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14#include "qemu/osdep.h"
15
16#ifdef CONFIG_LINUX
17#include <dirent.h>
18#endif
19
20#include "qapi/error.h"
21#include "qemu/error-report.h"
22#include "qemu/option.h"
23#include "qemu/bswap.h"
24#include "qemu/cutils.h"
25#include "sysemu/device_tree.h"
26#include "sysemu/sysemu.h"
27#include "hw/loader.h"
28#include "hw/boards.h"
29#include "qemu/config-file.h"
30
31#include <libfdt.h>
32
33#define FDT_MAX_SIZE 0x100000
34
35void *create_device_tree(int *sizep)
36{
37 void *fdt;
38 int ret;
39
40 *sizep = FDT_MAX_SIZE;
41 fdt = g_malloc0(FDT_MAX_SIZE);
42 ret = fdt_create(fdt, FDT_MAX_SIZE);
43 if (ret < 0) {
44 goto fail;
45 }
46 ret = fdt_finish_reservemap(fdt);
47 if (ret < 0) {
48 goto fail;
49 }
50 ret = fdt_begin_node(fdt, "");
51 if (ret < 0) {
52 goto fail;
53 }
54 ret = fdt_end_node(fdt);
55 if (ret < 0) {
56 goto fail;
57 }
58 ret = fdt_finish(fdt);
59 if (ret < 0) {
60 goto fail;
61 }
62 ret = fdt_open_into(fdt, fdt, *sizep);
63 if (ret) {
64 error_report("Unable to copy device tree in memory");
65 exit(1);
66 }
67
68 return fdt;
69fail:
70 error_report("%s Couldn't create dt: %s", __func__, fdt_strerror(ret));
71 exit(1);
72}
73
74void *load_device_tree(const char *filename_path, int *sizep)
75{
76 int dt_size;
77 int dt_file_load_size;
78 int ret;
79 void *fdt = NULL;
80
81 *sizep = 0;
82 dt_size = get_image_size(filename_path);
83 if (dt_size < 0) {
84 error_report("Unable to get size of device tree file '%s'",
85 filename_path);
86 goto fail;
87 }
88 if (dt_size > INT_MAX / 2 - 10000) {
89 error_report("Device tree file '%s' is too large", filename_path);
90 goto fail;
91 }
92
93
94 dt_size += 10000;
95 dt_size *= 2;
96
97 fdt = g_malloc0(dt_size);
98
99 dt_file_load_size = load_image_size(filename_path, fdt, dt_size);
100 if (dt_file_load_size < 0) {
101 error_report("Unable to open device tree file '%s'",
102 filename_path);
103 goto fail;
104 }
105
106 ret = fdt_open_into(fdt, fdt, dt_size);
107 if (ret) {
108 error_report("Unable to copy device tree in memory");
109 goto fail;
110 }
111
112
113 if (fdt_check_header(fdt)) {
114 error_report("Device tree file loaded into memory is invalid: %s",
115 filename_path);
116 goto fail;
117 }
118 *sizep = dt_size;
119 return fdt;
120
121fail:
122 g_free(fdt);
123 return NULL;
124}
125
126#ifdef CONFIG_LINUX
127
128#define SYSFS_DT_BASEDIR "/proc/device-tree"
129
130
131
132
133
134
135
136
137
138
139static void read_fstree(void *fdt, const char *dirname)
140{
141 DIR *d;
142 struct dirent *de;
143 struct stat st;
144 const char *root_dir = SYSFS_DT_BASEDIR;
145 const char *parent_node;
146
147 if (strstr(dirname, root_dir) != dirname) {
148 error_report("%s: %s must be searched within %s",
149 __func__, dirname, root_dir);
150 exit(1);
151 }
152 parent_node = &dirname[strlen(SYSFS_DT_BASEDIR)];
153
154 d = opendir(dirname);
155 if (!d) {
156 error_report("%s cannot open %s", __func__, dirname);
157 exit(1);
158 }
159
160 while ((de = readdir(d)) != NULL) {
161 char *tmpnam;
162
163 if (!g_strcmp0(de->d_name, ".")
164 || !g_strcmp0(de->d_name, "..")) {
165 continue;
166 }
167
168 tmpnam = g_strdup_printf("%s/%s", dirname, de->d_name);
169
170 if (lstat(tmpnam, &st) < 0) {
171 error_report("%s cannot lstat %s", __func__, tmpnam);
172 exit(1);
173 }
174
175 if (S_ISREG(st.st_mode)) {
176 gchar *val;
177 gsize len;
178
179 if (!g_file_get_contents(tmpnam, &val, &len, NULL)) {
180 error_report("%s not able to extract info from %s",
181 __func__, tmpnam);
182 exit(1);
183 }
184
185 if (strlen(parent_node) > 0) {
186 qemu_fdt_setprop(fdt, parent_node,
187 de->d_name, val, len);
188 } else {
189 qemu_fdt_setprop(fdt, "/", de->d_name, val, len);
190 }
191 g_free(val);
192 } else if (S_ISDIR(st.st_mode)) {
193 char *node_name;
194
195 node_name = g_strdup_printf("%s/%s",
196 parent_node, de->d_name);
197 qemu_fdt_add_subnode(fdt, node_name);
198 g_free(node_name);
199 read_fstree(fdt, tmpnam);
200 }
201
202 g_free(tmpnam);
203 }
204
205 closedir(d);
206}
207
208
209void *load_device_tree_from_sysfs(void)
210{
211 void *host_fdt;
212 int host_fdt_size;
213
214 host_fdt = create_device_tree(&host_fdt_size);
215 read_fstree(host_fdt, SYSFS_DT_BASEDIR);
216 if (fdt_check_header(host_fdt)) {
217 error_report("%s host device tree extracted into memory is invalid",
218 __func__);
219 exit(1);
220 }
221 return host_fdt;
222}
223
224#endif
225
226static int findnode_nofail(void *fdt, const char *node_path)
227{
228 int offset;
229
230 offset = fdt_path_offset(fdt, node_path);
231 if (offset < 0) {
232 error_report("%s Couldn't find node %s: %s", __func__, node_path,
233 fdt_strerror(offset));
234 exit(1);
235 }
236
237 return offset;
238}
239
240char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp)
241{
242 char *prefix = g_strdup_printf("%s@", name);
243 unsigned int path_len = 16, n = 0;
244 GSList *path_list = NULL, *iter;
245 const char *iter_name;
246 int offset, len, ret;
247 char **path_array;
248
249 offset = fdt_next_node(fdt, -1, NULL);
250
251 while (offset >= 0) {
252 iter_name = fdt_get_name(fdt, offset, &len);
253 if (!iter_name) {
254 offset = len;
255 break;
256 }
257 if (!strcmp(iter_name, name) || g_str_has_prefix(iter_name, prefix)) {
258 char *path;
259
260 path = g_malloc(path_len);
261 while ((ret = fdt_get_path(fdt, offset, path, path_len))
262 == -FDT_ERR_NOSPACE) {
263 path_len += 16;
264 path = g_realloc(path, path_len);
265 }
266 path_list = g_slist_prepend(path_list, path);
267 n++;
268 }
269 offset = fdt_next_node(fdt, offset, NULL);
270 }
271 g_free(prefix);
272
273 if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
274 error_setg(errp, "%s: abort parsing dt for %s node units: %s",
275 __func__, name, fdt_strerror(offset));
276 for (iter = path_list; iter; iter = iter->next) {
277 g_free(iter->data);
278 }
279 g_slist_free(path_list);
280 return NULL;
281 }
282
283 path_array = g_new(char *, n + 1);
284 path_array[n--] = NULL;
285
286 for (iter = path_list; iter; iter = iter->next) {
287 path_array[n--] = iter->data;
288 }
289
290 g_slist_free(path_list);
291
292 return path_array;
293}
294
295char **qemu_fdt_node_path(void *fdt, const char *name, const char *compat,
296 Error **errp)
297{
298 int offset, len, ret;
299 const char *iter_name;
300 unsigned int path_len = 16, n = 0;
301 GSList *path_list = NULL, *iter;
302 char **path_array;
303
304 offset = fdt_node_offset_by_compatible(fdt, -1, compat);
305
306 while (offset >= 0) {
307 iter_name = fdt_get_name(fdt, offset, &len);
308 if (!iter_name) {
309 offset = len;
310 break;
311 }
312 if (!name || !strcmp(iter_name, name)) {
313 char *path;
314
315 path = g_malloc(path_len);
316 while ((ret = fdt_get_path(fdt, offset, path, path_len))
317 == -FDT_ERR_NOSPACE) {
318 path_len += 16;
319 path = g_realloc(path, path_len);
320 }
321 path_list = g_slist_prepend(path_list, path);
322 n++;
323 }
324 offset = fdt_node_offset_by_compatible(fdt, offset, compat);
325 }
326
327 if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
328 error_setg(errp, "%s: abort parsing dt for %s/%s: %s",
329 __func__, name, compat, fdt_strerror(offset));
330 for (iter = path_list; iter; iter = iter->next) {
331 g_free(iter->data);
332 }
333 g_slist_free(path_list);
334 return NULL;
335 }
336
337 path_array = g_new(char *, n + 1);
338 path_array[n--] = NULL;
339
340 for (iter = path_list; iter; iter = iter->next) {
341 path_array[n--] = iter->data;
342 }
343
344 g_slist_free(path_list);
345
346 return path_array;
347}
348
349int qemu_fdt_setprop(void *fdt, const char *node_path,
350 const char *property, const void *val, int size)
351{
352 int r;
353
354 r = fdt_setprop(fdt, findnode_nofail(fdt, node_path), property, val, size);
355 if (r < 0) {
356 error_report("%s: Couldn't set %s/%s: %s", __func__, node_path,
357 property, fdt_strerror(r));
358 exit(1);
359 }
360
361 return r;
362}
363
364int qemu_fdt_setprop_cell(void *fdt, const char *node_path,
365 const char *property, uint32_t val)
366{
367 int r;
368
369 r = fdt_setprop_cell(fdt, findnode_nofail(fdt, node_path), property, val);
370 if (r < 0) {
371 error_report("%s: Couldn't set %s/%s = %#08x: %s", __func__,
372 node_path, property, val, fdt_strerror(r));
373 exit(1);
374 }
375
376 return r;
377}
378
379int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
380 const char *property, uint64_t val)
381{
382 val = cpu_to_be64(val);
383 return qemu_fdt_setprop(fdt, node_path, property, &val, sizeof(val));
384}
385
386int qemu_fdt_setprop_string(void *fdt, const char *node_path,
387 const char *property, const char *string)
388{
389 int r;
390
391 r = fdt_setprop_string(fdt, findnode_nofail(fdt, node_path), property, string);
392 if (r < 0) {
393 error_report("%s: Couldn't set %s/%s = %s: %s", __func__,
394 node_path, property, string, fdt_strerror(r));
395 exit(1);
396 }
397
398 return r;
399}
400
401
402
403
404
405
406int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
407 const char *prop, char **array, int len)
408{
409 int ret, i, total_len = 0;
410 char *str, *p;
411 for (i = 0; i < len; i++) {
412 total_len += strlen(array[i]) + 1;
413 }
414 p = str = g_malloc0(total_len);
415 for (i = 0; i < len; i++) {
416 int len = strlen(array[i]) + 1;
417 pstrcpy(p, len, array[i]);
418 p += len;
419 }
420
421 ret = qemu_fdt_setprop(fdt, node_path, prop, str, total_len);
422 g_free(str);
423 return ret;
424}
425
426const void *qemu_fdt_getprop(void *fdt, const char *node_path,
427 const char *property, int *lenp, Error **errp)
428{
429 int len;
430 const void *r;
431
432 if (!lenp) {
433 lenp = &len;
434 }
435 r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp);
436 if (!r) {
437 error_setg(errp, "%s: Couldn't get %s/%s: %s", __func__,
438 node_path, property, fdt_strerror(*lenp));
439 }
440 return r;
441}
442
443uint32_t qemu_fdt_getprop_cell(void *fdt, const char *node_path,
444 const char *property, int *lenp, Error **errp)
445{
446 int len;
447 const uint32_t *p;
448
449 if (!lenp) {
450 lenp = &len;
451 }
452 p = qemu_fdt_getprop(fdt, node_path, property, lenp, errp);
453 if (!p) {
454 return 0;
455 } else if (*lenp != 4) {
456 error_setg(errp, "%s: %s/%s not 4 bytes long (not a cell?)",
457 __func__, node_path, property);
458 *lenp = -EINVAL;
459 return 0;
460 }
461 return be32_to_cpu(*p);
462}
463
464uint32_t qemu_fdt_get_phandle(void *fdt, const char *path)
465{
466 uint32_t r;
467
468 r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
469 if (r == 0) {
470 error_report("%s: Couldn't get phandle for %s: %s", __func__,
471 path, fdt_strerror(r));
472 exit(1);
473 }
474
475 return r;
476}
477
478int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
479 const char *property,
480 const char *target_node_path)
481{
482 uint32_t phandle = qemu_fdt_get_phandle(fdt, target_node_path);
483 return qemu_fdt_setprop_cell(fdt, node_path, property, phandle);
484}
485
486uint32_t qemu_fdt_alloc_phandle(void *fdt)
487{
488 static int phandle = 0x0;
489
490
491
492
493
494 if (!phandle) {
495 phandle = machine_phandle_start(current_machine);
496 }
497
498 if (!phandle) {
499
500
501
502
503 phandle = 0x8000;
504 }
505
506 return phandle++;
507}
508
509int qemu_fdt_nop_node(void *fdt, const char *node_path)
510{
511 int r;
512
513 r = fdt_nop_node(fdt, findnode_nofail(fdt, node_path));
514 if (r < 0) {
515 error_report("%s: Couldn't nop node %s: %s", __func__, node_path,
516 fdt_strerror(r));
517 exit(1);
518 }
519
520 return r;
521}
522
523int qemu_fdt_add_subnode(void *fdt, const char *name)
524{
525 char *dupname = g_strdup(name);
526 char *basename = strrchr(dupname, '/');
527 int retval;
528 int parent = 0;
529
530 if (!basename) {
531 g_free(dupname);
532 return -1;
533 }
534
535 basename[0] = '\0';
536 basename++;
537
538 if (dupname[0]) {
539 parent = findnode_nofail(fdt, dupname);
540 }
541
542 retval = fdt_add_subnode(fdt, parent, basename);
543 if (retval < 0) {
544 error_report("FDT: Failed to create subnode %s: %s", name,
545 fdt_strerror(retval));
546 exit(1);
547 }
548
549 g_free(dupname);
550 return retval;
551}
552
553void qemu_fdt_dumpdtb(void *fdt, int size)
554{
555 const char *dumpdtb = current_machine->dumpdtb;
556
557 if (dumpdtb) {
558
559 if (g_file_set_contents(dumpdtb, fdt, size, NULL)) {
560 info_report("dtb dumped to %s. Exiting.", dumpdtb);
561 exit(0);
562 }
563 error_report("%s: Failed dumping dtb to %s", __func__, dumpdtb);
564 exit(1);
565 }
566}
567
568int qemu_fdt_setprop_sized_cells_from_array(void *fdt,
569 const char *node_path,
570 const char *property,
571 int numvalues,
572 uint64_t *values)
573{
574 uint32_t *propcells;
575 uint64_t value;
576 int cellnum, vnum, ncells;
577 uint32_t hival;
578 int ret;
579
580 propcells = g_new0(uint32_t, numvalues * 2);
581
582 cellnum = 0;
583 for (vnum = 0; vnum < numvalues; vnum++) {
584 ncells = values[vnum * 2];
585 if (ncells != 1 && ncells != 2) {
586 ret = -1;
587 goto out;
588 }
589 value = values[vnum * 2 + 1];
590 hival = cpu_to_be32(value >> 32);
591 if (ncells > 1) {
592 propcells[cellnum++] = hival;
593 } else if (hival != 0) {
594 ret = -1;
595 goto out;
596 }
597 propcells[cellnum++] = cpu_to_be32(value);
598 }
599
600 ret = qemu_fdt_setprop(fdt, node_path, property, propcells,
601 cellnum * sizeof(uint32_t));
602out:
603 g_free(propcells);
604 return ret;
605}
606