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 /* 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
OF_init(void * cookie)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
OF_putchar(int c,void * arg __unused)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
OF_printf(const char * fmt,...)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
OF_test(const char * name)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
OF_interpret(const char * cmd,int nreturns,...)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
OF_peer(phandle_t node)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
OF_child(phandle_t node)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
OF_parent(phandle_t node)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
OF_instance_to_package(ihandle_t instance)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
OF_getproplen(phandle_t package,const char * propname)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
OF_hasprop(phandle_t package,const char * propname)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
OF_getprop(phandle_t package,const char * propname,void * buf,size_t buflen)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
OF_getencprop(phandle_t node,const char * propname,pcell_t * buf,size_t len)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
OF_searchprop(phandle_t node,const char * propname,void * buf,size_t len)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
OF_searchencprop(phandle_t node,const char * propname,void * buf,size_t len)429 OF_searchencprop(phandle_t node, const char *propname, void *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). elsz is the size of a
442 * single element, the number of elements is return in number.
443 */
444 ssize_t
OF_getprop_alloc(phandle_t package,const char * propname,int elsz,void ** buf)445 OF_getprop_alloc(phandle_t package, const char *propname, int elsz, void **buf)
446 {
447 int len;
448
449 *buf = NULL;
450 if ((len = OF_getproplen(package, propname)) == -1 ||
451 len % elsz != 0)
452 return (-1);
453
454 *buf = malloc(len, M_OFWPROP, M_WAITOK);
455 if (OF_getprop(package, propname, *buf, len) == -1) {
456 free(*buf, M_OFWPROP);
457 *buf = NULL;
458 return (-1);
459 }
460 return (len / elsz);
461 }
462
463 ssize_t
OF_getencprop_alloc(phandle_t package,const char * name,int elsz,void ** buf)464 OF_getencprop_alloc(phandle_t package, const char *name, int elsz, void **buf)
465 {
466 ssize_t retval;
467 pcell_t *cell;
468 int i;
469
470 retval = OF_getprop_alloc(package, name, elsz, buf);
471 if (retval == -1)
472 return (-1);
473 if (retval * elsz % 4 != 0) {
474 free(*buf, M_OFWPROP);
475 *buf = NULL;
476 return (-1);
477 }
478
479 cell = *buf;
480 for (i = 0; i < retval * elsz / 4; i++)
481 cell[i] = be32toh(cell[i]);
482
483 return (retval);
484 }
485
486 /* Free buffer allocated by OF_getencprop_alloc or OF_getprop_alloc */
OF_prop_free(void * buf)487 void OF_prop_free(void *buf)
488 {
489
490 free(buf, M_OFWPROP);
491 }
492
493 /* Get the next property of a package. */
494 int
OF_nextprop(phandle_t package,const char * previous,char * buf,size_t size)495 OF_nextprop(phandle_t package, const char *previous, char *buf, size_t size)
496 {
497
498 if (ofw_def_impl == NULL)
499 return (-1);
500
501 return (OFW_NEXTPROP(ofw_obj, package, previous, buf, size));
502 }
503
504 /* Set the value of a property of a package. */
505 int
OF_setprop(phandle_t package,const char * propname,const void * buf,size_t len)506 OF_setprop(phandle_t package, const char *propname, const void *buf, size_t len)
507 {
508
509 if (ofw_def_impl == NULL)
510 return (-1);
511
512 return (OFW_SETPROP(ofw_obj, package, propname, buf,len));
513 }
514
515 /* Convert a device specifier to a fully qualified pathname. */
516 ssize_t
OF_canon(const char * device,char * buf,size_t len)517 OF_canon(const char *device, char *buf, size_t len)
518 {
519
520 if (ofw_def_impl == NULL)
521 return (-1);
522
523 return (OFW_CANON(ofw_obj, device, buf, len));
524 }
525
526 /* Return a package handle for the specified device. */
527 phandle_t
OF_finddevice(const char * device)528 OF_finddevice(const char *device)
529 {
530
531 if (ofw_def_impl == NULL)
532 return (-1);
533
534 return (OFW_FINDDEVICE(ofw_obj, device));
535 }
536
537 /* Return the fully qualified pathname corresponding to an instance. */
538 ssize_t
OF_instance_to_path(ihandle_t instance,char * buf,size_t len)539 OF_instance_to_path(ihandle_t instance, char *buf, size_t len)
540 {
541
542 if (ofw_def_impl == NULL)
543 return (-1);
544
545 return (OFW_INSTANCE_TO_PATH(ofw_obj, instance, buf, len));
546 }
547
548 /* Return the fully qualified pathname corresponding to a package. */
549 ssize_t
OF_package_to_path(phandle_t package,char * buf,size_t len)550 OF_package_to_path(phandle_t package, char *buf, size_t len)
551 {
552
553 if (ofw_def_impl == NULL)
554 return (-1);
555
556 return (OFW_PACKAGE_TO_PATH(ofw_obj, package, buf, len));
557 }
558
559 /* Look up effective phandle (see FDT/PAPR spec) */
560 static phandle_t
OF_child_xref_phandle(phandle_t parent,phandle_t xref)561 OF_child_xref_phandle(phandle_t parent, phandle_t xref)
562 {
563 phandle_t child, rxref;
564
565 /*
566 * Recursively descend from parent, looking for a node with a property
567 * named either "phandle", "ibm,phandle", or "linux,phandle" that
568 * matches the xref we are looking for.
569 */
570
571 for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
572 rxref = OF_child_xref_phandle(child, xref);
573 if (rxref != -1)
574 return (rxref);
575
576 if (OF_getencprop(child, "phandle", &rxref, sizeof(rxref)) ==
577 -1 && OF_getencprop(child, "ibm,phandle", &rxref,
578 sizeof(rxref)) == -1 && OF_getencprop(child,
579 "linux,phandle", &rxref, sizeof(rxref)) == -1)
580 continue;
581
582 if (rxref == xref)
583 return (child);
584 }
585
586 return (-1);
587 }
588
589 phandle_t
OF_node_from_xref(phandle_t xref)590 OF_node_from_xref(phandle_t xref)
591 {
592 struct xrefinfo *xi;
593 phandle_t node;
594
595 if (xref_init_done) {
596 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
597 return (xref);
598 return (xi->node);
599 }
600
601 if ((node = OF_child_xref_phandle(OF_peer(0), xref)) == -1)
602 return (xref);
603 return (node);
604 }
605
606 phandle_t
OF_xref_from_node(phandle_t node)607 OF_xref_from_node(phandle_t node)
608 {
609 struct xrefinfo *xi;
610 phandle_t xref;
611
612 if (xref_init_done) {
613 if ((xi = xrefinfo_find(node, FIND_BY_NODE)) == NULL)
614 return (node);
615 return (xi->xref);
616 }
617
618 if (OF_getencprop(node, "phandle", &xref, sizeof(xref)) == -1 &&
619 OF_getencprop(node, "ibm,phandle", &xref, sizeof(xref)) == -1 &&
620 OF_getencprop(node, "linux,phandle", &xref, sizeof(xref)) == -1)
621 return (node);
622 return (xref);
623 }
624
625 device_t
OF_device_from_xref(phandle_t xref)626 OF_device_from_xref(phandle_t xref)
627 {
628 struct xrefinfo *xi;
629
630 if (xref_init_done) {
631 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
632 return (NULL);
633 return (xi->dev);
634 }
635 panic("Attempt to find device before xreflist_init");
636 }
637
638 phandle_t
OF_xref_from_device(device_t dev)639 OF_xref_from_device(device_t dev)
640 {
641 struct xrefinfo *xi;
642
643 if (xref_init_done) {
644 if ((xi = xrefinfo_find((uintptr_t)dev, FIND_BY_DEV)) == NULL)
645 return (0);
646 return (xi->xref);
647 }
648 panic("Attempt to find xref before xreflist_init");
649 }
650
651 int
OF_device_register_xref(phandle_t xref,device_t dev)652 OF_device_register_xref(phandle_t xref, device_t dev)
653 {
654 struct xrefinfo *xi;
655
656 /*
657 * If the given xref handle doesn't already exist in the list then we
658 * add a list entry. In theory this can only happen on a system where
659 * nodes don't contain phandle properties and xref and node handles are
660 * synonymous, so the xref handle is added as the node handle as well.
661 */
662 if (xref_init_done) {
663 if ((xi = xrefinfo_find(xref, FIND_BY_XREF)) == NULL)
664 xrefinfo_add(xref, xref, dev);
665 else
666 xi->dev = dev;
667 return (0);
668 }
669 panic("Attempt to register device before xreflist_init");
670 }
671
672 /* Call the method in the scope of a given instance. */
673 int
OF_call_method(const char * method,ihandle_t instance,int nargs,int nreturns,...)674 OF_call_method(const char *method, ihandle_t instance, int nargs, int nreturns,
675 ...)
676 {
677 va_list ap;
678 cell_t args_n_results[12];
679 int n, status;
680
681 if (nargs > 6 || ofw_def_impl == NULL)
682 return (-1);
683 va_start(ap, nreturns);
684 for (n = 0; n < nargs; n++)
685 args_n_results[n] = va_arg(ap, cell_t);
686
687 status = OFW_CALL_METHOD(ofw_obj, instance, method, nargs, nreturns,
688 args_n_results);
689 if (status != 0)
690 return (status);
691
692 for (; n < nargs + nreturns; n++)
693 *va_arg(ap, cell_t *) = args_n_results[n];
694 va_end(ap);
695 return (0);
696 }
697
698 /*
699 * Device I/O functions
700 */
701
702 /* Open an instance for a device. */
703 ihandle_t
OF_open(const char * device)704 OF_open(const char *device)
705 {
706
707 if (ofw_def_impl == NULL)
708 return (0);
709
710 return (OFW_OPEN(ofw_obj, device));
711 }
712
713 /* Close an instance. */
714 void
OF_close(ihandle_t instance)715 OF_close(ihandle_t instance)
716 {
717
718 if (ofw_def_impl == NULL)
719 return;
720
721 OFW_CLOSE(ofw_obj, instance);
722 }
723
724 /* Read from an instance. */
725 ssize_t
OF_read(ihandle_t instance,void * addr,size_t len)726 OF_read(ihandle_t instance, void *addr, size_t len)
727 {
728
729 if (ofw_def_impl == NULL)
730 return (-1);
731
732 return (OFW_READ(ofw_obj, instance, addr, len));
733 }
734
735 /* Write to an instance. */
736 ssize_t
OF_write(ihandle_t instance,const void * addr,size_t len)737 OF_write(ihandle_t instance, const void *addr, size_t len)
738 {
739
740 if (ofw_def_impl == NULL)
741 return (-1);
742
743 return (OFW_WRITE(ofw_obj, instance, addr, len));
744 }
745
746 /* Seek to a position. */
747 int
OF_seek(ihandle_t instance,uint64_t pos)748 OF_seek(ihandle_t instance, uint64_t pos)
749 {
750
751 if (ofw_def_impl == NULL)
752 return (-1);
753
754 return (OFW_SEEK(ofw_obj, instance, pos));
755 }
756
757 /*
758 * Memory functions
759 */
760
761 /* Claim an area of memory. */
762 void *
OF_claim(void * virt,size_t size,u_int align)763 OF_claim(void *virt, size_t size, u_int align)
764 {
765
766 if (ofw_def_impl == NULL)
767 return ((void *)-1);
768
769 return (OFW_CLAIM(ofw_obj, virt, size, align));
770 }
771
772 /* Release an area of memory. */
773 void
OF_release(void * virt,size_t size)774 OF_release(void *virt, size_t size)
775 {
776
777 if (ofw_def_impl == NULL)
778 return;
779
780 OFW_RELEASE(ofw_obj, virt, size);
781 }
782
783 /*
784 * Control transfer functions
785 */
786
787 /* Suspend and drop back to the Open Firmware interface. */
788 void
OF_enter()789 OF_enter()
790 {
791
792 if (ofw_def_impl == NULL)
793 return;
794
795 OFW_ENTER(ofw_obj);
796 }
797
798 /* Shut down and drop back to the Open Firmware interface. */
799 void
OF_exit()800 OF_exit()
801 {
802
803 if (ofw_def_impl == NULL)
804 panic("OF_exit: Open Firmware not available");
805
806 /* Should not return */
807 OFW_EXIT(ofw_obj);
808
809 for (;;) /* just in case */
810 ;
811 }
812