OSDev.org

Code: Select all

#define RX_BUF_LEN 8192 + 16 + 1500
#define RX_READ_POINTER_MASK (~3)
uint nic_base;
uint rx_buffer;
uint cpptr;

extern void set_idt_handler(int i, void (*handler));
extern void nic_irq();

void rtl8139_handler()
{
	int status = inw(nic_base + 0x3e);

	if(status & (1 << 0))
	{
		printf("\nrtl8139: debug: received packet");

		u16* pointer = (u16*)(rx_buffer + cpptr);  // packet pointer
		u16  pLen = *(t + 1);                                 // packet len

                // data pointer
		pointer = pointer + 2;
               
		void * packet_data = malloc(pLen);   
		memcpy(packet_data, pointer, pLen);
		mem_dump(packet_data, pLen, 15);

		printf("\n packet len %d", pLen);
		
		cpptr = (cpptr + packet_length + 4 + 3) & RX_READ_POINTER_MASK;

		if (cpptr > RX_BUF_LEN)
			cpptr -= RX_BUF_LEN;

		outw(nic_base + 0x38, cpptr - 0x10);
	}
	outw(nic_base + 0x3E, 0x5);
}

void rtl8139_init()
{
	uint8_t bus;
	uint8_t slot; 
	uint8_t func;

	PCIFindDevice2(&bus, &slot, &func, 0x8139, 0x10EC);
	
	if(bus      == 0xFF) return;
	if(slot      == 0xFF) return;
	if(func     == 0xFF) return;
	
	PciBar bar;
	PciGetBar(&bar, PCI_MAKE_ID(bus, slot, func), 0);

	uint32_t nic_addr = bar.u.port;

	printf("\nrtl8139: driver started");

	// Enable PCI Bus Mastering for NIC
	unsigned short cfg = PciRead16(PCI_MAKE_ID(bus, slot, func), 4);
	PciWrite16(PCI_MAKE_ID(bus, slot, func), 4, cfg | 2);

	// turn on
	outb(bar.u.port + 0x52, 0); 
	printf("\nrtl8139: turned on");

	// Send reset command to NIC
	printf("\nrtl8139: reseting card");
	outb(bar.u.port + 0x37, 0x10);

	// Wait.....
	while(inb(bar.u.port + 0x37) & 0x10){}

	// Allocate rx_buffer
	rx_buffer = malloc(RX_BUF_LEN);

	// set RX-buffer and interrupts
	outl(bar.u.port + 0x30, (uint)rx_buffer);

        // set IMR + ISR
	outw(bar.u.port + 0x3C, 0x0005);
        // Configuring receive buffer (RCR)
	outd(bar.u.port + 0x44, 0xf | (1 << 7));
        // Enable Receive and Transmitter
	outb(bar.u.port + 0x37, 0x0C);

		
	uint8_t irq = (uint8_t)PCIGetIRQ(bus, slot, func);
	__asm("cli");
	set_idt_handler(irq+32, &nic_irq);
	__asm("sti");

	nic_base = bar.u.port;
}