1 /* $NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 7 * Copyright (C) 1995, 1996 TooLs GmbH. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Copyright (C) 2000 Benno Rice. 37 * All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 48 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 49 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 50 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 51 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 53 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 54 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 55 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 56 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 57 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 58 */ 59 60 #include <sys/cdefs.h> 61 __FBSDID("$FreeBSD$"); 62 63 #include "opt_platform.h" 64 65 #include <sys/param.h> 66 #include <sys/kernel.h> 67 #include <sys/lock.h> 68 #include <sys/malloc.h> 69 #include <sys/mutex.h> 70 #include <sys/queue.h> 71 #include <sys/systm.h> 72 #include <sys/endian.h> 73 74 #include <machine/stdarg.h> 75 76 #include <dev/ofw/ofwvar.h> 77 #include <dev/ofw/openfirm.h> 78 79 #include "ofw_if.h" 80 81 static void OF_putchar(int c, void *arg); 82 83 MALLOC_DEFINE(M_OFWPROP, "openfirm", "Open Firmware properties"); 84 85 static ihandle_t stdout; 86 87 static ofw_def_t *ofw_def_impl = NULL; 88 static ofw_t ofw_obj; 89 static struct ofw_kobj ofw_kernel_obj; 90 static struct kobj_ops ofw_kernel_kops; 91 92 struct xrefinfo { 93 phandle_t xref; 94 phandle_t node; 95 device_t dev; 96 SLIST_ENTRY(xrefinfo) next_entry; 97 }; 98 99 static SLIST_HEAD(, xrefinfo) xreflist = SLIST_HEAD_INITIALIZER(xreflist); 100 static struct mtx xreflist_lock; 101 static boolean_t xref_init_done; 102 103 #define FIND_BY_XREF 0 104 #define FIND_BY_NODE 1 105 #define FIND_BY_DEV 2 106 107 /* 108 * xref-phandle-device lookup helper routines. 109 * 110 * As soon as we are able to use malloc(), walk the node tree and build a list 111 * of info that cross-references node handles, xref handles, and device_t 112 * instances. This list exists primarily to allow association of a device_t 113 * with an xref handle, but it is also used to speed up translation between xref 114 * and node handles. Before malloc() is available we have to recursively search 115 * the node tree each time we want to translate between a node and xref handle. 116 * Afterwards we can do the translations by searching this much shorter list. 117 */ 118 static void 119 xrefinfo_create(phandle_t node) 120 { 121 struct xrefinfo * xi; 122 phandle_t child, xref; 123 124 /* 125 * Recursively descend from parent, looking for nodes with a property 126 * named either "phandle", "ibm,phandle", or "linux,phandle". For each 127 * such node found create an entry in the xreflist. 128 */ 129 for (child = OF_child(node); child != 0; child = OF_peer(child)) { 130 xrefinfo_create(child); 131 if (OF_getencprop(child, "phandle", &xref, sizeof(xref)) == 132 -1 && OF_getencprop(child, "ibm,phandle", &xref, 133 sizeof(xref)) == -1 && OF_getencprop(child, 134 "linux,phandle", &xref, sizeof(xref)) == -1) 135 continue; 136 xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK | M_ZERO); 137 xi->node = child; 138 xi->xref = xref; 139 SLIST_INSERT_HEAD(&xreflist, xi, next_entry); 140 } 141 } 142 143 static void 144 xrefinfo_init(void *unsed) 145 { 146 147 /* 148 * There is no locking during this init because it runs much earlier 149 * than any of the clients/consumers of the xref list data, but we do 150 * initialize the mutex that will be used for access later. 151 */ 152 mtx_init(&xreflist_lock, "OF xreflist lock", NULL, MTX_DEF); 153 xrefinfo_create(OF_peer(0)); 154 xref_init_done = true; 155 } 156 SYSINIT(xrefinfo, SI_SUB_KMEM, SI_ORDER_ANY, xrefinfo_init, NULL); 157 158 static struct xrefinfo * 159 xrefinfo_find(uintptr_t key, int find_by) 160 { 161 struct xrefinfo *rv, *xi; 162 163 rv = NULL; 164 mtx_lock(&xreflist_lock); 165 SLIST_FOREACH(xi, &xreflist, next_entry) { 166 if ((find_by == FIND_BY_XREF && (phandle_t)key == xi->xref) || 167 (find_by == FIND_BY_NODE && (phandle_t)key == xi->node) || 168 (find_by == FIND_BY_DEV && key == (uintptr_t)xi->dev)) { 169 rv = xi; 170 break; 171 } 172 } 173 mtx_unlock(&xreflist_lock); 174 return (rv); 175 } 176 177 static struct xrefinfo * 178 xrefinfo_add(phandle_t node, phandle_t xref, device_t dev) 179 { 180 struct xrefinfo *xi; 181 182 xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK); 183 xi->node = node; 184 xi->xref = xref; 185 xi->dev = dev; 186 mtx_lock(&xreflist_lock); 187 SLIST_INSERT_HEAD(&xreflist, xi, next_entry); 188 mtx_unlock(&xreflist_lock); 189 return (xi); 190 } 191 192 /* 193 * OFW install routines. Highest priority wins, equal priority also 194 * overrides allowing last-set to win. 195 */ 196 SET_DECLARE(ofw_set, ofw_def_t); 197 198 boolean_t 199 OF_install(char *name, int prio) 200 { 201 ofw_def_t *ofwp, **ofwpp; 202 static int curr_prio = 0; 203 204 /* Allow OF layer to be uninstalled */ 205 if (name == NULL) { 206 ofw_def_impl = NULL; 207 return (FALSE); 208 } 209 210 /* 211 * Try and locate the OFW kobj corresponding to the name. 212 */ 213 SET_FOREACH(ofwpp, ofw_set) { 214 ofwp = *ofwpp; 215 216 if (ofwp->name && 217 !strcmp(ofwp->name, name) && 218 prio >= curr_prio) { 219 curr_prio = prio; 220 ofw_def_impl = ofwp; 221 return (TRUE); 222 } 223 } 224 225 return (FALSE); 226 } 227 228 /* Initializer */ 229 int 230 OF_init(void *cookie) 231 { 232 phandle_t chosen; 233 int rv; 234 235 if (ofw_def_impl == NULL) 236 return (-1); 237 238 ofw_obj = &ofw_kernel_obj; 239 /* 240 * Take care of compiling the selected class, and 241 * then statically initialize the OFW object. 242 */ 243 kobj_class_compile_static(ofw_def_impl, &ofw_kernel_kops); 244 kobj_init_static((kobj_t)ofw_obj, ofw_def_impl); 245 246 rv = OFW_INIT(ofw_obj, cookie); 247 248 if ((chosen = OF_finddevice("/chosen")) != -1) 249 if (OF_getencprop(chosen, "stdout", &stdout, 250 sizeof(stdout)) == -1) 251 stdout = -1; 252 253 return (rv); 254 } 255 256 static void 257 OF_putchar(int c, void *arg __unused) 258 { 259 char cbuf; 260 261 if (c == '\n') { 262 cbuf = '\r'; 263 OF_write(stdout, &cbuf, 1); 264 } 265 266 cbuf = c; 267 OF_write(stdout, &cbuf, 1); 268 } 269 270 void 271 OF_printf(const char *fmt, ...) 272 { 273 va_list va; 274 275 va_start(va, fmt); 276 (void)kvprintf(fmt, OF_putchar, NULL, 10, va); 277 va_end(va); 278 } 279 280 /* 281 * Generic functions 282 */ 283 284 /* Test to see if a service exists. */ 285 int 286 OF_test(const char *name) 287 { 288 289 if (ofw_def_impl == NULL) 290 return (-1); 291 292 return (OFW_TEST(ofw_obj, name)); 293 } 294 295 int 296 OF_interpret(const char *cmd, int nreturns, ...) 297 { 298 va_list ap; 299 cell_t slots[16]; 300 int i = 0; 301 int status; 302 303 if (ofw_def_impl == NULL) 304 return (-1); 305 306 status = OFW_INTERPRET(ofw_obj, cmd, nreturns, slots); 307 if (status == -1) 308 return (status); 309 310 va_start(ap, nreturns); 311 while (i < nreturns) 312 *va_arg(ap, cell_t *) = slots[i++]; 313 va_end(ap); 314 315 return (status); 316 } 317 318 /* 319 * Device tree functions 320 */ 321 322 /* Return the next sibling of this node or 0. */ 323 phandle_t 324 OF_peer(phandle_t node) 325 { 326 327 if (ofw_def_impl == NULL) 328 return (0); 329 330 return (OFW_PEER(ofw_obj, node)); 331 } 332 333 /* Return the first child of this node or 0. */ 334 phandle_t 335 OF_child(phandle_t node) 336 { 337 338 if (ofw_def_impl == NULL) 339 return (0); 340 341 return (OFW_CHILD(ofw_obj, node)); 342 } 343 344 /* Return the parent of this node or 0. */ 345 phandle_t 346 OF_parent(phandle_t node) 347 { 348 349 if (ofw_def_impl == NULL) 350 return (0); 351 352 return (OFW_PARENT(ofw_obj, node)); 353 } 354 355 /* Return the package handle that corresponds to an instance handle. */ 356 phandle_t 357 OF_instance_to_package(ihandle_t instance) 358 { 359 360 if (ofw_def_impl == NULL) 361 return (-1); 362 363 return (OFW_INSTANCE_TO_PACKAGE(ofw_obj, instance)); 364 } 365 366 /* Get the length of a property of a package. */ 367 ssize_t 368 OF_getproplen(phandle_t package, const char *propname) 369 { 370 371 if (ofw_def_impl == NULL) 372 return (-1); 373 374 return (OFW_GETPROPLEN(ofw_obj, package, propname)); 375 } 376 377 /* Check existence of a property of a package. */ 378 int 379 OF_hasprop(phandle_t package, const char *propname) 380 { 381 382 return (OF_getproplen(package, propname) >= 0 ? 1 : 0); 383 } 384 385 /* Get the value of a property of a package. */ 386 ssize_t 387 OF_getprop(phandle_t package, const char *propname, void *buf, size_t buflen) 388 { 389 390 if (ofw_def_impl == NULL) 391 return (-1); 392 393 return (OFW_GETPROP(ofw_obj, package, propname, buf, buflen)); 394 } 395 396 ssize_t 397 OF_getencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len) 398 { 399 ssize_t retval; 400 int i; 401 402 KASSERT(len % 4 == 0, ("Need a multiple of 4 bytes")); 403 404 retval = OF_getprop(node, propname, buf, len); 405 if (retval <= 0) 406 return (retval); 407 408 for (i = 0; i < len/4; i++) 409 buf[i] = be32toh(buf[i]); 410 411 return (retval); 412 } 413 414 /* 415 * Recursively search the node and its parent for the given property, working 416 * downward from the node to the device tree root. Returns the value of the 417 * first match. 418 */ 419 ssize_t 420 OF_searchprop(phandle_t node, const char *propname, void *buf, size_t len) 421 { 422 ssize_t rv; 423 424 for (; node != 0; node = OF_parent(node)) 425 if ((rv = OF_getprop(node, propname, buf, len)) != -1) 426 return (rv); 427 return (-1); 428 } 429 430 ssize_t 431 OF_searchencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len) 432 { 433 ssize_t rv; 434 435 for (; node != 0; node = OF_parent(node)) 436 if ((rv = OF_getencprop(node, propname, buf, len)) != -1) 437 return (rv); 438 return (-1); 439 } 440 441 /* 442 * Store the value of a property of a package into newly allocated memory 443 * (using the M_OFWPROP malloc pool and M_WAITOK). 444 */ 445 ssize_t 446 OF_getprop_alloc(phandle_t package, const char *propname, void **buf) 447 { 448 int len; 449 450 *buf = NULL; 451 if ((len = OF_getproplen(package, propname)) == -1) 452 return (-1); 453 454 if (len > 0) { 455 *buf = malloc(len, M_OFWPROP, M_WAITOK); 456 if (OF_getprop(package, propname, *buf, len) == -1) { 457 free(*buf, M_OFWPROP); 458 *buf = NULL; 459 return (-1); 460 } 461 } 462 return (len); 463 } 464 465 /* 466 * Store the value of a property of a package into newly allocated memory 467 * (using the M_OFWPROP malloc pool and M_WAITOK). elsz is the size of a 468 * single element, the number of elements is return in number. 469 */ 470 ssize_t 471 OF_getprop_alloc_multi(phandle_t package, const char *propname, int elsz, void **buf) 472 { 473 int len; 474 475 *buf = NULL; 476 if ((len = OF_getproplen(package, propname)) == -1 || 477 len % elsz != 0) 478 return (-1); 479 480 if (len > 0) { 481 *buf = malloc(len, M_OFWPROP, M_WAITOK); 482 if (OF_getprop(package, propname, *buf, len) == -1) { 483 free(*buf, M_OFWPROP); 484 *buf = NULL; 485 return (-1); 486 } 487 } 488 return (len / elsz); 489 } 490 491 ssize_t 492 OF_getencprop_alloc(phandle_t package, const char *name, void **buf) 493 { 494 ssize_t ret; 495 496 ret = OF_getencprop_alloc_multi(package, name, sizeof(pcell_t), 497 buf); 498 if (ret < 0) 499 return (ret); 500 else 501 return (ret * sizeof(pcell_t)); 502 } 503 504 ssize_t 505 OF_getencprop_alloc_multi(phandle_t package, const char *name, int elsz, 506 void **buf) 507 { 508 ssize_t retval; 509 pcell_t *cell; 510 int i; 511 512 retval = OF_getprop_alloc_multi(package, name, elsz, buf); 513 if (retval == -1) 514 return (-1); 515 516 cell = *buf; 517 for (i = 0; i < retval * elsz / 4; i++) 518 cell[i] = be32toh(cell[i]); 519 520 return (retval); 521 } 522 523 /* Free buffer allocated by OF_getencprop_alloc or OF_getprop_alloc */ 524 void OF_prop_free(void *buf) 525 { 526 527 free(buf, M_OFWPROP); 528 } 529 530 /* Get the next property of a package. */ 531 int 532 OF_nextprop(phandle_t package, const char *previous, char *buf, size_t size) 533 { 534 535 if (ofw_def_impl == NULL) 536 return (-1); 537 538 return (OFW_NEXTPROP(ofw_obj, package, previous, buf, size)); 539 } 540 541 /* Set the value of a property of a package. */ 542 int 543 OF_setprop(phandle_t package, const char *propname, const void *buf, size_t len) 544 { 545 546 if (ofw_def_impl == NULL) 547 return (-1); 548 549 return (OFW_SETPROP(ofw_obj, package, propname, buf,len)); 550 } 551 552 /* Convert a device specifier to a fully qualified pathname. */ 553 ssize_t 554 OF_canon(const char *device, char *buf, size_t len) 555 { 556 557 if (ofw_def_impl == NULL) 558 return (-1); 559 560 return (OFW_CANON(ofw_obj, device, buf, len)); 561 } 562 563 /* Return a package handle for the specified device. */ 564 phandle_t 565 OF_finddevice(const char *device) 566 { 567 568 if (ofw_def_impl == NULL) 569 return (-1); 570 571 return (OFW_FINDDEVICE(ofw_obj, device)); 572 } 573 574 /* Return the fully qualified pathname corresponding to an instance. */ 575 ssize_t 576 OF_instance_to_path(ihandle_t instance, char *buf, size_t len) 577 { 578 579 if (ofw_def_impl == NULL) 580 return (-1); 581 582 return (OFW_INSTANCE_TO_PATH(ofw_obj, instance, buf, len)); 583 } 584 585 /* Return the fully qualified pathname corresponding to a package. */ 586 ssize_t 587 OF_package_to_path(phandle_t package, char *buf, size_t len) 588 { 589 590 if (ofw_def_impl == NULL) 591 return (-1); 592 593 return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len)); 594 } 595 596 /* Look up effective phandle (see FDT/PAPR spec) */ 597 static phandle_t 598 OF_child_xref_phandle(phandle_t parent, phandle_t xref) 599 { 600 phandle_t child, rxref; 601 602 /* 603 * Recursively descend from parent, looking for a node with a property 604 * named either "phandle", "ibm,phandle", or "linux,phandle" that 605 * matches the xref we are looking for. 606 */ 607 608 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 609 rxref = OF_child_xref_phandle(child, xref); 610 if (rxref != -1) 611 return (rxref); 612 613 if (OF_getencprop(child, "phandle", &rxref, sizeof(rxref)) == 614 -1 && OF_getencprop(child, "ibm,phandle", &rxref, 615 sizeof(rxref)) == -1 && OF_getencprop(child, 616 "linux,phandle", &rxref, sizeof(rxref)) == -1) 617 continue; 618 619 if (rxref == xref) 620 return (child); 621 } 622 623 return (-1); 624 } 625 626 phandle_t 627 OF_node_from_xref(phandle_t xref) 628 { 629 struct xrefinfo *xi; 630 phandle_t node; 631 632 if (xref_init_done) { 633 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 634 return (xref); 635 return (xi->node); 636 } 637 638 if ((node = OF_child_xref_phandle(OF_peer(0), xref)) == -1) 639 return (xref); 640 return (node); 641 } 642 643 phandle_t 644 OF_xref_from_node(phandle_t node) 645 { 646 struct xrefinfo *xi; 647 phandle_t xref; 648 649 if (xref_init_done) { 650 if ((xi = xrefinfo_find(node, FIND_BY_NODE)) == NULL) 651 return (node); 652 return (xi->xref); 653 } 654 655 if (OF_getencprop(node, "phandle", &xref, sizeof(xref)) == -1 && 656 OF_getencprop(node, "ibm,phandle", &xref, sizeof(xref)) == -1 && 657 OF_getencprop(node, "linux,phandle", &xref, sizeof(xref)) == -1) 658 return (node); 659 return (xref); 660 } 661 662 device_t 663 OF_device_from_xref(phandle_t xref) 664 { 665 struct xrefinfo *xi; 666 667 if (xref_init_done) { 668 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 669 return (NULL); 670 return (xi->dev); 671 } 672 panic("Attempt to find device before xreflist_init"); 673 } 674 675 phandle_t 676 OF_xref_from_device(device_t dev) 677 { 678 struct xrefinfo *xi; 679 680 if (xref_init_done) { 681 if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL) 682 return (0); 683 return (xi->xref); 684 } 685 panic("Attempt to find xref before xreflist_init"); 686 } 687 688 int 689 OF_device_register_xref(phandle_t xref, device_t dev) 690 { 691 struct xrefinfo *xi; 692 693 /* 694 * If the given xref handle doesn't already exist in the list then we 695 * add a list entry. In theory this can only happen on a system where 696 * nodes don't contain phandle properties and xref and node handles are 697 * synonymous, so the xref handle is added as the node handle as well. 698 */ 699 if (xref_init_done) { 700 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 701 xrefinfo_add(xref, xref, dev); 702 else 703 xi->dev = dev; 704 return (0); 705 } 706 panic("Attempt to register device before xreflist_init"); 707 } 708 709 /* Call the method in the scope of a given instance. */ 710 int 711 OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns, 712 ...) 713 { 714 va_list ap; 715 cell_t args_n_results[12]; 716 int n, status; 717 718 if (nargs > 6 || ofw_def_impl == NULL) 719 return (-1); 720 va_start(ap, nreturns); 721 for (n = 0; n < nargs; n++) 722 args_n_results[n] = va_arg(ap, cell_t); 723 724 status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns, 725 args_n_results); 726 if (status != 0) 727 return (status); 728 729 for (; n < nargs + nreturns; n++) 730 *va_arg(ap, cell_t *) = args_n_results[n]; 731 va_end(ap); 732 return (0); 733 } 734 735 /* 736 * Device I/O functions 737 */ 738 739 /* Open an instance for a device. */ 740 ihandle_t 741 OF_open(const char *device) 742 { 743 744 if (ofw_def_impl == NULL) 745 return (0); 746 747 return (OFW_OPEN(ofw_obj, device)); 748 } 749 750 /* Close an instance. */ 751 void 752 OF_close(ihandle_t instance) 753 { 754 755 if (ofw_def_impl == NULL) 756 return; 757 758 OFW_CLOSE(ofw_obj, instance); 759 } 760 761 /* Read from an instance. */ 762 ssize_t 763 OF_read(ihandle_t instance, void *addr, size_t len) 764 { 765 766 if (ofw_def_impl == NULL) 767 return (-1); 768 769 return (OFW_READ(ofw_obj, instance, addr, len)); 770 } 771 772 /* Write to an instance. */ 773 ssize_t 774 OF_write(ihandle_t instance, const void *addr, size_t len) 775 { 776 777 if (ofw_def_impl == NULL) 778 return (-1); 779 780 return (OFW_WRITE(ofw_obj, instance, addr, len)); 781 } 782 783 /* Seek to a position. */ 784 int 785 OF_seek(ihandle_t instance, uint64_t pos) 786 { 787 788 if (ofw_def_impl == NULL) 789 return (-1); 790 791 return (OFW_SEEK(ofw_obj, instance, pos)); 792 } 793 794 /* 795 * Memory functions 796 */ 797 798 /* Claim an area of memory. */ 799 void * 800 OF_claim(void *virt, size_t size, u_int align) 801 { 802 803 if (ofw_def_impl == NULL) 804 return ((void *)-1); 805 806 return (OFW_CLAIM(ofw_obj, virt, size, align)); 807 } 808 809 /* Release an area of memory. */ 810 void 811 OF_release(void *virt, size_t size) 812 { 813 814 if (ofw_def_impl == NULL) 815 return; 816 817 OFW_RELEASE(ofw_obj, virt, size); 818 } 819 820 /* 821 * Control transfer functions 822 */ 823 824 /* Suspend and drop back to the Open Firmware interface. */ 825 void 826 OF_enter(void) 827 { 828 829 if (ofw_def_impl == NULL) 830 return; 831 832 OFW_ENTER(ofw_obj); 833 } 834 835 /* Shut down and drop back to the Open Firmware interface. */ 836 void 837 OF_exit(void) 838 { 839 840 if (ofw_def_impl == NULL) 841 panic("OF_exit: Open Firmware not available"); 842 843 /* Should not return */ 844 OFW_EXIT(ofw_obj); 845 846 for (;;) /* just in case */ 847 ; 848 } 849