Loading...
1/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 *
5 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
7 *
8 * a) This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21 * MA 02110-1301 USA
22 *
23 * Alternatively,
24 *
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
27 * conditions are met:
28 *
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer.
32 * 2. Redistributions in binary form must reproduce the above
33 * copyright notice, this list of conditions and the following
34 * disclaimer in the documentation and/or other materials
35 * provided with the distribution.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50 */
51#include "libfdt_env.h"
52
53#include <fdt.h>
54#include <libfdt.h>
55
56#include "libfdt_internal.h"
57
58int fdt_check_header(const void *fdt)
59{
60 if (fdt_magic(fdt) == FDT_MAGIC) {
61 /* Complete tree */
62 if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
63 return -FDT_ERR_BADVERSION;
64 if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
65 return -FDT_ERR_BADVERSION;
66 } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
67 /* Unfinished sequential-write blob */
68 if (fdt_size_dt_struct(fdt) == 0)
69 return -FDT_ERR_BADSTATE;
70 } else {
71 return -FDT_ERR_BADMAGIC;
72 }
73
74 return 0;
75}
76
77const void *fdt_offset_ptr(const void *fdt, int offset, int len)
78{
79 const char *p;
80
81 if (fdt_version(fdt) >= 0x11)
82 if (((offset + len) < offset)
83 || ((offset + len) > fdt_size_dt_struct(fdt)))
84 return NULL;
85
86 p = _fdt_offset_ptr(fdt, offset);
87
88 if (p + len < p)
89 return NULL;
90 return p;
91}
92
93uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset)
94{
95 const uint32_t *tagp, *lenp;
96 uint32_t tag;
97 const char *p;
98
99 if (offset % FDT_TAGSIZE)
100 return -1;
101
102 tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
103 if (! tagp)
104 return FDT_END; /* premature end */
105 tag = fdt32_to_cpu(*tagp);
106 offset += FDT_TAGSIZE;
107
108 switch (tag) {
109 case FDT_BEGIN_NODE:
110 /* skip name */
111 do {
112 p = fdt_offset_ptr(fdt, offset++, 1);
113 } while (p && (*p != '\0'));
114 if (! p)
115 return FDT_END;
116 break;
117 case FDT_PROP:
118 lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
119 if (! lenp)
120 return FDT_END;
121 /* skip name offset, length and value */
122 offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp);
123 break;
124 }
125
126 if (nextoffset)
127 *nextoffset = FDT_TAGALIGN(offset);
128
129 return tag;
130}
131
132int _fdt_check_node_offset(const void *fdt, int offset)
133{
134 if ((offset < 0) || (offset % FDT_TAGSIZE)
135 || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
136 return -FDT_ERR_BADOFFSET;
137
138 return offset;
139}
140
141int fdt_next_node(const void *fdt, int offset, int *depth)
142{
143 int nextoffset = 0;
144 uint32_t tag;
145
146 if (offset >= 0)
147 if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
148 return nextoffset;
149
150 do {
151 offset = nextoffset;
152 tag = fdt_next_tag(fdt, offset, &nextoffset);
153
154 switch (tag) {
155 case FDT_PROP:
156 case FDT_NOP:
157 break;
158
159 case FDT_BEGIN_NODE:
160 if (depth)
161 (*depth)++;
162 break;
163
164 case FDT_END_NODE:
165 if (depth)
166 (*depth)--;
167 break;
168
169 case FDT_END:
170 return -FDT_ERR_NOTFOUND;
171
172 default:
173 return -FDT_ERR_BADSTRUCTURE;
174 }
175 } while (tag != FDT_BEGIN_NODE);
176
177 return offset;
178}
179
180const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
181{
182 int len = strlen(s) + 1;
183 const char *last = strtab + tabsize - len;
184 const char *p;
185
186 for (p = strtab; p <= last; p++)
187 if (memcmp(p, s, len) == 0)
188 return p;
189 return NULL;
190}
191
192int fdt_move(const void *fdt, void *buf, int bufsize)
193{
194 FDT_CHECK_HEADER(fdt);
195
196 if (fdt_totalsize(fdt) > bufsize)
197 return -FDT_ERR_NOSPACE;
198
199 memmove(buf, fdt, fdt_totalsize(fdt));
200 return 0;
201}
1/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 *
5 * libfdt is dual licensed: you can use it either under the terms of
6 * the GPL, or the BSD license, at your option.
7 *
8 * a) This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21 * MA 02110-1301 USA
22 *
23 * Alternatively,
24 *
25 * b) Redistribution and use in source and binary forms, with or
26 * without modification, are permitted provided that the following
27 * conditions are met:
28 *
29 * 1. Redistributions of source code must retain the above
30 * copyright notice, this list of conditions and the following
31 * disclaimer.
32 * 2. Redistributions in binary form must reproduce the above
33 * copyright notice, this list of conditions and the following
34 * disclaimer in the documentation and/or other materials
35 * provided with the distribution.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50 */
51#include "libfdt_env.h"
52
53#include <fdt.h>
54#include <libfdt.h>
55
56#include "libfdt_internal.h"
57
58int fdt_check_header(const void *fdt)
59{
60 if (fdt_magic(fdt) == FDT_MAGIC) {
61 /* Complete tree */
62 if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
63 return -FDT_ERR_BADVERSION;
64 if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
65 return -FDT_ERR_BADVERSION;
66 } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
67 /* Unfinished sequential-write blob */
68 if (fdt_size_dt_struct(fdt) == 0)
69 return -FDT_ERR_BADSTATE;
70 } else {
71 return -FDT_ERR_BADMAGIC;
72 }
73
74 return 0;
75}
76
77const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
78{
79 unsigned absoffset = offset + fdt_off_dt_struct(fdt);
80
81 if ((absoffset < offset)
82 || ((absoffset + len) < absoffset)
83 || (absoffset + len) > fdt_totalsize(fdt))
84 return NULL;
85
86 if (fdt_version(fdt) >= 0x11)
87 if (((offset + len) < offset)
88 || ((offset + len) > fdt_size_dt_struct(fdt)))
89 return NULL;
90
91 return _fdt_offset_ptr(fdt, offset);
92}
93
94uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
95{
96 const fdt32_t *tagp, *lenp;
97 uint32_t tag;
98 int offset = startoffset;
99 const char *p;
100
101 *nextoffset = -FDT_ERR_TRUNCATED;
102 tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
103 if (!tagp)
104 return FDT_END; /* premature end */
105 tag = fdt32_to_cpu(*tagp);
106 offset += FDT_TAGSIZE;
107
108 *nextoffset = -FDT_ERR_BADSTRUCTURE;
109 switch (tag) {
110 case FDT_BEGIN_NODE:
111 /* skip name */
112 do {
113 p = fdt_offset_ptr(fdt, offset++, 1);
114 } while (p && (*p != '\0'));
115 if (!p)
116 return FDT_END; /* premature end */
117 break;
118
119 case FDT_PROP:
120 lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
121 if (!lenp)
122 return FDT_END; /* premature end */
123 /* skip-name offset, length and value */
124 offset += sizeof(struct fdt_property) - FDT_TAGSIZE
125 + fdt32_to_cpu(*lenp);
126 break;
127
128 case FDT_END:
129 case FDT_END_NODE:
130 case FDT_NOP:
131 break;
132
133 default:
134 return FDT_END;
135 }
136
137 if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
138 return FDT_END; /* premature end */
139
140 *nextoffset = FDT_TAGALIGN(offset);
141 return tag;
142}
143
144int _fdt_check_node_offset(const void *fdt, int offset)
145{
146 if ((offset < 0) || (offset % FDT_TAGSIZE)
147 || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
148 return -FDT_ERR_BADOFFSET;
149
150 return offset;
151}
152
153int _fdt_check_prop_offset(const void *fdt, int offset)
154{
155 if ((offset < 0) || (offset % FDT_TAGSIZE)
156 || (fdt_next_tag(fdt, offset, &offset) != FDT_PROP))
157 return -FDT_ERR_BADOFFSET;
158
159 return offset;
160}
161
162int fdt_next_node(const void *fdt, int offset, int *depth)
163{
164 int nextoffset = 0;
165 uint32_t tag;
166
167 if (offset >= 0)
168 if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
169 return nextoffset;
170
171 do {
172 offset = nextoffset;
173 tag = fdt_next_tag(fdt, offset, &nextoffset);
174
175 switch (tag) {
176 case FDT_PROP:
177 case FDT_NOP:
178 break;
179
180 case FDT_BEGIN_NODE:
181 if (depth)
182 (*depth)++;
183 break;
184
185 case FDT_END_NODE:
186 if (depth && ((--(*depth)) < 0))
187 return nextoffset;
188 break;
189
190 case FDT_END:
191 if ((nextoffset >= 0)
192 || ((nextoffset == -FDT_ERR_TRUNCATED) && !depth))
193 return -FDT_ERR_NOTFOUND;
194 else
195 return nextoffset;
196 }
197 } while (tag != FDT_BEGIN_NODE);
198
199 return offset;
200}
201
202int fdt_first_subnode(const void *fdt, int offset)
203{
204 int depth = 0;
205
206 offset = fdt_next_node(fdt, offset, &depth);
207 if (offset < 0 || depth != 1)
208 return -FDT_ERR_NOTFOUND;
209
210 return offset;
211}
212
213int fdt_next_subnode(const void *fdt, int offset)
214{
215 int depth = 1;
216
217 /*
218 * With respect to the parent, the depth of the next subnode will be
219 * the same as the last.
220 */
221 do {
222 offset = fdt_next_node(fdt, offset, &depth);
223 if (offset < 0 || depth < 1)
224 return -FDT_ERR_NOTFOUND;
225 } while (depth > 1);
226
227 return offset;
228}
229
230const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
231{
232 int len = strlen(s) + 1;
233 const char *last = strtab + tabsize - len;
234 const char *p;
235
236 for (p = strtab; p <= last; p++)
237 if (memcmp(p, s, len) == 0)
238 return p;
239 return NULL;
240}
241
242int fdt_move(const void *fdt, void *buf, int bufsize)
243{
244 FDT_CHECK_HEADER(fdt);
245
246 if (fdt_totalsize(fdt) > bufsize)
247 return -FDT_ERR_NOSPACE;
248
249 memmove(buf, fdt, fdt_totalsize(fdt));
250 return 0;
251}