lance.c revision 1.38
1 /* $NetBSD: lance.c,v 1.38 2007/03/04 06:01:57 christos 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 1.38 2007/03/04 06:01:57 christos 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 u_int16_t 147 ether_cmp(one, two) 148 void *one, *two; 149 { 150 u_int16_t *a = (u_short *) one; 151 u_int16_t *b = (u_short *) two; 152 u_int16_t diff; 153 154 #ifdef m68k 155 /* 156 * The post-increment-pointer form produces the best 157 * machine code for m68k. This was carefully tuned 158 * so it compiles to just 8 short (2-byte) op-codes! 159 */ 160 diff = *a++ - *b++; 161 diff |= *a++ - *b++; 162 diff |= *a++ - *b++; 163 #else 164 /* 165 * Most modern CPUs do better with a single expresion. 166 * Note that short-cut evaluation is NOT helpful here, 167 * because it just makes the code longer, not faster! 168 */ 169 diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]); 170 #endif 171 172 return (diff); 173 } 174 175 #define ETHER_CMP ether_cmp 176 177 #ifdef LANCE_REVC_BUG 178 /* Make sure this is short-aligned, for ether_cmp(). */ 179 static u_int16_t bcast_enaddr[3] = { ~0, ~0, ~0 }; 180 #endif 181 182 void 183 lance_config(sc) 184 struct lance_softc *sc; 185 { 186 int i, nbuf; 187 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 188 189 /* Initialize ifnet structure. */ 190 strcpy(ifp->if_xname, sc->sc_dev.dv_xname); 191 ifp->if_softc = sc; 192 ifp->if_start = sc->sc_start; 193 ifp->if_ioctl = lance_ioctl; 194 ifp->if_watchdog = lance_watchdog; 195 ifp->if_init = lance_init; 196 ifp->if_stop = lance_stop; 197 ifp->if_flags = 198 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 199 #ifdef LANCE_REVC_BUG 200 ifp->if_flags &= ~IFF_MULTICAST; 201 #endif 202 IFQ_SET_READY(&ifp->if_snd); 203 204 /* Initialize ifmedia structures. */ 205 ifmedia_init(&sc->sc_media, 0, lance_mediachange, lance_mediastatus); 206 if (sc->sc_supmedia != NULL) { 207 for (i = 0; i < sc->sc_nsupmedia; i++) 208 ifmedia_add(&sc->sc_media, sc->sc_supmedia[i], 209 0, NULL); 210 ifmedia_set(&sc->sc_media, sc->sc_defaultmedia); 211 } else { 212 ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL); 213 ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL); 214 } 215 216 switch (sc->sc_memsize) { 217 case 8192: 218 sc->sc_nrbuf = 4; 219 sc->sc_ntbuf = 1; 220 break; 221 case 16384: 222 sc->sc_nrbuf = 8; 223 sc->sc_ntbuf = 2; 224 break; 225 case 32768: 226 sc->sc_nrbuf = 16; 227 sc->sc_ntbuf = 4; 228 break; 229 case 65536: 230 sc->sc_nrbuf = 32; 231 sc->sc_ntbuf = 8; 232 break; 233 case 131072: 234 sc->sc_nrbuf = 64; 235 sc->sc_ntbuf = 16; 236 break; 237 case 262144: 238 sc->sc_nrbuf = 128; 239 sc->sc_ntbuf = 32; 240 break; 241 default: 242 /* weird memory size; cope with it */ 243 nbuf = sc->sc_memsize / LEBLEN; 244 sc->sc_ntbuf = nbuf / 5; 245 sc->sc_nrbuf = nbuf - sc->sc_ntbuf; 246 } 247 248 printf(": address %s\n", ether_sprintf(sc->sc_enaddr)); 249 printf("%s: %d receive buffers, %d transmit buffers\n", 250 sc->sc_dev.dv_xname, sc->sc_nrbuf, sc->sc_ntbuf); 251 252 /* Make sure the chip is stopped. */ 253 lance_stop(ifp, 0); 254 255 /* claim 802.1q capability */ 256 sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; 257 /* Attach the interface. */ 258 if_attach(ifp); 259 ether_ifattach(ifp, sc->sc_enaddr); 260 261 sc->sc_sh = shutdownhook_establish(lance_shutdown, ifp); 262 if (sc->sc_sh == NULL) 263 panic("lance_config: can't establish shutdownhook"); 264 sc->sc_rbufaddr = malloc(sc->sc_nrbuf * sizeof(int), M_DEVBUF, 265 M_WAITOK); 266 sc->sc_tbufaddr = malloc(sc->sc_ntbuf * sizeof(int), M_DEVBUF, 267 M_WAITOK); 268 269 #if NRND > 0 270 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 271 RND_TYPE_NET, 0); 272 #endif 273 } 274 275 void 276 lance_reset(sc) 277 struct lance_softc *sc; 278 { 279 int s; 280 281 s = splnet(); 282 lance_init(&sc->sc_ethercom.ec_if); 283 splx(s); 284 } 285 286 void 287 lance_stop(struct ifnet *ifp, int disable) 288 { 289 struct lance_softc *sc = ifp->if_softc; 290 291 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 292 } 293 294 /* 295 * Initialization of interface; set up initialization block 296 * and transmit/receive descriptor rings. 297 */ 298 int 299 lance_init(ifp) 300 struct ifnet *ifp; 301 { 302 struct lance_softc *sc = ifp->if_softc; 303 int timo; 304 u_long a; 305 306 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 307 DELAY(100); 308 309 /* Newer LANCE chips have a reset register */ 310 if (sc->sc_hwreset) 311 (*sc->sc_hwreset)(sc); 312 313 /* Set the correct byte swapping mode, etc. */ 314 (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3); 315 316 /* Set up LANCE init block. */ 317 (*sc->sc_meminit)(sc); 318 319 /* Give LANCE the physical address of its init block. */ 320 a = sc->sc_addr + LE_INITADDR(sc); 321 (*sc->sc_wrcsr)(sc, LE_CSR1, a); 322 (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16); 323 324 /* Try to initialize the LANCE. */ 325 DELAY(100); 326 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT); 327 328 /* Wait for initialization to finish. */ 329 for (timo = 100000; timo; timo--) 330 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) 331 break; 332 333 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) { 334 /* Start the LANCE. */ 335 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT); 336 ifp->if_flags |= IFF_RUNNING; 337 ifp->if_flags &= ~IFF_OACTIVE; 338 ifp->if_timer = 0; 339 (*sc->sc_start)(ifp); 340 } else 341 printf("%s: controller failed to initialize\n", 342 sc->sc_dev.dv_xname); 343 if (sc->sc_hwinit) 344 (*sc->sc_hwinit)(sc); 345 346 return (0); 347 } 348 349 /* 350 * Routine to copy from mbuf chain to transmit buffer in 351 * network buffer memory. 352 */ 353 int 354 lance_put(sc, boff, m) 355 struct lance_softc *sc; 356 int boff; 357 struct mbuf *m; 358 { 359 struct mbuf *n; 360 int len, tlen = 0; 361 362 for (; m; m = n) { 363 len = m->m_len; 364 if (len == 0) { 365 MFREE(m, n); 366 continue; 367 } 368 (*sc->sc_copytobuf)(sc, mtod(m, void *), boff, len); 369 boff += len; 370 tlen += len; 371 MFREE(m, n); 372 } 373 if (tlen < LEMINSIZE) { 374 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen); 375 tlen = LEMINSIZE; 376 } 377 return (tlen); 378 } 379 380 /* 381 * Pull data off an interface. 382 * Len is length of data, with local net header stripped. 383 * We copy the data into mbufs. When full cluster sized units are present 384 * we copy into clusters. 385 */ 386 integrate struct mbuf * 387 lance_get(sc, boff, totlen) 388 struct lance_softc *sc; 389 int boff, totlen; 390 { 391 struct mbuf *m, *m0, *newm; 392 int len; 393 394 MGETHDR(m0, M_DONTWAIT, MT_DATA); 395 if (m0 == 0) 396 return (0); 397 m0->m_pkthdr.rcvif = &sc->sc_ethercom.ec_if; 398 m0->m_pkthdr.len = totlen; 399 len = MHLEN; 400 m = m0; 401 402 while (totlen > 0) { 403 if (totlen >= MINCLSIZE) { 404 MCLGET(m, M_DONTWAIT); 405 if ((m->m_flags & M_EXT) == 0) 406 goto bad; 407 len = MCLBYTES; 408 } 409 410 if (m == m0) { 411 char *newdata = (char *) 412 ALIGN(m->m_data + sizeof(struct ether_header)) - 413 sizeof(struct ether_header); 414 len -= newdata - m->m_data; 415 m->m_data = newdata; 416 } 417 418 m->m_len = len = min(totlen, len); 419 (*sc->sc_copyfrombuf)(sc, mtod(m, void *), boff, len); 420 boff += len; 421 422 totlen -= len; 423 if (totlen > 0) { 424 MGET(newm, M_DONTWAIT, MT_DATA); 425 if (newm == 0) 426 goto bad; 427 len = MLEN; 428 m = m->m_next = newm; 429 } 430 } 431 432 return (m0); 433 434 bad: 435 m_freem(m0); 436 return (0); 437 } 438 439 /* 440 * Pass a packet to the higher levels. 441 */ 442 void 443 lance_read(sc, boff, len) 444 struct lance_softc *sc; 445 int boff, len; 446 { 447 struct mbuf *m; 448 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 449 struct ether_header *eh; 450 451 if (len <= sizeof(struct ether_header) || 452 len > ((sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) ? 453 ETHER_VLAN_ENCAP_LEN + ETHERMTU + sizeof(struct ether_header) : 454 ETHERMTU + sizeof(struct ether_header))) { 455 #ifdef LEDEBUG 456 printf("%s: invalid packet size %d; dropping\n", 457 sc->sc_dev.dv_xname, len); 458 #endif 459 ifp->if_ierrors++; 460 return; 461 } 462 463 /* Pull packet off interface. */ 464 m = lance_get(sc, boff, len); 465 if (m == 0) { 466 ifp->if_ierrors++; 467 return; 468 } 469 470 ifp->if_ipackets++; 471 472 eh = mtod(m, struct ether_header *); 473 474 #ifdef LANCE_REVC_BUG 475 /* 476 * The old LANCE (Rev. C) chips have a bug which causes 477 * garbage to be inserted in front of the received packet. 478 * The work-around is to ignore packets with an invalid 479 * destination address (garbage will usually not match). 480 * Of course, this precludes multicast support... 481 */ 482 if (ETHER_CMP(eh->ether_dhost, sc->sc_enaddr) && 483 ETHER_CMP(eh->ether_dhost, bcast_enaddr)) { 484 m_freem(m); 485 return; 486 } 487 #endif 488 489 /* 490 * Some lance device does not present IFF_SIMPLEX behavior on multicast 491 * packets. Make sure to drop it if it is from ourselves. 492 */ 493 if (!ETHER_CMP(eh->ether_shost, sc->sc_enaddr)) { 494 m_freem(m); 495 return; 496 } 497 498 #if NBPFILTER > 0 499 /* 500 * Check if there's a BPF listener on this interface. 501 * If so, hand off the raw packet to BPF. 502 */ 503 if (ifp->if_bpf) 504 bpf_mtap(ifp->if_bpf, m); 505 #endif 506 507 /* Pass the packet up. */ 508 (*ifp->if_input)(ifp, m); 509 } 510 511 #undef ifp 512 513 void 514 lance_watchdog(ifp) 515 struct ifnet *ifp; 516 { 517 struct lance_softc *sc = ifp->if_softc; 518 519 log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname); 520 ++ifp->if_oerrors; 521 522 lance_reset(sc); 523 } 524 525 int 526 lance_mediachange(ifp) 527 struct ifnet *ifp; 528 { 529 struct lance_softc *sc = ifp->if_softc; 530 531 if (sc->sc_mediachange) 532 return ((*sc->sc_mediachange)(sc)); 533 return (0); 534 } 535 536 void 537 lance_mediastatus(ifp, ifmr) 538 struct ifnet *ifp; 539 struct ifmediareq *ifmr; 540 { 541 struct lance_softc *sc = ifp->if_softc; 542 543 if ((ifp->if_flags & IFF_UP) == 0) 544 return; 545 546 ifmr->ifm_status = IFM_AVALID; 547 if (sc->sc_havecarrier) 548 ifmr->ifm_status |= IFM_ACTIVE; 549 550 if (sc->sc_mediastatus) 551 (*sc->sc_mediastatus)(sc, ifmr); 552 } 553 554 /* 555 * Process an ioctl request. 556 */ 557 int 558 lance_ioctl(ifp, cmd, data) 559 struct ifnet *ifp; 560 u_long cmd; 561 void *data; 562 { 563 struct lance_softc *sc = ifp->if_softc; 564 struct ifreq *ifr = (struct ifreq *)data; 565 int s, error = 0; 566 567 s = splnet(); 568 569 switch (cmd) { 570 571 case SIOCSIFADDR: 572 case SIOCSIFFLAGS: 573 error = ether_ioctl(ifp, cmd, data); 574 break; 575 576 577 case SIOCADDMULTI: 578 case SIOCDELMULTI: 579 error = (cmd == SIOCADDMULTI) ? 580 ether_addmulti(ifr, &sc->sc_ethercom) : 581 ether_delmulti(ifr, &sc->sc_ethercom); 582 583 if (error == ENETRESET) { 584 /* 585 * Multicast list has changed; set the hardware filter 586 * accordingly. 587 */ 588 if (ifp->if_flags & IFF_RUNNING) 589 lance_reset(sc); 590 error = 0; 591 } 592 break; 593 594 case SIOCGIFMEDIA: 595 case SIOCSIFMEDIA: 596 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 597 break; 598 599 default: 600 error = EINVAL; 601 break; 602 } 603 604 splx(s); 605 return (error); 606 } 607 608 hide void 609 lance_shutdown(arg) 610 void *arg; 611 { 612 613 lance_stop((struct ifnet *)arg, 0); 614 } 615 616 /* 617 * Set up the logical address filter. 618 */ 619 void 620 lance_setladrf(ac, af) 621 struct ethercom *ac; 622 u_int16_t *af; 623 { 624 struct ifnet *ifp = &ac->ec_if; 625 struct ether_multi *enm; 626 u_int32_t crc; 627 struct ether_multistep step; 628 629 /* 630 * Set up multicast address filter by passing all multicast addresses 631 * through a crc generator, and then using the high order 6 bits as an 632 * index into the 64 bit logical address filter. The high order bit 633 * selects the word, while the rest of the bits select the bit within 634 * the word. 635 */ 636 637 if (ifp->if_flags & IFF_PROMISC) 638 goto allmulti; 639 640 af[0] = af[1] = af[2] = af[3] = 0x0000; 641 ETHER_FIRST_MULTI(step, ac, enm); 642 while (enm != NULL) { 643 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 644 /* 645 * We must listen to a range of multicast addresses. 646 * For now, just accept all multicasts, rather than 647 * trying to set only those filter bits needed to match 648 * the range. (At this time, the only use of address 649 * ranges is for IP multicast routing, for which the 650 * range is big enough to require all bits set.) 651 */ 652 goto allmulti; 653 } 654 655 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN); 656 657 /* Just want the 6 most significant bits. */ 658 crc >>= 26; 659 660 /* Set the corresponding bit in the filter. */ 661 af[crc >> 4] |= 1 << (crc & 0xf); 662 663 ETHER_NEXT_MULTI(step, enm); 664 } 665 ifp->if_flags &= ~IFF_ALLMULTI; 666 return; 667 668 allmulti: 669 ifp->if_flags |= IFF_ALLMULTI; 670 af[0] = af[1] = af[2] = af[3] = 0xffff; 671 } 672 673 /* 674 * Routines for accessing the transmit and receive buffers. 675 * The various CPU and adapter configurations supported by this 676 * driver require three different access methods for buffers 677 * and descriptors: 678 * (1) contig (contiguous data; no padding), 679 * (2) gap2 (two bytes of data followed by two bytes of padding), 680 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 681 */ 682 683 /* 684 * contig: contiguous data with no padding. 685 * 686 * Buffers may have any alignment. 687 */ 688 689 void 690 lance_copytobuf_contig(sc, from, boff, len) 691 struct lance_softc *sc; 692 void *from; 693 int boff, len; 694 { 695 char *buf = sc->sc_mem; 696 697 /* 698 * Just call memcpy() to do the work. 699 */ 700 memcpy(buf + boff, from, len); 701 } 702 703 void 704 lance_copyfrombuf_contig(sc, to, boff, len) 705 struct lance_softc *sc; 706 void *to; 707 int boff, len; 708 { 709 char *buf = sc->sc_mem; 710 711 /* 712 * Just call memcpy() to do the work. 713 */ 714 memcpy(to, buf + boff, len); 715 } 716 717 void 718 lance_zerobuf_contig(sc, boff, len) 719 struct lance_softc *sc; 720 int boff, len; 721 { 722 char *buf = sc->sc_mem; 723 724 /* 725 * Just let memset() do the work 726 */ 727 memset(buf + boff, 0, len); 728 } 729 730 #if 0 731 /* 732 * Examples only; duplicate these and tweak (if necessary) in 733 * machine-specific front-ends. 734 */ 735 736 /* 737 * gap2: two bytes of data followed by two bytes of pad. 738 * 739 * Buffers must be 4-byte aligned. The code doesn't worry about 740 * doing an extra byte. 741 */ 742 743 void 744 lance_copytobuf_gap2(sc, fromv, boff, len) 745 struct lance_softc *sc; 746 void *fromv; 747 int boff; 748 int len; 749 { 750 volatile void *buf = sc->sc_mem; 751 void *from = fromv; 752 volatile u_int16_t *bptr; 753 754 if (boff & 0x1) { 755 /* handle unaligned first byte */ 756 bptr = ((volatile u_int16_t *)buf) + (boff - 1); 757 *bptr = (*from++ << 8) | (*bptr & 0xff); 758 bptr += 2; 759 len--; 760 } else 761 bptr = ((volatile u_int16_t *)buf) + boff; 762 while (len > 1) { 763 *bptr = (from[1] << 8) | (from[0] & 0xff); 764 bptr += 2; 765 from += 2; 766 len -= 2; 767 } 768 if (len == 1) 769 *bptr = (u_int16_t)*from; 770 } 771 772 void 773 lance_copyfrombuf_gap2(sc, tov, boff, len) 774 struct lance_softc *sc; 775 void *tov; 776 int boff, len; 777 { 778 volatile void *buf = sc->sc_mem; 779 void *to = tov; 780 volatile u_int16_t *bptr; 781 u_int16_t tmp; 782 783 if (boff & 0x1) { 784 /* handle unaligned first byte */ 785 bptr = ((volatile u_int16_t *)buf) + (boff - 1); 786 *to++ = (*bptr >> 8) & 0xff; 787 bptr += 2; 788 len--; 789 } else 790 bptr = ((volatile u_int16_t *)buf) + boff; 791 while (len > 1) { 792 tmp = *bptr; 793 *to++ = tmp & 0xff; 794 *to++ = (tmp >> 8) & 0xff; 795 bptr += 2; 796 len -= 2; 797 } 798 if (len == 1) 799 *to = *bptr & 0xff; 800 } 801 802 void 803 lance_zerobuf_gap2(sc, boff, len) 804 struct lance_softc *sc; 805 int boff, len; 806 { 807 volatile void *buf = sc->sc_mem; 808 volatile u_int16_t *bptr; 809 810 if ((unsigned)boff & 0x1) { 811 bptr = ((volatile u_int16_t *)buf) + (boff - 1); 812 *bptr &= 0xff; 813 bptr += 2; 814 len--; 815 } else 816 bptr = ((volatile u_int16_t *)buf) + boff; 817 while (len > 0) { 818 *bptr = 0; 819 bptr += 2; 820 len -= 2; 821 } 822 } 823 824 /* 825 * gap16: 16 bytes of data followed by 16 bytes of pad. 826 * 827 * Buffers must be 32-byte aligned. 828 */ 829 830 void 831 lance_copytobuf_gap16(sc, fromv, boff, len) 832 struct lance_softc *sc; 833 void *fromv; 834 int boff; 835 int len; 836 { 837 volatile void *buf = sc->sc_mem; 838 void *from = fromv; 839 void *bptr; 840 int xfer; 841 842 bptr = buf + ((boff << 1) & ~0x1f); 843 boff &= 0xf; 844 xfer = min(len, 16 - boff); 845 while (len > 0) { 846 memcpy(bptr + boff, from, xfer); 847 from += xfer; 848 bptr += 32; 849 boff = 0; 850 len -= xfer; 851 xfer = min(len, 16); 852 } 853 } 854 855 void 856 lance_copyfrombuf_gap16(sc, tov, boff, len) 857 struct lance_softc *sc; 858 void *tov; 859 int boff, len; 860 { 861 volatile void *buf = sc->sc_mem; 862 void *to = tov; 863 void *bptr; 864 int xfer; 865 866 bptr = buf + ((boff << 1) & ~0x1f); 867 boff &= 0xf; 868 xfer = min(len, 16 - boff); 869 while (len > 0) { 870 memcpy(to, bptr + boff, xfer); 871 to += xfer; 872 bptr += 32; 873 boff = 0; 874 len -= xfer; 875 xfer = min(len, 16); 876 } 877 } 878 879 void 880 lance_zerobuf_gap16(sc, boff, len) 881 struct lance_softc *sc; 882 int boff, len; 883 { 884 volatile void *buf = sc->sc_mem; 885 void *bptr; 886 int xfer; 887 888 bptr = buf + ((boff << 1) & ~0x1f); 889 boff &= 0xf; 890 xfer = min(len, 16 - boff); 891 while (len > 0) { 892 memset(bptr + boff, 0, xfer); 893 bptr += 32; 894 boff = 0; 895 len -= xfer; 896 xfer = min(len, 16); 897 } 898 } 899 #endif /* Example only */ 900
Indexes created Fri Oct 17 03:10:13 GMT 2025