155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
#include <module.h>
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#include <logging.h>
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#include <pci.h>
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#include <ipv4.h>
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#include <mod/shell.h>
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static uint32_t rtl_device_pci = 0x00000000;
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static void find_rtl(uint32_t device, uint16_t vendorid, uint16_t deviceid) {
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if ((vendorid == 0x10ec) && (deviceid == 0x8139)) {
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rtl_device_pci = device;
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}
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}
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#define RTL_PORT_MAC 0x00
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#define RTL_PORT_MAR 0x08
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#define RTL_PORT_RBSTART 0x30
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#define RTL_PORT_CMD 0x37
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#define RTL_PORT_IMR 0x3C
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#define RTL_PORT_ISR 0x3E
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#define RTL_PORT_RCR 0x44
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#define RTL_PORT_CONFIG 0x52
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static uint8_t rtl_rx_buffer[8192+16];
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DEFINE_SHELL_FUNCTION(rtl, "rtl8139 experiments") {
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if (rtl_device_pci) {
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fs_printf(tty, "Located an RTL 8139: 0x%x\n", rtl_device_pci);
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uint16_t command_reg = pci_read_field(rtl_device_pci, PCI_COMMAND, 2);
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fs_printf(tty, "COMMAND register before: 0x%4x\n", command_reg);
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if (command_reg & 0x0002) {
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fs_printf(tty, "Bus mastering already enabled.\n");
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} else {
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command_reg |= 0x2; /* bit 2 */
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fs_printf(tty, "COMMAND register after: 0x%4x\n", command_reg);
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fs_printf(tty, "XXX: I can't write config registers :(\n");
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return -1;
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}
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uint32_t rtl_irq = pci_read_field(rtl_device_pci, PCI_INTERRUPT_LINE, 1);
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fs_printf(tty, "Interrupt Line: %x\n", rtl_irq);
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uint32_t rtl_bar0 = pci_read_field(rtl_device_pci, PCI_BAR0, 4);
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uint32_t rtl_bar1 = pci_read_field(rtl_device_pci, PCI_BAR1, 4);
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fs_printf(tty, "BAR0: 0x%8x\n", rtl_bar0);
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fs_printf(tty, "BAR1: 0x%8x\n", rtl_bar1);
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uint32_t rtl_iobase = 0x00000000;
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if (rtl_bar0 & 0x00000001) {
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rtl_iobase = rtl_bar0 & 0xFFFFFFFC;
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} else {
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fs_printf(tty, "This doesn't seem right! RTL8139 should be using an I/O BAR; this looks like a memory bar.");
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}
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fs_printf(tty, "RTL iobase: 0x%x\n", rtl_iobase);
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fs_printf(tty, "Determining mac address...\n");
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uint8_t mac[6];
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for (int i = 0; i < 6; ++i) {
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mac[i] = inports(rtl_iobase + RTL_PORT_MAC + i);
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}
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fs_printf(tty, "%2x:%2x:%2x:%2x:%2x:%2x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
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fs_printf(tty, "Enabling RTL8139.\n");
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outportb(rtl_iobase + RTL_PORT_CONFIG, 0x0);
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fs_printf(tty, "Resetting RTL8139.\n");
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outportb(rtl_iobase + RTL_PORT_CMD, 0x10);
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while ((inportb(rtl_iobase + 0x37) & 0x10) != 0) { }
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fs_printf(tty, "Done resetting RTL8139.\n");
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fs_printf(tty, "Initializing receive buffer.\n");
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outportl(rtl_iobase + RTL_PORT_RBSTART, (unsigned long)&rtl_rx_buffer);
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fs_printf(tty, "Enabling IRQs.\n");
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outports(rtl_iobase + RTL_PORT_IMR, 0x0005); /* TOK, ROK */
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fs_printf(tty, "Configuring receive buffer.\n");
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outportl(rtl_iobase + RTL_PORT_RCR, 0xF | (1 << 7)); /* 0xF = AB+AM+APM+AAP */
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fs_printf(tty, "Enabling receive and transmit.\n");
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outportb(rtl_iobase + RTL_PORT_CMD, 0x0C);
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#if 0
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fs_printf(tty, "Going to try to force-send a UDP packet...\n");
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struct ipv4_packet p;
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p.version_ihl = (4 << 4) & (5 << 0); /* IPv4, no options */
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p.dscp_ecn = 0; /* nope nope nope */
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p.length = sizeof(struct ipv4_packet) + sizeof(struct udp_packet) + sizeof(struct dhcp_packet);
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p.ident = 0;
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p.flags_fragment = 0;
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p.ttl = 0xFF;
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p.protocol = 17;
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p.checksum = 0; /* calculate this later */
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p.source = 0x00000000; /* 0.0.0.0 */
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p.destination = 0xFFFFFFFF; /* 255.255.255.255 */
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uint16_t * packet = (uint16_t *)&p;
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uint32_t total = 0;
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for (int i = 0; i < 10; ++i) {
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total += packet[i];
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if (total & 0x80000000) {
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total = (total & 0xFFFF) + (total >> 16);
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}
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}
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while (total >> 16) {
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total = (total & 0xFFFF) + (total >> 16);
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}
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p.checksum = ~total;
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struct udp_packet u;
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u.source = p.source;
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u.destination = p.destination;
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u.zeroes = 0;
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u.protocol = p.protocol;
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u.udp_length = p.length;
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u.source_port = 68;
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u.destination_port = 67;
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u.length = sizeof(struct dhcp_packet);
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u.checksum = 0;
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#endif
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} else {
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return -1;
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}
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return 0;
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}
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static int init(void) {
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BIND_SHELL_FUNCTION(rtl);
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pci_scan(&find_rtl, -1);
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if (!rtl_device_pci) {
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debug_print(ERROR, "No RTL 8139 found?");
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return 1;
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}
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return 0;
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}
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static int fini(void) {
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return 0;
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}
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MODULE_DEF(rtl8139, init, fini);
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MODULE_DEPENDS(debugshell);
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