lance.c revision 1.42
1 /* $NetBSD: lance.c,v 1.42 2008/11/07 00:20:02 dyoung 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 1.42 2008/11/07 00:20:02 dyoung Exp $"); 69 70 #include "bpfilter.h" 71 #include "rnd.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/mbuf.h> 76 #include <sys/syslog.h> 77 #include <sys/socket.h> 78 #include <sys/device.h> 79 #include <sys/malloc.h> 80 #include <sys/ioctl.h> 81 #include <sys/errno.h> 82 #if NRND > 0 83 #include <sys/rnd.h> 84 #endif 85 86 #include <net/if.h> 87 #include <net/if_dl.h> 88 #include <net/if_ether.h> 89 #include <net/if_media.h> 90 91 92 #if NBPFILTER > 0 93 #include <net/bpf.h> 94 #include <net/bpfdesc.h> 95 #endif 96 97 #include <dev/ic/lancereg.h> 98 #include <dev/ic/lancevar.h> 99 100 #if defined(_KERNEL_OPT) 101 #include "opt_ddb.h" 102 #endif 103 104 #ifdef DDB 105 #define integrate 106 #define hide 107 #else 108 #define integrate static inline 109 #define hide static 110 #endif 111 112 integrate struct mbuf *lance_get(struct lance_softc *, int, int); 113 114 hide void lance_shutdown(void *); 115 116 int lance_mediachange(struct ifnet *); 117 void lance_mediastatus(struct ifnet *, struct ifmediareq *); 118 119 static inline u_int16_t ether_cmp(void *, void *); 120 121 void lance_stop(struct ifnet *, int); 122 int lance_ioctl(struct ifnet *, u_long, void *); 123 void lance_watchdog(struct ifnet *); 124 125 /* 126 * Compare two Ether/802 addresses for equality, inlined and 127 * unrolled for speed. Use this like memcmp(). 128 * 129 * XXX: Add <machine/inlines.h> for stuff like this? 130 * XXX: or maybe add it to libkern.h instead? 131 * 132 * "I'd love to have an inline assembler version of this." 133 * XXX: Who wanted that? mycroft? I wrote one, but this 134 * version in C is as good as hand-coded assembly. -gwr 135 * 136 * Please do NOT tweak this without looking at the actual 137 * assembly code generated before and after your tweaks! 138 */ 139 static inline uint16_t 140 ether_cmp(void *one, void *two) 141 { 142 uint16_t *a = (uint16_t *)one; 143 uint16_t *b = (uint16_t *)two; 144 uint16_t diff; 145 146 #ifdef m68k 147 /* 148 * The post-increment-pointer form produces the best 149 * machine code for m68k. This was carefully tuned 150 * so it compiles to just 8 short (2-byte) op-codes! 151 */ 152 diff = *a++ - *b++; 153 diff |= *a++ - *b++; 154 diff |= *a++ - *b++; 155 #else 156 /* 157 * Most modern CPUs do better with a single expresion. 158 * Note that short-cut evaluation is NOT helpful here, 159 * because it just makes the code longer, not faster! 160 */ 161 diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]); 162 #endif 163 164 return (diff); 165 } 166 167 #define ETHER_CMP ether_cmp 168 169 #ifdef LANCE_REVC_BUG 170 /* Make sure this is short-aligned, for ether_cmp(). */ 171 static uint16_t bcast_enaddr[3] = { ~0, ~0, ~0 }; 172 #endif 173 174 void 175 lance_config(struct lance_softc *sc) 176 { 177 int i, nbuf; 178 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 179 180 /* Initialize ifnet structure. */ 181 strcpy(ifp->if_xname, device_xname(sc->sc_dev)); 182 ifp->if_softc = sc; 183 ifp->if_start = sc->sc_start; 184 ifp->if_ioctl = lance_ioctl; 185 ifp->if_watchdog = lance_watchdog; 186 ifp->if_init = lance_init; 187 ifp->if_stop = lance_stop; 188 ifp->if_flags = 189 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 190 #ifdef LANCE_REVC_BUG 191 ifp->if_flags &= ~IFF_MULTICAST; 192 #endif 193 IFQ_SET_READY(&ifp->if_snd); 194 195 /* Initialize ifmedia structures. */ 196 ifmedia_init(&sc->sc_media, 0, lance_mediachange, lance_mediastatus); 197 if (sc->sc_supmedia != NULL) { 198 for (i = 0; i < sc->sc_nsupmedia; i++) 199 ifmedia_add(&sc->sc_media, sc->sc_supmedia[i], 200 0, NULL); 201 ifmedia_set(&sc->sc_media, sc->sc_defaultmedia); 202 } else { 203 ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL); 204 ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL); 205 } 206 207 switch (sc->sc_memsize) { 208 case 8192: 209 sc->sc_nrbuf = 4; 210 sc->sc_ntbuf = 1; 211 break; 212 case 16384: 213 sc->sc_nrbuf = 8; 214 sc->sc_ntbuf = 2; 215 break; 216 case 32768: 217 sc->sc_nrbuf = 16; 218 sc->sc_ntbuf = 4; 219 break; 220 case 65536: 221 sc->sc_nrbuf = 32; 222 sc->sc_ntbuf = 8; 223 break; 224 case 131072: 225 sc->sc_nrbuf = 64; 226 sc->sc_ntbuf = 16; 227 break; 228 case 262144: 229 sc->sc_nrbuf = 128; 230 sc->sc_ntbuf = 32; 231 break; 232 default: 233 /* weird memory size; cope with it */ 234 nbuf = sc->sc_memsize / LEBLEN; 235 sc->sc_ntbuf = nbuf / 5; 236 sc->sc_nrbuf = nbuf - sc->sc_ntbuf; 237 } 238 239 aprint_normal(": address %s\n", ether_sprintf(sc->sc_enaddr)); 240 aprint_normal_dev(sc->sc_dev, 241 "%d receive buffers, %d transmit buffers\n", 242 sc->sc_nrbuf, sc->sc_ntbuf); 243 244 /* Make sure the chip is stopped. */ 245 lance_stop(ifp, 0); 246 247 /* claim 802.1q capability */ 248 sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; 249 /* Attach the interface. */ 250 if_attach(ifp); 251 ether_ifattach(ifp, sc->sc_enaddr); 252 253 sc->sc_sh = shutdownhook_establish(lance_shutdown, ifp); 254 if (sc->sc_sh == NULL) 255 panic("lance_config: can't establish shutdownhook"); 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 #if NBPFILTER > 0 482 /* 483 * Check if there's a BPF listener on this interface. 484 * If so, hand off the raw packet to BPF. 485 */ 486 if (ifp->if_bpf) 487 bpf_mtap(ifp->if_bpf, m); 488 #endif 489 490 /* Pass the packet up. */ 491 (*ifp->if_input)(ifp, m); 492 } 493 494 #undef ifp 495 496 void 497 lance_watchdog(struct ifnet *ifp) 498 { 499 struct lance_softc *sc = ifp->if_softc; 500 501 log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev)); 502 ++ifp->if_oerrors; 503 504 lance_reset(sc); 505 } 506 507 int 508 lance_mediachange(struct ifnet *ifp) 509 { 510 struct lance_softc *sc = ifp->if_softc; 511 512 if (sc->sc_mediachange) 513 return ((*sc->sc_mediachange)(sc)); 514 return (0); 515 } 516 517 void 518 lance_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr) 519 { 520 struct lance_softc *sc = ifp->if_softc; 521 522 if ((ifp->if_flags & IFF_UP) == 0) 523 return; 524 525 ifmr->ifm_status = IFM_AVALID; 526 if (sc->sc_havecarrier) 527 ifmr->ifm_status |= IFM_ACTIVE; 528 529 if (sc->sc_mediastatus) 530 (*sc->sc_mediastatus)(sc, ifmr); 531 } 532 533 /* 534 * Process an ioctl request. 535 */ 536 int 537 lance_ioctl(struct ifnet *ifp, u_long cmd, void *data) 538 { 539 struct lance_softc *sc = ifp->if_softc; 540 struct ifreq *ifr = (struct ifreq *)data; 541 int s, error = 0; 542 543 s = splnet(); 544 545 switch (cmd) { 546 case SIOCGIFMEDIA: 547 case SIOCSIFMEDIA: 548 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 549 break; 550 default: 551 if ((error = ether_ioctl(ifp, cmd, data)) != ENETRESET) 552 break; 553 error = 0; 554 if (cmd != SIOCADDMULTI && cmd != SIOCDELMULTI) 555 break; 556 if (ifp->if_flags & IFF_RUNNING) { 557 /* 558 * Multicast list has changed; set the hardware filter 559 * accordingly. 560 */ 561 lance_reset(sc); 562 } 563 break; 564 565 } 566 567 splx(s); 568 return (error); 569 } 570 571 hide void 572 lance_shutdown(void *arg) 573 { 574 575 lance_stop((struct ifnet *)arg, 0); 576 } 577 578 /* 579 * Set up the logical address filter. 580 */ 581 void 582 lance_setladrf(struct ethercom *ac, uint16_t *af) 583 { 584 struct ifnet *ifp = &ac->ec_if; 585 struct ether_multi *enm; 586 uint32_t crc; 587 struct ether_multistep step; 588 589 /* 590 * Set up multicast address filter by passing all multicast addresses 591 * through a crc generator, and then using the high order 6 bits as an 592 * index into the 64 bit logical address filter. The high order bit 593 * selects the word, while the rest of the bits select the bit within 594 * the word. 595 */ 596 597 if (ifp->if_flags & IFF_PROMISC) 598 goto allmulti; 599 600 af[0] = af[1] = af[2] = af[3] = 0x0000; 601 ETHER_FIRST_MULTI(step, ac, enm); 602 while (enm != NULL) { 603 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 604 /* 605 * We must listen to a range of multicast addresses. 606 * For now, just accept all multicasts, rather than 607 * trying to set only those filter bits needed to match 608 * the range. (At this time, the only use of address 609 * ranges is for IP multicast routing, for which the 610 * range is big enough to require all bits set.) 611 */ 612 goto allmulti; 613 } 614 615 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN); 616 617 /* Just want the 6 most significant bits. */ 618 crc >>= 26; 619 620 /* Set the corresponding bit in the filter. */ 621 af[crc >> 4] |= 1 << (crc & 0xf); 622 623 ETHER_NEXT_MULTI(step, enm); 624 } 625 ifp->if_flags &= ~IFF_ALLMULTI; 626 return; 627 628 allmulti: 629 ifp->if_flags |= IFF_ALLMULTI; 630 af[0] = af[1] = af[2] = af[3] = 0xffff; 631 } 632 633 /* 634 * Routines for accessing the transmit and receive buffers. 635 * The various CPU and adapter configurations supported by this 636 * driver require three different access methods for buffers 637 * and descriptors: 638 * (1) contig (contiguous data; no padding), 639 * (2) gap2 (two bytes of data followed by two bytes of padding), 640 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 641 */ 642 643 /* 644 * contig: contiguous data with no padding. 645 * 646 * Buffers may have any alignment. 647 */ 648 649 void 650 lance_copytobuf_contig(struct lance_softc *sc, void *from, int boff, int len) 651 { 652 uint8_t *buf = sc->sc_mem; 653 654 /* 655 * Just call memcpy() to do the work. 656 */ 657 memcpy(buf + boff, from, len); 658 } 659 660 void 661 lance_copyfrombuf_contig(struct lance_softc *sc, void *to, int boff, int len) 662 { 663 uint8_t *buf = sc->sc_mem; 664 665 /* 666 * Just call memcpy() to do the work. 667 */ 668 memcpy(to, buf + boff, len); 669 } 670 671 void 672 lance_zerobuf_contig(struct lance_softc *sc, int boff, int len) 673 { 674 uint8_t *buf = sc->sc_mem; 675 676 /* 677 * Just let memset() do the work 678 */ 679 memset(buf + boff, 0, len); 680 } 681 682 #if 0 683 /* 684 * Examples only; duplicate these and tweak (if necessary) in 685 * machine-specific front-ends. 686 */ 687 688 /* 689 * gap2: two bytes of data followed by two bytes of pad. 690 * 691 * Buffers must be 4-byte aligned. The code doesn't worry about 692 * doing an extra byte. 693 */ 694 695 void 696 lance_copytobuf_gap2(struct lance_softc *sc, void *fromv, int boff, int len) 697 { 698 volatile void *buf = sc->sc_mem; 699 void *from = fromv; 700 volatile uint16_t *bptr; 701 702 if (boff & 0x1) { 703 /* handle unaligned first byte */ 704 bptr = ((volatile uint16_t *)buf) + (boff - 1); 705 *bptr = (*from++ << 8) | (*bptr & 0xff); 706 bptr += 2; 707 len--; 708 } else 709 bptr = ((volatile uint16_t *)buf) + boff; 710 while (len > 1) { 711 *bptr = (from[1] << 8) | (from[0] & 0xff); 712 bptr += 2; 713 from += 2; 714 len -= 2; 715 } 716 if (len == 1) 717 *bptr = (uint16_t)*from; 718 } 719 720 void 721 lance_copyfrombuf_gap2(struct lance_softc *sc, void *tov, int boff, int len) 722 { 723 volatile void *buf = sc->sc_mem; 724 void *to = tov; 725 volatile uint16_t *bptr; 726 uint16_t tmp; 727 728 if (boff & 0x1) { 729 /* handle unaligned first byte */ 730 bptr = ((volatile uint16_t *)buf) + (boff - 1); 731 *to++ = (*bptr >> 8) & 0xff; 732 bptr += 2; 733 len--; 734 } else 735 bptr = ((volatile uint16_t *)buf) + boff; 736 while (len > 1) { 737 tmp = *bptr; 738 *to++ = tmp & 0xff; 739 *to++ = (tmp >> 8) & 0xff; 740 bptr += 2; 741 len -= 2; 742 } 743 if (len == 1) 744 *to = *bptr & 0xff; 745 } 746 747 void 748 lance_zerobuf_gap2(struct lance_softc *sc, int boff, int len) 749 { 750 volatile void *buf = sc->sc_mem; 751 volatile uint16_t *bptr; 752 753 if ((unsigned int)boff & 0x1) { 754 bptr = ((volatile uint16_t *)buf) + (boff - 1); 755 *bptr &= 0xff; 756 bptr += 2; 757 len--; 758 } else 759 bptr = ((volatile uint16_t *)buf) + boff; 760 while (len > 0) { 761 *bptr = 0; 762 bptr += 2; 763 len -= 2; 764 } 765 } 766 767 /* 768 * gap16: 16 bytes of data followed by 16 bytes of pad. 769 * 770 * Buffers must be 32-byte aligned. 771 */ 772 773 void 774 lance_copytobuf_gap16(struct lance_softc *sc, void *fromv, int boff, int len) 775 { 776 volatile uint8_t *buf = sc->sc_mem; 777 void *from = fromv; 778 uint8_t *bptr; 779 int xfer; 780 781 bptr = buf + ((boff << 1) & ~0x1f); 782 boff &= 0xf; 783 xfer = min(len, 16 - boff); 784 while (len > 0) { 785 memcpy(bptr + boff, from, xfer); 786 from += xfer; 787 bptr += 32; 788 boff = 0; 789 len -= xfer; 790 xfer = min(len, 16); 791 } 792 } 793 794 void 795 lance_copyfrombuf_gap16(struct lance_softc *sc, void *tov, int boff, int len) 796 { 797 volatile uint8_t *buf = sc->sc_mem; 798 void *to = tov; 799 uint8_t *bptr; 800 int xfer; 801 802 bptr = buf + ((boff << 1) & ~0x1f); 803 boff &= 0xf; 804 xfer = min(len, 16 - boff); 805 while (len > 0) { 806 memcpy(to, bptr + boff, xfer); 807 to += xfer; 808 bptr += 32; 809 boff = 0; 810 len -= xfer; 811 xfer = min(len, 16); 812 } 813 } 814 815 void 816 lance_zerobuf_gap16(struct lance_softc *sc, int boff, int len) 817 { 818 volatile uint8_t *buf = sc->sc_mem; 819 uint8_t *bptr; 820 int xfer; 821 822 bptr = buf + ((boff << 1) & ~0x1f); 823 boff &= 0xf; 824 xfer = min(len, 16 - boff); 825 while (len > 0) { 826 memset(bptr + boff, 0, xfer); 827 bptr += 32; 828 boff = 0; 829 len -= xfer; 830 xfer = min(len, 16); 831 } 832 } 833 #endif /* Example only */ 834
Indexes created Wed Sep 24 05:09:52 GMT 2025