2 * QEMU NE2000 emulation
4 * Copyright (c) 2003-2004 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
41 #include <netinet/in.h>
46 /* debug NE2000 card */
47 //#define DEBUG_NE2000
49 /***********************************************************/
50 /* ne2000 emulation */
52 #define E8390_CMD 0x00 /* The command register (for all pages) */
53 /* Page 0 register offsets. */
54 #define EN0_CLDALO 0x01 /* Low byte of current local dma addr RD */
55 #define EN0_STARTPG 0x01 /* Starting page of ring bfr WR */
56 #define EN0_CLDAHI 0x02 /* High byte of current local dma addr RD */
57 #define EN0_STOPPG 0x02 /* Ending page +1 of ring bfr WR */
58 #define EN0_BOUNDARY 0x03 /* Boundary page of ring bfr RD WR */
59 #define EN0_TSR 0x04 /* Transmit status reg RD */
60 #define EN0_TPSR 0x04 /* Transmit starting page WR */
61 #define EN0_NCR 0x05 /* Number of collision reg RD */
62 #define EN0_TCNTLO 0x05 /* Low byte of tx byte count WR */
63 #define EN0_FIFO 0x06 /* FIFO RD */
64 #define EN0_TCNTHI 0x06 /* High byte of tx byte count WR */
65 #define EN0_ISR 0x07 /* Interrupt status reg RD WR */
66 #define EN0_CRDALO 0x08 /* low byte of current remote dma address RD */
67 #define EN0_RSARLO 0x08 /* Remote start address reg 0 */
68 #define EN0_CRDAHI 0x09 /* high byte, current remote dma address RD */
69 #define EN0_RSARHI 0x09 /* Remote start address reg 1 */
70 #define EN0_RCNTLO 0x0a /* Remote byte count reg WR */
71 #define EN0_RCNTHI 0x0b /* Remote byte count reg WR */
72 #define EN0_RSR 0x0c /* rx status reg RD */
73 #define EN0_RXCR 0x0c /* RX configuration reg WR */
74 #define EN0_TXCR 0x0d /* TX configuration reg WR */
75 #define EN0_COUNTER0 0x0d /* Rcv alignment error counter RD */
76 #define EN0_DCFG 0x0e /* Data configuration reg WR */
77 #define EN0_COUNTER1 0x0e /* Rcv CRC error counter RD */
78 #define EN0_IMR 0x0f /* Interrupt mask reg WR */
79 #define EN0_COUNTER2 0x0f /* Rcv missed frame error counter RD */
82 #define EN1_CURPAG 0x17
85 /* Register accessed at EN_CMD, the 8390 base addr. */
86 #define E8390_STOP 0x01 /* Stop and reset the chip */
87 #define E8390_START 0x02 /* Start the chip, clear reset */
88 #define E8390_TRANS 0x04 /* Transmit a frame */
89 #define E8390_RREAD 0x08 /* Remote read */
90 #define E8390_RWRITE 0x10 /* Remote write */
91 #define E8390_NODMA 0x20 /* Remote DMA */
92 #define E8390_PAGE0 0x00 /* Select page chip registers */
93 #define E8390_PAGE1 0x40 /* using the two high-order bits */
94 #define E8390_PAGE2 0x80 /* Page 3 is invalid. */
96 /* Bits in EN0_ISR - Interrupt status register */
97 #define ENISR_RX 0x01 /* Receiver, no error */
98 #define ENISR_TX 0x02 /* Transmitter, no error */
99 #define ENISR_RX_ERR 0x04 /* Receiver, with error */
100 #define ENISR_TX_ERR 0x08 /* Transmitter, with error */
101 #define ENISR_OVER 0x10 /* Receiver overwrote the ring */
102 #define ENISR_COUNTERS 0x20 /* Counters need emptying */
103 #define ENISR_RDC 0x40 /* remote dma complete */
104 #define ENISR_RESET 0x80 /* Reset completed */
105 #define ENISR_ALL 0x3f /* Interrupts we will enable */
107 /* Bits in received packet status byte and EN0_RSR*/
108 #define ENRSR_RXOK 0x01 /* Received a good packet */
109 #define ENRSR_CRC 0x02 /* CRC error */
110 #define ENRSR_FAE 0x04 /* frame alignment error */
111 #define ENRSR_FO 0x08 /* FIFO overrun */
112 #define ENRSR_MPA 0x10 /* missed pkt */
113 #define ENRSR_PHY 0x20 /* physical/multicast address */
114 #define ENRSR_DIS 0x40 /* receiver disable. set in monitor mode */
115 #define ENRSR_DEF 0x80 /* deferring */
117 /* Transmitted packet status, EN0_TSR. */
118 #define ENTSR_PTX 0x01 /* Packet transmitted without error */
119 #define ENTSR_ND 0x02 /* The transmit wasn't deferred. */
120 #define ENTSR_COL 0x04 /* The transmit collided at least once. */
121 #define ENTSR_ABT 0x08 /* The transmit collided 16 times, and was deferred. */
122 #define ENTSR_CRS 0x10 /* The carrier sense was lost. */
123 #define ENTSR_FU 0x20 /* A "FIFO underrun" occurred during transmit. */
124 #define ENTSR_CDH 0x40 /* The collision detect "heartbeat" signal was lost. */
125 #define ENTSR_OWC 0x80 /* There was an out-of-window collision. */
127 #define NE2000_MEM_SIZE 32768
129 typedef struct NE2000State {
142 uint8_t phys[6]; /* mac address */
144 uint8_t mult[8]; /* multicast mask array */
146 uint8_t mem[NE2000_MEM_SIZE];
149 static NE2000State ne2000_state;
152 static void ne2000_reset(NE2000State *s)
156 s->isr = ENISR_RESET;
166 /* duplicate prom data */
167 for(i = 15;i >= 0; i--) {
168 s->mem[2 * i] = s->mem[i];
169 s->mem[2 * i + 1] = s->mem[i];
173 static void ne2000_update_irq(NE2000State *s)
176 isr = s->isr & s->imr;
178 pic_set_irq(s->irq, 1);
180 pic_set_irq(s->irq, 0);
183 /* return true if the NE2000 can receive more data */
184 int ne2000_can_receive(void)
186 NE2000State *s = &ne2000_state;
187 int avail, index, boundary;
189 if (s->cmd & E8390_STOP)
191 index = s->curpag << 8;
192 boundary = s->boundary << 8;
193 if (index < boundary)
194 avail = boundary - index;
196 avail = (s->stop - s->start) - (index - boundary);
197 if (avail < (MAX_ETH_FRAME_SIZE + 4))
202 void ne2000_receive(uint8_t *buf, int size)
204 NE2000State *s = &ne2000_state;
206 int total_len, next, avail, len, index;
208 #if defined(DEBUG_NE2000)
209 printf("NE2000: received len=%d\n", size);
212 index = s->curpag << 8;
213 /* 4 bytes for header */
214 total_len = size + 4;
215 /* address for next packet (4 bytes for CRC) */
216 next = index + ((total_len + 4 + 255) & ~0xff);
218 next -= (s->stop - s->start);
219 /* prepare packet header */
221 p[0] = ENRSR_RXOK; /* receive status */
224 p[3] = total_len >> 8;
227 /* write packet data */
229 avail = s->stop - index;
233 memcpy(s->mem + index, buf, len);
236 if (index == s->stop)
240 s->curpag = next >> 8;
242 /* now we can signal we have receive something */
244 ne2000_update_irq(s);
247 static void ne2000_ioport_write(CPUState *env, uint32_t addr, uint32_t val)
249 NE2000State *s = &ne2000_state;
254 printf("NE2000: write addr=0x%x val=0x%02x\n", addr, val);
256 if (addr == E8390_CMD) {
257 /* control register */
259 if (val & E8390_START) {
260 /* test specific case: zero length transfert */
261 if ((val & (E8390_RREAD | E8390_RWRITE)) &&
264 ne2000_update_irq(s);
266 if (val & E8390_TRANS) {
267 net_send_packet(net_fd, s->mem + (s->tpsr << 8), s->tcnt);
268 /* signal end of transfert */
271 ne2000_update_irq(s);
276 offset = addr | (page << 4);
289 ne2000_update_irq(s);
295 s->tcnt = (s->tcnt & 0xff00) | val;
298 s->tcnt = (s->tcnt & 0x00ff) | (val << 8);
301 s->rsar = (s->rsar & 0xff00) | val;
304 s->rsar = (s->rsar & 0x00ff) | (val << 8);
307 s->rcnt = (s->rcnt & 0xff00) | val;
310 s->rcnt = (s->rcnt & 0x00ff) | (val << 8);
317 ne2000_update_irq(s);
319 case EN1_PHYS ... EN1_PHYS + 5:
320 s->phys[offset - EN1_PHYS] = val;
325 case EN1_MULT ... EN1_MULT + 7:
326 s->mult[offset - EN1_MULT] = val;
332 static uint32_t ne2000_ioport_read(CPUState *env, uint32_t addr)
334 NE2000State *s = &ne2000_state;
335 int offset, page, ret;
338 if (addr == E8390_CMD) {
342 offset = addr | (page << 4);
353 case EN1_PHYS ... EN1_PHYS + 5:
354 ret = s->phys[offset - EN1_PHYS];
359 case EN1_MULT ... EN1_MULT + 7:
360 ret = s->mult[offset - EN1_MULT];
368 printf("NE2000: read addr=0x%x val=%02x\n", addr, ret);
373 static void ne2000_asic_ioport_write(CPUState *env, uint32_t addr, uint32_t val)
375 NE2000State *s = &ne2000_state;
379 printf("NE2000: asic write val=0x%04x\n", val);
381 p = s->mem + s->rsar;
382 if (s->dcfg & 0x01) {
395 if (s->rsar == s->stop)
398 /* signal end of transfert */
400 ne2000_update_irq(s);
404 static uint32_t ne2000_asic_ioport_read(CPUState *env, uint32_t addr)
406 NE2000State *s = &ne2000_state;
410 p = s->mem + s->rsar;
411 if (s->dcfg & 0x01) {
413 ret = p[0] | (p[1] << 8);
423 if (s->rsar == s->stop)
426 /* signal end of transfert */
428 ne2000_update_irq(s);
431 printf("NE2000: asic read val=0x%04x\n", ret);
436 static void ne2000_reset_ioport_write(CPUState *env, uint32_t addr, uint32_t val)
438 /* nothing to do (end of reset pulse) */
441 static uint32_t ne2000_reset_ioport_read(CPUState *env, uint32_t addr)
443 NE2000State *s = &ne2000_state;
448 void ne2000_init(int base, int irq)
450 NE2000State *s = &ne2000_state;
452 register_ioport_write(base, 16, ne2000_ioport_write, 1);
453 register_ioport_read(base, 16, ne2000_ioport_read, 1);
455 register_ioport_write(base + 0x10, 1, ne2000_asic_ioport_write, 1);
456 register_ioport_read(base + 0x10, 1, ne2000_asic_ioport_read, 1);
457 register_ioport_write(base + 0x10, 2, ne2000_asic_ioport_write, 2);
458 register_ioport_read(base + 0x10, 2, ne2000_asic_ioport_read, 2);
460 register_ioport_write(base + 0x1f, 1, ne2000_reset_ioport_write, 1);
461 register_ioport_read(base + 0x1f, 1, ne2000_reset_ioport_read, 1);