lance.c revision 1.40
1 /* $NetBSD: lance.c,v 1.40 2008/04/04 12:25:07 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace 9 * Simulation Facility, NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /*- 41 * Copyright (c) 1992, 1993 42 * The Regents of the University of California. All rights reserved. 43 * 44 * This code is derived from software contributed to Berkeley by 45 * Ralph Campbell and Rick Macklem. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)if_le.c 8.2 (Berkeley) 11/16/93 72 */ 73 74 #include <sys/cdefs.h> 75 __KERNEL_RCSID(0, "$NetBSD: lance.c,v 1.40 2008/04/04 12:25:07 tsutsui Exp $"); 76 77 #include "bpfilter.h" 78 #include "rnd.h" 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/mbuf.h> 83 #include <sys/syslog.h> 84 #include <sys/socket.h> 85 #include <sys/device.h> 86 #include <sys/malloc.h> 87 #include <sys/ioctl.h> 88 #include <sys/errno.h> 89 #if NRND > 0 90 #include <sys/rnd.h> 91 #endif 92 93 #include <net/if.h> 94 #include <net/if_dl.h> 95 #include <net/if_ether.h> 96 #include <net/if_media.h> 97 98 99 #if NBPFILTER > 0 100 #include <net/bpf.h> 101 #include <net/bpfdesc.h> 102 #endif 103 104 #include <dev/ic/lancereg.h> 105 #include <dev/ic/lancevar.h> 106 107 #if defined(_KERNEL_OPT) 108 #include "opt_ddb.h" 109 #endif 110 111 #ifdef DDB 112 #define integrate 113 #define hide 114 #else 115 #define integrate static inline 116 #define hide static 117 #endif 118 119 integrate struct mbuf *lance_get(struct lance_softc *, int, int); 120 121 hide void lance_shutdown(void *); 122 123 int lance_mediachange(struct ifnet *); 124 void lance_mediastatus(struct ifnet *, struct ifmediareq *); 125 126 static inline u_int16_t ether_cmp(void *, void *); 127 128 void lance_stop(struct ifnet *, int); 129 int lance_ioctl(struct ifnet *, u_long, void *); 130 void lance_watchdog(struct ifnet *); 131 132 /* 133 * Compare two Ether/802 addresses for equality, inlined and 134 * unrolled for speed. Use this like memcmp(). 135 * 136 * XXX: Add <machine/inlines.h> for stuff like this? 137 * XXX: or maybe add it to libkern.h instead? 138 * 139 * "I'd love to have an inline assembler version of this." 140 * XXX: Who wanted that? mycroft? I wrote one, but this 141 * version in C is as good as hand-coded assembly. -gwr 142 * 143 * Please do NOT tweak this without looking at the actual 144 * assembly code generated before and after your tweaks! 145 */ 146 static inline uint16_t 147 ether_cmp(void *one, void *two) 148 { 149 uint16_t *a = (uint16_t *)one; 150 uint16_t *b = (uint16_t *)two; 151 uint16_t diff; 152 153 #ifdef m68k 154 /* 155 * The post-increment-pointer form produces the best 156 * machine code for m68k. This was carefully tuned 157 * so it compiles to just 8 short (2-byte) op-codes! 158 */ 159 diff = *a++ - *b++; 160 diff |= *a++ - *b++; 161 diff |= *a++ - *b++; 162 #else 163 /* 164 * Most modern CPUs do better with a single expresion. 165 * Note that short-cut evaluation is NOT helpful here, 166 * because it just makes the code longer, not faster! 167 */ 168 diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]); 169 #endif 170 171 return (diff); 172 } 173 174 #define ETHER_CMP ether_cmp 175 176 #ifdef LANCE_REVC_BUG 177 /* Make sure this is short-aligned, for ether_cmp(). */ 178 static uint16_t bcast_enaddr[3] = { ~0, ~0, ~0 }; 179 #endif 180 181 void 182 lance_config(struct lance_softc *sc) 183 { 184 int i, nbuf; 185 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 186 187 /* Initialize ifnet structure. */ 188 strcpy(ifp->if_xname, device_xname(sc->sc_dev)); 189 ifp->if_softc = sc; 190 ifp->if_start = sc->sc_start; 191 ifp->if_ioctl = lance_ioctl; 192 ifp->if_watchdog = lance_watchdog; 193 ifp->if_init = lance_init; 194 ifp->if_stop = lance_stop; 195 ifp->if_flags = 196 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 197 #ifdef LANCE_REVC_BUG 198 ifp->if_flags &= ~IFF_MULTICAST; 199 #endif 200 IFQ_SET_READY(&ifp->if_snd); 201 202 /* Initialize ifmedia structures. */ 203 ifmedia_init(&sc->sc_media, 0, lance_mediachange, lance_mediastatus); 204 if (sc->sc_supmedia != NULL) { 205 for (i = 0; i < sc->sc_nsupmedia; i++) 206 ifmedia_add(&sc->sc_media, sc->sc_supmedia[i], 207 0, NULL); 208 ifmedia_set(&sc->sc_media, sc->sc_defaultmedia); 209 } else { 210 ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL); 211 ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL); 212 } 213 214 switch (sc->sc_memsize) { 215 case 8192: 216 sc->sc_nrbuf = 4; 217 sc->sc_ntbuf = 1; 218 break; 219 case 16384: 220 sc->sc_nrbuf = 8; 221 sc->sc_ntbuf = 2; 222 break; 223 case 32768: 224 sc->sc_nrbuf = 16; 225 sc->sc_ntbuf = 4; 226 break; 227 case 65536: 228 sc->sc_nrbuf = 32; 229 sc->sc_ntbuf = 8; 230 break; 231 case 131072: 232 sc->sc_nrbuf = 64; 233 sc->sc_ntbuf = 16; 234 break; 235 case 262144: 236 sc->sc_nrbuf = 128; 237 sc->sc_ntbuf = 32; 238 break; 239 default: 240 /* weird memory size; cope with it */ 241 nbuf = sc->sc_memsize / LEBLEN; 242 sc->sc_ntbuf = nbuf / 5; 243 sc->sc_nrbuf = nbuf - sc->sc_ntbuf; 244 } 245 246 aprint_normal(": address %s\n", ether_sprintf(sc->sc_enaddr)); 247 aprint_normal_dev(sc->sc_dev, 248 "%d receive buffers, %d transmit buffers\n", 249 sc->sc_nrbuf, sc->sc_ntbuf); 250 251 /* Make sure the chip is stopped. */ 252 lance_stop(ifp, 0); 253 254 /* claim 802.1q capability */ 255 sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; 256 /* Attach the interface. */ 257 if_attach(ifp); 258 ether_ifattach(ifp, sc->sc_enaddr); 259 260 sc->sc_sh = shutdownhook_establish(lance_shutdown, ifp); 261 if (sc->sc_sh == NULL) 262 panic("lance_config: can't establish shutdownhook"); 263 sc->sc_rbufaddr = malloc(sc->sc_nrbuf * sizeof(int), M_DEVBUF, 264 M_WAITOK); 265 sc->sc_tbufaddr = malloc(sc->sc_ntbuf * sizeof(int), M_DEVBUF, 266 M_WAITOK); 267 268 #if NRND > 0 269 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), 270 RND_TYPE_NET, 0); 271 #endif 272 } 273 274 void 275 lance_reset(struct lance_softc *sc) 276 { 277 int s; 278 279 s = splnet(); 280 lance_init(&sc->sc_ethercom.ec_if); 281 splx(s); 282 } 283 284 void 285 lance_stop(struct ifnet *ifp, int disable) 286 { 287 struct lance_softc *sc = ifp->if_softc; 288 289 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 290 } 291 292 /* 293 * Initialization of interface; set up initialization block 294 * and transmit/receive descriptor rings. 295 */ 296 int 297 lance_init(struct ifnet *ifp) 298 { 299 struct lance_softc *sc = ifp->if_softc; 300 int timo; 301 u_long a; 302 303 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 304 DELAY(100); 305 306 /* Newer LANCE chips have a reset register */ 307 if (sc->sc_hwreset) 308 (*sc->sc_hwreset)(sc); 309 310 /* Set the correct byte swapping mode, etc. */ 311 (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3); 312 313 /* Set up LANCE init block. */ 314 (*sc->sc_meminit)(sc); 315 316 /* Give LANCE the physical address of its init block. */ 317 a = sc->sc_addr + LE_INITADDR(sc); 318 (*sc->sc_wrcsr)(sc, LE_CSR1, a); 319 (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16); 320 321 /* Try to initialize the LANCE. */ 322 DELAY(100); 323 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT); 324 325 /* Wait for initialization to finish. */ 326 for (timo = 100000; timo; timo--) 327 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) 328 break; 329 330 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) { 331 /* Start the LANCE. */ 332 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT); 333 ifp->if_flags |= IFF_RUNNING; 334 ifp->if_flags &= ~IFF_OACTIVE; 335 ifp->if_timer = 0; 336 (*sc->sc_start)(ifp); 337 } else 338 printf("%s: controller failed to initialize\n", 339 device_xname(sc->sc_dev)); 340 if (sc->sc_hwinit) 341 (*sc->sc_hwinit)(sc); 342 343 return (0); 344 } 345 346 /* 347 * Routine to copy from mbuf chain to transmit buffer in 348 * network buffer memory. 349 */ 350 int 351 lance_put(struct lance_softc *sc, int boff, struct mbuf *m) 352 { 353 struct mbuf *n; 354 int len, tlen = 0; 355 356 for (; m; m = n) { 357 len = m->m_len; 358 if (len == 0) { 359 MFREE(m, n); 360 continue; 361 } 362 (*sc->sc_copytobuf)(sc, mtod(m, void *), boff, len); 363 boff += len; 364 tlen += len; 365 MFREE(m, n); 366 } 367 if (tlen < LEMINSIZE) { 368 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen); 369 tlen = LEMINSIZE; 370 } 371 return (tlen); 372 } 373 374 /* 375 * Pull data off an interface. 376 * Len is length of data, with local net header stripped. 377 * We copy the data into mbufs. When full cluster sized units are present 378 * we copy into clusters. 379 */ 380 integrate struct mbuf * 381 lance_get(struct lance_softc *sc, int boff, int totlen) 382 { 383 struct mbuf *m, *m0, *newm; 384 int len; 385 386 MGETHDR(m0, M_DONTWAIT, MT_DATA); 387 if (m0 == 0) 388 return (0); 389 m0->m_pkthdr.rcvif = &sc->sc_ethercom.ec_if; 390 m0->m_pkthdr.len = totlen; 391 len = MHLEN; 392 m = m0; 393 394 while (totlen > 0) { 395 if (totlen >= MINCLSIZE) { 396 MCLGET(m, M_DONTWAIT); 397 if ((m->m_flags & M_EXT) == 0) 398 goto bad; 399 len = MCLBYTES; 400 } 401 402 if (m == m0) { 403 char *newdata = (char *) 404 ALIGN(m->m_data + sizeof(struct ether_header)) - 405 sizeof(struct ether_header); 406 len -= newdata - m->m_data; 407 m->m_data = newdata; 408 } 409 410 m->m_len = len = min(totlen, len); 411 (*sc->sc_copyfrombuf)(sc, mtod(m, void *), boff, len); 412 boff += len; 413 414 totlen -= len; 415 if (totlen > 0) { 416 MGET(newm, M_DONTWAIT, MT_DATA); 417 if (newm == 0) 418 goto bad; 419 len = MLEN; 420 m = m->m_next = newm; 421 } 422 } 423 424 return (m0); 425 426 bad: 427 m_freem(m0); 428 return (0); 429 } 430 431 /* 432 * Pass a packet to the higher levels. 433 */ 434 void 435 lance_read(struct lance_softc *sc, int boff, int len) 436 { 437 struct mbuf *m; 438 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 439 struct ether_header *eh; 440 441 if (len <= sizeof(struct ether_header) || 442 len > ((sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) ? 443 ETHER_VLAN_ENCAP_LEN + ETHERMTU + sizeof(struct ether_header) : 444 ETHERMTU + sizeof(struct ether_header))) { 445 #ifdef LEDEBUG 446 printf("%s: invalid packet size %d; dropping\n", 447 device_xname(sc->sc_dev), len); 448 #endif 449 ifp->if_ierrors++; 450 return; 451 } 452 453 /* Pull packet off interface. */ 454 m = lance_get(sc, boff, len); 455 if (m == 0) { 456 ifp->if_ierrors++; 457 return; 458 } 459 460 ifp->if_ipackets++; 461 462 eh = mtod(m, struct ether_header *); 463 464 #ifdef LANCE_REVC_BUG 465 /* 466 * The old LANCE (Rev. C) chips have a bug which causes 467 * garbage to be inserted in front of the received packet. 468 * The work-around is to ignore packets with an invalid 469 * destination address (garbage will usually not match). 470 * Of course, this precludes multicast support... 471 */ 472 if (ETHER_CMP(eh->ether_dhost, sc->sc_enaddr) && 473 ETHER_CMP(eh->ether_dhost, bcast_enaddr)) { 474 m_freem(m); 475 return; 476 } 477 #endif 478 479 /* 480 * Some lance device does not present IFF_SIMPLEX behavior on multicast 481 * packets. Make sure to drop it if it is from ourselves. 482 */ 483 if (!ETHER_CMP(eh->ether_shost, sc->sc_enaddr)) { 484 m_freem(m); 485 return; 486 } 487 488 #if NBPFILTER > 0 489 /* 490 * Check if there's a BPF listener on this interface. 491 * If so, hand off the raw packet to BPF. 492 */ 493 if (ifp->if_bpf) 494 bpf_mtap(ifp->if_bpf, m); 495 #endif 496 497 /* Pass the packet up. */ 498 (*ifp->if_input)(ifp, m); 499 } 500 501 #undef ifp 502 503 void 504 lance_watchdog(struct ifnet *ifp) 505 { 506 struct lance_softc *sc = ifp->if_softc; 507 508 log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev)); 509 ++ifp->if_oerrors; 510 511 lance_reset(sc); 512 } 513 514 int 515 lance_mediachange(struct ifnet *ifp) 516 { 517 struct lance_softc *sc = ifp->if_softc; 518 519 if (sc->sc_mediachange) 520 return ((*sc->sc_mediachange)(sc)); 521 return (0); 522 } 523 524 void 525 lance_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr) 526 { 527 struct lance_softc *sc = ifp->if_softc; 528 529 if ((ifp->if_flags & IFF_UP) == 0) 530 return; 531 532 ifmr->ifm_status = IFM_AVALID; 533 if (sc->sc_havecarrier) 534 ifmr->ifm_status |= IFM_ACTIVE; 535 536 if (sc->sc_mediastatus) 537 (*sc->sc_mediastatus)(sc, ifmr); 538 } 539 540 /* 541 * Process an ioctl request. 542 */ 543 int 544 lance_ioctl(struct ifnet *ifp, u_long cmd, void *data) 545 { 546 struct lance_softc *sc = ifp->if_softc; 547 struct ifreq *ifr = (struct ifreq *)data; 548 int s, error = 0; 549 550 s = splnet(); 551 552 switch (cmd) { 553 case SIOCSIFADDR: 554 case SIOCSIFFLAGS: 555 error = ether_ioctl(ifp, cmd, data); 556 break; 557 case SIOCADDMULTI: 558 case SIOCDELMULTI: 559 if ((error = ether_ioctl(ifp, cmd, data)) == ENETRESET) { 560 /* 561 * Multicast list has changed; set the hardware filter 562 * accordingly. 563 */ 564 if (ifp->if_flags & IFF_RUNNING) 565 lance_reset(sc); 566 error = 0; 567 } 568 break; 569 570 case SIOCGIFMEDIA: 571 case SIOCSIFMEDIA: 572 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 573 break; 574 575 default: 576 error = EINVAL; 577 break; 578 } 579 580 splx(s); 581 return (error); 582 } 583 584 hide void 585 lance_shutdown(void *arg) 586 { 587 588 lance_stop((struct ifnet *)arg, 0); 589 } 590 591 /* 592 * Set up the logical address filter. 593 */ 594 void 595 lance_setladrf(struct ethercom *ac, uint16_t *af) 596 { 597 struct ifnet *ifp = &ac->ec_if; 598 struct ether_multi *enm; 599 uint32_t crc; 600 struct ether_multistep step; 601 602 /* 603 * Set up multicast address filter by passing all multicast addresses 604 * through a crc generator, and then using the high order 6 bits as an 605 * index into the 64 bit logical address filter. The high order bit 606 * selects the word, while the rest of the bits select the bit within 607 * the word. 608 */ 609 610 if (ifp->if_flags & IFF_PROMISC) 611 goto allmulti; 612 613 af[0] = af[1] = af[2] = af[3] = 0x0000; 614 ETHER_FIRST_MULTI(step, ac, enm); 615 while (enm != NULL) { 616 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 617 /* 618 * We must listen to a range of multicast addresses. 619 * For now, just accept all multicasts, rather than 620 * trying to set only those filter bits needed to match 621 * the range. (At this time, the only use of address 622 * ranges is for IP multicast routing, for which the 623 * range is big enough to require all bits set.) 624 */ 625 goto allmulti; 626 } 627 628 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN); 629 630 /* Just want the 6 most significant bits. */ 631 crc >>= 26; 632 633 /* Set the corresponding bit in the filter. */ 634 af[crc >> 4] |= 1 << (crc & 0xf); 635 636 ETHER_NEXT_MULTI(step, enm); 637 } 638 ifp->if_flags &= ~IFF_ALLMULTI; 639 return; 640 641 allmulti: 642 ifp->if_flags |= IFF_ALLMULTI; 643 af[0] = af[1] = af[2] = af[3] = 0xffff; 644 } 645 646 /* 647 * Routines for accessing the transmit and receive buffers. 648 * The various CPU and adapter configurations supported by this 649 * driver require three different access methods for buffers 650 * and descriptors: 651 * (1) contig (contiguous data; no padding), 652 * (2) gap2 (two bytes of data followed by two bytes of padding), 653 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 654 */ 655 656 /* 657 * contig: contiguous data with no padding. 658 * 659 * Buffers may have any alignment. 660 */ 661 662 void 663 lance_copytobuf_contig(struct lance_softc *sc, void *from, int boff, int len) 664 { 665 uint8_t *buf = sc->sc_mem; 666 667 /* 668 * Just call memcpy() to do the work. 669 */ 670 memcpy(buf + boff, from, len); 671 } 672 673 void 674 lance_copyfrombuf_contig(struct lance_softc *sc, void *to, int boff, int len) 675 { 676 uint8_t *buf = sc->sc_mem; 677 678 /* 679 * Just call memcpy() to do the work. 680 */ 681 memcpy(to, buf + boff, len); 682 } 683 684 void 685 lance_zerobuf_contig(struct lance_softc *sc, int boff, int len) 686 { 687 uint8_t *buf = sc->sc_mem; 688 689 /* 690 * Just let memset() do the work 691 */ 692 memset(buf + boff, 0, len); 693 } 694 695 #if 0 696 /* 697 * Examples only; duplicate these and tweak (if necessary) in 698 * machine-specific front-ends. 699 */ 700 701 /* 702 * gap2: two bytes of data followed by two bytes of pad. 703 * 704 * Buffers must be 4-byte aligned. The code doesn't worry about 705 * doing an extra byte. 706 */ 707 708 void 709 lance_copytobuf_gap2(struct lance_softc *sc, void *fromv, int boff, int len) 710 { 711 volatile void *buf = sc->sc_mem; 712 void *from = fromv; 713 volatile uint16_t *bptr; 714 715 if (boff & 0x1) { 716 /* handle unaligned first byte */ 717 bptr = ((volatile uint16_t *)buf) + (boff - 1); 718 *bptr = (*from++ << 8) | (*bptr & 0xff); 719 bptr += 2; 720 len--; 721 } else 722 bptr = ((volatile uint16_t *)buf) + boff; 723 while (len > 1) { 724 *bptr = (from[1] << 8) | (from[0] & 0xff); 725 bptr += 2; 726 from += 2; 727 len -= 2; 728 } 729 if (len == 1) 730 *bptr = (uint16_t)*from; 731 } 732 733 void 734 lance_copyfrombuf_gap2(struct lance_softc *sc, void *tov, int boff, int len) 735 { 736 volatile void *buf = sc->sc_mem; 737 void *to = tov; 738 volatile uint16_t *bptr; 739 uint16_t tmp; 740 741 if (boff & 0x1) { 742 /* handle unaligned first byte */ 743 bptr = ((volatile uint16_t *)buf) + (boff - 1); 744 *to++ = (*bptr >> 8) & 0xff; 745 bptr += 2; 746 len--; 747 } else 748 bptr = ((volatile uint16_t *)buf) + boff; 749 while (len > 1) { 750 tmp = *bptr; 751 *to++ = tmp & 0xff; 752 *to++ = (tmp >> 8) & 0xff; 753 bptr += 2; 754 len -= 2; 755 } 756 if (len == 1) 757 *to = *bptr & 0xff; 758 } 759 760 void 761 lance_zerobuf_gap2(struct lance_softc *sc, int boff, int len) 762 { 763 volatile void *buf = sc->sc_mem; 764 volatile uint16_t *bptr; 765 766 if ((unsigned int)boff & 0x1) { 767 bptr = ((volatile uint16_t *)buf) + (boff - 1); 768 *bptr &= 0xff; 769 bptr += 2; 770 len--; 771 } else 772 bptr = ((volatile uint16_t *)buf) + boff; 773 while (len > 0) { 774 *bptr = 0; 775 bptr += 2; 776 len -= 2; 777 } 778 } 779 780 /* 781 * gap16: 16 bytes of data followed by 16 bytes of pad. 782 * 783 * Buffers must be 32-byte aligned. 784 */ 785 786 void 787 lance_copytobuf_gap16(struct lance_softc *sc, void *fromv, int boff, int len) 788 { 789 volatile uint8_t *buf = sc->sc_mem; 790 void *from = fromv; 791 uint8_t *bptr; 792 int xfer; 793 794 bptr = buf + ((boff << 1) & ~0x1f); 795 boff &= 0xf; 796 xfer = min(len, 16 - boff); 797 while (len > 0) { 798 memcpy(bptr + boff, from, xfer); 799 from += xfer; 800 bptr += 32; 801 boff = 0; 802 len -= xfer; 803 xfer = min(len, 16); 804 } 805 } 806 807 void 808 lance_copyfrombuf_gap16(struct lance_softc *sc, void *tov, int boff, int len) 809 { 810 volatile uint8_t *buf = sc->sc_mem; 811 void *to = tov; 812 uint8_t *bptr; 813 int xfer; 814 815 bptr = buf + ((boff << 1) & ~0x1f); 816 boff &= 0xf; 817 xfer = min(len, 16 - boff); 818 while (len > 0) { 819 memcpy(to, bptr + boff, xfer); 820 to += xfer; 821 bptr += 32; 822 boff = 0; 823 len -= xfer; 824 xfer = min(len, 16); 825 } 826 } 827 828 void 829 lance_zerobuf_gap16(struct lance_softc *sc, int boff, int len) 830 { 831 volatile uint8_t *buf = sc->sc_mem; 832 uint8_t *bptr; 833 int xfer; 834 835 bptr = buf + ((boff << 1) & ~0x1f); 836 boff &= 0xf; 837 xfer = min(len, 16 - boff); 838 while (len > 0) { 839 memset(bptr + boff, 0, xfer); 840 bptr += 32; 841 boff = 0; 842 len -= xfer; 843 xfer = min(len, 16); 844 } 845 } 846 #endif /* Example only */ 847
Indexes created Tue Sep 23 02:09:52 GMT 2025