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 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,pcell_t * buf,size_t len)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
OF_getprop_alloc(phandle_t package,const char * propname,void ** buf)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
OF_getprop_alloc_multi(phandle_t package,const char * propname,int elsz,void ** buf)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
OF_getencprop_alloc(phandle_t package,const char * name,void ** buf)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
OF_getencprop_alloc_multi(phandle_t package,const char * name,int elsz,void ** buf)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 */
OF_prop_free(void * buf)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
OF_nextprop(phandle_t package,const char * previous,char * buf,size_t size)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
OF_setprop(phandle_t package,const char * propname,const void * buf,size_t len)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
OF_canon(const char * device,char * buf,size_t len)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
OF_finddevice(const char * device)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
OF_instance_to_path(ihandle_t instance,char * buf,size_t len)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
OF_package_to_path(phandle_t package,char * buf,size_t len)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
OF_child_xref_phandle(phandle_t parent,phandle_t xref)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
OF_node_from_xref(phandle_t xref)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
OF_xref_from_node(phandle_t node)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
OF_device_from_xref(phandle_t xref)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
OF_xref_from_device(device_t dev)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
OF_device_register_xref(phandle_t xref,device_t dev)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
OF_call_method(const char * method,ihandle_t instance,int nargs,int nreturns,...)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
OF_open(const char * device)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
OF_close(ihandle_t instance)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
OF_read(ihandle_t instance,void * addr,size_t len)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
OF_write(ihandle_t instance,const void * addr,size_t len)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
OF_seek(ihandle_t instance,uint64_t pos)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 *
OF_claim(void * virt,size_t size,u_int align)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
OF_release(void * virt,size_t size)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
OF_enter(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
OF_exit(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