#include <geekos/malloc.h>
#define DEBUG 1
+#define TX_START_BUFF 0x40
#define RX_START_BUFF 0x4c
+
+uint_t next = (RX_START_BUFF << 8);
static uint_t received = 0;
static uint_t send_done = 1;
-uint_t next = (RX_START_BUFF<<8);
static void Dump_Registers()
{
// Out_Byte(NE2K_ISR, 0xff); /* Clear all interrupts */
PrintBoth("Contents of ISR: %x\n", isr_content);
- if(isr_content & 0x01)
- {
- NE2K_Receive();
- Out_Byte(NE2K_ISR, 0x01);
-}
+
+ if(isr_content & 0x01) /* A packet has been received. */
+ {
+ uchar_t current;
+ do{
+ Out_Byte(NE2K_CR, 0x4a);
+ current = In_Byte(NE2K_CURR);
+ Out_Byte(NE2K_CR, 0x0a);
+ NE2K_Receive();
+ Out_Byte(NE2K_ISR, 0x01);
+ /* If BNRY and CURR aren't equal, more than one packet has been received. */
+ }while (current > In_Byte(NE2K_BNRY));
+ }
End_IRQ(state);
- if(isr_content & 0x02)
+ if(isr_content & 0x02) /* A packet has been successfully transmitted. */
+ {
send_done = 1;
-
+ Out_Byte(NE2K_ISR, 0x02);
+ }
+ Out_Byte(NE2K_ISR, 0xff); /* Clear all interrupts. */
}
int Init_Ne2k()
struct _IMR * imr = (struct _IMR *)&(regs->imr);
regs->cr = 0x21;
- regs->dcr = 0x49;
- regs->isr = 0xff;
- regs->rcr = 0x20;
- regs->tcr = 0x02;
+ regs->dcr = 0x49; /* Word-wide DMA transfer. */
+ regs->isr = 0xff; /* Clear all interrupts. */
+ regs->rcr = 0x20; /* Accept packets shorter than 64 bytes. */
+ regs->tcr = 0x02; /* Internal loopback mode. */
Out_Byte(NE2K_CR, regs->cr);
Out_Byte(NE2K_DCR, regs->dcr);
Out_Byte(NE2K_TCR, regs->tcr);
Out_Byte(NE2K_IMR, regs->imr);
+ /* Remote byte count registers. */
Out_Byte(NE2K_RBCR0, 0x00);
Out_Byte(NE2K_RBCR1, 0x00);
+ /* Remote start address registers. */
Out_Byte(NE2K_RSAR0, 0x00);
Out_Byte(NE2K_RSAR1, 0x00);
- Out_Byte(NE2K_TPSR, 0x40); // Set TPSR
- Out_Byte(NE2K_PSTART, RX_START_BUFF); // Set PSTART
- Out_Byte(NE2K_BNRY, 0x59); // Set BNRY
- Out_Byte(NE2K_PSTOP, 0x80); // Set PSTOP
+ Out_Byte(NE2K_TPSR, TX_START_BUFF); /* Transmit page start register */
+ Out_Byte(NE2K_PSTART, RX_START_BUFF); /* Page start register */
+// Out_Byte(NE2K_BNRY, 0x59); /* Boundary register */
+ Out_Byte(NE2K_PSTOP, 0x80); /* Page stop register */
- cr->ps = 0x01; //switch to reg page 1
+ cr->ps = 0x01; /* Switch to reg page 1. */
Out_Byte(NE2K_CR, regs->cr);
+ /* Current page register: points to first free page that can be used for packet reception. */
Out_Byte(NE2K_CURR, RX_START_BUFF);
- cr->ps = 0x00;
+ cr->ps = 0x00; /* Switch to page 0 */
Out_Byte(NE2K_CR, regs->cr);
- Out_Byte(NE2K_BNRY, RX_START_BUFF);
+ Out_Byte(NE2K_BNRY, RX_START_BUFF);
Out_Byte(NE2K_ISR, regs->isr);
+ /* Interrupt mask register: setting a bit to 1 enables the
+ corresponding interrupt in ISR. */
imr->prxe = 0x1;
imr->ptxe = 0x1;
imr->rxee = 0x1;
imr->cnte = 0x1;
Out_Byte(NE2K_IMR, regs->imr);
- cr->ps = 0x01; //switch to reg page 1
+ cr->ps = 0x01; /* Switch to reg page 1 */
Out_Byte(NE2K_CR, regs->cr);
/* Set the physical address of the card to 52:54:00:12:34:58 */
Out_Byte(NE2K_CR+0x05, 0x34);
Out_Byte(NE2K_CR+0x06, 0x58);
- /* Accept all multicast packets */
+ /* Set the multicast address registr to all 1s; accepts all multicast packets */
uint_t i;
for(i = 0x08; i <= 0x0f; i++) {
Out_Byte(NE2K_CR+i, 0xff);
rcr->ar = 0x1;
rcr->ab = 0x1;
rcr->am = 0x1;
- rcr->pro = 0x1; // promiscuous mode, accept all packets
+ rcr->pro = 0x1; /* Promiscuous mode: accept all packets. */
rcr->mon = 0x0;
Out_Byte(NE2K_RCR, regs->rcr);
Install_IRQ(NE2K_IRQ, NE2K_Interrupt_Handler);
Enable_IRQ(NE2K_IRQ);
/*
- for(i = 0; i < 1; i++)
+ for(i = 0; i < 2; i++)
{
NE2K_Transmit(regs);
PrintBoth("Transmitting a packet\n");
}
-*/
+*/
+
+ uchar_t src_addr[6] = { 0x52, 0x54, 0x00, 0x12, 0x34, 0x58 };
+ uchar_t dest_addr[6] = { 0x52, 0x54, 0x00, 0x12, 0x34, 0x56 };
+
+ uint_t size = 64;
+ uchar_t *data = Malloc(size);
+ data = "This is a 64-byte string that will be used to test transmission.";
+
+ for(i = 0; i < 4; i++) {
+ NE2K_Send(regs, src_addr, dest_addr, 0x01, data, size);
+ }
+
+ Free(data);
+
+ return 0;
+}
+
+/* Assumes src and dest are arrays of 6 characters. */
+int NE2K_Send(struct NE2K_REGS *regs, uchar_t src[], uchar_t dest[], uint_t type, uchar_t *data, uint_t size)
+{
+ struct _CR * cr = (struct _CR*)&(regs->cr);
+ uint_t packet_size = size + 16;
+ regs->cr = 0x21;
+ cr->stp = 0x0; //toggle start on
+ cr->sta = 0x1;
+ Out_Byte(NE2K_CR, 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);
+
+ cr->rd = 0x01; // set remote DMA to 'remote read'
+ Out_Byte(NE2K_CR, regs->cr);
+
+ regs->isr = 0x40; // clear and set Remote DMA high
+ Out_Byte(NE2K_ISR, regs->isr);
+
+ /* Set remote byte count registers */
+ Out_Byte(NE2K_RBCR0, packet_size & 0xff);
+ Out_Byte(NE2K_RBCR1, (packet_size >> 8) & 0xff);
+
+ /* Set transmit byte count registers. */
+ Out_Byte(NE2K_TBCR0, packet_size & 0xff);
+ Out_Byte(NE2K_TBCR1, (packet_size >> 8) & 0xff);
+
+ Out_Byte(NE2K_RSAR0, 0x00);
+ Out_Byte(NE2K_RSAR1, TX_START_BUFF);
+
+ regs->cr = 0x16;
+ Out_Byte(NE2K_CR, regs->cr);
+
+ /* Destination Address */
+ Out_Word(NE2K_CR + 0x10, (dest[1] << 8) | dest[0]);
+ Out_Word(NE2K_CR + 0x10, (dest[3] << 8) | dest[2]);
+ Out_Word(NE2K_CR + 0x10, (dest[5] << 8) | dest[4]);
+
+ /* Source Address */
+ Out_Word(NE2K_CR + 0x10, (src[1] << 8) | src[0]);
+ Out_Word(NE2K_CR + 0x10, (src[3] << 8) | src[2]);
+ Out_Word(NE2K_CR + 0x10, (src[5] << 8) | src[4]);
+
+ /* Type */
+ Out_Word(NE2K_CR + 0x10, packet_size);
+
+ uint_t i;
+ for(i = 0; i < size; i += 2) {
+ Out_Word(NE2K_CR + 0x10, (*(data + i + 1) << 8) | *(data + i));
+ }
+
return 0;
}
{
PrintBoth("Packet Received\n");
-// uint_t packet_size = 80;
-
Out_Byte(NE2K_CR, 0x22);
Out_Byte(NE2K_RBCR1, 0x00);
Out_Byte(NE2K_RSAR0, next & 0xff);
Out_Byte(NE2K_CR, 0x0a);
+ /*
+ * A four byte header is added to the beginning of each received packet.
+ * The first byte is the location of the next packet in the ring buffer.
+ * The second byte is the receive status code.
+ * The third and fourth bytes are the size of the packet.
+ */
+
uint_t i;
uint_t data;
PrintBoth("\nPacket data:\n\t");
data = In_Word(NE2K_CR + 0x10);
PrintBoth("%x ", data);
- /* The first byte is the page number where the next packet in the ring buffer is stored */
+ /* Get the location of the next packet */
next = data & 0xff00;
uint_t packet_size = In_Word(NE2K_CR + 0x10) - 4;
PrintBoth("packetsize = %x\n\t", packet_size);
#endif
- for(i = 2; i < packet_size; i+=2) {
+ /* Copy the received packet over from the ring buffer. */
+ for(i = 0; i < packet_size; i+=2) {
data = In_Word(NE2K_CR + 0x10);
PrintBoth("%x ", data);
return 0;
}
+
+
+
