#include <geekos/io.h>
#include <geekos/irq.h>
#include <geekos/malloc.h>
+#include <geekos/string.h>
#define DEBUG 1
-#define RX_START_BUFF 0x4c
+#define TX_START_BUFF 0x40
+#define RX_START_BUFF 0x4c
+#define RX_END_BUFF 0x80
+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);
+struct NE2K_REGS* regs;
+
+struct callback {
+ int (*packet_received)(struct NE2K_Packet_Info *info, uchar_t *packet);
+} callbacks;
+
+#if DEBUG
static void Dump_Registers()
{
uint_t data;
PrintBoth("\t%x: %x\n", NE2K_BASE_ADDR + i, data);
}
}
+#endif
+#if 0
+static int NE2K_Transmit(struct NE2K_REGS *regs)
+{
+ while(!send_done);
+ send_done = 0;
+
+ struct _CR * cr = (struct _CR*)&(regs->cr);
+ uint_t packet_size = 80;
+ 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);
+
+ 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);
+
+ regs->cr = 0x16;
+ Out_Byte(NE2K_CR, 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));
+ }
+
+ //regs->isr = 0x40;
+ //Out_Byte(NE2K_ISR, regs->isr); /* Do we need this here? */
+
+ return 0;
+}
+#endif
static void NE2K_Interrupt_Handler(struct Interrupt_State * state)
{
Begin_IRQ(state);
PrintBoth("NIC Interrupt Occured!\n");
uchar_t isr_content = In_Byte(NE2K_ISR);
- // 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;
+ Out_Byte(NE2K_CR, 0x4a); /* Page 1 */
+ current = In_Byte(NE2K_CURR);
+ Out_Byte(NE2K_CR, 0x0a); /* Page 0 */
+ NE2K_Receive();
+
+ /* When CURR equals BNRY, all packets in the receive ring buffer have been read, and
+ the packet received bit in the interrupt status register can be cleared. */
+ if(current == In_Byte(NE2K_BNRY))
+ Out_Byte(NE2K_ISR, 0x01);
+ }
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()
+int Init_Ne2k(int (*rcvd_fn)(struct NE2K_Packet_Info *info, uchar_t *packet))
{
+ callbacks.packet_received = rcvd_fn;
+
PrintBoth("Initializing network card...\n");
Out_Byte(NE2K_CR+0x1f, In_Byte(NE2K_CR+0x1f)); /* Reset? */
- struct NE2K_REGS* regs = Malloc(sizeof(struct NE2K_REGS));
+ regs = Malloc(sizeof(struct NE2K_REGS));
struct _CR * cr = (struct _CR *)&(regs->cr);
struct _RCR * rcr = (struct _RCR*)&(regs->rcr);
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_PSTOP, RX_END_BUFF); /* Page stop register */
+ Out_Byte(NE2K_BNRY, RX_START_BUFF); /* Boundary 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_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 register 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);
cr->sta = 0x1; // toggle start bit
cr->stp = 0x0;
Out_Byte(NE2K_CR, regs->cr);
-
+
+#if DEBUG
Dump_Registers();
- cr->ps = NE2K_PAGE1;
+ cr->ps = 0x01;
Out_Byte(NE2K_CR, regs->cr);
Dump_Registers();
- cr->ps = NE2K_PAGE2;
+ cr->ps = 0x02;
Out_Byte(NE2K_CR, regs->cr);
Dump_Registers();
- cr->ps = NE2K_PAGE0;
+ cr->ps = 0x00;
Out_Byte(NE2K_CR, regs->cr);
-
- // Reset?
-// Out_Byte(NE2K_CR+0x1f, In_Byte(NE2K_CR+0x1f));
+#endif
Install_IRQ(NE2K_IRQ, NE2K_Interrupt_Handler);
Enable_IRQ(NE2K_IRQ);
-/*
- for(i = 0; i < 1; i++)
+#if 0
+ for(i = 0; i < 0; i++)
{
NE2K_Transmit(regs);
PrintBoth("Transmitting a packet\n");
}
-*/
+#endif
+/*
+ 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 < 0; i++) {
+ NE2K_Send(regs, src_addr, dest_addr, 0x01, data, size);
+ }
+*/
+ //Free(data); // Why does this crash?
+
return 0;
}
-int NE2K_Transmit(struct NE2K_REGS *regs)
+/* Assumes src and dest are arrays of 6 characters. */
+int NE2K_Send(uchar_t src[], uchar_t dest[], uint_t type, uchar_t *data, uint_t size)
{
- while(!send_done);
- send_done = 0;
-
struct _CR * cr = (struct _CR*)&(regs->cr);
- uint_t packet_size = 80;
+ uint_t packet_size = size + 16;
regs->cr = 0x21;
cr->stp = 0x0; //toggle start on
cr->sta = 0x1;
regs->isr = 0x40; // clear and set Remote DMA high
Out_Byte(NE2K_ISR, regs->isr);
- Out_Byte(NE2K_RBCR0, packet_size);
- Out_Byte(NE2K_RBCR1, 0x00);
+ /* Set remote byte count registers */
+ Out_Byte(NE2K_RBCR0, packet_size & 0xff);
+ Out_Byte(NE2K_RBCR1, (packet_size >> 8) & 0xff);
- Out_Byte(NE2K_TBCR0, packet_size);
- Out_Byte(NE2K_TBCR1, 0x00);
+ /* 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, 0x40);
+ Out_Byte(NE2K_RSAR1, TX_START_BUFF);
regs->cr = 0x16;
Out_Byte(NE2K_CR, 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);
+ /* 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 = 52:54:00:12:34:58 */
- Out_Word(NE2K_CR+0x10, 0x5452);
- Out_Word(NE2K_CR+0x10, 0x1200);
- Out_Word(NE2K_CR+0x10, 0x5834);
+ /* 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);
- /* 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));
+ for(i = 0; i < size; i += 2) {
+ Out_Word(NE2K_CR + 0x10, (*(data + i + 1) << 8) | *(data + i));
}
- //regs->isr = 0x40;
- //Out_Byte(NE2K_ISR, regs->isr); /* Do we need this here? */
-
return 0;
}
{
PrintBoth("Packet Received\n");
-// uint_t packet_size = 80;
-
Out_Byte(NE2K_CR, 0x22);
-
- Out_Byte(NE2K_RBCR1, 0x00);
-// Out_Byte(NE2K_RBCR0, 0x60);
-
-// Out_Byte(NE2K_RSAR0, 0x42);
- Out_Byte(NE2K_RSAR1, next >> 8);
+ /* Set RSAR to the start address of the received packet. */
Out_Byte(NE2K_RSAR0, next & 0xff);
+ Out_Byte(NE2K_RSAR1, next >> 8);
Out_Byte(NE2K_CR, 0x0a);
+ /*
+ * A four byte header is added to the beginning of each received packet by the NIC.
+ * 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;
+ /* Retrieve the packet size from the header, and store it in RBCR. */
uint_t packet_size = In_Word(NE2K_CR + 0x10) - 4;
+ uchar_t *packet = Malloc(packet_size);
Out_Byte(NE2K_RBCR0, packet_size & 0xff);
Out_Byte(NE2K_RBCR1, (packet_size>>8) & 0xff);
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);
-
+ *(packet + i) = data & 0x00ff;
+ *(packet + i + 1) = (data & 0xff00) >> 8;
#if 0
PrintBoth("BNRY = %x\n", In_Byte(NE2K_BNRY));
Out_Byte(NE2K_CR, 0x4a);
PrintBoth("CURR = %x\n", In_Byte(NE2K_CURR));
Out_Byte(NE2K_CR, 0x0a);
#endif
-
- if(!(i%10))
- PrintBoth("\n\t");
}
//Out_Byte(NE2K_RBCR0, (In_Byte(NE2K_RBCR0))-2);
PrintBoth("\n%d packets have been received", ++received);
PrintBoth("\n\n");
- Out_Byte(NE2K_ISR, 0x40);
+ Out_Byte(NE2K_ISR, 0x40); /* Clear the remote DMA complete interrupt. */
/* The BNRY register stores the location of the first packet that hasn't been read yet */
Out_Byte(NE2K_BNRY, next >> 8);
+ struct NE2K_Packet_Info *info = Malloc(sizeof(struct NE2K_Packet_Info));
+ info->size = packet_size;
+ info->status = 0;
+ memcpy(info->dest, packet, 6);
+ memcpy(info->src, packet + 6, 6);
+ callbacks.packet_received(info, packet);
+
return 0;
}
+
+
+
