--- /dev/null
+#include <geekos/ne2k.h>
+#include <geekos/debug.h>
+#include <geekos/io.h>
+#include <geekos/irq.h>
+#include <geekos/malloc.h>
+
+static uint_t received = 0;
+
+struct _CR { //COMMAND REG
+ uint_t stp: 1; //STOP- software reset
+ uint_t sta: 1; //START- activates NIC
+ uint_t txp: 1; //TRANSMIT- set to send
+ uint_t rd: 3; //REMOTE DMA
+ uint_t ps: 2; //PAGE SELECT
+};
+
+struct _ISR{ //INTERRUPT STATUS REG
+ uint_t prx: 1; //PACKET RECIEVED
+ uint_t ptx: 1; //PACKET TRANSMITTED
+ uint_t rxe: 1; //TRANSMIT ERROR
+ uint_t txe: 1; //RECEIVE ERROR
+ uint_t ovw: 1; //OVERWRITE WARNING
+ uint_t cnt: 1; //COUNTER OVERFLOW
+ uint_t rdc: 1; //REMOTE DMA COMPLETE
+ uint_t rst: 1; //RESET STATUS
+};
+
+struct _IMR { //INTERRUPT MASK REG
+ uint_t prxe: 1; //PACKET RX INTRPT
+ uint_t ptxe: 1; //PACKET TX INTRPT
+ uint_t rxee: 1; //RX ERROR INTRPT
+ uint_t txee: 1; //TX ERROR INTRPt
+ uint_t ovwe: 1; //OVERWRITE WARNING INTRPT
+ uint_t cnte: 1; //COUNTER OVERFLOW INTRPT
+ uint_t rdce: 1; //DMA COMLETE INTRPT
+ uint_t rsvd: 1;
+};
+
+struct _DCR { //DATA CONFIG REGISTER
+ uint_t wts: 1; //WORD TRANSFER SELECT
+ uint_t bos: 1; //BYTE ORDER SELECT
+ uint_t las: 1; //LONG ADDR SELECT
+ uint_t ls: 1; //LOOPBACK SELECT
+ uint_t arm: 1; //AUTO-INITIALIZE REMOTE
+ uint_t ft: 2; //FIFO THRESH SELECT
+};
+
+struct _TCR { //TX CONFIG REGISTER
+ uint_t crc: 1; //INHIBIT CRC
+ uint_t lb: 2; //ENCODED LOOPBACK
+ uint_t atd: 1; //AUTO TRANSMIT
+ uint_t ofst: 1; //COLLISION OFFSET ENABLE
+ uint_t rsvd: 3;
+};
+
+struct _TSR {
+ uint_t ptx: 1; //PACKET TX
+ uint_t rsvd: 1;
+ uint_t col: 1; //TX COLLIDED
+ uint_t abt: 1; //TX ABORTED
+ uint_t crs: 1; //CARRIER SENSE LOST
+ uint_t fu: 1; //FIFO UNDERRUN
+ uint_t cdh: 1; //CD HEARTBEAT
+ uint_t owc: 1; //OUT OF WINDOW COLLISION
+};
+
+struct _RCR { //RECEIVE CONFIGURATION REGISTER
+ uint_t sep: 1; //SAVE ERRORED PACKETS
+ uint_t ar: 1; //ACCEPT RUNT PACKETS
+ uint_t ab: 1; //ACCEPT BROADCAST
+ uint_t am: 1; //ACCEPT MULTICAST
+ uint_t pro: 1; //PROMISCUOUS PHYSICAL
+ uint_t mon: 1; //MONITOR MODE
+ uint_t rsvd: 2;
+};
+
+struct _RSR { //RECEIVE STATUS REG
+ uint_t prx: 1; //PACKET RX INTACT
+ uint_t crc: 1; //CRC ERROR
+ uint_t fae: 1; //FRAME ALIGNMENT ERROR
+ uint_t fo: 1; //FIFO OVERRUN
+ uint_t mpa: 1; //MISSED PACKET
+ uint_t phy: 1; //PHYSICAL/MULTICAST ADDR
+ uint_t dis: 1; //RX DISABLED
+ uint_t dfr: 1; //DEFERRING
+};
+
+
+static void Dump_Registers()
+{
+ uint_t data;
+
+ PrintBoth("Dumping NIC registers for page %x...\n", (In_Byte(NE2K_CR) & 0xc0) >> 6);
+ uint_t i = 0;
+ for(i = 0; i <= 0x0f; i += 0x01) {
+ data = In_Byte(NE2K_BASE_ADDR+i);
+ PrintBoth("\t%x: %x\n", NE2K_BASE_ADDR + i, data);
+ }
+}
+
+static void NE2K_Interrupt_Handler(struct Interrupt_State * state)
+{
+ Begin_IRQ(state);
+ PrintBoth("NIC Interrupt Occured!\n");
+ uint_t isr_content = In_Byte(NE2K_ISR);
+ PrintBoth("Contents of ISR: %x\n", isr_content);
+ if(In_Byte(NE2K_ISR) & 0x01)
+ NE2K_Receive();
+
+ Out_Byte(NE2K_ISR, 0xff);
+ End_IRQ(state);
+}
+
+
+int Init_Ne2k()
+{
+
+uint_t CR_START_VAL = 0x21;
+static const uint_t DCR_START_VAL = 0x49;
+static const uint_t ISR_START_VAL = 0xff;
+static const uint_t RCR_START_VAL = 0x20;
+static const uint_t TCR_START_VAL = 0x02;
+//static const uint_t IMR_START_VAL = 0x00;
+PrintBoth("location Startval first = %x\n", &CR_START_VAL);
+
+ PrintBoth("Initializing network card...\n");
+
+ struct NE2K_REGS* regs = Malloc(sizeof(struct NE2K_REGS));
+
+ regs->cr = (struct _CR*)&CR_START_VAL;
+ regs->dcr = (struct _DCR*)&DCR_START_VAL;
+ regs->isr = (struct _ISR*)&ISR_START_VAL;
+ regs->rcr = (struct _RCR*)&RCR_START_VAL;
+ regs->tcr = (struct _TCR*)&TCR_START_VAL;
+
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+ Out_Byte(NE2K_DCR, *(uint_t *)regs->dcr);
+ Out_Byte(NE2K_ISR, *(uint_t *)regs->isr);
+ Out_Byte(NE2K_RCR, *(uint_t *)regs->rcr);
+ Out_Byte(NE2K_TCR, *(uint_t *)regs->tcr);
+ Out_Byte(NE2K_IMR, *(uint_t *)regs->imr);
+ Out_Byte(NE2K_RBCR0, 0x00);
+ Out_Byte(NE2K_RBCR1, 0x00);
+ Out_Byte(NE2K_RSAR0, 0x00);
+ Out_Byte(NE2K_RSAR1, 0x00);
+
+ Out_Byte(NE2K_TPSR, 0x40); // Set TPSR
+ Out_Byte(NE2K_PSTART, 0x42); // Set PSTART
+ Out_Byte(NE2K_BNRY, 0x59); // Set BNRY
+ Out_Byte(NE2K_PSTOP, 0x60); // Set PSTOP
+
+ Out_Byte(NE2K_ISR, *(uint_t *)regs->isr);
+
+ regs->imr->prxe = 0x1;
+ regs->imr->ptxe = 0x1;
+ regs->imr->rxee = 0x1;
+ regs->imr->txee = 0x1;
+ regs->imr->ovwe = 0x1;
+ regs->imr->cnte = 0x1;
+ Out_Byte(NE2K_IMR, *(uint_t *)regs->imr);
+
+ regs->cr->ps = 0x01; //switch to reg page 1
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+
+PrintBoth("Startval 2= %x\n", CR_START_VAL);
+
+PrintBoth("regs locat = %x\n", (uint_t *)regs->cr);
+PrintBoth("regs = %x\n", *(uint_t *)regs->cr);
+
+ /* Set the physical address of the card to 52:54:00:12:34:58 */
+ Out_Byte(NE2K_CR+0x01, 0x52);
+ Out_Byte(NE2K_CR+0x02, 0x54);
+ Out_Byte(NE2K_CR+0x03, 0x00);
+ Out_Byte(NE2K_CR+0x04, 0x12);
+ Out_Byte(NE2K_CR+0x05, 0x34);
+ Out_Byte(NE2K_CR+0x06, 0x58);
+
+ uint_t i;
+ for(i = 0x08; i <= 0x0f; i++) {
+ Out_Byte(NE2K_CR+i, 0xff);
+ }
+
+ *(uint_t *)regs->cr = 0x21; //set CR to start value
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+
+PrintBoth("startval 3 = %x\n", CR_START_VAL);
+PrintBoth("location Startval 2 = %x\n", &CR_START_VAL);
+PrintBoth("regs = %x\n", (uint_t *)regs->cr);
+
+ regs->tcr = 0x00;
+ Out_Byte(NE2K_TCR, *(uint_t *)regs->tcr);
+
+ regs->rcr->sep = 0x1;
+ regs->rcr->ar = 0x1;
+ regs->rcr->ab = 0x1;
+ regs->rcr->am = 0x1;
+ regs->rcr->pro = 0x1; //promiscuous mode, accept all packets
+ regs->rcr->mon = 0x0;
+ Out_Byte(NE2K_RCR, *(uint_t *)regs->rcr);
+
+ regs->cr->sta = 0x1; //toggle start bit
+ regs->cr->stp = 0x0;
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+
+ Dump_Registers();
+
+ Out_Byte(NE2K_CR, (*(uint_t *)regs->cr & 0x3f) | NE2K_PAGE1);
+ Dump_Registers();
+
+ Out_Byte(NE2K_CR, (*(uint_t *)regs->cr & 0x3f) | NE2K_PAGE2);
+ Dump_Registers();
+
+ // Reset?
+ Out_Byte(NE2K_CR+0x1f, In_Byte(NE2K_CR+0x1f));
+
+ Install_IRQ(NE2K_IRQ, NE2K_Interrupt_Handler);
+ Enable_IRQ(NE2K_IRQ);
+
+ for(i = 0; i < 4; i++)
+ {
+ NE2K_Transmit(regs);
+ PrintBoth("Transmitting a packet\n");
+ }
+
+ return 0;
+}
+int NE2K_Transmit(struct NE2K_REGS *regs)
+{
+ uint_t packet_size = 80;
+ *(uint_t *)regs->cr = 0x21;
+ regs->cr->stp = 0x0; //toggle start on
+ regs->cr->sta = 0x1;
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+
+ // Read-before-write bug fix?
+ Out_Byte(NE2K_RBCR0, 0x42);
+ Out_Byte(NE2K_RBCR1, 0x00);
+ Out_Byte(NE2K_RSAR0, 0x42);
+ Out_Byte(NE2K_RSAR1, 0x00);
+
+ regs->cr->rd = 0x01; //set remote DMA to 'remote read'
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+
+ *(uint_t*)regs->isr = 0x40; //clear and set Remote DMA high
+ Out_Byte(NE2K_ISR, *(uint_t *)regs->isr);
+
+ Out_Byte(NE2K_RBCR0, packet_size);
+ Out_Byte(NE2K_RBCR1, 0x00);
+
+ Out_Byte(NE2K_TBCR0, packet_size);
+ Out_Byte(NE2K_TBCR1, 0x00);
+
+ Out_Byte(NE2K_RSAR0, 0x00);
+ Out_Byte(NE2K_RSAR1, 0x40);
+
+ *(uint_t*)regs->cr = 0x16;
+ Out_Byte(NE2K_CR, *(uint_t *)regs->cr);
+
+ /* Begin pushing the packet into the dataport (located at 0x10 from the base address) */
+ /* Destination address = 52:54:00:12:34:56 */
+ Out_Word(NE2K_CR+0x10, 0x5452);
+ Out_Word(NE2K_CR+0x10, 0x1200);
+ Out_Word(NE2K_CR+0x10, 0x5634);
+
+ /* Source address = 52:54:00:12:34:58 */
+ Out_Word(NE2K_CR+0x10, 0x5452);
+ Out_Word(NE2K_CR+0x10, 0x1200);
+ Out_Word(NE2K_CR+0x10, 0x5834);
+
+ /* Type length and data; currently random data */
+ uint_t i;
+ uint_t n = 0;
+ for(i = 1; i <= packet_size/2-12; i++, n+=2) {
+ //Out_Word(NE2K_CR+0x10, 0x0f0b);
+ Out_Word(NE2K_CR+0x10, (n<<8) | (n+1));
+ }
+
+ Out_Byte(NE2K_ISR, 0x40);
+
+ return 0;
+}
+
+int NE2K_Receive()
+{
+ PrintBoth("Packet Received\n");
+
+ uint_t packet_size = 80;
+
+ Out_Byte(NE2K_CR, 0x22);
+ Out_Byte(NE2K_RBCR0, packet_size);
+ Out_Byte(NE2K_RBCR1, 0x00);
+// Out_Byte(NE2K_RSAR0, 0x42);
+ Out_Byte(NE2K_RSAR0, 0x4c);
+ Out_Byte(NE2K_RSAR1, 0x00);
+ Out_Byte(NE2K_CR, 0x0a);
+
+ uint_t i;
+ uint_t data;
+ PrintBoth("\nPacket data:\n\t");
+
+ for(i = 0; i < packet_size; i+=2) {
+ data = In_Word(NE2K_CR + 0x10);
+ PrintBoth("%x ", data);
+ if(!(i%10))
+ PrintBoth("\n\t");
+ }
+
+ PrintBoth("\n%d packets have been received", ++received);
+ PrintBoth("\n\n");
+
+ Out_Byte(NE2K_ISR, 0x40);
+
+ return 0;
+}
+
+
+//int NE2K_Ringbuff_Overflow(){
+
+
