1 #include <geekos/ne2k.h>
2 #include <geekos/debug.h>
4 #include <geekos/irq.h>
5 #include <geekos/malloc.h>
6 #include <geekos/string.h>
9 #define TX_START_BUFF 0x40
10 #define RX_START_BUFF 0x4c
11 #define RX_END_BUFF 0x80
13 uint_t next = (RX_START_BUFF << 8);
14 static uint_t received = 0;
15 static uint_t send_done = 1;
18 int (*packet_received)(struct NE2K_Packet_Info *info, uchar_t *packet);
21 static void Dump_Registers()
24 PrintBoth("Dumping NIC registers for page %x...\n", (In_Byte(NE2K_CR) & 0xc0) >> 6);
26 for(i = 0; i <= 0x0f; i += 0x01) {
27 data = In_Byte(NE2K_BASE_ADDR+i);
28 PrintBoth("\t%x: %x\n", NE2K_BASE_ADDR + i, data);
32 static int NE2K_Transmit(struct NE2K_REGS *regs)
37 struct _CR * cr = (struct _CR*)&(regs->cr);
38 uint_t packet_size = 80;
40 cr->stp = 0x0; //toggle start on
42 Out_Byte(NE2K_CR, regs->cr);
44 // Read-before-write bug fix?
45 Out_Byte(NE2K_RBCR0, 0x42);
46 Out_Byte(NE2K_RBCR1, 0x00);
47 Out_Byte(NE2K_RSAR0, 0x42);
48 Out_Byte(NE2K_RSAR1, 0x00);
50 cr->rd = 0x01; // set remote DMA to 'remote read'
51 Out_Byte(NE2K_CR, regs->cr);
53 regs->isr = 0x40; // clear and set Remote DMA high
54 Out_Byte(NE2K_ISR, regs->isr);
56 Out_Byte(NE2K_RBCR0, packet_size);
57 Out_Byte(NE2K_RBCR1, 0x00);
59 Out_Byte(NE2K_TBCR0, packet_size);
60 Out_Byte(NE2K_TBCR1, 0x00);
62 Out_Byte(NE2K_RSAR0, 0x00);
63 Out_Byte(NE2K_RSAR1, 0x40);
66 Out_Byte(NE2K_CR, regs->cr);
68 /* Begin pushing the packet into the dataport (located at 0x10 from the base address) */
69 /* Destination address = 52:54:00:12:34:56 */
70 Out_Word(NE2K_CR+0x10, 0x5452);
71 Out_Word(NE2K_CR+0x10, 0x1200);
72 Out_Word(NE2K_CR+0x10, 0x5634);
74 /* Source address = 52:54:00:12:34:58 */
75 Out_Word(NE2K_CR+0x10, 0x5452);
76 Out_Word(NE2K_CR+0x10, 0x1200);
77 Out_Word(NE2K_CR+0x10, 0x5834);
79 /* Type length and data; currently random data */
82 for(i = 1; i <= packet_size/2-12; i++, n+=2) {
83 //Out_Word(NE2K_CR+0x10, 0x0f0b);
84 Out_Word(NE2K_CR+0x10, (n<<8) | (n+1));
88 //Out_Byte(NE2K_ISR, regs->isr); /* Do we need this here? */
93 static void NE2K_Interrupt_Handler(struct Interrupt_State * state)
96 PrintBoth("NIC Interrupt Occured!\n");
97 uchar_t isr_content = In_Byte(NE2K_ISR);
99 PrintBoth("Contents of ISR: %x\n", isr_content);
101 if(isr_content & 0x01) /* A packet has been received. */
105 Out_Byte(NE2K_CR, 0x4a);
106 current = In_Byte(NE2K_CURR);
107 Out_Byte(NE2K_CR, 0x0a);
109 Out_Byte(NE2K_ISR, 0x01);*/
110 /* If BNRY and CURR aren't equal, more than one packet has been received. */
111 //}while (current > In_Byte(NE2K_BNRY));
112 Out_Byte(NE2K_CR, 0x4a);
113 current = In_Byte(NE2K_CURR);
114 Out_Byte(NE2K_CR, 0x0a);
116 if(current == In_Byte(NE2K_BNRY))
117 /* When CURR equals BNRY, all packets in the receive ring buffer have been read. */
118 Out_Byte(NE2K_ISR, 0x01); /* Clear the packet received bit of the Interrupt Register. */
122 if(isr_content & 0x02) /* A packet has been successfully transmitted. */
125 Out_Byte(NE2K_ISR, 0x02);
128 //Out_Byte(NE2K_ISR, 0xff); /* Clear all interrupts. */
131 int Init_Ne2k(int (*rcvd_fn)(struct NE2K_Packet_Info *info, uchar_t *packet))
133 callbacks.packet_received = rcvd_fn;
135 PrintBoth("Initializing network card...\n");
136 Out_Byte(NE2K_CR+0x1f, In_Byte(NE2K_CR+0x1f)); /* Reset? */
138 struct NE2K_REGS* regs = Malloc(sizeof(struct NE2K_REGS));
139 struct _CR * cr = (struct _CR *)&(regs->cr);
140 struct _RCR * rcr = (struct _RCR*)&(regs->rcr);
141 struct _IMR * imr = (struct _IMR *)&(regs->imr);
144 regs->dcr = 0x49; /* Word-wide DMA transfer. */
145 regs->isr = 0xff; /* Clear all interrupts. */
146 regs->rcr = 0x20; /* Accept packets shorter than 64 bytes. */
147 regs->tcr = 0x02; /* Internal loopback mode. */
149 Out_Byte(NE2K_CR, regs->cr);
150 Out_Byte(NE2K_DCR, regs->dcr);
151 Out_Byte(NE2K_ISR, regs->isr);
152 Out_Byte(NE2K_RCR, regs->rcr);
153 Out_Byte(NE2K_TCR, regs->tcr);
154 Out_Byte(NE2K_IMR, regs->imr);
156 /* Remote byte count registers. */
157 Out_Byte(NE2K_RBCR0, 0x00);
158 Out_Byte(NE2K_RBCR1, 0x00);
159 /* Remote start address registers. */
160 Out_Byte(NE2K_RSAR0, 0x00);
161 Out_Byte(NE2K_RSAR1, 0x00);
163 Out_Byte(NE2K_TPSR, TX_START_BUFF); /* Transmit page start register */
164 Out_Byte(NE2K_PSTART, RX_START_BUFF); /* Page start register */
165 Out_Byte(NE2K_PSTOP, RX_END_BUFF); /* Page stop register */
166 Out_Byte(NE2K_BNRY, RX_START_BUFF); /* Boundary register */
168 cr->ps = 0x01; /* Switch to reg page 1. */
169 Out_Byte(NE2K_CR, regs->cr);
170 /* Current page register: points to first free page that can be used for packet reception. */
171 Out_Byte(NE2K_CURR, RX_START_BUFF);
172 cr->ps = 0x00; /* Switch to page 0 */
174 Out_Byte(NE2K_CR, regs->cr);
175 Out_Byte(NE2K_ISR, regs->isr);
177 /* Interrupt mask register: setting a bit to 1 enables the
178 corresponding interrupt in ISR. */
185 Out_Byte(NE2K_IMR, regs->imr);
187 cr->ps = 0x01; /* Switch to reg page 1 */
188 Out_Byte(NE2K_CR, regs->cr);
190 /* Set the physical address of the card to 52:54:00:12:34:58 */
191 Out_Byte(NE2K_CR+0x01, 0x52);
192 Out_Byte(NE2K_CR+0x02, 0x54);
193 Out_Byte(NE2K_CR+0x03, 0x00);
194 Out_Byte(NE2K_CR+0x04, 0x12);
195 Out_Byte(NE2K_CR+0x05, 0x34);
196 Out_Byte(NE2K_CR+0x06, 0x58);
198 /* Set the multicast address register to all 1s; accepts all multicast packets */
200 for(i = 0x08; i <= 0x0f; i++) {
201 Out_Byte(NE2K_CR+i, 0xff);
204 regs->cr = 0x21; //set CR to start value
205 Out_Byte(NE2K_CR, regs->cr);
208 Out_Byte(NE2K_TCR, regs->tcr);
214 rcr->pro = 0x1; /* Promiscuous mode: accept all packets. */
216 Out_Byte(NE2K_RCR, regs->rcr);
218 cr->sta = 0x1; // toggle start bit
220 Out_Byte(NE2K_CR, regs->cr);
225 Out_Byte(NE2K_CR, regs->cr);
229 Out_Byte(NE2K_CR, regs->cr);
233 Out_Byte(NE2K_CR, regs->cr);
235 Install_IRQ(NE2K_IRQ, NE2K_Interrupt_Handler);
236 Enable_IRQ(NE2K_IRQ);
238 for(i = 0; i < 0; i++)
241 PrintBoth("Transmitting a packet\n");
244 uchar_t src_addr[6] = { 0x52, 0x54, 0x00, 0x12, 0x34, 0x58 };
245 uchar_t dest_addr[6] = { 0x52, 0x54, 0x00, 0x12, 0x34, 0x56 };
248 uchar_t *data = Malloc(size);
249 data = "This is a 64-byte string that will be used to test transmission.";
251 for(i = 0; i < 0; i++) {
252 NE2K_Send(regs, src_addr, dest_addr, 0x01, data, size);
255 //Free(data); // Why does this crash?
260 /* Assumes src and dest are arrays of 6 characters. */
261 int NE2K_Send(struct NE2K_REGS *regs, uchar_t src[], uchar_t dest[], uint_t type, uchar_t *data, uint_t size)
263 struct _CR * cr = (struct _CR*)&(regs->cr);
264 uint_t packet_size = size + 16;
266 cr->stp = 0x0; //toggle start on
268 Out_Byte(NE2K_CR, regs->cr);
270 // Read-before-write bug fix?
271 Out_Byte(NE2K_RBCR0, 0x42);
272 Out_Byte(NE2K_RBCR1, 0x00);
273 Out_Byte(NE2K_RSAR0, 0x42);
274 Out_Byte(NE2K_RSAR1, 0x00);
276 cr->rd = 0x01; // set remote DMA to 'remote read'
277 Out_Byte(NE2K_CR, regs->cr);
279 regs->isr = 0x40; // clear and set Remote DMA high
280 Out_Byte(NE2K_ISR, regs->isr);
282 /* Set remote byte count registers */
283 Out_Byte(NE2K_RBCR0, packet_size & 0xff);
284 Out_Byte(NE2K_RBCR1, (packet_size >> 8) & 0xff);
286 /* Set transmit byte count registers. */
287 Out_Byte(NE2K_TBCR0, packet_size & 0xff);
288 Out_Byte(NE2K_TBCR1, (packet_size >> 8) & 0xff);
290 Out_Byte(NE2K_RSAR0, 0x00);
291 Out_Byte(NE2K_RSAR1, TX_START_BUFF);
294 Out_Byte(NE2K_CR, regs->cr);
296 /* Destination Address */
297 Out_Word(NE2K_CR + 0x10, (dest[1] << 8) | dest[0]);
298 Out_Word(NE2K_CR + 0x10, (dest[3] << 8) | dest[2]);
299 Out_Word(NE2K_CR + 0x10, (dest[5] << 8) | dest[4]);
302 Out_Word(NE2K_CR + 0x10, (src[1] << 8) | src[0]);
303 Out_Word(NE2K_CR + 0x10, (src[3] << 8) | src[2]);
304 Out_Word(NE2K_CR + 0x10, (src[5] << 8) | src[4]);
307 Out_Word(NE2K_CR + 0x10, packet_size);
310 for(i = 0; i < size; i += 2) {
311 Out_Word(NE2K_CR + 0x10, (*(data + i + 1) << 8) | *(data + i));
319 PrintBoth("Packet Received\n");
321 Out_Byte(NE2K_CR, 0x22);
322 /* Set RSAR to the start address of the received packet. */
323 Out_Byte(NE2K_RSAR0, next & 0xff);
324 Out_Byte(NE2K_RSAR1, next >> 8);
325 Out_Byte(NE2K_CR, 0x0a);
328 * A four byte header is added to the beginning of each received packet by the NIC.
329 * The first byte is the location of the next packet in the ring buffer.
330 * The second byte is the receive status code.
331 * The third and fourth bytes are the size of the packet.
336 PrintBoth("\nPacket data:\n\t");
338 data = In_Word(NE2K_CR + 0x10);
339 PrintBoth("%x ", data);
341 /* Get the location of the next packet */
342 next = data & 0xff00;
344 /* Retrieve the packet size from the header, and store it in RBCR. */
345 uint_t packet_size = In_Word(NE2K_CR + 0x10) - 4;
346 uchar_t *packet = Malloc(packet_size);
347 Out_Byte(NE2K_RBCR0, packet_size & 0xff);
348 Out_Byte(NE2K_RBCR1, (packet_size>>8) & 0xff);
351 PrintBoth("packetsize = %x\n\t", packet_size);
354 /* Copy the received packet over from the ring buffer. */
355 for(i = 0; i < packet_size; i+=2) {
356 data = In_Word(NE2K_CR + 0x10);
357 //PrintBoth("%x ", data);
358 *(packet + i) = data & 0x00ff;
359 *(packet + i + 1) = (data & 0xff00) >> 8;
361 PrintBoth("BNRY = %x\n", In_Byte(NE2K_BNRY));
362 Out_Byte(NE2K_CR, 0x4a);
363 PrintBoth("CURR = %x\n", In_Byte(NE2K_CURR));
364 Out_Byte(NE2K_CR, 0x0a);
371 //Out_Byte(NE2K_RBCR0, (In_Byte(NE2K_RBCR0))-2);
372 //Out_Byte(NE2K_RSAR0, (In_Byte(NE2K_RSAR0))+2);
374 PrintBoth("\n%d packets have been received", ++received);
377 Out_Byte(NE2K_ISR, 0x40); /* Clear the remote DMA complete interrupt. */
379 /* The BNRY register stores the location of the first packet that hasn't been read yet */
380 Out_Byte(NE2K_BNRY, next >> 8);
382 struct NE2K_Packet_Info *info = Malloc(sizeof(struct NE2K_Packet_Info));
383 info->size = packet_size;
385 memcpy(info->dest, packet, 6);
386 memcpy(info->src, packet + 6, 6);
387 callbacks.packet_received(info, packet);