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 #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 79 static void OF_putchar(int c, void *arg); 80 81 MALLOC_DEFINE(M_OFWPROP, "openfirm", "Open Firmware properties"); 82 83 static ihandle_t stdout; 84 85 static ofw_def_t *ofw_def_impl = NULL; 86 static ofw_t ofw_obj; 87 static struct ofw_kobj ofw_kernel_obj; 88 static struct kobj_ops ofw_kernel_kops; 89 90 struct xrefinfo { 91 phandle_t xref; 92 phandle_t node; 93 device_t dev; 94 SLIST_ENTRY(xrefinfo) next_entry; 95 }; 96 97 static SLIST_HEAD(, xrefinfo) xreflist = SLIST_HEAD_INITIALIZER(xreflist); 98 static struct mtx xreflist_lock; 99 static bool 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 */ 116 static void 117 xrefinfo_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 } 140 141 static void 142 xrefinfo_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 } 154 SYSINIT(xrefinfo, SI_SUB_KMEM, SI_ORDER_ANY, xrefinfo_init, NULL); 155 156 static struct xrefinfo * 157 xrefinfo_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 } 174 175 static struct xrefinfo * 176 xrefinfo_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 */ 194 SET_DECLARE(ofw_set, ofw_def_t); 195 196 bool 197 OF_install(char *name, int prio) 198 { 199 ofw_def_t *ofwp, **ofwpp; 200 static int curr_prio = 0; 201 202 /* Allow OF layer to be uninstalled */ 203 if (name == NULL) { 204 ofw_def_impl = NULL; 205 return (false); 206 } 207 208 /* 209 * Try and locate the OFW kobj corresponding to the name. 210 */ 211 SET_FOREACH(ofwpp, ofw_set) { 212 ofwp = *ofwpp; 213 214 if (ofwp->name && 215 !strcmp(ofwp->name, name) && 216 prio >= curr_prio) { 217 curr_prio = prio; 218 ofw_def_impl = ofwp; 219 return (true); 220 } 221 } 222 223 return (false); 224 } 225 226 /* Initializer */ 227 int 228 OF_init(void *cookie) 229 { 230 phandle_t chosen; 231 int rv; 232 233 if (ofw_def_impl == NULL) 234 return (-1); 235 236 ofw_obj = &ofw_kernel_obj; 237 /* 238 * Take care of compiling the selected class, and 239 * then statically initialize the OFW object. 240 */ 241 kobj_class_compile_static(ofw_def_impl, &ofw_kernel_kops); 242 kobj_init_static((kobj_t)ofw_obj, ofw_def_impl); 243 244 rv = OFW_INIT(ofw_obj, cookie); 245 246 if ((chosen = OF_finddevice("/chosen")) != -1) 247 if (OF_getencprop(chosen, "stdout", &stdout, 248 sizeof(stdout)) == -1) 249 stdout = -1; 250 251 return (rv); 252 } 253 254 static void 255 OF_putchar(int c, void *arg __unused) 256 { 257 char cbuf; 258 259 if (c == '\n') { 260 cbuf = '\r'; 261 OF_write(stdout, &cbuf, 1); 262 } 263 264 cbuf = c; 265 OF_write(stdout, &cbuf, 1); 266 } 267 268 void 269 OF_printf(const char *fmt, ...) 270 { 271 va_list va; 272 273 va_start(va, fmt); 274 (void)kvprintf(fmt, OF_putchar, NULL, 10, va); 275 va_end(va); 276 } 277 278 /* 279 * Generic functions 280 */ 281 282 /* Test to see if a service exists. */ 283 int 284 OF_test(const char *name) 285 { 286 287 if (ofw_def_impl == NULL) 288 return (-1); 289 290 return (OFW_TEST(ofw_obj, name)); 291 } 292 293 int 294 OF_interpret(const char *cmd, int nreturns, ...) 295 { 296 va_list ap; 297 cell_t slots[16]; 298 int i = 0; 299 int status; 300 301 if (ofw_def_impl == NULL) 302 return (-1); 303 304 status = OFW_INTERPRET(ofw_obj, cmd, nreturns, slots); 305 if (status == -1) 306 return (status); 307 308 va_start(ap, nreturns); 309 while (i < nreturns) 310 *va_arg(ap, cell_t *) = slots[i++]; 311 va_end(ap); 312 313 return (status); 314 } 315 316 /* 317 * Device tree functions 318 */ 319 320 /* Return the next sibling of this node or 0. */ 321 phandle_t 322 OF_peer(phandle_t node) 323 { 324 325 if (ofw_def_impl == NULL) 326 return (0); 327 328 return (OFW_PEER(ofw_obj, node)); 329 } 330 331 /* Return the first child of this node or 0. */ 332 phandle_t 333 OF_child(phandle_t node) 334 { 335 336 if (ofw_def_impl == NULL) 337 return (0); 338 339 return (OFW_CHILD(ofw_obj, node)); 340 } 341 342 /* Return the parent of this node or 0. */ 343 phandle_t 344 OF_parent(phandle_t node) 345 { 346 347 if (ofw_def_impl == NULL) 348 return (0); 349 350 return (OFW_PARENT(ofw_obj, node)); 351 } 352 353 /* Return the package handle that corresponds to an instance handle. */ 354 phandle_t 355 OF_instance_to_package(ihandle_t instance) 356 { 357 358 if (ofw_def_impl == NULL) 359 return (-1); 360 361 return (OFW_INSTANCE_TO_PACKAGE(ofw_obj, instance)); 362 } 363 364 /* Get the length of a property of a package. */ 365 ssize_t 366 OF_getproplen(phandle_t package, const char *propname) 367 { 368 369 if (ofw_def_impl == NULL) 370 return (-1); 371 372 return (OFW_GETPROPLEN(ofw_obj, package, propname)); 373 } 374 375 /* Check existence of a property of a package. */ 376 int 377 OF_hasprop(phandle_t package, const char *propname) 378 { 379 380 return (OF_getproplen(package, propname) >= 0 ? 1 : 0); 381 } 382 383 /* Get the value of a property of a package. */ 384 ssize_t 385 OF_getprop(phandle_t package, const char *propname, void *buf, size_t buflen) 386 { 387 388 if (ofw_def_impl == NULL) 389 return (-1); 390 391 return (OFW_GETPROP(ofw_obj, package, propname, buf, buflen)); 392 } 393 394 ssize_t 395 OF_getencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len) 396 { 397 ssize_t retval; 398 int i; 399 400 KASSERT(len % 4 == 0, ("Need a multiple of 4 bytes")); 401 402 retval = OF_getprop(node, propname, buf, len); 403 if (retval <= 0) 404 return (retval); 405 406 for (i = 0; i < len/4; i++) 407 buf[i] = be32toh(buf[i]); 408 409 return (retval); 410 } 411 412 /* 413 * Recursively search the node and its parent for the given property, working 414 * downward from the node to the device tree root. Returns the value of the 415 * first match. 416 */ 417 ssize_t 418 OF_searchprop(phandle_t node, const char *propname, void *buf, size_t len) 419 { 420 ssize_t rv; 421 422 for (; node != 0; node = OF_parent(node)) 423 if ((rv = OF_getprop(node, propname, buf, len)) != -1) 424 return (rv); 425 return (-1); 426 } 427 428 ssize_t 429 OF_searchencprop(phandle_t node, const char *propname, pcell_t *buf, size_t len) 430 { 431 ssize_t rv; 432 433 for (; node != 0; node = OF_parent(node)) 434 if ((rv = OF_getencprop(node, propname, buf, len)) != -1) 435 return (rv); 436 return (-1); 437 } 438 439 /* 440 * Store the value of a property of a package into newly allocated memory 441 * (using the M_OFWPROP malloc pool and M_WAITOK). 442 */ 443 ssize_t 444 OF_getprop_alloc(phandle_t package, const char *propname, void **buf) 445 { 446 int len; 447 448 *buf = NULL; 449 if ((len = OF_getproplen(package, propname)) == -1) 450 return (-1); 451 452 if (len > 0) { 453 *buf = malloc(len, M_OFWPROP, M_WAITOK); 454 if (OF_getprop(package, propname, *buf, len) == -1) { 455 free(*buf, M_OFWPROP); 456 *buf = NULL; 457 return (-1); 458 } 459 } 460 return (len); 461 } 462 463 /* 464 * Store the value of a property of a package into newly allocated memory 465 * (using the M_OFWPROP malloc pool and M_WAITOK). elsz is the size of a 466 * single element, the number of elements is return in number. 467 */ 468 ssize_t 469 OF_getprop_alloc_multi(phandle_t package, const char *propname, int elsz, void **buf) 470 { 471 int len; 472 473 *buf = NULL; 474 if ((len = OF_getproplen(package, propname)) == -1 || 475 len % elsz != 0) 476 return (-1); 477 478 if (len > 0) { 479 *buf = malloc(len, M_OFWPROP, M_WAITOK); 480 if (OF_getprop(package, propname, *buf, len) == -1) { 481 free(*buf, M_OFWPROP); 482 *buf = NULL; 483 return (-1); 484 } 485 } 486 return (len / elsz); 487 } 488 489 ssize_t 490 OF_getencprop_alloc(phandle_t package, const char *name, void **buf) 491 { 492 ssize_t ret; 493 494 ret = OF_getencprop_alloc_multi(package, name, sizeof(pcell_t), 495 buf); 496 if (ret < 0) 497 return (ret); 498 else 499 return (ret * sizeof(pcell_t)); 500 } 501 502 ssize_t 503 OF_getencprop_alloc_multi(phandle_t package, const char *name, int elsz, 504 void **buf) 505 { 506 ssize_t retval; 507 pcell_t *cell; 508 int i; 509 510 retval = OF_getprop_alloc_multi(package, name, elsz, buf); 511 if (retval == -1) 512 return (-1); 513 514 cell = *buf; 515 for (i = 0; i < retval * elsz / 4; i++) 516 cell[i] = be32toh(cell[i]); 517 518 return (retval); 519 } 520 521 /* Free buffer allocated by OF_getencprop_alloc or OF_getprop_alloc */ 522 void OF_prop_free(void *buf) 523 { 524 525 free(buf, M_OFWPROP); 526 } 527 528 /* Get the next property of a package. */ 529 int 530 OF_nextprop(phandle_t package, const char *previous, char *buf, size_t size) 531 { 532 533 if (ofw_def_impl == NULL) 534 return (-1); 535 536 return (OFW_NEXTPROP(ofw_obj, package, previous, buf, size)); 537 } 538 539 /* Set the value of a property of a package. */ 540 int 541 OF_setprop(phandle_t package, const char *propname, const void *buf, size_t len) 542 { 543 544 if (ofw_def_impl == NULL) 545 return (-1); 546 547 return (OFW_SETPROP(ofw_obj, package, propname, buf,len)); 548 } 549 550 /* Convert a device specifier to a fully qualified pathname. */ 551 ssize_t 552 OF_canon(const char *device, char *buf, size_t len) 553 { 554 555 if (ofw_def_impl == NULL) 556 return (-1); 557 558 return (OFW_CANON(ofw_obj, device, buf, len)); 559 } 560 561 /* Return a package handle for the specified device. */ 562 phandle_t 563 OF_finddevice(const char *device) 564 { 565 566 if (ofw_def_impl == NULL) 567 return (-1); 568 569 return (OFW_FINDDEVICE(ofw_obj, device)); 570 } 571 572 /* Return the fully qualified pathname corresponding to an instance. */ 573 ssize_t 574 OF_instance_to_path(ihandle_t instance, char *buf, size_t len) 575 { 576 577 if (ofw_def_impl == NULL) 578 return (-1); 579 580 return (OFW_INSTANCE_TO_PATH(ofw_obj, instance, buf, len)); 581 } 582 583 /* Return the fully qualified pathname corresponding to a package. */ 584 ssize_t 585 OF_package_to_path(phandle_t package, char *buf, size_t len) 586 { 587 588 if (ofw_def_impl == NULL) 589 return (-1); 590 591 return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len)); 592 } 593 594 /* Look up effective phandle (see FDT/PAPR spec) */ 595 static phandle_t 596 OF_child_xref_phandle(phandle_t parent, phandle_t xref) 597 { 598 phandle_t child, rxref; 599 600 /* 601 * Recursively descend from parent, looking for a node with a property 602 * named either "phandle", "ibm,phandle", or "linux,phandle" that 603 * matches the xref we are looking for. 604 */ 605 606 for (child = OF_child(parent); child != 0; child = OF_peer(child)) { 607 rxref = OF_child_xref_phandle(child, xref); 608 if (rxref != -1) 609 return (rxref); 610 611 if (OF_getencprop(child, "phandle", &rxref, sizeof(rxref)) == 612 -1 && OF_getencprop(child, "ibm,phandle", &rxref, 613 sizeof(rxref)) == -1 && OF_getencprop(child, 614 "linux,phandle", &rxref, sizeof(rxref)) == -1) 615 continue; 616 617 if (rxref == xref) 618 return (child); 619 } 620 621 return (-1); 622 } 623 624 phandle_t 625 OF_node_from_xref(phandle_t xref) 626 { 627 struct xrefinfo *xi; 628 phandle_t node; 629 630 if (xref_init_done) { 631 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 632 return (xref); 633 return (xi->node); 634 } 635 636 if ((node = OF_child_xref_phandle(OF_peer(0), xref)) == -1) 637 return (xref); 638 return (node); 639 } 640 641 phandle_t 642 OF_xref_from_node(phandle_t node) 643 { 644 struct xrefinfo *xi; 645 phandle_t xref; 646 647 if (xref_init_done) { 648 if ((xi = xrefinfo_find(node, FIND_BY_NODE)) == NULL) 649 return (node); 650 return (xi->xref); 651 } 652 653 if (OF_getencprop(node, "phandle", &xref, sizeof(xref)) == -1 && 654 OF_getencprop(node, "ibm,phandle", &xref, sizeof(xref)) == -1 && 655 OF_getencprop(node, "linux,phandle", &xref, sizeof(xref)) == -1) 656 return (node); 657 return (xref); 658 } 659 660 device_t 661 OF_device_from_xref(phandle_t xref) 662 { 663 struct xrefinfo *xi; 664 665 if (xref_init_done) { 666 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 667 return (NULL); 668 return (xi->dev); 669 } 670 panic("Attempt to find device before xreflist_init"); 671 } 672 673 phandle_t 674 OF_xref_from_device(device_t dev) 675 { 676 struct xrefinfo *xi; 677 678 if (xref_init_done) { 679 if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL) 680 return (0); 681 return (xi->xref); 682 } 683 panic("Attempt to find xref before xreflist_init"); 684 } 685 686 int 687 OF_device_register_xref(phandle_t xref, device_t dev) 688 { 689 struct xrefinfo *xi; 690 691 /* 692 * If the given xref handle doesn't already exist in the list then we 693 * add a list entry. In theory this can only happen on a system where 694 * nodes don't contain phandle properties and xref and node handles are 695 * synonymous, so the xref handle is added as the node handle as well. 696 */ 697 if (xref_init_done) { 698 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL) 699 xrefinfo_add(xref, xref, dev); 700 else 701 xi->dev = dev; 702 return (0); 703 } 704 panic("Attempt to register device before xreflist_init"); 705 } 706 707 /* Call the method in the scope of a given instance. */ 708 int 709 OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns, 710 ...) 711 { 712 va_list ap; 713 cell_t args_n_results[12]; 714 int n, status; 715 716 if (nargs > 6 || ofw_def_impl == NULL) 717 return (-1); 718 va_start(ap, nreturns); 719 for (n = 0; n < nargs; n++) 720 args_n_results[n] = va_arg(ap, cell_t); 721 722 status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns, 723 args_n_results); 724 if (status != 0) 725 return (status); 726 727 for (; n < nargs + nreturns; n++) 728 *va_arg(ap, cell_t *) = args_n_results[n]; 729 va_end(ap); 730 return (0); 731 } 732 733 /* 734 * Device I/O functions 735 */ 736 737 /* Open an instance for a device. */ 738 ihandle_t 739 OF_open(const char *device) 740 { 741 742 if (ofw_def_impl == NULL) 743 return (0); 744 745 return (OFW_OPEN(ofw_obj, device)); 746 } 747 748 /* Close an instance. */ 749 void 750 OF_close(ihandle_t instance) 751 { 752 753 if (ofw_def_impl == NULL) 754 return; 755 756 OFW_CLOSE(ofw_obj, instance); 757 } 758 759 /* Read from an instance. */ 760 ssize_t 761 OF_read(ihandle_t instance, void *addr, size_t len) 762 { 763 764 if (ofw_def_impl == NULL) 765 return (-1); 766 767 return (OFW_READ(ofw_obj, instance, addr, len)); 768 } 769 770 /* Write to an instance. */ 771 ssize_t 772 OF_write(ihandle_t instance, const void *addr, size_t len) 773 { 774 775 if (ofw_def_impl == NULL) 776 return (-1); 777 778 return (OFW_WRITE(ofw_obj, instance, addr, len)); 779 } 780 781 /* Seek to a position. */ 782 int 783 OF_seek(ihandle_t instance, uint64_t pos) 784 { 785 786 if (ofw_def_impl == NULL) 787 return (-1); 788 789 return (OFW_SEEK(ofw_obj, instance, pos)); 790 } 791 792 /* 793 * Memory functions 794 */ 795 796 /* Claim an area of memory. */ 797 void * 798 OF_claim(void *virt, size_t size, u_int align) 799 { 800 801 if (ofw_def_impl == NULL) 802 return ((void *)-1); 803 804 return (OFW_CLAIM(ofw_obj, virt, size, align)); 805 } 806 807 /* Release an area of memory. */ 808 void 809 OF_release(void *virt, size_t size) 810 { 811 812 if (ofw_def_impl == NULL) 813 return; 814 815 OFW_RELEASE(ofw_obj, virt, size); 816 } 817 818 /* 819 * Control transfer functions 820 */ 821 822 /* Suspend and drop back to the Open Firmware interface. */ 823 void 824 OF_enter(void) 825 { 826 827 if (ofw_def_impl == NULL) 828 return; 829 830 OFW_ENTER(ofw_obj); 831 } 832 833 /* Shut down and drop back to the Open Firmware interface. */ 834 void 835 OF_exit(void) 836 { 837 838 if (ofw_def_impl == NULL) 839 panic("OF_exit: Open Firmware not available"); 840 841 /* Should not return */ 842 OFW_EXIT(ofw_obj); 843 844 for (;;) /* just in case */ 845 ; 846 } 847