1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
|
// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
/*
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2006 David Gibson, IBM Corporation.
*/
#include "libfdt_env.h"
#include <fdt.h>
#include <libfdt.h>
#include "libfdt_internal.h"
static int fdt_sw_probe_(void *fdt)
{
if (!can_assume(VALID_INPUT)) {
if (fdt_magic(fdt) == FDT_MAGIC)
return -FDT_ERR_BADSTATE;
else if (fdt_magic(fdt) != FDT_SW_MAGIC)
return -FDT_ERR_BADMAGIC;
}
return 0;
}
#define FDT_SW_PROBE(fdt) \
{ \
int err; \
if ((err = fdt_sw_probe_(fdt)) != 0) \
return err; \
}
/* 'memrsv' state: Initial state after fdt_create()
*
* Allowed functions:
* fdt_add_reservemap_entry()
* fdt_finish_reservemap() [moves to 'struct' state]
*/
static int fdt_sw_probe_memrsv_(void *fdt)
{
int err = fdt_sw_probe_(fdt);
if (err)
return err;
if (!can_assume(VALID_INPUT) && fdt_off_dt_strings(fdt) != 0)
return -FDT_ERR_BADSTATE;
return 0;
}
#define FDT_SW_PROBE_MEMRSV(fdt) \
{ \
int err; \
if ((err = fdt_sw_probe_memrsv_(fdt)) != 0) \
return err; \
}
/* 'struct' state: Enter this state after fdt_finish_reservemap()
*
* Allowed functions:
* fdt_begin_node()
* fdt_end_node()
* fdt_property*()
* fdt_finish() [moves to 'complete' state]
*/
static int fdt_sw_probe_struct_(void *fdt)
{
int err = fdt_sw_probe_(fdt);
if (err)
return err;
if (!can_assume(VALID_INPUT) &&
fdt_off_dt_strings(fdt) != fdt_totalsize(fdt))
return -FDT_ERR_BADSTATE;
return 0;
}
#define FDT_SW_PROBE_STRUCT(fdt) \
{ \
int err; \
if ((err = fdt_sw_probe_struct_(fdt)) != 0) \
return err; \
}
static inline uint32_t sw_flags(void *fdt)
{
/* assert: (fdt_magic(fdt) == FDT_SW_MAGIC) */
return fdt_last_comp_version(fdt);
}
/* 'complete' state: Enter this state after fdt_finish()
*
* Allowed functions: none
*/
static void *fdt_grab_space_(void *fdt, size_t len)
{
unsigned int offset = fdt_size_dt_struct(fdt);
unsigned int spaceleft;
spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
- fdt_size_dt_strings(fdt);
if ((offset + len < offset) || (offset + len > spaceleft))
return NULL;
fdt_set_size_dt_struct(fdt, offset + len);
return fdt_offset_ptr_w_(fdt, offset);
}
int fdt_create_with_flags(void *buf, int bufsize, uint32_t flags)
{
const int hdrsize = FDT_ALIGN(sizeof(struct fdt_header),
sizeof(struct fdt_reserve_entry));
void *fdt = buf;
if (bufsize < hdrsize)
return -FDT_ERR_NOSPACE;
if (flags & ~FDT_CREATE_FLAGS_ALL)
return -FDT_ERR_BADFLAGS;
memset(buf, 0, bufsize);
/*
* magic and last_comp_version keep intermediate state during the fdt
* creation process, which is replaced with the proper FDT format by
* fdt_finish().
*
* flags should be accessed with sw_flags().
*/
fdt_set_magic(fdt, FDT_SW_MAGIC);
fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
fdt_set_last_comp_version(fdt, flags);
fdt_set_totalsize(fdt, bufsize);
fdt_set_off_mem_rsvmap(fdt, hdrsize);
fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
fdt_set_off_dt_strings(fdt, 0);
return 0;
}
int fdt_create(void *buf, int bufsize)
{
return fdt_create_with_flags(buf, bufsize, 0);
}
int fdt_resize(void *fdt, void *buf, int bufsize)
{
size_t headsize, tailsize;
char *oldtail, *newtail;
FDT_SW_PROBE(fdt);
if (bufsize < 0)
return -FDT_ERR_NOSPACE;
headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
tailsize = fdt_size_dt_strings(fdt);
if (!can_assume(VALID_DTB) &&
headsize + tailsize > fdt_totalsize(fdt))
return -FDT_ERR_INTERNAL;
if ((headsize + tailsize) > (unsigned)bufsize)
return -FDT_ERR_NOSPACE;
oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
newtail = (char *)buf + bufsize - tailsize;
/* Two cases to avoid clobbering data if the old and new
* buffers partially overlap */
if (buf <= fdt) {
memmove(buf, fdt, headsize);
memmove(newtail, oldtail, tailsize);
} else {
memmove(newtail, oldtail, tailsize);
memmove(buf, fdt, headsize);
}
fdt_set_totalsize(buf, bufsize);
if (fdt_off_dt_strings(buf))
fdt_set_off_dt_strings(buf, bufsize);
return 0;
}
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
{
struct fdt_reserve_entry *re;
int offset;
FDT_SW_PROBE_MEMRSV(fdt);
offset = fdt_off_dt_struct(fdt);
if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
return -FDT_ERR_NOSPACE;
re = (struct fdt_reserve_entry *)((char *)fdt + offset);
re->address = cpu_to_fdt64(addr);
re->size = cpu_to_fdt64(size);
fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
return 0;
}
int fdt_finish_reservemap(void *fdt)
{
int err = fdt_add_reservemap_entry(fdt, 0, 0);
if (err)
return err;
fdt_set_off_dt_strings(fdt, fdt_totalsize(fdt));
return 0;
}
int fdt_begin_node(void *fdt, const char *name)
{
struct fdt_node_header *nh;
int namelen;
FDT_SW_PROBE_STRUCT(fdt);
namelen = strlen(name) + 1;
nh = fdt_grab_space_(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
if (! nh)
return -FDT_ERR_NOSPACE;
nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
memcpy(nh->name, name, namelen);
return 0;
}
int fdt_end_node(void *fdt)
{
fdt32_t *en;
FDT_SW_PROBE_STRUCT(fdt);
en = fdt_grab_space_(fdt, FDT_TAGSIZE);
if (! en)
return -FDT_ERR_NOSPACE;
*en = cpu_to_fdt32(FDT_END_NODE);
return 0;
}
static int fdt_add_string_(void *fdt, const char *s)
{
char *strtab = (char *)fdt + fdt_totalsize(fdt);
unsigned int strtabsize = fdt_size_dt_strings(fdt);
unsigned int len = strlen(s) + 1;
unsigned int struct_top, offset;
offset = strtabsize + len;
struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
if (fdt_totalsize(fdt) - offset < struct_top)
return 0; /* no more room :( */
memcpy(strtab - offset, s, len);
fdt_set_size_dt_strings(fdt, strtabsize + len);
return -offset;
}
/* Must only be used to roll back in case of error */
static void fdt_del_last_string_(void *fdt, const char *s)
{
int strtabsize = fdt_size_dt_strings(fdt);
int len = strlen(s) + 1;
fdt_set_size_dt_strings(fdt, strtabsize - len);
}
static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
{
char *strtab = (char *)fdt + fdt_totalsize(fdt);
int strtabsize = fdt_size_dt_strings(fdt);
const char *p;
*allocated = 0;
p = fdt_find_string_(strtab - strtabsize, strtabsize, s);
if (p)
return p - strtab;
*allocated = 1;
return fdt_add_string_(fdt, s);
}
int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
{
struct fdt_property *prop;
int nameoff;
int allocated;
FDT_SW_PROBE_STRUCT(fdt);
/* String de-duplication can be slow, _NO_NAME_DEDUP skips it */
if (sw_flags(fdt) & FDT_CREATE_FLAG_NO_NAME_DEDUP) {
allocated = 1;
nameoff = fdt_add_string_(fdt, name);
} else {
nameoff = fdt_find_add_string_(fdt, name, &allocated);
}
if (nameoff == 0)
return -FDT_ERR_NOSPACE;
prop = fdt_grab_space_(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
if (! prop) {
if (allocated)
fdt_del_last_string_(fdt, name);
return -FDT_ERR_NOSPACE;
}
prop->tag = cpu_to_fdt32(FDT_PROP);
prop->nameoff = cpu_to_fdt32(nameoff);
prop->len = cpu_to_fdt32(len);
*valp = prop->data;
return 0;
}
int fdt_property(void *fdt, const char *name, const void *val, int len)
{
void *ptr;
int ret;
ret = fdt_property_placeholder(fdt, name, len, &ptr);
if (ret)
return ret;
memcpy(ptr, val, len);
return 0;
}
int fdt_finish(void *fdt)
{
char *p = (char *)fdt;
fdt32_t *end;
int oldstroffset, newstroffset;
uint32_t tag;
int offset, nextoffset;
FDT_SW_PROBE_STRUCT(fdt);
/* Add terminator */
end = fdt_grab_space_(fdt, sizeof(*end));
if (! end)
return -FDT_ERR_NOSPACE;
*end = cpu_to_fdt32(FDT_END);
/* Relocate the string table */
oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
fdt_set_off_dt_strings(fdt, newstroffset);
/* Walk the structure, correcting string offsets */
offset = 0;
while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
if (tag == FDT_PROP) {
struct fdt_property *prop =
fdt_offset_ptr_w_(fdt, offset);
int nameoff;
nameoff = fdt32_to_cpu(prop->nameoff);
nameoff += fdt_size_dt_strings(fdt);
prop->nameoff = cpu_to_fdt32(nameoff);
}
offset = nextoffset;
}
if (nextoffset < 0)
return nextoffset;
/* Finally, adjust the header */
fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
/* And fix up fields that were keeping intermediate state. */
fdt_set_last_comp_version(fdt, FDT_LAST_COMPATIBLE_VERSION);
fdt_set_magic(fdt, FDT_MAGIC);
return 0;
}
|