uint32_t rx_buffer = (uint32_t)virtual_to_physical(device_buffer, NULL);
+  outl(base_address + RBSTART, rx_buffer);
+
+  // Set IMR + ISR
+  outw(base_address + IMR, 0x0005); // Sets the TOK and ROK bits high
+
+  // Configure the recieve buffer
+  outl(base_address + 0x44,
+       0xf | (1 << 7)); // (1 << 7) is the WRAP bit, 0xf is AB+AM+APM+AAP
+
+  // Enable recieve and transmitter
+  outb(base_address + 0x37, 0x0C); // Sets the RE and TE bits high
+  asm("sti");
+}