lance.c revision 1.40.4.3
1 /* $NetBSD: lance.c,v 1.40.4.3 2009/09/16 13:37:48 yamt 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 1.40.4.3 2009/09/16 13:37:48 yamt 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 bool lance_shutdown(device_t, int); 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 if (pmf_device_register1(sc->sc_dev, NULL, NULL, lance_shutdown)) 254 pmf_class_network_register(sc->sc_dev, ifp); 255 else 256 aprint_error_dev(sc->sc_dev, 257 "couldn't establish power handler\n"); 258 259 sc->sc_rbufaddr = malloc(sc->sc_nrbuf * sizeof(int), M_DEVBUF, 260 M_WAITOK); 261 sc->sc_tbufaddr = malloc(sc->sc_ntbuf * sizeof(int), M_DEVBUF, 262 M_WAITOK); 263 264 #if NRND > 0 265 rnd_attach_source(&sc->rnd_source, device_xname(sc->sc_dev), 266 RND_TYPE_NET, 0); 267 #endif 268 } 269 270 void 271 lance_reset(struct lance_softc *sc) 272 { 273 int s; 274 275 s = splnet(); 276 lance_init(&sc->sc_ethercom.ec_if); 277 splx(s); 278 } 279 280 void 281 lance_stop(struct ifnet *ifp, int disable) 282 { 283 struct lance_softc *sc = ifp->if_softc; 284 285 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 286 } 287 288 /* 289 * Initialization of interface; set up initialization block 290 * and transmit/receive descriptor rings. 291 */ 292 int 293 lance_init(struct ifnet *ifp) 294 { 295 struct lance_softc *sc = ifp->if_softc; 296 int timo; 297 u_long a; 298 299 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 300 DELAY(100); 301 302 /* Newer LANCE chips have a reset register */ 303 if (sc->sc_hwreset) 304 (*sc->sc_hwreset)(sc); 305 306 /* Set the correct byte swapping mode, etc. */ 307 (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3); 308 309 /* Set up LANCE init block. */ 310 (*sc->sc_meminit)(sc); 311 312 /* Give LANCE the physical address of its init block. */ 313 a = sc->sc_addr + LE_INITADDR(sc); 314 (*sc->sc_wrcsr)(sc, LE_CSR1, a); 315 (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16); 316 317 /* Try to initialize the LANCE. */ 318 DELAY(100); 319 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT); 320 321 /* Wait for initialization to finish. */ 322 for (timo = 100000; timo; timo--) 323 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) 324 break; 325 326 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) { 327 /* Start the LANCE. */ 328 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT); 329 ifp->if_flags |= IFF_RUNNING; 330 ifp->if_flags &= ~IFF_OACTIVE; 331 ifp->if_timer = 0; 332 (*sc->sc_start)(ifp); 333 } else 334 printf("%s: controller failed to initialize\n", 335 device_xname(sc->sc_dev)); 336 if (sc->sc_hwinit) 337 (*sc->sc_hwinit)(sc); 338 339 return (0); 340 } 341 342 /* 343 * Routine to copy from mbuf chain to transmit buffer in 344 * network buffer memory. 345 */ 346 int 347 lance_put(struct lance_softc *sc, int boff, struct mbuf *m) 348 { 349 struct mbuf *n; 350 int len, tlen = 0; 351 352 for (; m; m = n) { 353 len = m->m_len; 354 if (len == 0) { 355 MFREE(m, n); 356 continue; 357 } 358 (*sc->sc_copytobuf)(sc, mtod(m, void *), boff, len); 359 boff += len; 360 tlen += len; 361 MFREE(m, n); 362 } 363 if (tlen < LEMINSIZE) { 364 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen); 365 tlen = LEMINSIZE; 366 } 367 return (tlen); 368 } 369 370 /* 371 * Pull data off an interface. 372 * Len is length of data, with local net header stripped. 373 * We copy the data into mbufs. When full cluster sized units are present 374 * we copy into clusters. 375 */ 376 integrate struct mbuf * 377 lance_get(struct lance_softc *sc, int boff, int totlen) 378 { 379 struct mbuf *m, *m0, *newm; 380 int len; 381 382 MGETHDR(m0, M_DONTWAIT, MT_DATA); 383 if (m0 == 0) 384 return (0); 385 m0->m_pkthdr.rcvif = &sc->sc_ethercom.ec_if; 386 m0->m_pkthdr.len = totlen; 387 len = MHLEN; 388 m = m0; 389 390 while (totlen > 0) { 391 if (totlen >= MINCLSIZE) { 392 MCLGET(m, M_DONTWAIT); 393 if ((m->m_flags & M_EXT) == 0) 394 goto bad; 395 len = MCLBYTES; 396 } 397 398 if (m == m0) { 399 char *newdata = (char *) 400 ALIGN(m->m_data + sizeof(struct ether_header)) - 401 sizeof(struct ether_header); 402 len -= newdata - m->m_data; 403 m->m_data = newdata; 404 } 405 406 m->m_len = len = min(totlen, len); 407 (*sc->sc_copyfrombuf)(sc, mtod(m, void *), boff, len); 408 boff += len; 409 410 totlen -= len; 411 if (totlen > 0) { 412 MGET(newm, M_DONTWAIT, MT_DATA); 413 if (newm == 0) 414 goto bad; 415 len = MLEN; 416 m = m->m_next = newm; 417 } 418 } 419 420 return (m0); 421 422 bad: 423 m_freem(m0); 424 return (0); 425 } 426 427 /* 428 * Pass a packet to the higher levels. 429 */ 430 void 431 lance_read(struct lance_softc *sc, int boff, int len) 432 { 433 struct mbuf *m; 434 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 435 struct ether_header *eh; 436 437 if (len <= sizeof(struct ether_header) || 438 len > ((sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) ? 439 ETHER_VLAN_ENCAP_LEN + ETHERMTU + sizeof(struct ether_header) : 440 ETHERMTU + sizeof(struct ether_header))) { 441 #ifdef LEDEBUG 442 printf("%s: invalid packet size %d; dropping\n", 443 device_xname(sc->sc_dev), len); 444 #endif 445 ifp->if_ierrors++; 446 return; 447 } 448 449 /* Pull packet off interface. */ 450 m = lance_get(sc, boff, len); 451 if (m == 0) { 452 ifp->if_ierrors++; 453 return; 454 } 455 456 ifp->if_ipackets++; 457 458 eh = mtod(m, struct ether_header *); 459 460 #ifdef LANCE_REVC_BUG 461 /* 462 * The old LANCE (Rev. C) chips have a bug which causes 463 * garbage to be inserted in front of the received packet. 464 * The work-around is to ignore packets with an invalid 465 * destination address (garbage will usually not match). 466 * Of course, this precludes multicast support... 467 */ 468 if (ETHER_CMP(eh->ether_dhost, sc->sc_enaddr) && 469 ETHER_CMP(eh->ether_dhost, bcast_enaddr)) { 470 m_freem(m); 471 return; 472 } 473 #endif 474 475 /* 476 * Some lance device does not present IFF_SIMPLEX behavior on multicast 477 * packets. Make sure to drop it if it is from ourselves. 478 */ 479 if (!ETHER_CMP(eh->ether_shost, sc->sc_enaddr)) { 480 m_freem(m); 481 return; 482 } 483 484 #if NBPFILTER > 0 485 /* 486 * Check if there's a BPF listener on this interface. 487 * If so, hand off the raw packet to BPF. 488 */ 489 if (ifp->if_bpf) 490 bpf_mtap(ifp->if_bpf, m); 491 #endif 492 493 /* Pass the packet up. */ 494 (*ifp->if_input)(ifp, m); 495 } 496 497 #undef ifp 498 499 void 500 lance_watchdog(struct ifnet *ifp) 501 { 502 struct lance_softc *sc = ifp->if_softc; 503 504 log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev)); 505 ++ifp->if_oerrors; 506 507 lance_reset(sc); 508 } 509 510 int 511 lance_mediachange(struct ifnet *ifp) 512 { 513 struct lance_softc *sc = ifp->if_softc; 514 515 if (sc->sc_mediachange) 516 return ((*sc->sc_mediachange)(sc)); 517 return (0); 518 } 519 520 void 521 lance_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr) 522 { 523 struct lance_softc *sc = ifp->if_softc; 524 525 if ((ifp->if_flags & IFF_UP) == 0) 526 return; 527 528 ifmr->ifm_status = IFM_AVALID; 529 if (sc->sc_havecarrier) 530 ifmr->ifm_status |= IFM_ACTIVE; 531 532 if (sc->sc_mediastatus) 533 (*sc->sc_mediastatus)(sc, ifmr); 534 } 535 536 /* 537 * Process an ioctl request. 538 */ 539 int 540 lance_ioctl(struct ifnet *ifp, u_long cmd, void *data) 541 { 542 struct lance_softc *sc = ifp->if_softc; 543 struct ifreq *ifr = (struct ifreq *)data; 544 int s, error = 0; 545 546 s = splnet(); 547 548 switch (cmd) { 549 case SIOCGIFMEDIA: 550 case SIOCSIFMEDIA: 551 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 552 break; 553 default: 554 if ((error = ether_ioctl(ifp, cmd, data)) != ENETRESET) 555 break; 556 error = 0; 557 if (cmd != SIOCADDMULTI && cmd != SIOCDELMULTI) 558 break; 559 if (ifp->if_flags & IFF_RUNNING) { 560 /* 561 * Multicast list has changed; set the hardware filter 562 * accordingly. 563 */ 564 lance_reset(sc); 565 } 566 break; 567 568 } 569 570 splx(s); 571 return (error); 572 } 573 574 hide bool 575 lance_shutdown(device_t self, int howto) 576 { 577 struct lance_softc *sc = device_private(self); 578 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 579 580 lance_stop(ifp, 0); 581 582 return true; 583 } 584 585 /* 586 * Set up the logical address filter. 587 */ 588 void 589 lance_setladrf(struct ethercom *ac, uint16_t *af) 590 { 591 struct ifnet *ifp = &ac->ec_if; 592 struct ether_multi *enm; 593 uint32_t crc; 594 struct ether_multistep step; 595 596 /* 597 * Set up multicast address filter by passing all multicast addresses 598 * through a crc generator, and then using the high order 6 bits as an 599 * index into the 64 bit logical address filter. The high order bit 600 * selects the word, while the rest of the bits select the bit within 601 * the word. 602 */ 603 604 if (ifp->if_flags & IFF_PROMISC) 605 goto allmulti; 606 607 af[0] = af[1] = af[2] = af[3] = 0x0000; 608 ETHER_FIRST_MULTI(step, ac, enm); 609 while (enm != NULL) { 610 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 611 /* 612 * We must listen to a range of multicast addresses. 613 * For now, just accept all multicasts, rather than 614 * trying to set only those filter bits needed to match 615 * the range. (At this time, the only use of address 616 * ranges is for IP multicast routing, for which the 617 * range is big enough to require all bits set.) 618 */ 619 goto allmulti; 620 } 621 622 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN); 623 624 /* Just want the 6 most significant bits. */ 625 crc >>= 26; 626 627 /* Set the corresponding bit in the filter. */ 628 af[crc >> 4] |= 1 << (crc & 0xf); 629 630 ETHER_NEXT_MULTI(step, enm); 631 } 632 ifp->if_flags &= ~IFF_ALLMULTI; 633 return; 634 635 allmulti: 636 ifp->if_flags |= IFF_ALLMULTI; 637 af[0] = af[1] = af[2] = af[3] = 0xffff; 638 } 639 640 /* 641 * Routines for accessing the transmit and receive buffers. 642 * The various CPU and adapter configurations supported by this 643 * driver require three different access methods for buffers 644 * and descriptors: 645 * (1) contig (contiguous data; no padding), 646 * (2) gap2 (two bytes of data followed by two bytes of padding), 647 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 648 */ 649 650 /* 651 * contig: contiguous data with no padding. 652 * 653 * Buffers may have any alignment. 654 */ 655 656 void 657 lance_copytobuf_contig(struct lance_softc *sc, void *from, int boff, int len) 658 { 659 uint8_t *buf = sc->sc_mem; 660 661 /* 662 * Just call memcpy() to do the work. 663 */ 664 memcpy(buf + boff, from, len); 665 } 666 667 void 668 lance_copyfrombuf_contig(struct lance_softc *sc, void *to, int boff, int len) 669 { 670 uint8_t *buf = sc->sc_mem; 671 672 /* 673 * Just call memcpy() to do the work. 674 */ 675 memcpy(to, buf + boff, len); 676 } 677 678 void 679 lance_zerobuf_contig(struct lance_softc *sc, int boff, int len) 680 { 681 uint8_t *buf = sc->sc_mem; 682 683 /* 684 * Just let memset() do the work 685 */ 686 memset(buf + boff, 0, len); 687 } 688 689 #if 0 690 /* 691 * Examples only; duplicate these and tweak (if necessary) in 692 * machine-specific front-ends. 693 */ 694 695 /* 696 * gap2: two bytes of data followed by two bytes of pad. 697 * 698 * Buffers must be 4-byte aligned. The code doesn't worry about 699 * doing an extra byte. 700 */ 701 702 void 703 lance_copytobuf_gap2(struct lance_softc *sc, void *fromv, int boff, int len) 704 { 705 volatile void *buf = sc->sc_mem; 706 void *from = fromv; 707 volatile uint16_t *bptr; 708 709 if (boff & 0x1) { 710 /* handle unaligned first byte */ 711 bptr = ((volatile uint16_t *)buf) + (boff - 1); 712 *bptr = (*from++ << 8) | (*bptr & 0xff); 713 bptr += 2; 714 len--; 715 } else 716 bptr = ((volatile uint16_t *)buf) + boff; 717 while (len > 1) { 718 *bptr = (from[1] << 8) | (from[0] & 0xff); 719 bptr += 2; 720 from += 2; 721 len -= 2; 722 } 723 if (len == 1) 724 *bptr = (uint16_t)*from; 725 } 726 727 void 728 lance_copyfrombuf_gap2(struct lance_softc *sc, void *tov, int boff, int len) 729 { 730 volatile void *buf = sc->sc_mem; 731 void *to = tov; 732 volatile uint16_t *bptr; 733 uint16_t tmp; 734 735 if (boff & 0x1) { 736 /* handle unaligned first byte */ 737 bptr = ((volatile uint16_t *)buf) + (boff - 1); 738 *to++ = (*bptr >> 8) & 0xff; 739 bptr += 2; 740 len--; 741 } else 742 bptr = ((volatile uint16_t *)buf) + boff; 743 while (len > 1) { 744 tmp = *bptr; 745 *to++ = tmp & 0xff; 746 *to++ = (tmp >> 8) & 0xff; 747 bptr += 2; 748 len -= 2; 749 } 750 if (len == 1) 751 *to = *bptr & 0xff; 752 } 753 754 void 755 lance_zerobuf_gap2(struct lance_softc *sc, int boff, int len) 756 { 757 volatile void *buf = sc->sc_mem; 758 volatile uint16_t *bptr; 759 760 if ((unsigned int)boff & 0x1) { 761 bptr = ((volatile uint16_t *)buf) + (boff - 1); 762 *bptr &= 0xff; 763 bptr += 2; 764 len--; 765 } else 766 bptr = ((volatile uint16_t *)buf) + boff; 767 while (len > 0) { 768 *bptr = 0; 769 bptr += 2; 770 len -= 2; 771 } 772 } 773 774 /* 775 * gap16: 16 bytes of data followed by 16 bytes of pad. 776 * 777 * Buffers must be 32-byte aligned. 778 */ 779 780 void 781 lance_copytobuf_gap16(struct lance_softc *sc, void *fromv, int boff, int len) 782 { 783 volatile uint8_t *buf = sc->sc_mem; 784 void *from = fromv; 785 uint8_t *bptr; 786 int xfer; 787 788 bptr = buf + ((boff << 1) & ~0x1f); 789 boff &= 0xf; 790 xfer = min(len, 16 - boff); 791 while (len > 0) { 792 memcpy(bptr + boff, from, xfer); 793 from += xfer; 794 bptr += 32; 795 boff = 0; 796 len -= xfer; 797 xfer = min(len, 16); 798 } 799 } 800 801 void 802 lance_copyfrombuf_gap16(struct lance_softc *sc, void *tov, int boff, int len) 803 { 804 volatile uint8_t *buf = sc->sc_mem; 805 void *to = tov; 806 uint8_t *bptr; 807 int xfer; 808 809 bptr = buf + ((boff << 1) & ~0x1f); 810 boff &= 0xf; 811 xfer = min(len, 16 - boff); 812 while (len > 0) { 813 memcpy(to, bptr + boff, xfer); 814 to += xfer; 815 bptr += 32; 816 boff = 0; 817 len -= xfer; 818 xfer = min(len, 16); 819 } 820 } 821 822 void 823 lance_zerobuf_gap16(struct lance_softc *sc, int boff, int len) 824 { 825 volatile uint8_t *buf = sc->sc_mem; 826 uint8_t *bptr; 827 int xfer; 828 829 bptr = buf + ((boff << 1) & ~0x1f); 830 boff &= 0xf; 831 xfer = min(len, 16 - boff); 832 while (len > 0) { 833 memset(bptr + boff, 0, xfer); 834 bptr += 32; 835 boff = 0; 836 len -= xfer; 837 xfer = min(len, 16); 838 } 839 } 840 #endif /* Example only */ 841
Indexes created Sun Oct 19 19:09:49 GMT 2025