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Gerald Van Baren35748172007-03-31 12:00:56 -04001/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
Roger Meier35084762013-07-27 01:12:38 +02004 * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause
Gerald Van Baren35748172007-03-31 12:00:56 -04005 */
6#include "libfdt_env.h"
7
8#include <fdt.h>
9#include <libfdt.h>
10
11#include "libfdt_internal.h"
12
David Gibsonfc7758e2008-07-09 14:10:24 +100013static int _fdt_sw_check_header(void *fdt)
Gerald Van Baren35748172007-03-31 12:00:56 -040014{
David Gibsonfc7758e2008-07-09 14:10:24 +100015 if (fdt_magic(fdt) != FDT_SW_MAGIC)
Gerald Van Baren35748172007-03-31 12:00:56 -040016 return -FDT_ERR_BADMAGIC;
David Gibson2f08bfa2008-05-20 17:19:11 +100017 /* FIXME: should check more details about the header state */
Gerald Van Baren35748172007-03-31 12:00:56 -040018 return 0;
19}
20
David Gibsonfc7758e2008-07-09 14:10:24 +100021#define FDT_SW_CHECK_HEADER(fdt) \
David Gibson2f08bfa2008-05-20 17:19:11 +100022 { \
23 int err; \
David Gibsonfc7758e2008-07-09 14:10:24 +100024 if ((err = _fdt_sw_check_header(fdt)) != 0) \
David Gibson2f08bfa2008-05-20 17:19:11 +100025 return err; \
26 }
27
Emil Medve13d93f32009-02-23 10:43:36 -060028static void *_fdt_grab_space(void *fdt, size_t len)
Gerald Van Baren35748172007-03-31 12:00:56 -040029{
30 int offset = fdt_size_dt_struct(fdt);
31 int spaceleft;
32
33 spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
34 - fdt_size_dt_strings(fdt);
35
36 if ((offset + len < offset) || (offset + len > spaceleft))
37 return NULL;
38
Kumar Gala8d04f022007-10-24 11:04:22 -050039 fdt_set_size_dt_struct(fdt, offset + len);
David Gibsona22d9cf2009-02-06 14:03:24 +110040 return _fdt_offset_ptr_w(fdt, offset);
Gerald Van Baren35748172007-03-31 12:00:56 -040041}
42
43int fdt_create(void *buf, int bufsize)
44{
45 void *fdt = buf;
46
47 if (bufsize < sizeof(struct fdt_header))
48 return -FDT_ERR_NOSPACE;
49
50 memset(buf, 0, bufsize);
51
David Gibsonfc7758e2008-07-09 14:10:24 +100052 fdt_set_magic(fdt, FDT_SW_MAGIC);
Kumar Gala8d04f022007-10-24 11:04:22 -050053 fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
54 fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION);
55 fdt_set_totalsize(fdt, bufsize);
Gerald Van Baren35748172007-03-31 12:00:56 -040056
David Gibsonfc7758e2008-07-09 14:10:24 +100057 fdt_set_off_mem_rsvmap(fdt, FDT_ALIGN(sizeof(struct fdt_header),
58 sizeof(struct fdt_reserve_entry)));
Kumar Gala8d04f022007-10-24 11:04:22 -050059 fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
60 fdt_set_off_dt_strings(fdt, bufsize);
Gerald Van Baren35748172007-03-31 12:00:56 -040061
62 return 0;
63}
64
Simon Glass0596d352014-07-30 03:59:03 -060065int fdt_resize(void *fdt, void *buf, int bufsize)
66{
67 size_t headsize, tailsize;
68 char *oldtail, *newtail;
69
70 FDT_SW_CHECK_HEADER(fdt);
71
72 headsize = fdt_off_dt_struct(fdt);
73 tailsize = fdt_size_dt_strings(fdt);
74
75 if ((headsize + tailsize) > bufsize)
76 return -FDT_ERR_NOSPACE;
77
78 oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
79 newtail = (char *)buf + bufsize - tailsize;
80
81 /* Two cases to avoid clobbering data if the old and new
82 * buffers partially overlap */
83 if (buf <= fdt) {
84 memmove(buf, fdt, headsize);
85 memmove(newtail, oldtail, tailsize);
86 } else {
87 memmove(newtail, oldtail, tailsize);
88 memmove(buf, fdt, headsize);
89 }
90
91 fdt_set_off_dt_strings(buf, bufsize);
92 fdt_set_totalsize(buf, bufsize);
93
94 return 0;
95}
96
Gerald Van Baren35748172007-03-31 12:00:56 -040097int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
98{
99 struct fdt_reserve_entry *re;
Gerald Van Baren35748172007-03-31 12:00:56 -0400100 int offset;
101
David Gibsonfc7758e2008-07-09 14:10:24 +1000102 FDT_SW_CHECK_HEADER(fdt);
David Gibson2f08bfa2008-05-20 17:19:11 +1000103
Gerald Van Baren35748172007-03-31 12:00:56 -0400104 if (fdt_size_dt_struct(fdt))
105 return -FDT_ERR_BADSTATE;
106
107 offset = fdt_off_dt_struct(fdt);
108 if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
109 return -FDT_ERR_NOSPACE;
110
David Gibsonef4e8ce2008-07-07 10:10:48 +1000111 re = (struct fdt_reserve_entry *)((char *)fdt + offset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400112 re->address = cpu_to_fdt64(addr);
113 re->size = cpu_to_fdt64(size);
114
Kumar Gala8d04f022007-10-24 11:04:22 -0500115 fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
Gerald Van Baren35748172007-03-31 12:00:56 -0400116
117 return 0;
118}
119
120int fdt_finish_reservemap(void *fdt)
121{
122 return fdt_add_reservemap_entry(fdt, 0, 0);
123}
124
125int fdt_begin_node(void *fdt, const char *name)
126{
127 struct fdt_node_header *nh;
Gerald Van Baren35748172007-03-31 12:00:56 -0400128 int namelen = strlen(name) + 1;
129
David Gibsonfc7758e2008-07-09 14:10:24 +1000130 FDT_SW_CHECK_HEADER(fdt);
Gerald Van Baren35748172007-03-31 12:00:56 -0400131
David Gibsonfc7758e2008-07-09 14:10:24 +1000132 nh = _fdt_grab_space(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
Gerald Van Baren35748172007-03-31 12:00:56 -0400133 if (! nh)
134 return -FDT_ERR_NOSPACE;
135
136 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
137 memcpy(nh->name, name, namelen);
138 return 0;
139}
140
141int fdt_end_node(void *fdt)
142{
Kim Phillipsb2ba62a2013-01-16 13:59:50 +0000143 fdt32_t *en;
Gerald Van Baren35748172007-03-31 12:00:56 -0400144
David Gibsonfc7758e2008-07-09 14:10:24 +1000145 FDT_SW_CHECK_HEADER(fdt);
Gerald Van Baren35748172007-03-31 12:00:56 -0400146
David Gibsonfc7758e2008-07-09 14:10:24 +1000147 en = _fdt_grab_space(fdt, FDT_TAGSIZE);
Gerald Van Baren35748172007-03-31 12:00:56 -0400148 if (! en)
149 return -FDT_ERR_NOSPACE;
150
151 *en = cpu_to_fdt32(FDT_END_NODE);
152 return 0;
153}
154
David Gibsonfc7758e2008-07-09 14:10:24 +1000155static int _fdt_find_add_string(void *fdt, const char *s)
Gerald Van Baren35748172007-03-31 12:00:56 -0400156{
157 char *strtab = (char *)fdt + fdt_totalsize(fdt);
158 const char *p;
159 int strtabsize = fdt_size_dt_strings(fdt);
160 int len = strlen(s) + 1;
161 int struct_top, offset;
162
163 p = _fdt_find_string(strtab - strtabsize, strtabsize, s);
164 if (p)
165 return p - strtab;
166
167 /* Add it */
168 offset = -strtabsize - len;
169 struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
170 if (fdt_totalsize(fdt) + offset < struct_top)
171 return 0; /* no more room :( */
172
173 memcpy(strtab + offset, s, len);
Kumar Gala8d04f022007-10-24 11:04:22 -0500174 fdt_set_size_dt_strings(fdt, strtabsize + len);
Gerald Van Baren35748172007-03-31 12:00:56 -0400175 return offset;
176}
177
Simon Glassf8a2d7a2016-02-22 22:55:39 -0700178int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
Gerald Van Baren35748172007-03-31 12:00:56 -0400179{
180 struct fdt_property *prop;
Gerald Van Baren35748172007-03-31 12:00:56 -0400181 int nameoff;
182
David Gibsonfc7758e2008-07-09 14:10:24 +1000183 FDT_SW_CHECK_HEADER(fdt);
Gerald Van Baren35748172007-03-31 12:00:56 -0400184
David Gibsonfc7758e2008-07-09 14:10:24 +1000185 nameoff = _fdt_find_add_string(fdt, name);
Gerald Van Baren35748172007-03-31 12:00:56 -0400186 if (nameoff == 0)
187 return -FDT_ERR_NOSPACE;
188
David Gibsonfc7758e2008-07-09 14:10:24 +1000189 prop = _fdt_grab_space(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
Gerald Van Baren35748172007-03-31 12:00:56 -0400190 if (! prop)
191 return -FDT_ERR_NOSPACE;
192
193 prop->tag = cpu_to_fdt32(FDT_PROP);
194 prop->nameoff = cpu_to_fdt32(nameoff);
195 prop->len = cpu_to_fdt32(len);
Simon Glassf8a2d7a2016-02-22 22:55:39 -0700196 *valp = prop->data;
197 return 0;
198}
199
200int fdt_property(void *fdt, const char *name, const void *val, int len)
201{
202 void *ptr;
203 int ret;
204
205 ret = fdt_property_placeholder(fdt, name, len, &ptr);
206 if (ret)
207 return ret;
208 memcpy(ptr, val, len);
Gerald Van Baren35748172007-03-31 12:00:56 -0400209 return 0;
210}
211
212int fdt_finish(void *fdt)
213{
Gerald Van Baren35748172007-03-31 12:00:56 -0400214 char *p = (char *)fdt;
Kim Phillipsb2ba62a2013-01-16 13:59:50 +0000215 fdt32_t *end;
Gerald Van Baren35748172007-03-31 12:00:56 -0400216 int oldstroffset, newstroffset;
217 uint32_t tag;
218 int offset, nextoffset;
219
David Gibsonfc7758e2008-07-09 14:10:24 +1000220 FDT_SW_CHECK_HEADER(fdt);
Gerald Van Baren35748172007-03-31 12:00:56 -0400221
222 /* Add terminator */
David Gibsonfc7758e2008-07-09 14:10:24 +1000223 end = _fdt_grab_space(fdt, sizeof(*end));
Gerald Van Baren35748172007-03-31 12:00:56 -0400224 if (! end)
225 return -FDT_ERR_NOSPACE;
226 *end = cpu_to_fdt32(FDT_END);
227
228 /* Relocate the string table */
229 oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
230 newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
231 memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
Kumar Gala8d04f022007-10-24 11:04:22 -0500232 fdt_set_off_dt_strings(fdt, newstroffset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400233
234 /* Walk the structure, correcting string offsets */
235 offset = 0;
Kumar Gala8d04f022007-10-24 11:04:22 -0500236 while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
Gerald Van Baren35748172007-03-31 12:00:56 -0400237 if (tag == FDT_PROP) {
Kumar Gala8d04f022007-10-24 11:04:22 -0500238 struct fdt_property *prop =
David Gibsona22d9cf2009-02-06 14:03:24 +1100239 _fdt_offset_ptr_w(fdt, offset);
Gerald Van Baren35748172007-03-31 12:00:56 -0400240 int nameoff;
241
Gerald Van Baren35748172007-03-31 12:00:56 -0400242 nameoff = fdt32_to_cpu(prop->nameoff);
243 nameoff += fdt_size_dt_strings(fdt);
244 prop->nameoff = cpu_to_fdt32(nameoff);
245 }
246 offset = nextoffset;
247 }
David Gibsona22d9cf2009-02-06 14:03:24 +1100248 if (nextoffset < 0)
249 return nextoffset;
Gerald Van Baren35748172007-03-31 12:00:56 -0400250
251 /* Finally, adjust the header */
Kumar Gala8d04f022007-10-24 11:04:22 -0500252 fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
253 fdt_set_magic(fdt, FDT_MAGIC);
Gerald Van Baren35748172007-03-31 12:00:56 -0400254 return 0;
255}