openfirm.c revision 280848
1/* $NetBSD: Locore.c,v 1.7 2000/08/20 07:04:59 tsubai Exp $ */ 2 3/*- 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33/*- 34 * Copyright (C) 2000 Benno Rice. 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 47 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 49 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 50 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 51 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 52 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 53 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 54 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 55 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58#include <sys/cdefs.h> 59__FBSDID("$FreeBSD: head/sys/dev/ofw/openfirm.c 280848 2015-03-30 09:49:54Z zbb $"); 60 61#include "opt_platform.h" 62 63#include <sys/param.h> 64#include <sys/kernel.h> 65#include <sys/lock.h> 66#include <sys/malloc.h> 67#include <sys/mutex.h> 68#include <sys/queue.h> 69#include <sys/systm.h> 70#include <sys/endian.h> 71 72#include <machine/stdarg.h> 73 74#include <dev/ofw/ofwvar.h> 75#include <dev/ofw/openfirm.h> 76 77#include "ofw_if.h" 78 79static void OF_putchar(int c, void *arg); 80 81MALLOC_DEFINE(M_OFWPROP, "openfirm", "Open Firmware properties"); 82 83static ihandle_t stdout; 84 85static ofw_def_t *ofw_def_impl = NULL; 86static ofw_t ofw_obj; 87static struct ofw_kobj ofw_kernel_obj; 88static struct kobj_ops ofw_kernel_kops; 89 90struct xrefinfo { 91 phandle_t xref; 92 phandle_t node; 93 device_t dev; 94 SLIST_ENTRY(xrefinfo) next_entry; 95}; 96 97static SLIST_HEAD(, xrefinfo) xreflist = SLIST_HEAD_INITIALIZER(xreflist); 98static struct mtx xreflist_lock; 99static boolean_t xref_init_done; 100 101#define FIND_BY_XREF 0 102#define FIND_BY_NODE 1 103#define FIND_BY_DEV 2 104 105/* 106 * xref-phandle-device lookup helper routines. 107 * 108 * As soon as we are able to use malloc(), walk the node tree and build a list 109 * of info that cross-references node handles, xref handles, and device_t 110 * instances. This list exists primarily to allow association of a device_t 111 * with an xref handle, but it is also used to speed up translation between xref 112 * and node handles. Before malloc() is available we have to recursively search 113 * the node tree each time we want to translate between a node and xref handle. 114 * Afterwards we can do the translations by searching this much shorter list. 115 */ 116static void 117xrefinfo_create(phandle_t node) 118{ 119 struct xrefinfo * xi; 120 phandle_t child, xref; 121 122 /* 123 * Recursively descend from parent, looking for nodes with a property 124 * named either "phandle", "ibm,phandle", or "linux,phandle". For each 125 * such node found create an entry in the xreflist. 126 */ 127 for (child = OF_child(node); child != 0; child = OF_peer(child)) { 128 xrefinfo_create(child); 129 if (OF_getencprop(child, "phandle", &xref, sizeof(xref)) == 130 -1 && OF_getencprop(child, "ibm,phandle", &xref, 131 sizeof(xref)) == -1 && OF_getencprop(child, 132 "linux,phandle", &xref, sizeof(xref)) == -1) 133 continue; 134 xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK | M_ZERO); 135 xi->node = child; 136 xi->xref = xref; 137 SLIST_INSERT_HEAD(&xreflist, xi, next_entry); 138 } 139} 140 141static void 142xrefinfo_init(void *unsed) 143{ 144 145 /* 146 * There is no locking during this init because it runs much earlier 147 * than any of the clients/consumers of the xref list data, but we do 148 * initialize the mutex that will be used for access later. 149 */ 150 mtx_init(&xreflist_lock, "OF xreflist lock", NULL, MTX_DEF); 151 xrefinfo_create(OF_peer(0)); 152 xref_init_done = true; 153} 154SYSINIT(xrefinfo, SI_SUB_KMEM, SI_ORDER_ANY, xrefinfo_init, NULL); 155 156static struct xrefinfo * 157xrefinfo_find(uintptr_t key, int find_by) 158{ 159 struct xrefinfo *rv, *xi; 160 161 rv = NULL; 162 mtx_lock(&xreflist_lock); 163 SLIST_FOREACH(xi, &xreflist, next_entry) { 164 if ((find_by == FIND_BY_XREF && (phandle_t)key == xi->xref) || 165 (find_by == FIND_BY_NODE && (phandle_t)key == xi->node) || 166 (find_by == FIND_BY_DEV && key == (uintptr_t)xi->dev)) { 167 rv = xi; 168 break; 169 } 170 } 171 mtx_unlock(&xreflist_lock); 172 return (rv); 173} 174 175static struct xrefinfo * 176xrefinfo_add(phandle_t node, phandle_t xref, device_t dev) 177{ 178 struct xrefinfo *xi; 179 180 xi = malloc(sizeof(*xi), M_OFWPROP, M_WAITOK); 181 xi->node = node; 182 xi->xref = xref; 183 xi->dev = dev; 184 mtx_lock(&xreflist_lock); 185 SLIST_INSERT_HEAD(&xreflist, xi, next_entry); 186 mtx_unlock(&xreflist_lock); 187 return (xi); 188} 189 190/* 191 * OFW install routines. Highest priority wins, equal priority also 192 * overrides allowing last-set to win. 193 */ 194SET_DECLARE(ofw_set, ofw_def_t); 195 196boolean_t 197OF_install(char *name, int prio) 198{ 199 ofw_def_t *ofwp, **ofwpp; 200 static int curr_prio = 0; 201 202 /* 203 * Try and locate the OFW kobj corresponding to the name. 204 */ 205 SET_FOREACH(ofwpp, ofw_set) { 206 ofwp = *ofwpp; 207 208 if (ofwp->name && 209 !strcmp(ofwp->name, name) && 210 prio >= curr_prio) { 211 curr_prio = prio; 212 ofw_def_impl = ofwp; 213 return (TRUE); 214 } 215 } 216 217 return (FALSE); 218} 219 220/* Initializer */ 221int 222OF_init(void *cookie) 223{ 224 phandle_t chosen; 225 int rv; 226 227 if (ofw_def_impl == NULL) 228 return (-1); 229 230 ofw_obj = &ofw_kernel_obj; 231 /* 232 * Take care of compiling the selected class, and 233 * then statically initialize the OFW object. 234 */ 235 kobj_class_compile_static(ofw_def_impl, &ofw_kernel_kops); 236 kobj_init_static((kobj_t)ofw_obj, ofw_def_impl); 237 238 rv = OFW_INIT(ofw_obj, cookie); 239 240 if ((chosen = OF_finddevice("/chosen")) != -1) 241 if (OF_getencprop(chosen, "stdout", &stdout, 242 sizeof(stdout)) == -1) 243 stdout = -1; 244 245 return (rv); 246} 247 248static void 249OF_putchar(int c, void *arg __unused) 250{ 251 char cbuf; 252 253 if (c == '\n') { 254 cbuf = '\r'; 255 OF_write(stdout, &cbuf, 1); 256 } 257 258 cbuf = c; 259 OF_write(stdout, &cbuf, 1); 260} 261 262void 263OF_printf(const char *fmt, ...) 264{ 265 va_list va; 266 267 va_start(va, fmt); 268 (void)kvprintf(fmt, OF_putchar, NULL, 10, va); 269 va_end(va); 270} 271 272/* 273 * Generic functions 274 */ 275 276/* Test to see if a service exists. */ 277int 278OF_test(const char *name) 279{ 280 281 if (ofw_def_impl == NULL) 282 return (-1); 283 284 return (OFW_TEST(ofw_obj, name)); 285} 286 287int 288OF_interpret(const char *cmd, int nreturns, ...) 289{ 290 va_list ap; 291 cell_t slots[16]; 292 int i = 0; 293 int status; 294 295 if (ofw_def_impl == NULL) 296 return (-1); 297 298 status = OFW_INTERPRET(ofw_obj, cmd, nreturns, slots); 299 if (status == -1) 300 return (status); 301 302 va_start(ap, nreturns); 303 while (i < nreturns) 304 *va_arg(ap, cell_t *) = slots[i++]; 305 va_end(ap); 306 307 return (status); 308} 309 310/* 311 * Device tree functions 312 */ 313 314/* Return the next sibling of this node or 0. */ 315phandle_t 316OF_peer(phandle_t node) 317{ 318 319 if (ofw_def_impl == NULL) 320 return (0); 321 322 return (OFW_PEER(ofw_obj, node)); 323} 324 325/* Return the first child of this node or 0. */ 326phandle_t 327OF_child(phandle_t node) 328{ 329 330 if (ofw_def_impl == NULL) 331 return (0); 332 333 return (OFW_CHILD(ofw_obj, node)); 334} 335 336/* Return the parent of this node or 0. */ 337phandle_t 338OF_parent(phandle_t node) 339{ 340 341 if (ofw_def_impl == NULL) 342 return (0); 343 344 return (OFW_PARENT(ofw_obj, node)); 345} 346 347/* Return the package handle that corresponds to an instance handle. */ 348phandle_t 349OF_instance_to_package(ihandle_t instance) 350{ 351 352 if (ofw_def_impl == NULL) 353 return (-1); 354 355 return (OFW_INSTANCE_TO_PACKAGE(ofw_obj, instance)); 356} 357 358/* Get the length of a property of a package. */ 359ssize_t 360OF_getproplen(phandle_t package, const char *propname) 361{ 362 363 if (ofw_def_impl == NULL) 364 return (-1); 365 366 return (OFW_GETPROPLEN(ofw_obj, package, propname)); 367} 368 369/* Check existence of a property of a package. */ 370int 371OF_hasprop(phandle_t package, const char *propname) 372{ 373 374 return (OF_getproplen(package, propname) >= 0 ? 1 : 0); 375} 376 377/* Get the value of a property of a package. */ 378ssize_t 379OF_getprop(phandle_t package, const char *propname, void *buf, size_t buflen) 380{ 381 382 if (ofw_def_impl == NULL) 383 return (-1); 384 385 return (OFW_GETPROP(ofw_obj, package, propname, buf, buflen)); 386} 387 388ssize_t 389OF_getencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len) 390{ 391 ssize_t retval; 392 int i; 393 394 KASSERT(len % 4 == 0, ("Need a multiple of 4 bytes")); 395 396 retval = OF_getprop(node, propname, buf, len); 397 for (i = 0; i < len/4; i++) 398 buf[i] = be32toh(buf[i]); 399 400 return (retval); 401} 402 403/* 404 * Recursively search the node and its parent for the given property, working 405 * downward from the node to the device tree root. Returns the value of the 406 * first match. 407 */ 408ssize_t 409OF_searchprop(phandle_t node, const char *propname, void *buf, size_t len) 410{ 411 ssize_t rv; 412 413 for (; node != 0; node = OF_parent(node)) 414 if ((rv = OF_getprop(node, propname, buf, len)) != -1) 415 return (rv); 416 return (-1); 417} 418 419ssize_t 420OF_searchencprop(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_getencprop(node, propname, buf, len)) != -1) 426 return (rv); 427 return (-1); 428} 429 430/* 431 * Store the value of a property of a package into newly allocated memory 432 * (using the M_OFWPROP malloc pool and M_WAITOK). elsz is the size of a 433 * single element, the number of elements is return in number. 434 */ 435ssize_t 436OF_getprop_alloc(phandle_t package, const char *propname, int elsz, void **buf) 437{ 438 int len; 439 440 *buf = NULL; 441 if ((len = OF_getproplen(package, propname)) == -1 || 442 len % elsz != 0) 443 return (-1); 444 445 *buf = malloc(len, M_OFWPROP, M_WAITOK); 446 if (OF_getprop(package, propname, *buf, len) == -1) { 447 free(*buf, M_OFWPROP); 448 *buf = NULL; 449 return (-1); 450 } 451 return (len / elsz); 452} 453 454ssize_t 455OF_getencprop_alloc(phandle_t package, const char *name, int elsz, void **buf) 456{ 457 ssize_t retval; 458 pcell_t *cell; 459 int i; 460 461 retval = OF_getprop_alloc(package, name, elsz, buf); 462 if (retval == -1) 463 return (-1); 464 if (retval * elsz % 4 != 0) { 465 free(*buf, M_OFWPROP); 466 *buf = NULL; 467 return (-1); 468 } 469 470 cell = *buf; 471 for (i = 0; i < retval * elsz / 4; i++) 472 cell[i] = be32toh(cell[i]); 473 474 return (retval); 475} 476 477/* Get the next property of a package. */ 478int 479OF_nextprop(phandle_t package, const char *previous, char *buf, size_t size) 480{ 481 482 if (ofw_def_impl == NULL) 483 return (-1); 484 485 return (OFW_NEXTPROP(ofw_obj, package, previous, buf, size)); 486} 487 488/* Set the value of a property of a package. */ 489int 490OF_setprop(phandle_t package, const char *propname, const void *buf, size_t len) 491{ 492 493 if (ofw_def_impl == NULL) 494 return (-1); 495 496 return (OFW_SETPROP(ofw_obj, package, propname, buf,len)); 497} 498 499/* Convert a device specifier to a fully qualified pathname. */ 500ssize_t 501OF_canon(const char *device, char *buf, size_t len) 502{ 503 504 if (ofw_def_impl == NULL) 505 return (-1); 506 507 return (OFW_CANON(ofw_obj, device, buf, len)); 508} 509 510/* Return a package handle for the specified device. */ 511phandle_t 512OF_finddevice(const char *device) 513{ 514 515 if (ofw_def_impl == NULL) 516 return (-1); 517 518 return (OFW_FINDDEVICE(ofw_obj, device)); 519} 520 521/* Return the fully qualified pathname corresponding to an instance. */ 522ssize_t 523OF_instance_to_path(ihandle_t instance, char *buf, size_t len) 524{ 525 526 if (ofw_def_impl == NULL) 527 return (-1); 528 529 return (OFW_INSTANCE_TO_PATH(ofw_obj, instance, buf, len)); 530} 531 532/* Return the fully qualified pathname corresponding to a package. */ 533ssize_t 534OF_package_to_path(phandle_t package, char *buf, size_t len) 535{ 536 537 if (ofw_def_impl == NULL) 538 return (-1); 539 540 return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len)); 541} 542 543/* Look up effective phandle (see FDT/PAPR spec) */ 544static phandle_t 545OF_child_xref_phandle(phandle_t parent, phandle_t xref) 546{ 547 phandle_t child, rxref; 548 549 /* 550 * Recursively descend from parent, looking for a node with a property 551 * named either "phandle", "ibm,phandle", or "linux,phandle" that 552 * matches the xref we are looking for. 553 */ 554 555 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 556 rxref = OF_child_xref_phandle(child, xref); 557 if (rxref != -1) 558 return (rxref); 559 560 if (OF_getencprop(child, "phandle", &rxref, sizeof(rxref)) == 561 -1 && OF_getencprop(child, "ibm,phandle", &rxref, 562 sizeof(rxref)) == -1 && OF_getencprop(child, 563 "linux,phandle", &rxref, sizeof(rxref)) == -1) 564 continue; 565 566 if (rxref == xref) 567 return (child); 568 } 569 570 return (-1); 571} 572 573phandle_t 574OF_node_from_xref(phandle_t xref) 575{ 576 struct xrefinfo *xi; 577 phandle_t node; 578 579 if (xref_init_done) { 580 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 581 return (xref); 582 return (xi->node); 583 } 584 585 if ((node = OF_child_xref_phandle(OF_peer(0), xref)) == -1) 586 return (xref); 587 return (node); 588} 589 590phandle_t 591OF_xref_from_node(phandle_t node) 592{ 593 struct xrefinfo *xi; 594 phandle_t xref; 595 596 if (xref_init_done) { 597 if ((xi = xrefinfo_find(node, FIND_BY_NODE)) == NULL) 598 return (node); 599 return (xi->xref); 600 } 601 602 if (OF_getencprop(node, "phandle", &xref, sizeof(xref)) == 603 -1 && OF_getencprop(node, "ibm,phandle", &xref, 604 sizeof(xref)) == -1 && OF_getencprop(node, 605 "linux,phandle", &xref, sizeof(xref)) == -1) 606 return (node); 607 return (xref); 608} 609 610device_t 611OF_device_from_xref(phandle_t xref) 612{ 613 struct xrefinfo *xi; 614 615 if (xref_init_done) { 616 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 617 return (NULL); 618 return (xi->dev); 619 } 620 panic("Attempt to find device before xreflist_init"); 621} 622 623phandle_t 624OF_xref_from_device(device_t dev) 625{ 626 struct xrefinfo *xi; 627 628 if (xref_init_done) { 629 if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL) 630 return (0); 631 return (xi->xref); 632 } 633 panic("Attempt to find xref before xreflist_init"); 634} 635 636int 637OF_device_register_xref(phandle_t xref, device_t dev) 638{ 639 struct xrefinfo *xi; 640 641 /* 642 * If the given xref handle doesn't already exist in the list then we 643 * add a list entry. In theory this can only happen on a system where 644 * nodes don't contain phandle properties and xref and node handles are 645 * synonymous, so the xref handle is added as the node handle as well. 646 */ 647 if (xref_init_done) { 648 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 649 xrefinfo_add(xref, xref, dev); 650 else 651 xi->dev = dev; 652 return (0); 653 } 654 panic("Attempt to register device before xreflist_init"); 655} 656 657/* Call the method in the scope of a given instance. */ 658int 659OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns, 660 ...) 661{ 662 va_list ap; 663 cell_t args_n_results[12]; 664 int n, status; 665 666 if (nargs > 6 || ofw_def_impl == NULL) 667 return (-1); 668 va_start(ap, nreturns); 669 for (n = 0; n < nargs; n++) 670 args_n_results[n] = va_arg(ap, cell_t); 671 672 status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns, 673 args_n_results); 674 if (status != 0) 675 return (status); 676 677 for (; n < nargs + nreturns; n++) 678 *va_arg(ap, cell_t *) = args_n_results[n]; 679 va_end(ap); 680 return (0); 681} 682 683/* 684 * Device I/O functions 685 */ 686 687/* Open an instance for a device. */ 688ihandle_t 689OF_open(const char *device) 690{ 691 692 if (ofw_def_impl == NULL) 693 return (0); 694 695 return (OFW_OPEN(ofw_obj, device)); 696} 697 698/* Close an instance. */ 699void 700OF_close(ihandle_t instance) 701{ 702 703 if (ofw_def_impl == NULL) 704 return; 705 706 OFW_CLOSE(ofw_obj, instance); 707} 708 709/* Read from an instance. */ 710ssize_t 711OF_read(ihandle_t instance, void *addr, size_t len) 712{ 713 714 if (ofw_def_impl == NULL) 715 return (-1); 716 717 return (OFW_READ(ofw_obj, instance, addr, len)); 718} 719 720/* Write to an instance. */ 721ssize_t 722OF_write(ihandle_t instance, const void *addr, size_t len) 723{ 724 725 if (ofw_def_impl == NULL) 726 return (-1); 727 728 return (OFW_WRITE(ofw_obj, instance, addr, len)); 729} 730 731/* Seek to a position. */ 732int 733OF_seek(ihandle_t instance, uint64_t pos) 734{ 735 736 if (ofw_def_impl == NULL) 737 return (-1); 738 739 return (OFW_SEEK(ofw_obj, instance, pos)); 740} 741 742/* 743 * Memory functions 744 */ 745 746/* Claim an area of memory. */ 747void * 748OF_claim(void *virt, size_t size, u_int align) 749{ 750 751 if (ofw_def_impl == NULL) 752 return ((void *)-1); 753 754 return (OFW_CLAIM(ofw_obj, virt, size, align)); 755} 756 757/* Release an area of memory. */ 758void 759OF_release(void *virt, size_t size) 760{ 761 762 if (ofw_def_impl == NULL) 763 return; 764 765 OFW_RELEASE(ofw_obj, virt, size); 766} 767 768/* 769 * Control transfer functions 770 */ 771 772/* Suspend and drop back to the Open Firmware interface. */ 773void 774OF_enter() 775{ 776 777 if (ofw_def_impl == NULL) 778 return; 779 780 OFW_ENTER(ofw_obj); 781} 782 783/* Shut down and drop back to the Open Firmware interface. */ 784void 785OF_exit() 786{ 787 788 if (ofw_def_impl == NULL) 789 panic("OF_exit: Open Firmware not available"); 790 791 /* Should not return */ 792 OFW_EXIT(ofw_obj); 793 794 for (;;) /* just in case */ 795 ; 796} 797