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 *, const char *, int);
53 void (*align)(void *, int);
54 void (*data)(void *, struct data);
55 void (*beginnode)(void *, struct label *labels);
56 void (*endnode)(void *, struct label *labels);
57 void (*property)(void *, struct label *labels);
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,const char * str,int len)67 static void bin_emit_string(void *e, const 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,struct label * labels)92 static void bin_emit_beginnode(void *e, struct label *labels)
93 {
94 bin_emit_cell(e, FDT_BEGIN_NODE);
95 }
96
bin_emit_endnode(void * e,struct label * labels)97 static void bin_emit_endnode(void *e, struct label *labels)
98 {
99 bin_emit_cell(e, FDT_END_NODE);
100 }
101
bin_emit_property(void * e,struct label * labels)102 static void bin_emit_property(void *e, struct label *labels)
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
130 #define ASM_EMIT_BELONG(f, fmt, ...) \
131 { \
132 fprintf((f), "\t.byte\t((" fmt ") >> 24) & 0xff\n", __VA_ARGS__); \
133 fprintf((f), "\t.byte\t((" fmt ") >> 16) & 0xff\n", __VA_ARGS__); \
134 fprintf((f), "\t.byte\t((" fmt ") >> 8) & 0xff\n", __VA_ARGS__); \
135 fprintf((f), "\t.byte\t(" fmt ") & 0xff\n", __VA_ARGS__); \
136 }
137
asm_emit_cell(void * e,cell_t val)138 static void asm_emit_cell(void *e, cell_t val)
139 {
140 FILE *f = e;
141
142 fprintf(f, "\t.byte 0x%02x; .byte 0x%02x; .byte 0x%02x; .byte 0x%02x\n",
143 (val >> 24) & 0xff, (val >> 16) & 0xff,
144 (val >> 8) & 0xff, val & 0xff);
145 }
146
asm_emit_string(void * e,const char * str,int len)147 static void asm_emit_string(void *e, const char *str, int len)
148 {
149 FILE *f = e;
150
151 if (len != 0)
152 fprintf(f, "\t.string\t\"%.*s\"\n", len, str);
153 else
154 fprintf(f, "\t.string\t\"%s\"\n", str);
155 }
156
asm_emit_align(void * e,int a)157 static void asm_emit_align(void *e, int a)
158 {
159 FILE *f = e;
160
161 fprintf(f, "\t.balign\t%d, 0\n", a);
162 }
163
asm_emit_data(void * e,struct data d)164 static void asm_emit_data(void *e, struct data d)
165 {
166 FILE *f = e;
167 int off = 0;
168 struct marker *m = d.markers;
169
170 for_each_marker_of_type(m, LABEL)
171 emit_offset_label(f, m->ref, m->offset);
172
173 while ((d.len - off) >= sizeof(uint32_t)) {
174 asm_emit_cell(e, fdt32_to_cpu(*((fdt32_t *)(d.val+off))));
175 off += sizeof(uint32_t);
176 }
177
178 while ((d.len - off) >= 1) {
179 fprintf(f, "\t.byte\t0x%hhx\n", d.val[off]);
180 off += 1;
181 }
182
183 assert(off == d.len);
184 }
185
asm_emit_beginnode(void * e,struct label * labels)186 static void asm_emit_beginnode(void *e, struct label *labels)
187 {
188 FILE *f = e;
189 struct label *l;
190
191 for_each_label(labels, l) {
192 fprintf(f, "\t.globl\t%s\n", l->label);
193 fprintf(f, "%s:\n", l->label);
194 }
195 fprintf(f, "\t/* FDT_BEGIN_NODE */\n");
196 asm_emit_cell(e, FDT_BEGIN_NODE);
197 }
198
asm_emit_endnode(void * e,struct label * labels)199 static void asm_emit_endnode(void *e, struct label *labels)
200 {
201 FILE *f = e;
202 struct label *l;
203
204 fprintf(f, "\t/* FDT_END_NODE */\n");
205 asm_emit_cell(e, FDT_END_NODE);
206 for_each_label(labels, l) {
207 fprintf(f, "\t.globl\t%s_end\n", l->label);
208 fprintf(f, "%s_end:\n", l->label);
209 }
210 }
211
asm_emit_property(void * e,struct label * labels)212 static void asm_emit_property(void *e, struct label *labels)
213 {
214 FILE *f = e;
215 struct label *l;
216
217 for_each_label(labels, l) {
218 fprintf(f, "\t.globl\t%s\n", l->label);
219 fprintf(f, "%s:\n", l->label);
220 }
221 fprintf(f, "\t/* FDT_PROP */\n");
222 asm_emit_cell(e, FDT_PROP);
223 }
224
225 static struct emitter asm_emitter = {
226 .cell = asm_emit_cell,
227 .string = asm_emit_string,
228 .align = asm_emit_align,
229 .data = asm_emit_data,
230 .beginnode = asm_emit_beginnode,
231 .endnode = asm_emit_endnode,
232 .property = asm_emit_property,
233 };
234
stringtable_insert(struct data * d,const char * str)235 static int stringtable_insert(struct data *d, const char *str)
236 {
237 int i;
238
239 /* FIXME: do this more efficiently? */
240
241 for (i = 0; i < d->len; i++) {
242 if (streq(str, d->val + i))
243 return i;
244 }
245
246 *d = data_append_data(*d, str, strlen(str)+1);
247 return i;
248 }
249
flatten_tree(struct node * tree,struct emitter * emit,void * etarget,struct data * strbuf,struct version_info * vi)250 static void flatten_tree(struct node *tree, struct emitter *emit,
251 void *etarget, struct data *strbuf,
252 struct version_info *vi)
253 {
254 struct property *prop;
255 struct node *child;
256 bool seen_name_prop = false;
257
258 if (tree->deleted)
259 return;
260
261 emit->beginnode(etarget, tree->labels);
262
263 if (vi->flags & FTF_FULLPATH)
264 emit->string(etarget, tree->fullpath, 0);
265 else
266 emit->string(etarget, tree->name, 0);
267
268 emit->align(etarget, sizeof(cell_t));
269
270 for_each_property(tree, prop) {
271 int nameoff;
272
273 if (streq(prop->name, "name"))
274 seen_name_prop = true;
275
276 nameoff = stringtable_insert(strbuf, prop->name);
277
278 emit->property(etarget, prop->labels);
279 emit->cell(etarget, prop->val.len);
280 emit->cell(etarget, nameoff);
281
282 if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8))
283 emit->align(etarget, 8);
284
285 emit->data(etarget, prop->val);
286 emit->align(etarget, sizeof(cell_t));
287 }
288
289 if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) {
290 emit->property(etarget, NULL);
291 emit->cell(etarget, tree->basenamelen+1);
292 emit->cell(etarget, stringtable_insert(strbuf, "name"));
293
294 if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8))
295 emit->align(etarget, 8);
296
297 emit->string(etarget, tree->name, tree->basenamelen);
298 emit->align(etarget, sizeof(cell_t));
299 }
300
301 for_each_child(tree, child) {
302 flatten_tree(child, emit, etarget, strbuf, vi);
303 }
304
305 emit->endnode(etarget, tree->labels);
306 }
307
flatten_reserve_list(struct reserve_info * reservelist,struct version_info * vi)308 static struct data flatten_reserve_list(struct reserve_info *reservelist,
309 struct version_info *vi)
310 {
311 struct reserve_info *re;
312 struct data d = empty_data;
313 int j;
314
315 for (re = reservelist; re; re = re->next) {
316 d = data_append_re(d, re->address, re->size);
317 }
318 /*
319 * Add additional reserved slots if the user asked for them.
320 */
321 for (j = 0; j < reservenum; j++) {
322 d = data_append_re(d, 0, 0);
323 }
324
325 return d;
326 }
327
make_fdt_header(struct fdt_header * fdt,struct version_info * vi,int reservesize,int dtsize,int strsize,int boot_cpuid_phys)328 static void make_fdt_header(struct fdt_header *fdt,
329 struct version_info *vi,
330 int reservesize, int dtsize, int strsize,
331 int boot_cpuid_phys)
332 {
333 int reserve_off;
334
335 reservesize += sizeof(struct fdt_reserve_entry);
336
337 memset(fdt, 0xff, sizeof(*fdt));
338
339 fdt->magic = cpu_to_fdt32(FDT_MAGIC);
340 fdt->version = cpu_to_fdt32(vi->version);
341 fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version);
342
343 /* Reserve map should be doubleword aligned */
344 reserve_off = ALIGN(vi->hdr_size, 8);
345
346 fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off);
347 fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize);
348 fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize
349 + dtsize);
350 fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize);
351
352 if (vi->flags & FTF_BOOTCPUID)
353 fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys);
354 if (vi->flags & FTF_STRTABSIZE)
355 fdt->size_dt_strings = cpu_to_fdt32(strsize);
356 if (vi->flags & FTF_STRUCTSIZE)
357 fdt->size_dt_struct = cpu_to_fdt32(dtsize);
358 }
359
dt_to_blob(FILE * f,struct dt_info * dti,int version)360 void dt_to_blob(FILE *f, struct dt_info *dti, int version)
361 {
362 struct version_info *vi = NULL;
363 int i;
364 struct data blob = empty_data;
365 struct data reservebuf = empty_data;
366 struct data dtbuf = empty_data;
367 struct data strbuf = empty_data;
368 struct fdt_header fdt;
369 int padlen = 0;
370
371 for (i = 0; i < ARRAY_SIZE(version_table); i++) {
372 if (version_table[i].version == version)
373 vi = &version_table[i];
374 }
375 if (!vi)
376 die("Unknown device tree blob version %d\n", version);
377
378 flatten_tree(dti->dt, &bin_emitter, &dtbuf, &strbuf, vi);
379 bin_emit_cell(&dtbuf, FDT_END);
380
381 reservebuf = flatten_reserve_list(dti->reservelist, vi);
382
383 /* Make header */
384 make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len,
385 dti->boot_cpuid_phys);
386
387 /*
388 * If the user asked for more space than is used, adjust the totalsize.
389 */
390 if (minsize > 0) {
391 padlen = minsize - fdt32_to_cpu(fdt.totalsize);
392 if (padlen < 0) {
393 padlen = 0;
394 if (quiet < 1)
395 fprintf(stderr,
396 "Warning: blob size %d >= minimum size %d\n",
397 fdt32_to_cpu(fdt.totalsize), minsize);
398 }
399 }
400
401 if (padsize > 0)
402 padlen = padsize;
403
404 if (alignsize > 0)
405 padlen = ALIGN(fdt32_to_cpu(fdt.totalsize) + padlen, alignsize)
406 - fdt32_to_cpu(fdt.totalsize);
407
408 if (padlen > 0) {
409 int tsize = fdt32_to_cpu(fdt.totalsize);
410 tsize += padlen;
411 fdt.totalsize = cpu_to_fdt32(tsize);
412 }
413
414 /*
415 * Assemble the blob: start with the header, add with alignment
416 * the reserve buffer, add the reserve map terminating zeroes,
417 * the device tree itself, and finally the strings.
418 */
419 blob = data_append_data(blob, &fdt, vi->hdr_size);
420 blob = data_append_align(blob, 8);
421 blob = data_merge(blob, reservebuf);
422 blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry));
423 blob = data_merge(blob, dtbuf);
424 blob = data_merge(blob, strbuf);
425
426 /*
427 * If the user asked for more space than is used, pad out the blob.
428 */
429 if (padlen > 0)
430 blob = data_append_zeroes(blob, padlen);
431
432 if (fwrite(blob.val, blob.len, 1, f) != 1) {
433 if (ferror(f))
434 die("Error writing device tree blob: %s\n",
435 strerror(errno));
436 else
437 die("Short write on device tree blob\n");
438 }
439
440 /*
441 * data_merge() frees the right-hand element so only the blob
442 * remains to be freed.
443 */
444 data_free(blob);
445 }
446
dump_stringtable_asm(FILE * f,struct data strbuf)447 static void dump_stringtable_asm(FILE *f, struct data strbuf)
448 {
449 const char *p;
450 int len;
451
452 p = strbuf.val;
453
454 while (p < (strbuf.val + strbuf.len)) {
455 len = strlen(p);
456 fprintf(f, "\t.string \"%s\"\n", p);
457 p += len+1;
458 }
459 }
460
dt_to_asm(FILE * f,struct dt_info * dti,int version)461 void dt_to_asm(FILE *f, struct dt_info *dti, int version)
462 {
463 struct version_info *vi = NULL;
464 int i;
465 struct data strbuf = empty_data;
466 struct reserve_info *re;
467 const char *symprefix = "dt";
468
469 for (i = 0; i < ARRAY_SIZE(version_table); i++) {
470 if (version_table[i].version == version)
471 vi = &version_table[i];
472 }
473 if (!vi)
474 die("Unknown device tree blob version %d\n", version);
475
476 fprintf(f, "/* autogenerated by dtc, do not edit */\n\n");
477
478 emit_label(f, symprefix, "blob_start");
479 emit_label(f, symprefix, "header");
480 fprintf(f, "\t/* magic */\n");
481 asm_emit_cell(f, FDT_MAGIC);
482 fprintf(f, "\t/* totalsize */\n");
483 ASM_EMIT_BELONG(f, "_%s_blob_abs_end - _%s_blob_start",
484 symprefix, symprefix);
485 fprintf(f, "\t/* off_dt_struct */\n");
486 ASM_EMIT_BELONG(f, "_%s_struct_start - _%s_blob_start",
487 symprefix, symprefix);
488 fprintf(f, "\t/* off_dt_strings */\n");
489 ASM_EMIT_BELONG(f, "_%s_strings_start - _%s_blob_start",
490 symprefix, symprefix);
491 fprintf(f, "\t/* off_mem_rsvmap */\n");
492 ASM_EMIT_BELONG(f, "_%s_reserve_map - _%s_blob_start",
493 symprefix, symprefix);
494 fprintf(f, "\t/* version */\n");
495 asm_emit_cell(f, vi->version);
496 fprintf(f, "\t/* last_comp_version */\n");
497 asm_emit_cell(f, vi->last_comp_version);
498
499 if (vi->flags & FTF_BOOTCPUID) {
500 fprintf(f, "\t/* boot_cpuid_phys */\n");
501 asm_emit_cell(f, dti->boot_cpuid_phys);
502 }
503
504 if (vi->flags & FTF_STRTABSIZE) {
505 fprintf(f, "\t/* size_dt_strings */\n");
506 ASM_EMIT_BELONG(f, "_%s_strings_end - _%s_strings_start",
507 symprefix, symprefix);
508 }
509
510 if (vi->flags & FTF_STRUCTSIZE) {
511 fprintf(f, "\t/* size_dt_struct */\n");
512 ASM_EMIT_BELONG(f, "_%s_struct_end - _%s_struct_start",
513 symprefix, symprefix);
514 }
515
516 /*
517 * Reserve map entries.
518 * Align the reserve map to a doubleword boundary.
519 * Each entry is an (address, size) pair of u64 values.
520 * Always supply a zero-sized temination entry.
521 */
522 asm_emit_align(f, 8);
523 emit_label(f, symprefix, "reserve_map");
524
525 fprintf(f, "/* Memory reserve map from source file */\n");
526
527 /*
528 * Use .long on high and low halfs of u64s to avoid .quad
529 * as it appears .quad isn't available in some assemblers.
530 */
531 for (re = dti->reservelist; re; re = re->next) {
532 struct label *l;
533
534 for_each_label(re->labels, l) {
535 fprintf(f, "\t.globl\t%s\n", l->label);
536 fprintf(f, "%s:\n", l->label);
537 }
538 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->address >> 32));
539 ASM_EMIT_BELONG(f, "0x%08x",
540 (unsigned int)(re->address & 0xffffffff));
541 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size >> 32));
542 ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->size & 0xffffffff));
543 }
544 for (i = 0; i < reservenum; i++) {
545 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");
546 }
547
548 fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n");
549
550 emit_label(f, symprefix, "struct_start");
551 flatten_tree(dti->dt, &asm_emitter, f, &strbuf, vi);
552
553 fprintf(f, "\t/* FDT_END */\n");
554 asm_emit_cell(f, FDT_END);
555 emit_label(f, symprefix, "struct_end");
556
557 emit_label(f, symprefix, "strings_start");
558 dump_stringtable_asm(f, strbuf);
559 emit_label(f, symprefix, "strings_end");
560
561 emit_label(f, symprefix, "blob_end");
562
563 /*
564 * If the user asked for more space than is used, pad it out.
565 */
566 if (minsize > 0) {
567 fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n",
568 minsize, symprefix, symprefix);
569 }
570 if (padsize > 0) {
571 fprintf(f, "\t.space\t%d, 0\n", padsize);
572 }
573 if (alignsize > 0)
574 asm_emit_align(f, alignsize);
575 emit_label(f, symprefix, "blob_abs_end");
576
577 data_free(strbuf);
578 }
579
580 struct inbuf {
581 char *base, *limit, *ptr;
582 };
583
inbuf_init(struct inbuf * inb,void * base,void * limit)584 static void inbuf_init(struct inbuf *inb, void *base, void *limit)
585 {
586 inb->base = base;
587 inb->limit = limit;
588 inb->ptr = inb->base;
589 }
590
flat_read_chunk(struct inbuf * inb,void * p,int len)591 static void flat_read_chunk(struct inbuf *inb, void *p, int len)
592 {
593 if ((inb->ptr + len) > inb->limit)
594 die("Premature end of data parsing flat device tree\n");
595
596 memcpy(p, inb->ptr, len);
597
598 inb->ptr += len;
599 }
600
flat_read_word(struct inbuf * inb)601 static uint32_t flat_read_word(struct inbuf *inb)
602 {
603 fdt32_t val;
604
605 assert(((inb->ptr - inb->base) % sizeof(val)) == 0);
606
607 flat_read_chunk(inb, &val, sizeof(val));
608
609 return fdt32_to_cpu(val);
610 }
611
flat_realign(struct inbuf * inb,int align)612 static void flat_realign(struct inbuf *inb, int align)
613 {
614 int off = inb->ptr - inb->base;
615
616 inb->ptr = inb->base + ALIGN(off, align);
617 if (inb->ptr > inb->limit)
618 die("Premature end of data parsing flat device tree\n");
619 }
620
flat_read_string(struct inbuf * inb)621 static char *flat_read_string(struct inbuf *inb)
622 {
623 int len = 0;
624 const char *p = inb->ptr;
625 char *str;
626
627 do {
628 if (p >= inb->limit)
629 die("Premature end of data parsing flat device tree\n");
630 len++;
631 } while ((*p++) != '\0');
632
633 str = xstrdup(inb->ptr);
634
635 inb->ptr += len;
636
637 flat_realign(inb, sizeof(uint32_t));
638
639 return str;
640 }
641
flat_read_data(struct inbuf * inb,int len)642 static struct data flat_read_data(struct inbuf *inb, int len)
643 {
644 struct data d = empty_data;
645
646 if (len == 0)
647 return empty_data;
648
649 d = data_grow_for(d, len);
650 d.len = len;
651
652 flat_read_chunk(inb, d.val, len);
653
654 flat_realign(inb, sizeof(uint32_t));
655
656 return d;
657 }
658
flat_read_stringtable(struct inbuf * inb,int offset)659 static char *flat_read_stringtable(struct inbuf *inb, int offset)
660 {
661 const char *p;
662
663 p = inb->base + offset;
664 while (1) {
665 if (p >= inb->limit || p < inb->base)
666 die("String offset %d overruns string table\n",
667 offset);
668
669 if (*p == '\0')
670 break;
671
672 p++;
673 }
674
675 return xstrdup(inb->base + offset);
676 }
677
flat_read_property(struct inbuf * dtbuf,struct inbuf * strbuf,int flags)678 static struct property *flat_read_property(struct inbuf *dtbuf,
679 struct inbuf *strbuf, int flags)
680 {
681 uint32_t proplen, stroff;
682 char *name;
683 struct data val;
684
685 proplen = flat_read_word(dtbuf);
686 stroff = flat_read_word(dtbuf);
687
688 name = flat_read_stringtable(strbuf, stroff);
689
690 if ((flags & FTF_VARALIGN) && (proplen >= 8))
691 flat_realign(dtbuf, 8);
692
693 val = flat_read_data(dtbuf, proplen);
694
695 return build_property(name, val);
696 }
697
698
flat_read_mem_reserve(struct inbuf * inb)699 static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb)
700 {
701 struct reserve_info *reservelist = NULL;
702 struct reserve_info *new;
703 struct fdt_reserve_entry re;
704
705 /*
706 * Each entry is a pair of u64 (addr, size) values for 4 cell_t's.
707 * List terminates at an entry with size equal to zero.
708 *
709 * First pass, count entries.
710 */
711 while (1) {
712 uint64_t address, size;
713
714 flat_read_chunk(inb, &re, sizeof(re));
715 address = fdt64_to_cpu(re.address);
716 size = fdt64_to_cpu(re.size);
717 if (size == 0)
718 break;
719
720 new = build_reserve_entry(address, size);
721 reservelist = add_reserve_entry(reservelist, new);
722 }
723
724 return reservelist;
725 }
726
727
nodename_from_path(const char * ppath,const char * cpath)728 static char *nodename_from_path(const char *ppath, const char *cpath)
729 {
730 int plen;
731
732 plen = strlen(ppath);
733
734 if (!strneq(ppath, cpath, plen))
735 die("Path \"%s\" is not valid as a child of \"%s\"\n",
736 cpath, ppath);
737
738 /* root node is a special case */
739 if (!streq(ppath, "/"))
740 plen++;
741
742 return xstrdup(cpath + plen);
743 }
744
unflatten_tree(struct inbuf * dtbuf,struct inbuf * strbuf,const char * parent_flatname,int flags)745 static struct node *unflatten_tree(struct inbuf *dtbuf,
746 struct inbuf *strbuf,
747 const char *parent_flatname, int flags)
748 {
749 struct node *node;
750 char *flatname;
751 uint32_t val;
752
753 node = build_node(NULL, NULL);
754
755 flatname = flat_read_string(dtbuf);
756
757 if (flags & FTF_FULLPATH)
758 node->name = nodename_from_path(parent_flatname, flatname);
759 else
760 node->name = flatname;
761
762 do {
763 struct property *prop;
764 struct node *child;
765
766 val = flat_read_word(dtbuf);
767 switch (val) {
768 case FDT_PROP:
769 if (node->children)
770 fprintf(stderr, "Warning: Flat tree input has "
771 "subnodes preceding a property.\n");
772 prop = flat_read_property(dtbuf, strbuf, flags);
773 add_property(node, prop);
774 break;
775
776 case FDT_BEGIN_NODE:
777 child = unflatten_tree(dtbuf,strbuf, flatname, flags);
778 add_child(node, child);
779 break;
780
781 case FDT_END_NODE:
782 break;
783
784 case FDT_END:
785 die("Premature FDT_END in device tree blob\n");
786 break;
787
788 case FDT_NOP:
789 if (!(flags & FTF_NOPS))
790 fprintf(stderr, "Warning: NOP tag found in flat tree"
791 " version <16\n");
792
793 /* Ignore */
794 break;
795
796 default:
797 die("Invalid opcode word %08x in device tree blob\n",
798 val);
799 }
800 } while (val != FDT_END_NODE);
801
802 if (node->name != flatname) {
803 free(flatname);
804 }
805
806 return node;
807 }
808
809
dt_from_blob(const char * fname)810 struct dt_info *dt_from_blob(const char *fname)
811 {
812 FILE *f;
813 fdt32_t magic_buf, totalsize_buf;
814 uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys;
815 uint32_t off_dt, off_str, off_mem_rsvmap;
816 int rc;
817 char *blob;
818 struct fdt_header *fdt;
819 char *p;
820 struct inbuf dtbuf, strbuf;
821 struct inbuf memresvbuf;
822 int sizeleft;
823 struct reserve_info *reservelist;
824 struct node *tree;
825 uint32_t val;
826 int flags = 0;
827
828 f = srcfile_relative_open(fname, NULL);
829
830 rc = fread(&magic_buf, sizeof(magic_buf), 1, f);
831 if (ferror(f))
832 die("Error reading DT blob magic number: %s\n",
833 strerror(errno));
834 if (rc < 1) {
835 if (feof(f))
836 die("EOF reading DT blob magic number\n");
837 else
838 die("Mysterious short read reading magic number\n");
839 }
840
841 magic = fdt32_to_cpu(magic_buf);
842 if (magic != FDT_MAGIC)
843 die("Blob has incorrect magic number\n");
844
845 rc = fread(&totalsize_buf, sizeof(totalsize_buf), 1, f);
846 if (ferror(f))
847 die("Error reading DT blob size: %s\n", strerror(errno));
848 if (rc < 1) {
849 if (feof(f))
850 die("EOF reading DT blob size\n");
851 else
852 die("Mysterious short read reading blob size\n");
853 }
854
855 totalsize = fdt32_to_cpu(totalsize_buf);
856 if (totalsize < FDT_V1_SIZE)
857 die("DT blob size (%d) is too small\n", totalsize);
858
859 blob = xmalloc(totalsize);
860
861 fdt = (struct fdt_header *)blob;
862 fdt->magic = cpu_to_fdt32(magic);
863 fdt->totalsize = cpu_to_fdt32(totalsize);
864
865 sizeleft = totalsize - sizeof(magic) - sizeof(totalsize);
866 p = blob + sizeof(magic) + sizeof(totalsize);
867
868 while (sizeleft) {
869 if (feof(f))
870 die("EOF before reading %d bytes of DT blob\n",
871 totalsize);
872
873 rc = fread(p, 1, sizeleft, f);
874 if (ferror(f))
875 die("Error reading DT blob: %s\n",
876 strerror(errno));
877
878 sizeleft -= rc;
879 p += rc;
880 }
881
882 off_dt = fdt32_to_cpu(fdt->off_dt_struct);
883 off_str = fdt32_to_cpu(fdt->off_dt_strings);
884 off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap);
885 version = fdt32_to_cpu(fdt->version);
886 boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys);
887
888 if (off_mem_rsvmap >= totalsize)
889 die("Mem Reserve structure offset exceeds total size\n");
890
891 if (off_dt >= totalsize)
892 die("DT structure offset exceeds total size\n");
893
894 if (off_str > totalsize)
895 die("String table offset exceeds total size\n");
896
897 if (version >= 3) {
898 uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings);
899 if ((off_str+size_str < off_str) || (off_str+size_str > totalsize))
900 die("String table extends past total size\n");
901 inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str);
902 } else {
903 inbuf_init(&strbuf, blob + off_str, blob + totalsize);
904 }
905
906 if (version >= 17) {
907 size_dt = fdt32_to_cpu(fdt->size_dt_struct);
908 if ((off_dt+size_dt < off_dt) || (off_dt+size_dt > totalsize))
909 die("Structure block extends past total size\n");
910 }
911
912 if (version < 16) {
913 flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN;
914 } else {
915 flags |= FTF_NOPS;
916 }
917
918 inbuf_init(&memresvbuf,
919 blob + off_mem_rsvmap, blob + totalsize);
920 inbuf_init(&dtbuf, blob + off_dt, blob + totalsize);
921
922 reservelist = flat_read_mem_reserve(&memresvbuf);
923
924 val = flat_read_word(&dtbuf);
925
926 if (val != FDT_BEGIN_NODE)
927 die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val);
928
929 tree = unflatten_tree(&dtbuf, &strbuf, "", flags);
930
931 val = flat_read_word(&dtbuf);
932 if (val != FDT_END)
933 die("Device tree blob doesn't end with FDT_END\n");
934
935 free(blob);
936
937 fclose(f);
938
939 return build_dt_info(DTSF_V1, reservelist, tree, boot_cpuid_phys);
940 }
941