lance.c revision 1.44
1 /* $NetBSD: lance.c,v 1.44 2010/01/19 22:06:24 pooka 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1992, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Ralph Campbell and Rick Macklem. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)if_le.c 8.2 (Berkeley) 11/16/93 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: lance.c,v 1.44 2010/01/19 22:06:24 pooka Exp $"); 69 70 #include "rnd.h" 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/mbuf.h> 75 #include <sys/syslog.h> 76 #include <sys/socket.h> 77 #include <sys/device.h> 78 #include <sys/malloc.h> 79 #include <sys/ioctl.h> 80 #include <sys/errno.h> 81 #if NRND > 0 82 #include <sys/rnd.h> 83 #endif 84 85 #include <net/if.h> 86 #include <net/if_dl.h> 87 #include <net/if_ether.h> 88 #include <net/if_media.h> 89 90 91 #include <net/bpf.h> 92 #include <net/bpfdesc.h> 93 94 #include <dev/ic/lancereg.h> 95 #include <dev/ic/lancevar.h> 96 97 #if defined(_KERNEL_OPT) 98 #include "opt_ddb.h" 99 #endif 100 101 #ifdef DDB 102 #define integrate 103 #define hide 104 #else 105 #define integrate static inline 106 #define hide static 107 #endif 108 109 integrate struct mbuf *lance_get(struct lance_softc *, int, int); 110 111 hide bool lance_shutdown(device_t, int); 112 113 int lance_mediachange(struct ifnet *); 114 void lance_mediastatus(struct ifnet *, struct ifmediareq *); 115 116 static inline u_int16_t ether_cmp(void *, void *); 117 118 void lance_stop(struct ifnet *, int); 119 int lance_ioctl(struct ifnet *, u_long, void *); 120 void lance_watchdog(struct ifnet *); 121 122 /* 123 * Compare two Ether/802 addresses for equality, inlined and 124 * unrolled for speed. Use this like memcmp(). 125 * 126 * XXX: Add <machine/inlines.h> for stuff like this? 127 * XXX: or maybe add it to libkern.h instead? 128 * 129 * "I'd love to have an inline assembler version of this." 130 * XXX: Who wanted that? mycroft? I wrote one, but this 131 * version in C is as good as hand-coded assembly. -gwr 132 * 133 * Please do NOT tweak this without looking at the actual 134 * assembly code generated before and after your tweaks! 135 */ 136 static inline uint16_t 137 ether_cmp(void *one, void *two) 138 { 139 uint16_t *a = (uint16_t *)one; 140 uint16_t *b = (uint16_t *)two; 141 uint16_t diff; 142 143 #ifdef m68k 144 /* 145 * The post-increment-pointer form produces the best 146 * machine code for m68k. This was carefully tuned 147 * so it compiles to just 8 short (2-byte) op-codes! 148 */ 149 diff = *a++ - *b++; 150 diff |= *a++ - *b++; 151 diff |= *a++ - *b++; 152 #else 153 /* 154 * Most modern CPUs do better with a single expresion. 155 * Note that short-cut evaluation is NOT helpful here, 156 * because it just makes the code longer, not faster! 157 */ 158 diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]); 159 #endif 160 161 return (diff); 162 } 163 164 #define ETHER_CMP ether_cmp 165 166 #ifdef LANCE_REVC_BUG 167 /* Make sure this is short-aligned, for ether_cmp(). */ 168 static uint16_t bcast_enaddr[3] = { ~0, ~0, ~0 }; 169 #endif 170 171 void 172 lance_config(struct lance_softc *sc) 173 { 174 int i, nbuf; 175 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 176 177 /* Initialize ifnet structure. */ 178 strcpy(ifp->if_xname, device_xname(sc->sc_dev)); 179 ifp->if_softc = sc; 180 ifp->if_start = sc->sc_start; 181 ifp->if_ioctl = lance_ioctl; 182 ifp->if_watchdog = lance_watchdog; 183 ifp->if_init = lance_init; 184 ifp->if_stop = lance_stop; 185 ifp->if_flags = 186 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 187 #ifdef LANCE_REVC_BUG 188 ifp->if_flags &= ~IFF_MULTICAST; 189 #endif 190 IFQ_SET_READY(&ifp->if_snd); 191 192 /* Initialize ifmedia structures. */ 193 ifmedia_init(&sc->sc_media, 0, lance_mediachange, lance_mediastatus); 194 if (sc->sc_supmedia != NULL) { 195 for (i = 0; i < sc->sc_nsupmedia; i++) 196 ifmedia_add(&sc->sc_media, sc->sc_supmedia[i], 197 0, NULL); 198 ifmedia_set(&sc->sc_media, sc->sc_defaultmedia); 199 } else { 200 ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL); 201 ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL); 202 } 203 204 switch (sc->sc_memsize) { 205 case 8192: 206 sc->sc_nrbuf = 4; 207 sc->sc_ntbuf = 1; 208 break; 209 case 16384: 210 sc->sc_nrbuf = 8; 211 sc->sc_ntbuf = 2; 212 break; 213 case 32768: 214 sc->sc_nrbuf = 16; 215 sc->sc_ntbuf = 4; 216 break; 217 case 65536: 218 sc->sc_nrbuf = 32; 219 sc->sc_ntbuf = 8; 220 break; 221 case 131072: 222 sc->sc_nrbuf = 64; 223 sc->sc_ntbuf = 16; 224 break; 225 case 262144: 226 sc->sc_nrbuf = 128; 227 sc->sc_ntbuf = 32; 228 break; 229 default: 230 /* weird memory size; cope with it */ 231 nbuf = sc->sc_memsize / LEBLEN; 232 sc->sc_ntbuf = nbuf / 5; 233 sc->sc_nrbuf = nbuf - sc->sc_ntbuf; 234 } 235 236 aprint_normal(": address %s\n", ether_sprintf(sc->sc_enaddr)); 237 aprint_normal_dev(sc->sc_dev, 238 "%d receive buffers, %d transmit buffers\n", 239 sc->sc_nrbuf, sc->sc_ntbuf); 240 241 /* Make sure the chip is stopped. */ 242 lance_stop(ifp, 0); 243 244 /* claim 802.1q capability */ 245 sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; 246 /* Attach the interface. */ 247 if_attach(ifp); 248 ether_ifattach(ifp, sc->sc_enaddr); 249 250 if (pmf_device_register1(sc->sc_dev, NULL, NULL, lance_shutdown)) 251 pmf_class_network_register(sc->sc_dev, ifp); 252 else 253 aprint_error_dev(sc->sc_dev, 254 "couldn't establish power handler\n"); 255 256 sc->sc_rbufaddr = malloc(sc->sc_nrbuf * sizeof(int), M_DEVBUF, 257 M_WAITOK); 258 sc->sc_tbufaddr = malloc(sc->sc_ntbuf * sizeof(int), M_DEVBUF, 259 M_WAITOK); 260 261 #if NRND > 0 262 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), 263 RND_TYPE_NET, 0); 264 #endif 265 } 266 267 void 268 lance_reset(struct lance_softc *sc) 269 { 270 int s; 271 272 s = splnet(); 273 lance_init(&sc->sc_ethercom.ec_if); 274 splx(s); 275 } 276 277 void 278 lance_stop(struct ifnet *ifp, int disable) 279 { 280 struct lance_softc *sc = ifp->if_softc; 281 282 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 283 } 284 285 /* 286 * Initialization of interface; set up initialization block 287 * and transmit/receive descriptor rings. 288 */ 289 int 290 lance_init(struct ifnet *ifp) 291 { 292 struct lance_softc *sc = ifp->if_softc; 293 int timo; 294 u_long a; 295 296 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 297 DELAY(100); 298 299 /* Newer LANCE chips have a reset register */ 300 if (sc->sc_hwreset) 301 (*sc->sc_hwreset)(sc); 302 303 /* Set the correct byte swapping mode, etc. */ 304 (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3); 305 306 /* Set up LANCE init block. */ 307 (*sc->sc_meminit)(sc); 308 309 /* Give LANCE the physical address of its init block. */ 310 a = sc->sc_addr + LE_INITADDR(sc); 311 (*sc->sc_wrcsr)(sc, LE_CSR1, a); 312 (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16); 313 314 /* Try to initialize the LANCE. */ 315 DELAY(100); 316 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT); 317 318 /* Wait for initialization to finish. */ 319 for (timo = 100000; timo; timo--) 320 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) 321 break; 322 323 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) { 324 /* Start the LANCE. */ 325 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT); 326 ifp->if_flags |= IFF_RUNNING; 327 ifp->if_flags &= ~IFF_OACTIVE; 328 ifp->if_timer = 0; 329 (*sc->sc_start)(ifp); 330 } else 331 printf("%s: controller failed to initialize\n", 332 device_xname(sc->sc_dev)); 333 if (sc->sc_hwinit) 334 (*sc->sc_hwinit)(sc); 335 336 return (0); 337 } 338 339 /* 340 * Routine to copy from mbuf chain to transmit buffer in 341 * network buffer memory. 342 */ 343 int 344 lance_put(struct lance_softc *sc, int boff, struct mbuf *m) 345 { 346 struct mbuf *n; 347 int len, tlen = 0; 348 349 for (; m; m = n) { 350 len = m->m_len; 351 if (len == 0) { 352 MFREE(m, n); 353 continue; 354 } 355 (*sc->sc_copytobuf)(sc, mtod(m, void *), boff, len); 356 boff += len; 357 tlen += len; 358 MFREE(m, n); 359 } 360 if (tlen < LEMINSIZE) { 361 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen); 362 tlen = LEMINSIZE; 363 } 364 return (tlen); 365 } 366 367 /* 368 * Pull data off an interface. 369 * Len is length of data, with local net header stripped. 370 * We copy the data into mbufs. When full cluster sized units are present 371 * we copy into clusters. 372 */ 373 integrate struct mbuf * 374 lance_get(struct lance_softc *sc, int boff, int totlen) 375 { 376 struct mbuf *m, *m0, *newm; 377 int len; 378 379 MGETHDR(m0, M_DONTWAIT, MT_DATA); 380 if (m0 == 0) 381 return (0); 382 m0->m_pkthdr.rcvif = &sc->sc_ethercom.ec_if; 383 m0->m_pkthdr.len = totlen; 384 len = MHLEN; 385 m = m0; 386 387 while (totlen > 0) { 388 if (totlen >= MINCLSIZE) { 389 MCLGET(m, M_DONTWAIT); 390 if ((m->m_flags & M_EXT) == 0) 391 goto bad; 392 len = MCLBYTES; 393 } 394 395 if (m == m0) { 396 char *newdata = (char *) 397 ALIGN(m->m_data + sizeof(struct ether_header)) - 398 sizeof(struct ether_header); 399 len -= newdata - m->m_data; 400 m->m_data = newdata; 401 } 402 403 m->m_len = len = min(totlen, len); 404 (*sc->sc_copyfrombuf)(sc, mtod(m, void *), boff, len); 405 boff += len; 406 407 totlen -= len; 408 if (totlen > 0) { 409 MGET(newm, M_DONTWAIT, MT_DATA); 410 if (newm == 0) 411 goto bad; 412 len = MLEN; 413 m = m->m_next = newm; 414 } 415 } 416 417 return (m0); 418 419 bad: 420 m_freem(m0); 421 return (0); 422 } 423 424 /* 425 * Pass a packet to the higher levels. 426 */ 427 void 428 lance_read(struct lance_softc *sc, int boff, int len) 429 { 430 struct mbuf *m; 431 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 432 struct ether_header *eh; 433 434 if (len <= sizeof(struct ether_header) || 435 len > ((sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) ? 436 ETHER_VLAN_ENCAP_LEN + ETHERMTU + sizeof(struct ether_header) : 437 ETHERMTU + sizeof(struct ether_header))) { 438 #ifdef LEDEBUG 439 printf("%s: invalid packet size %d; dropping\n", 440 device_xname(sc->sc_dev), len); 441 #endif 442 ifp->if_ierrors++; 443 return; 444 } 445 446 /* Pull packet off interface. */ 447 m = lance_get(sc, boff, len); 448 if (m == 0) { 449 ifp->if_ierrors++; 450 return; 451 } 452 453 ifp->if_ipackets++; 454 455 eh = mtod(m, struct ether_header *); 456 457 #ifdef LANCE_REVC_BUG 458 /* 459 * The old LANCE (Rev. C) chips have a bug which causes 460 * garbage to be inserted in front of the received packet. 461 * The work-around is to ignore packets with an invalid 462 * destination address (garbage will usually not match). 463 * Of course, this precludes multicast support... 464 */ 465 if (ETHER_CMP(eh->ether_dhost, sc->sc_enaddr) && 466 ETHER_CMP(eh->ether_dhost, bcast_enaddr)) { 467 m_freem(m); 468 return; 469 } 470 #endif 471 472 /* 473 * Some lance device does not present IFF_SIMPLEX behavior on multicast 474 * packets. Make sure to drop it if it is from ourselves. 475 */ 476 if (!ETHER_CMP(eh->ether_shost, sc->sc_enaddr)) { 477 m_freem(m); 478 return; 479 } 480 481 /* 482 * Check if there's a BPF listener on this interface. 483 * If so, hand off the raw packet to BPF. 484 */ 485 if (ifp->if_bpf) 486 bpf_ops->bpf_mtap(ifp->if_bpf, m); 487 488 /* Pass the packet up. */ 489 (*ifp->if_input)(ifp, m); 490 } 491 492 #undef ifp 493 494 void 495 lance_watchdog(struct ifnet *ifp) 496 { 497 struct lance_softc *sc = ifp->if_softc; 498 499 log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev)); 500 ++ifp->if_oerrors; 501 502 lance_reset(sc); 503 } 504 505 int 506 lance_mediachange(struct ifnet *ifp) 507 { 508 struct lance_softc *sc = ifp->if_softc; 509 510 if (sc->sc_mediachange) 511 return ((*sc->sc_mediachange)(sc)); 512 return (0); 513 } 514 515 void 516 lance_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr) 517 { 518 struct lance_softc *sc = ifp->if_softc; 519 520 if ((ifp->if_flags & IFF_UP) == 0) 521 return; 522 523 ifmr->ifm_status = IFM_AVALID; 524 if (sc->sc_havecarrier) 525 ifmr->ifm_status |= IFM_ACTIVE; 526 527 if (sc->sc_mediastatus) 528 (*sc->sc_mediastatus)(sc, ifmr); 529 } 530 531 /* 532 * Process an ioctl request. 533 */ 534 int 535 lance_ioctl(struct ifnet *ifp, u_long cmd, void *data) 536 { 537 struct lance_softc *sc = ifp->if_softc; 538 struct ifreq *ifr = (struct ifreq *)data; 539 int s, error = 0; 540 541 s = splnet(); 542 543 switch (cmd) { 544 case SIOCGIFMEDIA: 545 case SIOCSIFMEDIA: 546 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 547 break; 548 default: 549 if ((error = ether_ioctl(ifp, cmd, data)) != ENETRESET) 550 break; 551 error = 0; 552 if (cmd != SIOCADDMULTI && cmd != SIOCDELMULTI) 553 break; 554 if (ifp->if_flags & IFF_RUNNING) { 555 /* 556 * Multicast list has changed; set the hardware filter 557 * accordingly. 558 */ 559 lance_reset(sc); 560 } 561 break; 562 563 } 564 565 splx(s); 566 return (error); 567 } 568 569 hide bool 570 lance_shutdown(device_t self, int howto) 571 { 572 struct lance_softc *sc = device_private(self); 573 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 574 575 lance_stop(ifp, 0); 576 577 return true; 578 } 579 580 /* 581 * Set up the logical address filter. 582 */ 583 void 584 lance_setladrf(struct ethercom *ac, uint16_t *af) 585 { 586 struct ifnet *ifp = &ac->ec_if; 587 struct ether_multi *enm; 588 uint32_t crc; 589 struct ether_multistep step; 590 591 /* 592 * Set up multicast address filter by passing all multicast addresses 593 * through a crc generator, and then using the high order 6 bits as an 594 * index into the 64 bit logical address filter. The high order bit 595 * selects the word, while the rest of the bits select the bit within 596 * the word. 597 */ 598 599 if (ifp->if_flags & IFF_PROMISC) 600 goto allmulti; 601 602 af[0] = af[1] = af[2] = af[3] = 0x0000; 603 ETHER_FIRST_MULTI(step, ac, enm); 604 while (enm != NULL) { 605 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 606 /* 607 * We must listen to a range of multicast addresses. 608 * For now, just accept all multicasts, rather than 609 * trying to set only those filter bits needed to match 610 * the range. (At this time, the only use of address 611 * ranges is for IP multicast routing, for which the 612 * range is big enough to require all bits set.) 613 */ 614 goto allmulti; 615 } 616 617 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN); 618 619 /* Just want the 6 most significant bits. */ 620 crc >>= 26; 621 622 /* Set the corresponding bit in the filter. */ 623 af[crc >> 4] |= 1 << (crc & 0xf); 624 625 ETHER_NEXT_MULTI(step, enm); 626 } 627 ifp->if_flags &= ~IFF_ALLMULTI; 628 return; 629 630 allmulti: 631 ifp->if_flags |= IFF_ALLMULTI; 632 af[0] = af[1] = af[2] = af[3] = 0xffff; 633 } 634 635 /* 636 * Routines for accessing the transmit and receive buffers. 637 * The various CPU and adapter configurations supported by this 638 * driver require three different access methods for buffers 639 * and descriptors: 640 * (1) contig (contiguous data; no padding), 641 * (2) gap2 (two bytes of data followed by two bytes of padding), 642 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 643 */ 644 645 /* 646 * contig: contiguous data with no padding. 647 * 648 * Buffers may have any alignment. 649 */ 650 651 void 652 lance_copytobuf_contig(struct lance_softc *sc, void *from, int boff, int len) 653 { 654 uint8_t *buf = sc->sc_mem; 655 656 /* 657 * Just call memcpy() to do the work. 658 */ 659 memcpy(buf + boff, from, len); 660 } 661 662 void 663 lance_copyfrombuf_contig(struct lance_softc *sc, void *to, 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(to, buf + boff, len); 671 } 672 673 void 674 lance_zerobuf_contig(struct lance_softc *sc, int boff, int len) 675 { 676 uint8_t *buf = sc->sc_mem; 677 678 /* 679 * Just let memset() do the work 680 */ 681 memset(buf + boff, 0, len); 682 } 683 684 #if 0 685 /* 686 * Examples only; duplicate these and tweak (if necessary) in 687 * machine-specific front-ends. 688 */ 689 690 /* 691 * gap2: two bytes of data followed by two bytes of pad. 692 * 693 * Buffers must be 4-byte aligned. The code doesn't worry about 694 * doing an extra byte. 695 */ 696 697 void 698 lance_copytobuf_gap2(struct lance_softc *sc, void *fromv, int boff, int len) 699 { 700 volatile void *buf = sc->sc_mem; 701 void *from = fromv; 702 volatile uint16_t *bptr; 703 704 if (boff & 0x1) { 705 /* handle unaligned first byte */ 706 bptr = ((volatile uint16_t *)buf) + (boff - 1); 707 *bptr = (*from++ << 8) | (*bptr & 0xff); 708 bptr += 2; 709 len--; 710 } else 711 bptr = ((volatile uint16_t *)buf) + boff; 712 while (len > 1) { 713 *bptr = (from[1] << 8) | (from[0] & 0xff); 714 bptr += 2; 715 from += 2; 716 len -= 2; 717 } 718 if (len == 1) 719 *bptr = (uint16_t)*from; 720 } 721 722 void 723 lance_copyfrombuf_gap2(struct lance_softc *sc, void *tov, int boff, int len) 724 { 725 volatile void *buf = sc->sc_mem; 726 void *to = tov; 727 volatile uint16_t *bptr; 728 uint16_t tmp; 729 730 if (boff & 0x1) { 731 /* handle unaligned first byte */ 732 bptr = ((volatile uint16_t *)buf) + (boff - 1); 733 *to++ = (*bptr >> 8) & 0xff; 734 bptr += 2; 735 len--; 736 } else 737 bptr = ((volatile uint16_t *)buf) + boff; 738 while (len > 1) { 739 tmp = *bptr; 740 *to++ = tmp & 0xff; 741 *to++ = (tmp >> 8) & 0xff; 742 bptr += 2; 743 len -= 2; 744 } 745 if (len == 1) 746 *to = *bptr & 0xff; 747 } 748 749 void 750 lance_zerobuf_gap2(struct lance_softc *sc, int boff, int len) 751 { 752 volatile void *buf = sc->sc_mem; 753 volatile uint16_t *bptr; 754 755 if ((unsigned int)boff & 0x1) { 756 bptr = ((volatile uint16_t *)buf) + (boff - 1); 757 *bptr &= 0xff; 758 bptr += 2; 759 len--; 760 } else 761 bptr = ((volatile uint16_t *)buf) + boff; 762 while (len > 0) { 763 *bptr = 0; 764 bptr += 2; 765 len -= 2; 766 } 767 } 768 769 /* 770 * gap16: 16 bytes of data followed by 16 bytes of pad. 771 * 772 * Buffers must be 32-byte aligned. 773 */ 774 775 void 776 lance_copytobuf_gap16(struct lance_softc *sc, void *fromv, int boff, int len) 777 { 778 volatile uint8_t *buf = sc->sc_mem; 779 void *from = fromv; 780 uint8_t *bptr; 781 int xfer; 782 783 bptr = buf + ((boff << 1) & ~0x1f); 784 boff &= 0xf; 785 xfer = min(len, 16 - boff); 786 while (len > 0) { 787 memcpy(bptr + boff, from, xfer); 788 from += xfer; 789 bptr += 32; 790 boff = 0; 791 len -= xfer; 792 xfer = min(len, 16); 793 } 794 } 795 796 void 797 lance_copyfrombuf_gap16(struct lance_softc *sc, void *tov, int boff, int len) 798 { 799 volatile uint8_t *buf = sc->sc_mem; 800 void *to = tov; 801 uint8_t *bptr; 802 int xfer; 803 804 bptr = buf + ((boff << 1) & ~0x1f); 805 boff &= 0xf; 806 xfer = min(len, 16 - boff); 807 while (len > 0) { 808 memcpy(to, bptr + boff, xfer); 809 to += xfer; 810 bptr += 32; 811 boff = 0; 812 len -= xfer; 813 xfer = min(len, 16); 814 } 815 } 816 817 void 818 lance_zerobuf_gap16(struct lance_softc *sc, int boff, int len) 819 { 820 volatile uint8_t *buf = sc->sc_mem; 821 uint8_t *bptr; 822 int xfer; 823 824 bptr = buf + ((boff << 1) & ~0x1f); 825 boff &= 0xf; 826 xfer = min(len, 16 - boff); 827 while (len > 0) { 828 memset(bptr + boff, 0, xfer); 829 bptr += 32; 830 boff = 0; 831 len -= xfer; 832 xfer = min(len, 16); 833 } 834 } 835 #endif /* Example only */ 836
Indexes created Mon Oct 20 01:09:56 GMT 2025