1 /*
2 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005.
3 *
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21 #include "dtc.h"
22 #include "srcpos.h"
23
24 #define FTF_FULLPATH 0x1
25 #define FTF_VARALIGN 0x2
26 #define FTF_NAMEPROPS 0x4
27 #define FTF_BOOTCPUID 0x8
28 #define FTF_STRTABSIZE 0x10
29 #define FTF_STRUCTSIZE 0x20
30 #define FTF_NOPS 0x40
31
32 static struct version_info {
33 int version;
34 int last_comp_version;
35 int hdr_size;
36 int flags;
37 } version_table[] = {
38 {1, 1, FDT_V1_SIZE,
39 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS},
40 {2, 1, FDT_V2_SIZE,
41 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID},
42 {3, 1, FDT_V3_SIZE,
43 FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID|FTF_STRTABSIZE},
44 {16, 16, FDT_V3_SIZE,
45 FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_NOPS},
46 {17, 16, FDT_V17_SIZE,
47 FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_STRUCTSIZE|FTF_NOPS},
48 };
49
50 struct emitter {
51 void (*cell)(void *, cell_t);
52 void (*string)(void *, char *, int);
53 void (*align)(void *, int);
54 void (*data)(void *, struct data);
55 void (*beginnode)(void *, const char *);
56 void (*endnode)(void *, const char *);
57 void (*property)(void *, const char *);
58 };
59
bin_emit_cell(void * e,cell_t val)60 static void bin_emit_cell(void *e, cell_t val)
61 {
62 struct data *dtbuf = e;
63
64 *dtbuf = data_append_cell(*dtbuf, val);
65 }
66
bin_emit_string(void * e,char * str,int len)67 static void bin_emit_string(void *e, char *str, int len)
68 {
69 struct data *dtbuf = e;
70
71 if (len == 0)
72 len = strlen(str);
73
74 *dtbuf = data_append_data(*dtbuf, str, len);
75 *dtbuf = data_append_byte(*dtbuf, '\0');
76 }
77
bin_emit_align(void * e,int a)78 static void bin_emit_align(void *e, int a)
79 {
80 struct data *dtbuf = e;
81
82 *dtbuf = data_append_align(*dtbuf, a);
83 }
84
bin_emit_data(void * e,struct data d)85 static void bin_emit_data(void *e, struct data d)
86 {
87 struct data *dtbuf = e;
88
89 *dtbuf = data_append_data(*dtbuf, d.val, d.len);
90 }
91
bin_emit_beginnode(void * e,const char * label)92 static void bin_emit_beginnode(void *e, const char *label)
93 {
94 bin_emit_cell(e, FDT_BEGIN_NODE);
95 }
96
bin_emit_endnode(void * e,const char * label)97 static void bin_emit_endnode(void *e, const char *label)
98 {
99 bin_emit_cell(e, FDT_END_NODE);
100 }
101
bin_emit_property(void * e,const char * label)102 static void bin_emit_property(void *e, const char *label)
103 {
104 bin_emit_cell(e, FDT_PROP);
105 }
106
107 static struct emitter bin_emitter = {
108 .cell = bin_emit_cell,
109 .string = bin_emit_string,
110 .align = bin_emit_align,
111 .data = bin_emit_data,
112 .beginnode = bin_emit_beginnode,
113 .endnode = bin_emit_endnode,
114 .property = bin_emit_property,
115 };
116
emit_label(FILE * f,const char * prefix,const char * label)117 static void emit_label(FILE *f, const char *prefix, const char *label)
118 {
119 fprintf(f, "\t.globl\t%s_%s\n", prefix, label);
120 fprintf(f, "%s_%s:\n", prefix, label);
121 fprintf(f, "_%s_%s:\n", prefix, label);
122 }
123
emit_offset_label(FILE * f,const char * label,int offset)124 static void emit_offset_label(FILE *f, const char *label, int offset)
125 {
126 fprintf(f, "\t.globl\t%s\n", label);
127 fprintf(f, "%s\t= . + %d\n", label, offset);
128 }
129
asm_emit_cell(void * e,cell_t val)130 static void asm_emit_cell(void *e, cell_t val)
131 {
132 FILE *f = e;
133
134 fprintf(f, "\t.long\t0x%x\n", val);
135 }
136
asm_emit_string(void * e,char * str,int len)137 static void asm_emit_string(void *e, char *str, int len)
138 {
139 FILE *f = e;
140 char c = 0;
141
142 if (len != 0) {
143 /* XXX: ewww */
144 c = str[len];
145 str[len] = '\0';
146 }
147
148 fprintf(f, "\t.string\t\"%s\"\n", str);
149
150 if (len != 0) {
151 str[len] = c;
152 }
153 }
154
asm_emit_align(void * e,int a)155 static void asm_emit_align(void *e, int a)
156 {
157 FILE *f = e;
158
159 fprintf(f, "\t.balign\t%d\n", a);
160 }
161
asm_emit_data(void * e,struct data d)162 static void asm_emit_data(void *e, struct data d)
163 {
164 FILE *f = e;
165 int off = 0;
166 struct marker *m = d.markers;
167
168 for_each_marker_of_type(m, LABEL)
169 emit_offset_label(f, m->ref, m->offset);
170
171 while ((d.len - off) >= sizeof(uint32_t)) {
172 fprintf(f, "\t.long\t0x%x\n",
173 fdt32_to_cpu(*((uint32_t *)(d.val+off))));
174 off += sizeof(uint32_t);
175 }
176
177 while ((d.len - off) >= 1) {
178 fprintf(f, "\t.byte\t0x%hhx\n", d.val[off]);
179 off += 1;
180 }
181
182 assert(off == d.len);
183 }
184
asm_emit_beginnode(void * e,const char * label)185 static void asm_emit_beginnode(void *e, const char *label)
186 {
187 FILE *f = e;
188
189 if (label) {
190 fprintf(f, "\t.globl\t%s\n", label);
191 fprintf(f, "%s:\n", label);
192 }
193 fprintf(f, "\t.long\tFDT_BEGIN_NODE\n");
194 }
195
asm_emit_endnode(void * e,const char * label)196 static void asm_emit_endnode(void *e, const char *label)
197 {
198 FILE *f = e;
199
200 fprintf(f, "\t.long\tFDT_END_NODE\n");
201 if (label) {
202 fprintf(f, "\t.globl\t%s_end\n", label);
203 fprintf(f, "%s_end:\n", label);
204 }
205 }
206
asm_emit_property(void * e,const char * label)207 static void asm_emit_property(void *e, const char *label)
208 {
209 FILE *f = e;
210
211 if (label) {
212 fprintf(f, "\t.globl\t%s\n", label);
213 fprintf(f, "%s:\n", label);
214 }
215 fprintf(f, "\t.long\tFDT_PROP\n");
216 }
217
218 static struct emitter asm_emitter = {
219 .cell = asm_emit_cell,
220 .string = asm_emit_string,
221 .align = asm_emit_align,
222 .data = asm_emit_data,
223 .beginnode = asm_emit_beginnode,
224 .endnode = asm_emit_endnode,
225 .property = asm_emit_property,
226 };
227
stringtable_insert(struct data * d,const char * str)228 static int stringtable_insert(struct data *d, const char *str)
229 {
230 int i;
231
232 /* FIXME: do this more efficiently? */
233
234 for (i = 0; i < d->len; i++) {
235 if (streq(str, d->val + i))
236 return i;
237 }
238
239 *d = data_append_data(*d, str, strlen(str)+1);
240 return i;
241 }
242
flatten_tree(struct node * tree,struct emitter * emit,void * etarget,struct data * strbuf,struct version_info * vi)243 static void flatten_tree(struct node *tree, struct emitter *emit,
244 void *etarget, struct data *strbuf,
245 struct version_info *vi)
246 {
247 struct property *prop;
248 struct node *child;
249 int seen_name_prop = 0;
250
251 emit->beginnode(etarget, tree->label);
252
253 if (vi->flags & FTF_FULLPATH)
254 emit->string(etarget, tree->fullpath, 0);
255 else
256 emit->string(etarget, tree->name, 0);
257
258 emit->align(etarget, sizeof(cell_t));
259
260 for_each_property(tree, prop) {
261 int nameoff;
262
263 if (streq(prop->name, "name"))
264 seen_name_prop = 1;
265
266 nameoff = stringtable_insert(strbuf, prop->name);
267
268 emit->property(etarget, prop->label);
269 emit->cell(etarget, prop->val.len);
270 emit->cell(etarget, nameoff);
271
272 if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8))
273 emit->align(etarget, 8);
274
275 emit->data(etarget, prop->val);
276 emit->align(etarget, sizeof(cell_t));
277 }
278
279 if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) {
280 emit->property(etarget, NULL);
281 emit->cell(etarget, tree->basenamelen+1);
282 emit->cell(etarget, stringtable_insert(strbuf, "name"));
283
284 if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8))
285 emit->align(etarget, 8);
286
287 emit->string(etarget, tree->name, tree->basenamelen);
288 emit->align(etarget, sizeof(cell_t));
289 }
290
291 for_each_child(tree, child) {
292 flatten_tree(child, emit, etarget, strbuf, vi);
293 }
294
295 emit->endnode(etarget, tree->label);
296 }
297
flatten_reserve_list(struct reserve_info * reservelist,struct version_info * vi)298 static struct data flatten_reserve_list(struct reserve_info *reservelist,
299 struct version_info *vi)
300 {
301 struct reserve_info *re;
302 struct data d = empty_data;
303 static struct fdt_reserve_entry null_re = {0,0};
304 int j;
305
306 for (re = reservelist; re; re = re->next) {
307 d = data_append_re(d, &re->re);
308 }
309 /*
310 * Add additional reserved slots if the user asked for them.
311 */
312 for (j = 0; j < reservenum; j++) {
313 d = data_append_re(d, &null_re);
314 }
315
316 return d;
317 }
318
make_fdt_header(struct fdt_header * fdt,struct version_info * vi,int reservesize,int dtsize,int strsize,int boot_cpuid_phys)319 static void make_fdt_header(struct fdt_header *fdt,
320 struct version_info *vi,
321 int reservesize, int dtsize, int strsize,
322 int boot_cpuid_phys)
323 {
324 int reserve_off;
325
326 reservesize += sizeof(struct fdt_reserve_entry);
327
328 memset(fdt, 0xff, sizeof(*fdt));
329
330 fdt->magic = cpu_to_fdt32(FDT_MAGIC);
331 fdt->version = cpu_to_fdt32(vi->version);
332 fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version);
333
334 /* Reserve map should be doubleword aligned */
335 reserve_off = ALIGN(vi->hdr_size, 8);
336
337 fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off);
338 fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize);
339 fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize
340 + dtsize);
341 fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize);
342
343 if (vi->flags & FTF_BOOTCPUID)
344 fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys);
345 if (vi->flags & FTF_STRTABSIZE)
346 fdt->size_dt_strings = cpu_to_fdt32(strsize);
347 if (vi->flags & FTF_STRUCTSIZE)
348 fdt->size_dt_struct = cpu_to_fdt32(dtsize);
349 }
350
dt_to_blob(FILE * f,struct boot_info * bi,int version)351 void dt_to_blob(FILE *f, struct boot_info *bi, int version)
352 {
353 struct version_info *vi = NULL;
354 int i;
355 struct data blob = empty_data;
356 struct data reservebuf = empty_data;
357 struct data dtbuf = empty_data;
358 struct data strbuf = empty_data;
359 struct fdt_header fdt;
360 int padlen = 0;
361
362 for (i = 0; i < ARRAY_SIZE(version_table); i++) {
363 if (version_table[i].version == version)
364 vi = &version_table[i];
365 }
366 if (!vi)
367 die("Unknown device tree blob version %d\n", version);
368
369 flatten_tree(bi->dt, &bin_emitter, &dtbuf, &strbuf, vi);
370 bin_emit_cell(&dtbuf, FDT_END);
371
372 reservebuf = flatten_reserve_list(bi->reservelist, vi);
373
374 /* Make header */
375 make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len,
376 bi->boot_cpuid_phys);
377
378 /*
379 * If the user asked for more space than is used, adjust the totalsize.
380 */
381 if (minsize > 0) {
382 padlen = minsize - fdt32_to_cpu(fdt.totalsize);
383 if ((padlen < 0) && (quiet < 1))
384 fprintf(stderr,
385 "Warning: blob size %d >= minimum size %d\n",
386 fdt32_to_cpu(fdt.totalsize), minsize);
387 }
388
389 if (padsize > 0)
390 padlen = padsize;
391
392 if (padlen > 0) {
393 int tsize = fdt32_to_cpu(fdt.totalsize);
394 tsize += padlen;
395 fdt.totalsize = cpu_to_fdt32(tsize);
396 }
397
398 /*
399 * Assemble the blob: start with the header, add with alignment
400 * the reserve buffer, add the reserve map terminating zeroes,
401 * the device tree itself, and finally the strings.
402 */
403 blob = data_append_data(blob, &fdt, vi->hdr_size);
404 blob = data_append_align(blob, 8);
405 blob = data_merge(blob, reservebuf);
406 blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry));
407 blob = data_merge(blob, dtbuf);
408 blob = data_merge(blob, strbuf);
409
410 /*
411 * If the user asked for more space than is used, pad out the blob.
412 */
413 if (padlen > 0)
414 blob = data_append_zeroes(blob, padlen);
415
416 fwrite(blob.val, blob.len, 1, f);
417
418 if (ferror(f))
419 die("Error writing device tree blob: %s\n", strerror(errno));
420
421 /*
422 * data_merge() frees the right-hand element so only the blob
423 * remains to be freed.
424 */
425 data_free(blob);
426 }
427
dump_stringtable_asm(FILE * f,struct data strbuf)428 static void dump_stringtable_asm(FILE *f, struct data strbuf)
429 {
430 const char *p;
431 int len;
432
433 p = strbuf.val;
434
435 while (p < (strbuf.val + strbuf.len)) {
436 len = strlen(p);
437 fprintf(f, "\t.string \"%s\"\n", p);
438 p += len+1;
439 }
440 }
441
dt_to_asm(FILE * f,struct boot_info * bi,int version)442 void dt_to_asm(FILE *f, struct boot_info *bi, int version)
443 {
444 struct version_info *vi = NULL;
445 int i;
446 struct data strbuf = empty_data;
447 struct reserve_info *re;
448 const char *symprefix = "dt";
449
450 for (i = 0; i < ARRAY_SIZE(version_table); i++) {
451 if (version_table[i].version == version)
452 vi = &version_table[i];
453 }
454 if (!vi)
455 die("Unknown device tree blob version %d\n", version);
456
457 fprintf(f, "/* autogenerated by dtc, do not edit */\n\n");
458 fprintf(f, "#define FDT_MAGIC 0x%x\n", FDT_MAGIC);
459 fprintf(f, "#define FDT_BEGIN_NODE 0x%x\n", FDT_BEGIN_NODE);
460 fprintf(f, "#define FDT_END_NODE 0x%x\n", FDT_END_NODE);
461 fprintf(f, "#define FDT_PROP 0x%x\n", FDT_PROP);
462 fprintf(f, "#define FDT_END 0x%x\n", FDT_END);
463 fprintf(f, "\n");
464
465 emit_label(f, symprefix, "blob_start");
466 emit_label(f, symprefix, "header");
467 fprintf(f, "\t.long\tFDT_MAGIC\t\t\t\t/* magic */\n");
468 fprintf(f, "\t.long\t_%s_blob_abs_end - _%s_blob_start\t/* totalsize */\n",
469 symprefix, symprefix);
470 fprintf(f, "\t.long\t_%s_struct_start - _%s_blob_start\t/* off_dt_struct */\n",
471 symprefix, symprefix);
472 fprintf(f, "\t.long\t_%s_strings_start - _%s_blob_start\t/* off_dt_strings */\n",
473 symprefix, symprefix);
474 fprintf(f, "\t.long\t_%s_reserve_map - _%s_blob_start\t/* off_dt_strings */\n",
475 symprefix, symprefix);
476 fprintf(f, "\t.long\t%d\t\t\t\t\t/* version */\n", vi->version);
477 fprintf(f, "\t.long\t%d\t\t\t\t\t/* last_comp_version */\n",
478 vi->last_comp_version);
479
480 if (vi->flags & FTF_BOOTCPUID)
481 fprintf(f, "\t.long\t%i\t\t\t\t\t/* boot_cpuid_phys */\n",
482 bi->boot_cpuid_phys);
483
484 if (vi->flags & FTF_STRTABSIZE)
485 fprintf(f, "\t.long\t_%s_strings_end - _%s_strings_start\t/* size_dt_strings */\n",
486 symprefix, symprefix);
487
488 if (vi->flags & FTF_STRUCTSIZE)
489 fprintf(f, "\t.long\t_%s_struct_end - _%s_struct_start\t/* size_dt_struct */\n",
490 symprefix, symprefix);
491
492 /*
493 * Reserve map entries.
494 * Align the reserve map to a doubleword boundary.
495 * Each entry is an (address, size) pair of u64 values.
496 * Always supply a zero-sized temination entry.
497 */
498 asm_emit_align(f, 8);
499 emit_label(f, symprefix, "reserve_map");
500
501 fprintf(f, "/* Memory reserve map from source file */\n");
502
503 /*
504 * Use .long on high and low halfs of u64s to avoid .quad
505 * as it appears .quad isn't available in some assemblers.
506 */
507 for (re = bi->reservelist; re; re = re->next) {
508 if (re->label) {
509 fprintf(f, "\t.globl\t%s\n", re->label);
510 fprintf(f, "%s:\n", re->label);
511 }
512 fprintf(f, "\t.long\t0x%08x, 0x%08x\n",
513 (unsigned int)(re->re.address >> 32),
514 (unsigned int)(re->re.address & 0xffffffff));
515 fprintf(f, "\t.long\t0x%08x, 0x%08x\n",
516 (unsigned int)(re->re.size >> 32),
517 (unsigned int)(re->re.size & 0xffffffff));
518 }
519 for (i = 0; i < reservenum; i++) {
520 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");
521 }
522
523 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");
524
525 emit_label(f, symprefix, "struct_start");
526 flatten_tree(bi->dt, &asm_emitter, f, &strbuf, vi);
527 fprintf(f, "\t.long\tFDT_END\n");
528 emit_label(f, symprefix, "struct_end");
529
530 emit_label(f, symprefix, "strings_start");
531 dump_stringtable_asm(f, strbuf);
532 emit_label(f, symprefix, "strings_end");
533
534 emit_label(f, symprefix, "blob_end");
535
536 /*
537 * If the user asked for more space than is used, pad it out.
538 */
539 if (minsize > 0) {
540 fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n",
541 minsize, symprefix, symprefix);
542 }
543 if (padsize > 0) {
544 fprintf(f, "\t.space\t%d, 0\n", padsize);
545 }
546 emit_label(f, symprefix, "blob_abs_end");
547
548 data_free(strbuf);
549 }
550
551 struct inbuf {
552 char *base, *limit, *ptr;
553 };
554
inbuf_init(struct inbuf * inb,void * base,void * limit)555 static void inbuf_init(struct inbuf *inb, void *base, void *limit)
556 {
557 inb->base = base;
558 inb->limit = limit;
559 inb->ptr = inb->base;
560 }
561
flat_read_chunk(struct inbuf * inb,void * p,int len)562 static void flat_read_chunk(struct inbuf *inb, void *p, int len)
563 {
564 if ((inb->ptr + len) > inb->limit)
565 die("Premature end of data parsing flat device tree\n");
566
567 memcpy(p, inb->ptr, len);
568
569 inb->ptr += len;
570 }
571
flat_read_word(struct inbuf * inb)572 static uint32_t flat_read_word(struct inbuf *inb)
573 {
574 uint32_t val;
575
576 assert(((inb->ptr - inb->base) % sizeof(val)) == 0);
577
578 flat_read_chunk(inb, &val, sizeof(val));
579
580 return fdt32_to_cpu(val);
581 }
582
flat_realign(struct inbuf * inb,int align)583 static void flat_realign(struct inbuf *inb, int align)
584 {
585 int off = inb->ptr - inb->base;
586
587 inb->ptr = inb->base + ALIGN(off, align);
588 if (inb->ptr > inb->limit)
589 die("Premature end of data parsing flat device tree\n");
590 }
591
flat_read_string(struct inbuf * inb)592 static char *flat_read_string(struct inbuf *inb)
593 {
594 int len = 0;
595 const char *p = inb->ptr;
596 char *str;
597
598 do {
599 if (p >= inb->limit)
600 die("Premature end of data parsing flat device tree\n");
601 len++;
602 } while ((*p++) != '\0');
603
604 str = strdup(inb->ptr);
605
606 inb->ptr += len;
607
608 flat_realign(inb, sizeof(uint32_t));
609
610 return str;
611 }
612
flat_read_data(struct inbuf * inb,int len)613 static struct data flat_read_data(struct inbuf *inb, int len)
614 {
615 struct data d = empty_data;
616
617 if (len == 0)
618 return empty_data;
619
620 d = data_grow_for(d, len);
621 d.len = len;
622
623 flat_read_chunk(inb, d.val, len);
624
625 flat_realign(inb, sizeof(uint32_t));
626
627 return d;
628 }
629
flat_read_stringtable(struct inbuf * inb,int offset)630 static char *flat_read_stringtable(struct inbuf *inb, int offset)
631 {
632 const char *p;
633
634 p = inb->base + offset;
635 while (1) {
636 if (p >= inb->limit || p < inb->base)
637 die("String offset %d overruns string table\n",
638 offset);
639
640 if (*p == '\0')
641 break;
642
643 p++;
644 }
645
646 return strdup(inb->base + offset);
647 }
648
flat_read_property(struct inbuf * dtbuf,struct inbuf * strbuf,int flags)649 static struct property *flat_read_property(struct inbuf *dtbuf,
650 struct inbuf *strbuf, int flags)
651 {
652 uint32_t proplen, stroff;
653 char *name;
654 struct data val;
655
656 proplen = flat_read_word(dtbuf);
657 stroff = flat_read_word(dtbuf);
658
659 name = flat_read_stringtable(strbuf, stroff);
660
661 if ((flags & FTF_VARALIGN) && (proplen >= 8))
662 flat_realign(dtbuf, 8);
663
664 val = flat_read_data(dtbuf, proplen);
665
666 return build_property(name, val, NULL);
667 }
668
669
flat_read_mem_reserve(struct inbuf * inb)670 static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb)
671 {
672 struct reserve_info *reservelist = NULL;
673 struct reserve_info *new;
674 const char *p;
675 struct fdt_reserve_entry re;
676
677 /*
678 * Each entry is a pair of u64 (addr, size) values for 4 cell_t's.
679 * List terminates at an entry with size equal to zero.
680 *
681 * First pass, count entries.
682 */
683 p = inb->ptr;
684 while (1) {
685 flat_read_chunk(inb, &re, sizeof(re));
686 re.address = fdt64_to_cpu(re.address);
687 re.size = fdt64_to_cpu(re.size);
688 if (re.size == 0)
689 break;
690
691 new = build_reserve_entry(re.address, re.size, NULL);
692 reservelist = add_reserve_entry(reservelist, new);
693 }
694
695 return reservelist;
696 }
697
698
nodename_from_path(const char * ppath,const char * cpath)699 static char *nodename_from_path(const char *ppath, const char *cpath)
700 {
701 int plen;
702
703 plen = strlen(ppath);
704
705 if (!strneq(ppath, cpath, plen))
706 die("Path \"%s\" is not valid as a child of \"%s\"\n",
707 cpath, ppath);
708
709 /* root node is a special case */
710 if (!streq(ppath, "/"))
711 plen++;
712
713 return strdup(cpath + plen);
714 }
715
unflatten_tree(struct inbuf * dtbuf,struct inbuf * strbuf,const char * parent_flatname,int flags)716 static struct node *unflatten_tree(struct inbuf *dtbuf,
717 struct inbuf *strbuf,
718 const char *parent_flatname, int flags)
719 {
720 struct node *node;
721 char *flatname;
722 uint32_t val;
723
724 node = build_node(NULL, NULL);
725
726 flatname = flat_read_string(dtbuf);
727
728 if (flags & FTF_FULLPATH)
729 node->name = nodename_from_path(parent_flatname, flatname);
730 else
731 node->name = flatname;
732
733 do {
734 struct property *prop;
735 struct node *child;
736
737 val = flat_read_word(dtbuf);
738 switch (val) {
739 case FDT_PROP:
740 if (node->children)
741 fprintf(stderr, "Warning: Flat tree input has "
742 "subnodes preceding a property.\n");
743 prop = flat_read_property(dtbuf, strbuf, flags);
744 add_property(node, prop);
745 break;
746
747 case FDT_BEGIN_NODE:
748 child = unflatten_tree(dtbuf,strbuf, flatname, flags);
749 add_child(node, child);
750 break;
751
752 case FDT_END_NODE:
753 break;
754
755 case FDT_END:
756 die("Premature FDT_END in device tree blob\n");
757 break;
758
759 case FDT_NOP:
760 if (!(flags & FTF_NOPS))
761 fprintf(stderr, "Warning: NOP tag found in flat tree"
762 " version <16\n");
763
764 /* Ignore */
765 break;
766
767 default:
768 die("Invalid opcode word %08x in device tree blob\n",
769 val);
770 }
771 } while (val != FDT_END_NODE);
772
773 return node;
774 }
775
776
dt_from_blob(const char * fname)777 struct boot_info *dt_from_blob(const char *fname)
778 {
779 struct dtc_file *dtcf;
780 uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys;
781 uint32_t off_dt, off_str, off_mem_rsvmap;
782 int rc;
783 char *blob;
784 struct fdt_header *fdt;
785 char *p;
786 struct inbuf dtbuf, strbuf;
787 struct inbuf memresvbuf;
788 int sizeleft;
789 struct reserve_info *reservelist;
790 struct node *tree;
791 uint32_t val;
792 int flags = 0;
793
794 dtcf = dtc_open_file(fname, NULL);
795
796 rc = fread(&magic, sizeof(magic), 1, dtcf->file);
797 if (ferror(dtcf->file))
798 die("Error reading DT blob magic number: %s\n",
799 strerror(errno));
800 if (rc < 1) {
801 if (feof(dtcf->file))
802 die("EOF reading DT blob magic number\n");
803 else
804 die("Mysterious short read reading magic number\n");
805 }
806
807 magic = fdt32_to_cpu(magic);
808 if (magic != FDT_MAGIC)
809 die("Blob has incorrect magic number\n");
810
811 rc = fread(&totalsize, sizeof(totalsize), 1, dtcf->file);
812 if (ferror(dtcf->file))
813 die("Error reading DT blob size: %s\n", strerror(errno));
814 if (rc < 1) {
815 if (feof(dtcf->file))
816 die("EOF reading DT blob size\n");
817 else
818 die("Mysterious short read reading blob size\n");
819 }
820
821 totalsize = fdt32_to_cpu(totalsize);
822 if (totalsize < FDT_V1_SIZE)
823 die("DT blob size (%d) is too small\n", totalsize);
824
825 blob = xmalloc(totalsize);
826
827 fdt = (struct fdt_header *)blob;
828 fdt->magic = cpu_to_fdt32(magic);
829 fdt->totalsize = cpu_to_fdt32(totalsize);
830
831 sizeleft = totalsize - sizeof(magic) - sizeof(totalsize);
832 p = blob + sizeof(magic) + sizeof(totalsize);
833
834 while (sizeleft) {
835 if (feof(dtcf->file))
836 die("EOF before reading %d bytes of DT blob\n",
837 totalsize);
838
839 rc = fread(p, 1, sizeleft, dtcf->file);
840 if (ferror(dtcf->file))
841 die("Error reading DT blob: %s\n",
842 strerror(errno));
843
844 sizeleft -= rc;
845 p += rc;
846 }
847
848 off_dt = fdt32_to_cpu(fdt->off_dt_struct);
849 off_str = fdt32_to_cpu(fdt->off_dt_strings);
850 off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap);
851 version = fdt32_to_cpu(fdt->version);
852 boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys);
853
854 if (off_mem_rsvmap >= totalsize)
855 die("Mem Reserve structure offset exceeds total size\n");
856
857 if (off_dt >= totalsize)
858 die("DT structure offset exceeds total size\n");
859
860 if (off_str > totalsize)
861 die("String table offset exceeds total size\n");
862
863 if (version >= 3) {
864 uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings);
865 if (off_str+size_str > totalsize)
866 die("String table extends past total size\n");
867 inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str);
868 } else {
869 inbuf_init(&strbuf, blob + off_str, blob + totalsize);
870 }
871
872 if (version >= 17) {
873 size_dt = fdt32_to_cpu(fdt->size_dt_struct);
874 if (off_dt+size_dt > totalsize)
875 die("Structure block extends past total size\n");
876 }
877
878 if (version < 16) {
879 flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN;
880 } else {
881 flags |= FTF_NOPS;
882 }
883
884 inbuf_init(&memresvbuf,
885 blob + off_mem_rsvmap, blob + totalsize);
886 inbuf_init(&dtbuf, blob + off_dt, blob + totalsize);
887
888 reservelist = flat_read_mem_reserve(&memresvbuf);
889
890 val = flat_read_word(&dtbuf);
891
892 if (val != FDT_BEGIN_NODE)
893 die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val);
894
895 tree = unflatten_tree(&dtbuf, &strbuf, "", flags);
896
897 val = flat_read_word(&dtbuf);
898 if (val != FDT_END)
899 die("Device tree blob doesn't end with FDT_END\n");
900
901 free(blob);
902
903 dtc_close_file(dtcf);
904
905 return build_boot_info(reservelist, tree, boot_cpuid_phys);
906 }
907