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#include <assert.h>
#include <cpu/idt.h>
#include <cpu/io.h>
#include <drivers/pci.h>
#include <drivers/rtl8139.h>
#include <mmu.h>
#include <network/arp.h>
#include <network/ethernet.h>
#define RBSTART 0x30
#define CMD 0x37
#define IMR 0x3C
#define TSD0 0x10 // transmit status
#define TSAD0 0x20 // transmit start address
struct PCI_DEVICE rtl8139;
uint8_t *device_buffer;
uint8_t *send_buffers[4];
struct _INT_PACKET_HEADER {
uint8_t ROK : 1;
uint8_t FAE : 1;
uint8_t CRC : 1;
uint8_t LONG : 1;
uint8_t RUNT : 1;
uint8_t ISE : 1;
uint8_t reserved : 5;
uint8_t BAR : 1;
uint8_t PAM : 1;
uint8_t MAR : 1;
};
struct PACKET_HEADER {
union {
uint16_t raw;
struct _INT_PACKET_HEADER data;
};
};
uint16_t current_packet_read = 0;
void handle_packet(void) {
assert(sizeof(struct _INT_PACKET_HEADER) == sizeof(uint16_t));
uint16_t *buf = (uint16_t *)(device_buffer + current_packet_read);
struct PACKET_HEADER packet_header;
packet_header.raw = *buf;
assert(packet_header.data.ROK);
kprintf("packet_header.raw: %x\n", packet_header.raw);
uint16_t packet_length = *(buf + 1);
kprintf("packet_length: %x\n", packet_length);
uint8_t packet_buffer[8192 + 16];
if (current_packet_read + packet_length >= 8192 + 16) {
uint32_t first_run = ((uint8_t *)buf + (8192 + 16)) - device_buffer;
memcpy(packet_buffer, buf, first_run);
memcpy(packet_buffer, device_buffer, packet_length - first_run);
} else {
memcpy(packet_buffer, buf, packet_length);
}
handle_ethernet((uint8_t *)packet_buffer + 4, packet_length);
// Thanks to exscape
// https://github.com/exscape/exscapeOS/blob/master/src/kernel/net/rtl8139.c
// and the programmers guide
// https://www.cs.usfca.edu/~cruse/cs326f04/RTL8139_ProgrammersGuide.pdf I
// have no clue what this calculation, I can't find anything possibly relating
// to this in the manual, but it does work I guess.
current_packet_read = (current_packet_read + packet_length + 4 + 3) & (~3);
current_packet_read %= 8192 + 16;
outw(rtl8139.gen.base_mem_io + 0x38, current_packet_read - 0x10);
}
__attribute__((interrupt)) void rtl8139_handler(void *regs) {
(void)regs;
uint16_t status = inw(rtl8139.gen.base_mem_io + 0x3e);
kprintf("status: %x\n", status);
outw(rtl8139.gen.base_mem_io + 0x3E, 0x5);
if (status & (1 << 2)) {
kprintf("Packet sent\n");
}
if (status & (1 << 0)) {
kprintf("Received packet\n");
handle_packet();
}
EOI(0xB);
}
int rtl8139_send_data(uint8_t *data, uint16_t data_size) {
const struct PCI_DEVICE *device = &rtl8139;
// FIXME: It should block or fail if there is too little space for the
// buffer
if (data_size > 0x1000)
return 0;
static int loop = 0;
if (loop > 3) {
loop = 0;
}
memcpy(send_buffers[loop], data, data_size);
outl(device->gen.base_mem_io + 0x20 + loop * 4,
(uint32_t)virtual_to_physical(send_buffers[loop], NULL));
outl(device->gen.base_mem_io + 0x10 + loop * 4, data_size);
loop += 1;
return 1;
}
void get_mac_address(uint8_t mac[6]) {
uint32_t base_address = rtl8139.gen.base_mem_io;
// Read the MAC address
uint64_t mac_address;
{
uint32_t low_mac = inl(base_address);
uint16_t high_mac = inw(base_address + 0x4);
mac_address = ((uint64_t)high_mac << 32) | low_mac;
}
kprintf("mac_address: %x\n", mac_address);
memcpy(mac, &mac_address, sizeof(uint8_t[6]));
}
uint8_t rtl8139_get_transmit_status(uint32_t base_address) {
uint32_t status_register = inl(base_address + 0x3E);
if ((status_register >> 3) & 0x1)
kprintf("transmit error :(\n");
uint8_t status = (status_register >> 2) & 0x1;
outl(base_address + 0x3E, 0x5);
return status;
}
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 = rtl8139.gen.base_mem_io;
uint8_t interrupt_line = pci_get_interrupt_line(&rtl8139);
// Enable bus mastering
uint32_t register1 = pci_config_read32(&rtl8139, 0, 0x4);
register1 |= (1 << 2);
pci_config_write32(&rtl8139, 0, 0x4, register1);
// 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);)
;
device_buffer = ksbrk(8192 + 16);
memset(device_buffer, 0, 8192 + 16);
// 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, (1 << 2) | (1 << 3) | (1 << 0));
// Set transmit and reciever enable
outb(base_address + 0x37, (1 << 2) | (1 << 3));
// Configure the recieve buffer
outl(base_address + 0x44,
0xf); // 0xf is AB+AM+APM+AAP
install_handler(rtl8139_handler, INT_32_INTERRUPT_GATE(0x0),
0x20 + interrupt_line);
// ksbrk() seems to have the magical ability of disabling interrupts?
// I have no fucking clue why that happens and it was a pain to debug.
for (int i = 0; i < 4; i++)
send_buffers[i] = ksbrk(0x1000);
}
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