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("$FreeBSD$");
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
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 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 */
116 static void
xrefinfo_create(phandle_t node)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
xrefinfo_init(void * unsed)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 *
xrefinfo_find(uintptr_t key,int find_by)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 *
xrefinfo_add(phandle_t node,phandle_t xref,device_t dev)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 boolean_t
OF_install(char * name,int prio)197 OF_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 */
221 int
OF_init(void * cookie)222 OF_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
248 static void
OF_putchar(int c,void * arg __unused)249 OF_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
262 void
OF_printf(const char * fmt,...)263 OF_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. */
277 int
OF_test(const char * name)278 OF_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
287 int
OF_interpret(const char * cmd,int nreturns,...)288 OF_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. */
315 phandle_t
OF_peer(phandle_t node)316 OF_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. */
326 phandle_t
OF_child(phandle_t node)327 OF_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. */
337 phandle_t
OF_parent(phandle_t node)338 OF_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. */
348 phandle_t
OF_instance_to_package(ihandle_t instance)349 OF_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. */
359 ssize_t
OF_getproplen(phandle_t package,const char * propname)360 OF_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. */
370 int
OF_hasprop(phandle_t package,const char * propname)371 OF_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. */
378 ssize_t
OF_getprop(phandle_t package,const char * propname,void * buf,size_t buflen)379 OF_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
388 ssize_t
OF_getencprop(phandle_t node,const char * propname,pcell_t * buf,size_t len)389 OF_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 */
408 ssize_t
OF_searchprop(phandle_t node,const char * propname,void * buf,size_t len)409 OF_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
419 ssize_t
OF_searchencprop(phandle_t node,const char * propname,void * buf,size_t len)420 OF_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 */
435 ssize_t
OF_getprop_alloc(phandle_t package,const char * propname,int elsz,void ** buf)436 OF_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
454 ssize_t
OF_getencprop_alloc(phandle_t package,const char * name,int elsz,void ** buf)455 OF_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. */
478 int
OF_nextprop(phandle_t package,const char * previous,char * buf,size_t size)479 OF_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. */
489 int
OF_setprop(phandle_t package,const char * propname,const void * buf,size_t len)490 OF_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. */
500 ssize_t
OF_canon(const char * device,char * buf,size_t len)501 OF_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. */
511 phandle_t
OF_finddevice(const char * device)512 OF_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. */
522 ssize_t
OF_instance_to_path(ihandle_t instance,char * buf,size_t len)523 OF_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. */
533 ssize_t
OF_package_to_path(phandle_t package,char * buf,size_t len)534 OF_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) */
544 static phandle_t
OF_child_xref_phandle(phandle_t parent,phandle_t xref)545 OF_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
573 phandle_t
OF_node_from_xref(phandle_t xref)574 OF_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
590 phandle_t
OF_xref_from_node(phandle_t node)591 OF_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
610 device_t
OF_device_from_xref(phandle_t xref)611 OF_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
623 phandle_t
OF_xref_from_device(device_t dev)624 OF_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
636 int
OF_device_register_xref(phandle_t xref,device_t dev)637 OF_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. */
658 int
OF_call_method(const char * method,ihandle_t instance,int nargs,int nreturns,...)659 OF_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. */
688 ihandle_t
OF_open(const char * device)689 OF_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. */
699 void
OF_close(ihandle_t instance)700 OF_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. */
710 ssize_t
OF_read(ihandle_t instance,void * addr,size_t len)711 OF_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. */
721 ssize_t
OF_write(ihandle_t instance,const void * addr,size_t len)722 OF_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. */
732 int
OF_seek(ihandle_t instance,uint64_t pos)733 OF_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. */
747 void *
OF_claim(void * virt,size_t size,u_int align)748 OF_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. */
758 void
OF_release(void * virt,size_t size)759 OF_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. */
773 void
OF_enter()774 OF_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. */
784 void
OF_exit()785 OF_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