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rtl8139: drop tautologous if (ip) {...} statement (CVE-2015-5165)
[qemu/ar7.git] / hw / net / dp8393x.c
blobab607e4846530dde04f98f47a439eb0ec0482c68
1 /*
2 * QEMU NS SONIC DP8393x netcard
3 *
4 * Copyright (c) 2008-2009 Herve Poussineau
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of
9 * the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "hw/sysbus.h"
21 #include "hw/devices.h"
22 #include "net/net.h"
23 #include "qemu/timer.h"
24 #include <zlib.h>
25
26 //#define DEBUG_SONIC
27
28 #define SONIC_PROM_SIZE 0x1000
29
30 #ifdef DEBUG_SONIC
31 #define DPRINTF(fmt, ...) \
32 do { printf("sonic: " fmt , ## __VA_ARGS__); } while (0)
33 static const char* reg_names[] = {
34 "CR", "DCR", "RCR", "TCR", "IMR", "ISR", "UTDA", "CTDA",
35 "TPS", "TFC", "TSA0", "TSA1", "TFS", "URDA", "CRDA", "CRBA0",
36 "CRBA1", "RBWC0", "RBWC1", "EOBC", "URRA", "RSA", "REA", "RRP",
37 "RWP", "TRBA0", "TRBA1", "0x1b", "0x1c", "0x1d", "0x1e", "LLFA",
38 "TTDA", "CEP", "CAP2", "CAP1", "CAP0", "CE", "CDP", "CDC",
39 "SR", "WT0", "WT1", "RSC", "CRCT", "FAET", "MPT", "MDT",
40 "0x30", "0x31", "0x32", "0x33", "0x34", "0x35", "0x36", "0x37",
41 "0x38", "0x39", "0x3a", "0x3b", "0x3c", "0x3d", "0x3e", "DCR2" };
42 #else
43 #define DPRINTF(fmt, ...) do {} while (0)
44 #endif
45
46 #define SONIC_ERROR(fmt, ...) \
47 do { printf("sonic ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
48
49 #define SONIC_CR 0x00
50 #define SONIC_DCR 0x01
51 #define SONIC_RCR 0x02
52 #define SONIC_TCR 0x03
53 #define SONIC_IMR 0x04
54 #define SONIC_ISR 0x05
55 #define SONIC_UTDA 0x06
56 #define SONIC_CTDA 0x07
57 #define SONIC_TPS 0x08
58 #define SONIC_TFC 0x09
59 #define SONIC_TSA0 0x0a
60 #define SONIC_TSA1 0x0b
61 #define SONIC_TFS 0x0c
62 #define SONIC_URDA 0x0d
63 #define SONIC_CRDA 0x0e
64 #define SONIC_CRBA0 0x0f
65 #define SONIC_CRBA1 0x10
66 #define SONIC_RBWC0 0x11
67 #define SONIC_RBWC1 0x12
68 #define SONIC_EOBC 0x13
69 #define SONIC_URRA 0x14
70 #define SONIC_RSA 0x15
71 #define SONIC_REA 0x16
72 #define SONIC_RRP 0x17
73 #define SONIC_RWP 0x18
74 #define SONIC_TRBA0 0x19
75 #define SONIC_TRBA1 0x1a
76 #define SONIC_LLFA 0x1f
77 #define SONIC_TTDA 0x20
78 #define SONIC_CEP 0x21
79 #define SONIC_CAP2 0x22
80 #define SONIC_CAP1 0x23
81 #define SONIC_CAP0 0x24
82 #define SONIC_CE 0x25
83 #define SONIC_CDP 0x26
84 #define SONIC_CDC 0x27
85 #define SONIC_SR 0x28
86 #define SONIC_WT0 0x29
87 #define SONIC_WT1 0x2a
88 #define SONIC_RSC 0x2b
89 #define SONIC_CRCT 0x2c
90 #define SONIC_FAET 0x2d
91 #define SONIC_MPT 0x2e
92 #define SONIC_MDT 0x2f
93 #define SONIC_DCR2 0x3f
94
95 #define SONIC_CR_HTX 0x0001
96 #define SONIC_CR_TXP 0x0002
97 #define SONIC_CR_RXDIS 0x0004
98 #define SONIC_CR_RXEN 0x0008
99 #define SONIC_CR_STP 0x0010
100 #define SONIC_CR_ST 0x0020
101 #define SONIC_CR_RST 0x0080
102 #define SONIC_CR_RRRA 0x0100
103 #define SONIC_CR_LCAM 0x0200
104 #define SONIC_CR_MASK 0x03bf
105
106 #define SONIC_DCR_DW 0x0020
107 #define SONIC_DCR_LBR 0x2000
108 #define SONIC_DCR_EXBUS 0x8000
109
110 #define SONIC_RCR_PRX 0x0001
111 #define SONIC_RCR_LBK 0x0002
112 #define SONIC_RCR_FAER 0x0004
113 #define SONIC_RCR_CRCR 0x0008
114 #define SONIC_RCR_CRS 0x0020
115 #define SONIC_RCR_LPKT 0x0040
116 #define SONIC_RCR_BC 0x0080
117 #define SONIC_RCR_MC 0x0100
118 #define SONIC_RCR_LB0 0x0200
119 #define SONIC_RCR_LB1 0x0400
120 #define SONIC_RCR_AMC 0x0800
121 #define SONIC_RCR_PRO 0x1000
122 #define SONIC_RCR_BRD 0x2000
123 #define SONIC_RCR_RNT 0x4000
124
125 #define SONIC_TCR_PTX 0x0001
126 #define SONIC_TCR_BCM 0x0002
127 #define SONIC_TCR_FU 0x0004
128 #define SONIC_TCR_EXC 0x0040
129 #define SONIC_TCR_CRSL 0x0080
130 #define SONIC_TCR_NCRS 0x0100
131 #define SONIC_TCR_EXD 0x0400
132 #define SONIC_TCR_CRCI 0x2000
133 #define SONIC_TCR_PINT 0x8000
134
135 #define SONIC_ISR_RBE 0x0020
136 #define SONIC_ISR_RDE 0x0040
137 #define SONIC_ISR_TC 0x0080
138 #define SONIC_ISR_TXDN 0x0200
139 #define SONIC_ISR_PKTRX 0x0400
140 #define SONIC_ISR_PINT 0x0800
141 #define SONIC_ISR_LCD 0x1000
142
143 #define TYPE_DP8393X "dp8393x"
144 #define DP8393X(obj) OBJECT_CHECK(dp8393xState, (obj), TYPE_DP8393X)
145
146 typedef struct dp8393xState {
147 SysBusDevice parent_obj;
148
149 /* Hardware */
150 uint8_t it_shift;
151 qemu_irq irq;
152 #ifdef DEBUG_SONIC
153 int irq_level;
154 #endif
155 QEMUTimer *watchdog;
156 int64_t wt_last_update;
157 NICConf conf;
158 NICState *nic;
159 MemoryRegion mmio;
160 MemoryRegion prom;
161
162 /* Registers */
163 uint8_t cam[16][6];
164 uint16_t regs[0x40];
165
166 /* Temporaries */
167 uint8_t tx_buffer[0x10000];
168 int loopback_packet;
169
170 /* Memory access */
171 void *dma_mr;
172 AddressSpace as;
173 } dp8393xState;
174
175 static void dp8393x_update_irq(dp8393xState *s)
176 {
177 int level = (s->regs[SONIC_IMR] & s->regs[SONIC_ISR]) ? 1 : 0;
178
179 #ifdef DEBUG_SONIC
180 if (level != s->irq_level) {
181 s->irq_level = level;
182 if (level) {
183 DPRINTF("raise irq, isr is 0x%04x\n", s->regs[SONIC_ISR]);
184 } else {
185 DPRINTF("lower irq\n");
186 }
187 }
188 #endif
189
190 qemu_set_irq(s->irq, level);
191 }
192
193 static void dp8393x_do_load_cam(dp8393xState *s)
194 {
195 uint16_t data[8];
196 int width, size;
197 uint16_t index = 0;
198
199 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
200 size = sizeof(uint16_t) * 4 * width;
201
202 while (s->regs[SONIC_CDC] & 0x1f) {
203 /* Fill current entry */
204 address_space_rw(&s->as,
205 (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP],
206 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
207 s->cam[index][0] = data[1 * width] & 0xff;
208 s->cam[index][1] = data[1 * width] >> 8;
209 s->cam[index][2] = data[2 * width] & 0xff;
210 s->cam[index][3] = data[2 * width] >> 8;
211 s->cam[index][4] = data[3 * width] & 0xff;
212 s->cam[index][5] = data[3 * width] >> 8;
213 DPRINTF("load cam[%d] with %02x%02x%02x%02x%02x%02x\n", index,
214 s->cam[index][0], s->cam[index][1], s->cam[index][2],
215 s->cam[index][3], s->cam[index][4], s->cam[index][5]);
216 /* Move to next entry */
217 s->regs[SONIC_CDC]--;
218 s->regs[SONIC_CDP] += size;
219 index++;
220 }
221
222 /* Read CAM enable */
223 address_space_rw(&s->as,
224 (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_CDP],
225 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
226 s->regs[SONIC_CE] = data[0 * width];
227 DPRINTF("load cam done. cam enable mask 0x%04x\n", s->regs[SONIC_CE]);
228
229 /* Done */
230 s->regs[SONIC_CR] &= ~SONIC_CR_LCAM;
231 s->regs[SONIC_ISR] |= SONIC_ISR_LCD;
232 dp8393x_update_irq(s);
233 }
234
235 static void dp8393x_do_read_rra(dp8393xState *s)
236 {
237 uint16_t data[8];
238 int width, size;
239
240 /* Read memory */
241 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
242 size = sizeof(uint16_t) * 4 * width;
243 address_space_rw(&s->as,
244 (s->regs[SONIC_URRA] << 16) | s->regs[SONIC_RRP],
245 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
246
247 /* Update SONIC registers */
248 s->regs[SONIC_CRBA0] = data[0 * width];
249 s->regs[SONIC_CRBA1] = data[1 * width];
250 s->regs[SONIC_RBWC0] = data[2 * width];
251 s->regs[SONIC_RBWC1] = data[3 * width];
252 DPRINTF("CRBA0/1: 0x%04x/0x%04x, RBWC0/1: 0x%04x/0x%04x\n",
253 s->regs[SONIC_CRBA0], s->regs[SONIC_CRBA1],
254 s->regs[SONIC_RBWC0], s->regs[SONIC_RBWC1]);
255
256 /* Go to next entry */
257 s->regs[SONIC_RRP] += size;
258
259 /* Handle wrap */
260 if (s->regs[SONIC_RRP] == s->regs[SONIC_REA]) {
261 s->regs[SONIC_RRP] = s->regs[SONIC_RSA];
262 }
263
264 /* Check resource exhaustion */
265 if (s->regs[SONIC_RRP] == s->regs[SONIC_RWP])
266 {
267 s->regs[SONIC_ISR] |= SONIC_ISR_RBE;
268 dp8393x_update_irq(s);
269 }
270
271 /* Done */
272 s->regs[SONIC_CR] &= ~SONIC_CR_RRRA;
273 }
274
275 static void dp8393x_do_software_reset(dp8393xState *s)
276 {
277 timer_del(s->watchdog);
278
279 s->regs[SONIC_CR] &= ~(SONIC_CR_LCAM | SONIC_CR_RRRA | SONIC_CR_TXP | SONIC_CR_HTX);
280 s->regs[SONIC_CR] |= SONIC_CR_RST | SONIC_CR_RXDIS;
281 }
282
283 static void dp8393x_set_next_tick(dp8393xState *s)
284 {
285 uint32_t ticks;
286 int64_t delay;
287
288 if (s->regs[SONIC_CR] & SONIC_CR_STP) {
289 timer_del(s->watchdog);
290 return;
291 }
292
293 ticks = s->regs[SONIC_WT1] << 16 | s->regs[SONIC_WT0];
294 s->wt_last_update = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
295 delay = get_ticks_per_sec() * ticks / 5000000;
296 timer_mod(s->watchdog, s->wt_last_update + delay);
297 }
298
299 static void dp8393x_update_wt_regs(dp8393xState *s)
300 {
301 int64_t elapsed;
302 uint32_t val;
303
304 if (s->regs[SONIC_CR] & SONIC_CR_STP) {
305 timer_del(s->watchdog);
306 return;
307 }
308
309 elapsed = s->wt_last_update - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
310 val = s->regs[SONIC_WT1] << 16 | s->regs[SONIC_WT0];
311 val -= elapsed / 5000000;
312 s->regs[SONIC_WT1] = (val >> 16) & 0xffff;
313 s->regs[SONIC_WT0] = (val >> 0) & 0xffff;
314 dp8393x_set_next_tick(s);
315
316 }
317
318 static void dp8393x_do_start_timer(dp8393xState *s)
319 {
320 s->regs[SONIC_CR] &= ~SONIC_CR_STP;
321 dp8393x_set_next_tick(s);
322 }
323
324 static void dp8393x_do_stop_timer(dp8393xState *s)
325 {
326 s->regs[SONIC_CR] &= ~SONIC_CR_ST;
327 dp8393x_update_wt_regs(s);
328 }
329
330 static int dp8393x_can_receive(NetClientState *nc);
331
332 static void dp8393x_do_receiver_enable(dp8393xState *s)
333 {
334 s->regs[SONIC_CR] &= ~SONIC_CR_RXDIS;
335 if (dp8393x_can_receive(s->nic->ncs)) {
336 qemu_flush_queued_packets(qemu_get_queue(s->nic));
337 }
338 }
339
340 static void dp8393x_do_receiver_disable(dp8393xState *s)
341 {
342 s->regs[SONIC_CR] &= ~SONIC_CR_RXEN;
343 }
344
345 static void dp8393x_do_transmit_packets(dp8393xState *s)
346 {
347 NetClientState *nc = qemu_get_queue(s->nic);
348 uint16_t data[12];
349 int width, size;
350 int tx_len, len;
351 uint16_t i;
352
353 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
354
355 while (1) {
356 /* Read memory */
357 DPRINTF("Transmit packet at %08x\n",
358 (s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_CTDA]);
359 size = sizeof(uint16_t) * 6 * width;
360 s->regs[SONIC_TTDA] = s->regs[SONIC_CTDA];
361 address_space_rw(&s->as,
362 ((s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA]) + sizeof(uint16_t) * width,
363 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
364 tx_len = 0;
365
366 /* Update registers */
367 s->regs[SONIC_TCR] = data[0 * width] & 0xf000;
368 s->regs[SONIC_TPS] = data[1 * width];
369 s->regs[SONIC_TFC] = data[2 * width];
370 s->regs[SONIC_TSA0] = data[3 * width];
371 s->regs[SONIC_TSA1] = data[4 * width];
372 s->regs[SONIC_TFS] = data[5 * width];
373
374 /* Handle programmable interrupt */
375 if (s->regs[SONIC_TCR] & SONIC_TCR_PINT) {
376 s->regs[SONIC_ISR] |= SONIC_ISR_PINT;
377 } else {
378 s->regs[SONIC_ISR] &= ~SONIC_ISR_PINT;
379 }
380
381 for (i = 0; i < s->regs[SONIC_TFC]; ) {
382 /* Append fragment */
383 len = s->regs[SONIC_TFS];
384 if (tx_len + len > sizeof(s->tx_buffer)) {
385 len = sizeof(s->tx_buffer) - tx_len;
386 }
387 address_space_rw(&s->as,
388 (s->regs[SONIC_TSA1] << 16) | s->regs[SONIC_TSA0],
389 MEMTXATTRS_UNSPECIFIED, &s->tx_buffer[tx_len], len, 0);
390 tx_len += len;
391
392 i++;
393 if (i != s->regs[SONIC_TFC]) {
394 /* Read next fragment details */
395 size = sizeof(uint16_t) * 3 * width;
396 address_space_rw(&s->as,
397 ((s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA]) + sizeof(uint16_t) * (4 + 3 * i) * width,
398 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
399 s->regs[SONIC_TSA0] = data[0 * width];
400 s->regs[SONIC_TSA1] = data[1 * width];
401 s->regs[SONIC_TFS] = data[2 * width];
402 }
403 }
404
405 /* Handle Ethernet checksum */
406 if (!(s->regs[SONIC_TCR] & SONIC_TCR_CRCI)) {
407 /* Don't append FCS there, to look like slirp packets
408 * which don't have one */
409 } else {
410 /* Remove existing FCS */
411 tx_len -= 4;
412 }
413
414 if (s->regs[SONIC_RCR] & (SONIC_RCR_LB1 | SONIC_RCR_LB0)) {
415 /* Loopback */
416 s->regs[SONIC_TCR] |= SONIC_TCR_CRSL;
417 if (nc->info->can_receive(nc)) {
418 s->loopback_packet = 1;
419 nc->info->receive(nc, s->tx_buffer, tx_len);
420 }
421 } else {
422 /* Transmit packet */
423 qemu_send_packet(nc, s->tx_buffer, tx_len);
424 }
425 s->regs[SONIC_TCR] |= SONIC_TCR_PTX;
426
427 /* Write status */
428 data[0 * width] = s->regs[SONIC_TCR] & 0x0fff; /* status */
429 size = sizeof(uint16_t) * width;
430 address_space_rw(&s->as,
431 (s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA],
432 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 1);
433
434 if (!(s->regs[SONIC_CR] & SONIC_CR_HTX)) {
435 /* Read footer of packet */
436 size = sizeof(uint16_t) * width;
437 address_space_rw(&s->as,
438 ((s->regs[SONIC_UTDA] << 16) | s->regs[SONIC_TTDA]) + sizeof(uint16_t) * (4 + 3 * s->regs[SONIC_TFC]) * width,
439 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
440 s->regs[SONIC_CTDA] = data[0 * width] & ~0x1;
441 if (data[0 * width] & 0x1) {
442 /* EOL detected */
443 break;
444 }
445 }
446 }
447
448 /* Done */
449 s->regs[SONIC_CR] &= ~SONIC_CR_TXP;
450 s->regs[SONIC_ISR] |= SONIC_ISR_TXDN;
451 dp8393x_update_irq(s);
452 }
453
454 static void dp8393x_do_halt_transmission(dp8393xState *s)
455 {
456 /* Nothing to do */
457 }
458
459 static void dp8393x_do_command(dp8393xState *s, uint16_t command)
460 {
461 if ((s->regs[SONIC_CR] & SONIC_CR_RST) && !(command & SONIC_CR_RST)) {
462 s->regs[SONIC_CR] &= ~SONIC_CR_RST;
463 return;
464 }
465
466 s->regs[SONIC_CR] |= (command & SONIC_CR_MASK);
467
468 if (command & SONIC_CR_HTX)
469 dp8393x_do_halt_transmission(s);
470 if (command & SONIC_CR_TXP)
471 dp8393x_do_transmit_packets(s);
472 if (command & SONIC_CR_RXDIS)
473 dp8393x_do_receiver_disable(s);
474 if (command & SONIC_CR_RXEN)
475 dp8393x_do_receiver_enable(s);
476 if (command & SONIC_CR_STP)
477 dp8393x_do_stop_timer(s);
478 if (command & SONIC_CR_ST)
479 dp8393x_do_start_timer(s);
480 if (command & SONIC_CR_RST)
481 dp8393x_do_software_reset(s);
482 if (command & SONIC_CR_RRRA)
483 dp8393x_do_read_rra(s);
484 if (command & SONIC_CR_LCAM)
485 dp8393x_do_load_cam(s);
486 }
487
488 static uint64_t dp8393x_read(void *opaque, hwaddr addr, unsigned int size)
489 {
490 dp8393xState *s = opaque;
491 int reg = addr >> s->it_shift;
492 uint16_t val = 0;
493
494 switch (reg) {
495 /* Update data before reading it */
496 case SONIC_WT0:
497 case SONIC_WT1:
498 dp8393x_update_wt_regs(s);
499 val = s->regs[reg];
500 break;
501 /* Accept read to some registers only when in reset mode */
502 case SONIC_CAP2:
503 case SONIC_CAP1:
504 case SONIC_CAP0:
505 if (s->regs[SONIC_CR] & SONIC_CR_RST) {
506 val = s->cam[s->regs[SONIC_CEP] & 0xf][2* (SONIC_CAP0 - reg) + 1] << 8;
507 val |= s->cam[s->regs[SONIC_CEP] & 0xf][2* (SONIC_CAP0 - reg)];
508 }
509 break;
510 /* All other registers have no special contrainst */
511 default:
512 val = s->regs[reg];
513 }
514
515 DPRINTF("read 0x%04x from reg %s\n", val, reg_names[reg]);
516
517 return val;
518 }
519
520 static void dp8393x_write(void *opaque, hwaddr addr, uint64_t data,
521 unsigned int size)
522 {
523 dp8393xState *s = opaque;
524 int reg = addr >> s->it_shift;
525
526 DPRINTF("write 0x%04x to reg %s\n", (uint16_t)data, reg_names[reg]);
527
528 switch (reg) {
529 /* Command register */
530 case SONIC_CR:
531 dp8393x_do_command(s, data);
532 break;
533 /* Prevent write to read-only registers */
534 case SONIC_CAP2:
535 case SONIC_CAP1:
536 case SONIC_CAP0:
537 case SONIC_SR:
538 case SONIC_MDT:
539 DPRINTF("writing to reg %d invalid\n", reg);
540 break;
541 /* Accept write to some registers only when in reset mode */
542 case SONIC_DCR:
543 if (s->regs[SONIC_CR] & SONIC_CR_RST) {
544 s->regs[reg] = data & 0xbfff;
545 } else {
546 DPRINTF("writing to DCR invalid\n");
547 }
548 break;
549 case SONIC_DCR2:
550 if (s->regs[SONIC_CR] & SONIC_CR_RST) {
551 s->regs[reg] = data & 0xf017;
552 } else {
553 DPRINTF("writing to DCR2 invalid\n");
554 }
555 break;
556 /* 12 lower bytes are Read Only */
557 case SONIC_TCR:
558 s->regs[reg] = data & 0xf000;
559 break;
560 /* 9 lower bytes are Read Only */
561 case SONIC_RCR:
562 s->regs[reg] = data & 0xffe0;
563 break;
564 /* Ignore most significant bit */
565 case SONIC_IMR:
566 s->regs[reg] = data & 0x7fff;
567 dp8393x_update_irq(s);
568 break;
569 /* Clear bits by writing 1 to them */
570 case SONIC_ISR:
571 data &= s->regs[reg];
572 s->regs[reg] &= ~data;
573 if (data & SONIC_ISR_RBE) {
574 dp8393x_do_read_rra(s);
575 }
576 dp8393x_update_irq(s);
577 if (dp8393x_can_receive(s->nic->ncs)) {
578 qemu_flush_queued_packets(qemu_get_queue(s->nic));
579 }
580 break;
581 /* Ignore least significant bit */
582 case SONIC_RSA:
583 case SONIC_REA:
584 case SONIC_RRP:
585 case SONIC_RWP:
586 s->regs[reg] = data & 0xfffe;
587 break;
588 /* Invert written value for some registers */
589 case SONIC_CRCT:
590 case SONIC_FAET:
591 case SONIC_MPT:
592 s->regs[reg] = data ^ 0xffff;
593 break;
594 /* All other registers have no special contrainst */
595 default:
596 s->regs[reg] = data;
597 }
598
599 if (reg == SONIC_WT0 || reg == SONIC_WT1) {
600 dp8393x_set_next_tick(s);
601 }
602 }
603
604 static const MemoryRegionOps dp8393x_ops = {
605 .read = dp8393x_read,
606 .write = dp8393x_write,
607 .impl.min_access_size = 2,
608 .impl.max_access_size = 2,
609 .endianness = DEVICE_NATIVE_ENDIAN,
610 };
611
612 static void dp8393x_watchdog(void *opaque)
613 {
614 dp8393xState *s = opaque;
615
616 if (s->regs[SONIC_CR] & SONIC_CR_STP) {
617 return;
618 }
619
620 s->regs[SONIC_WT1] = 0xffff;
621 s->regs[SONIC_WT0] = 0xffff;
622 dp8393x_set_next_tick(s);
623
624 /* Signal underflow */
625 s->regs[SONIC_ISR] |= SONIC_ISR_TC;
626 dp8393x_update_irq(s);
627 }
628
629 static int dp8393x_can_receive(NetClientState *nc)
630 {
631 dp8393xState *s = qemu_get_nic_opaque(nc);
632
633 if (!(s->regs[SONIC_CR] & SONIC_CR_RXEN))
634 return 0;
635 if (s->regs[SONIC_ISR] & SONIC_ISR_RBE)
636 return 0;
637 return 1;
638 }
639
640 static int dp8393x_receive_filter(dp8393xState *s, const uint8_t * buf,
641 int size)
642 {
643 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
644 int i;
645
646 /* Check promiscuous mode */
647 if ((s->regs[SONIC_RCR] & SONIC_RCR_PRO) && (buf[0] & 1) == 0) {
648 return 0;
649 }
650
651 /* Check multicast packets */
652 if ((s->regs[SONIC_RCR] & SONIC_RCR_AMC) && (buf[0] & 1) == 1) {
653 return SONIC_RCR_MC;
654 }
655
656 /* Check broadcast */
657 if ((s->regs[SONIC_RCR] & SONIC_RCR_BRD) && !memcmp(buf, bcast, sizeof(bcast))) {
658 return SONIC_RCR_BC;
659 }
660
661 /* Check CAM */
662 for (i = 0; i < 16; i++) {
663 if (s->regs[SONIC_CE] & (1 << i)) {
664 /* Entry enabled */
665 if (!memcmp(buf, s->cam[i], sizeof(s->cam[i]))) {
666 return 0;
667 }
668 }
669 }
670
671 return -1;
672 }
673
674 static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
675 size_t size)
676 {
677 dp8393xState *s = qemu_get_nic_opaque(nc);
678 uint16_t data[10];
679 int packet_type;
680 uint32_t available, address;
681 int width, rx_len = size;
682 uint32_t checksum;
683
684 width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;
685
686 s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER |
687 SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC);
688
689 packet_type = dp8393x_receive_filter(s, buf, size);
690 if (packet_type < 0) {
691 DPRINTF("packet not for netcard\n");
692 return -1;
693 }
694
695 /* XXX: Check byte ordering */
696
697 /* Check for EOL */
698 if (s->regs[SONIC_LLFA] & 0x1) {
699 /* Are we still in resource exhaustion? */
700 size = sizeof(uint16_t) * 1 * width;
701 address = ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width;
702 address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED,
703 (uint8_t *)data, size, 0);
704 if (data[0 * width] & 0x1) {
705 /* Still EOL ; stop reception */
706 return -1;
707 } else {
708 s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
709 }
710 }
711
712 /* Save current position */
713 s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1];
714 s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0];
715
716 /* Calculate the ethernet checksum */
717 checksum = cpu_to_le32(crc32(0, buf, rx_len));
718
719 /* Put packet into RBA */
720 DPRINTF("Receive packet at %08x\n", (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0]);
721 address = (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0];
722 address_space_rw(&s->as, address,
723 MEMTXATTRS_UNSPECIFIED, (uint8_t *)buf, rx_len, 1);
724 address += rx_len;
725 address_space_rw(&s->as, address,
726 MEMTXATTRS_UNSPECIFIED, (uint8_t *)&checksum, 4, 1);
727 rx_len += 4;
728 s->regs[SONIC_CRBA1] = address >> 16;
729 s->regs[SONIC_CRBA0] = address & 0xffff;
730 available = (s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0];
731 available -= rx_len / 2;
732 s->regs[SONIC_RBWC1] = available >> 16;
733 s->regs[SONIC_RBWC0] = available & 0xffff;
734
735 /* Update status */
736 if (((s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0]) < s->regs[SONIC_EOBC]) {
737 s->regs[SONIC_RCR] |= SONIC_RCR_LPKT;
738 }
739 s->regs[SONIC_RCR] |= packet_type;
740 s->regs[SONIC_RCR] |= SONIC_RCR_PRX;
741 if (s->loopback_packet) {
742 s->regs[SONIC_RCR] |= SONIC_RCR_LBK;
743 s->loopback_packet = 0;
744 }
745
746 /* Write status to memory */
747 DPRINTF("Write status at %08x\n", (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]);
748 data[0 * width] = s->regs[SONIC_RCR]; /* status */
749 data[1 * width] = rx_len; /* byte count */
750 data[2 * width] = s->regs[SONIC_TRBA0]; /* pkt_ptr0 */
751 data[3 * width] = s->regs[SONIC_TRBA1]; /* pkt_ptr1 */
752 data[4 * width] = s->regs[SONIC_RSC]; /* seq_no */
753 size = sizeof(uint16_t) * 5 * width;
754 address_space_rw(&s->as, (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA],
755 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 1);
756
757 /* Move to next descriptor */
758 size = sizeof(uint16_t) * width;
759 address_space_rw(&s->as,
760 ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width,
761 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, size, 0);
762 s->regs[SONIC_LLFA] = data[0 * width];
763 if (s->regs[SONIC_LLFA] & 0x1) {
764 /* EOL detected */
765 s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
766 } else {
767 data[0 * width] = 0; /* in_use */
768 address_space_rw(&s->as,
769 ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 6 * width,
770 MEMTXATTRS_UNSPECIFIED, (uint8_t *)data, sizeof(uint16_t), 1);
771 s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
772 s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
773 s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);
774
775 if (s->regs[SONIC_RCR] & SONIC_RCR_LPKT) {
776 /* Read next RRA */
777 dp8393x_do_read_rra(s);
778 }
779 }
780
781 /* Done */
782 dp8393x_update_irq(s);
783
784 return size;
785 }
786
787 static void dp8393x_reset(DeviceState *dev)
788 {
789 dp8393xState *s = DP8393X(dev);
790 timer_del(s->watchdog);
791
792 memset(s->regs, 0, sizeof(s->regs));
793 s->regs[SONIC_CR] = SONIC_CR_RST | SONIC_CR_STP | SONIC_CR_RXDIS;
794 s->regs[SONIC_DCR] &= ~(SONIC_DCR_EXBUS | SONIC_DCR_LBR);
795 s->regs[SONIC_RCR] &= ~(SONIC_RCR_LB0 | SONIC_RCR_LB1 | SONIC_RCR_BRD | SONIC_RCR_RNT);
796 s->regs[SONIC_TCR] |= SONIC_TCR_NCRS | SONIC_TCR_PTX;
797 s->regs[SONIC_TCR] &= ~SONIC_TCR_BCM;
798 s->regs[SONIC_IMR] = 0;
799 s->regs[SONIC_ISR] = 0;
800 s->regs[SONIC_DCR2] = 0;
801 s->regs[SONIC_EOBC] = 0x02F8;
802 s->regs[SONIC_RSC] = 0;
803 s->regs[SONIC_CE] = 0;
804 s->regs[SONIC_RSC] = 0;
805
806 /* Network cable is connected */
807 s->regs[SONIC_RCR] |= SONIC_RCR_CRS;
808
809 dp8393x_update_irq(s);
810 }
811
812 static NetClientInfo net_dp83932_info = {
813 .type = NET_CLIENT_OPTIONS_KIND_NIC,
814 .size = sizeof(NICState),
815 .can_receive = dp8393x_can_receive,
816 .receive = dp8393x_receive,
817 };
818
819 static void dp8393x_instance_init(Object *obj)
820 {
821 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
822 dp8393xState *s = DP8393X(obj);
823
824 sysbus_init_mmio(sbd, &s->mmio);
825 sysbus_init_mmio(sbd, &s->prom);
826 sysbus_init_irq(sbd, &s->irq);
827 }
828
829 static void dp8393x_realize(DeviceState *dev, Error **errp)
830 {
831 dp8393xState *s = DP8393X(dev);
832 int i, checksum;
833 uint8_t *prom;
834 Error *local_err = NULL;
835
836 address_space_init(&s->as, s->dma_mr, "dp8393x");
837 memory_region_init_io(&s->mmio, OBJECT(dev), &dp8393x_ops, s,
838 "dp8393x-regs", 0x40 << s->it_shift);
839
840 s->nic = qemu_new_nic(&net_dp83932_info, &s->conf,
841 object_get_typename(OBJECT(dev)), dev->id, s);
842 qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
843
844 s->watchdog = timer_new_ns(QEMU_CLOCK_VIRTUAL, dp8393x_watchdog, s);
845 s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux */
846
847 memory_region_init_ram(&s->prom, OBJECT(dev),
848 "dp8393x-prom", SONIC_PROM_SIZE, &local_err);
849 if (local_err) {
850 error_propagate(errp, local_err);
851 return;
852 }
853 memory_region_set_readonly(&s->prom, true);
854 prom = memory_region_get_ram_ptr(&s->prom);
855 checksum = 0;
856 for (i = 0; i < 6; i++) {
857 prom[i] = s->conf.macaddr.a[i];
858 checksum += prom[i];
859 if (checksum > 0xff) {
860 checksum = (checksum + 1) & 0xff;
861 }
862 }
863 prom[7] = 0xff - checksum;
864 }
865
866 static const VMStateDescription vmstate_dp8393x = {
867 .name = "dp8393x",
868 .version_id = 0,
869 .minimum_version_id = 0,
870 .fields = (VMStateField []) {
871 VMSTATE_BUFFER_UNSAFE(cam, dp8393xState, 0, 16 * 6),
872 VMSTATE_UINT16_ARRAY(regs, dp8393xState, 0x40),
873 VMSTATE_END_OF_LIST()
874 }
875 };
876
877 static Property dp8393x_properties[] = {
878 DEFINE_NIC_PROPERTIES(dp8393xState, conf),
879 DEFINE_PROP_PTR("dma_mr", dp8393xState, dma_mr),
880 DEFINE_PROP_UINT8("it_shift", dp8393xState, it_shift, 0),
881 DEFINE_PROP_END_OF_LIST(),
882 };
883
884 static void dp8393x_class_init(ObjectClass *klass, void *data)
885 {
886 DeviceClass *dc = DEVICE_CLASS(klass);
887
888 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
889 dc->realize = dp8393x_realize;
890 dc->reset = dp8393x_reset;
891 dc->vmsd = &vmstate_dp8393x;
892 dc->props = dp8393x_properties;
893 /* Reason: dma_mr property can't be set */
894 dc->cannot_instantiate_with_device_add_yet = true;
895 }
896
897 static const TypeInfo dp8393x_info = {
898 .name = TYPE_DP8393X,
899 .parent = TYPE_SYS_BUS_DEVICE,
900 .instance_size = sizeof(dp8393xState),
901 .instance_init = dp8393x_instance_init,
902 .class_init = dp8393x_class_init,
903 };
904
905 static void dp8393x_register_types(void)
906 {
907 type_register_static(&dp8393x_info);
908 }
909
910 type_init(dp8393x_register_types)
AR7 emulation for QEMU