1 // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
3 * libfdt - Flat Device Tree manipulation
4 * Copyright (C) 2006 David Gibson, IBM Corporation.
6 #include "libfdt_env.h"
11 #include "libfdt_internal.h"
13 static int fdt_blocks_misordered_(const void *fdt,
14 int mem_rsv_size, int struct_size)
18 return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
19 || (fdt_off_dt_struct(fdt) <
20 (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
21 || (fdt_off_dt_strings(fdt) <
22 (fdt_off_dt_struct(fdt) + struct_size))
23 || (fdt_totalsize(fdt) <
24 (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
27 static int fdt_rw_probe_(void *fdt)
33 if (fdt_chk_version() && fdt_version(fdt) < 17)
34 return -FDT_ERR_BADVERSION;
35 if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
36 fdt_size_dt_struct(fdt)))
37 return -FDT_ERR_BADLAYOUT;
38 if (fdt_chk_version() && fdt_version(fdt) > 17)
39 fdt_set_version(fdt, 17);
44 #define FDT_RW_PROBE(fdt) \
47 if (fdt_chk_extra() && (err_ = fdt_rw_probe_(fdt)) != 0) \
51 static inline int fdt_data_size_(void *fdt)
53 return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
56 static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
58 char *p = splicepoint;
59 char *end = (char *)fdt + fdt_data_size_(fdt);
61 if (((p + oldlen) < p) || ((p + oldlen) > end))
62 return -FDT_ERR_BADOFFSET;
63 if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt))
64 return -FDT_ERR_BADOFFSET;
65 if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
66 return -FDT_ERR_NOSPACE;
67 memmove(p + newlen, p + oldlen, end - p - oldlen);
71 static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
74 int delta = (newn - oldn) * sizeof(*p);
76 err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
79 fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
80 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
84 static int fdt_splice_struct_(void *fdt, void *p,
85 int oldlen, int newlen)
87 int delta = newlen - oldlen;
90 if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
93 fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
94 fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
98 /* Must only be used to roll back in case of error */
99 static void fdt_del_last_string_(void *fdt, const char *s)
101 int newlen = strlen(s) + 1;
103 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) - newlen);
106 static int fdt_splice_string_(void *fdt, int newlen)
108 void *p = (char *)fdt
109 + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
112 if ((err = fdt_splice_(fdt, p, 0, newlen)))
115 fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
120 * fdt_find_add_string_() - Find or allocate a string
122 * @fdt: pointer to the device tree to check/adjust
123 * @s: string to find/add
124 * @allocated: Set to 0 if the string was found, 1 if not found and so
125 * allocated. Ignored if !fdt_chk_basic()
126 * @return offset of string in the string table (whether found or added)
128 static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
130 char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
133 int len = strlen(s) + 1;
139 p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
144 new = strtab + fdt_size_dt_strings(fdt);
145 err = fdt_splice_string_(fdt, len);
153 return (new - strtab);
156 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
158 struct fdt_reserve_entry *re;
163 re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
164 err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
168 re->address = cpu_to_fdt64(address);
169 re->size = cpu_to_fdt64(size);
173 int fdt_del_mem_rsv(void *fdt, int n)
175 struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);
179 if (n >= fdt_num_mem_rsv(fdt))
180 return -FDT_ERR_NOTFOUND;
182 return fdt_splice_mem_rsv_(fdt, re, 1, 0);
185 static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
186 int len, struct fdt_property **prop)
191 *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
195 if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
199 (*prop)->len = cpu_to_fdt32(len);
203 static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
204 int len, struct fdt_property **prop)
212 if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
215 namestroff = fdt_find_add_string_(fdt, name, &allocated);
219 *prop = fdt_offset_ptr_w_(fdt, nextoffset);
220 proplen = sizeof(**prop) + FDT_TAGALIGN(len);
222 err = fdt_splice_struct_(fdt, *prop, 0, proplen);
224 /* Delete the string if we failed to add it */
225 if (fdt_chk_basic() && allocated)
226 fdt_del_last_string_(fdt, name);
230 (*prop)->tag = cpu_to_fdt32(FDT_PROP);
231 (*prop)->nameoff = cpu_to_fdt32(namestroff);
232 (*prop)->len = cpu_to_fdt32(len);
236 int fdt_set_name(void *fdt, int nodeoffset, const char *name)
244 namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
248 newlen = strlen(name);
250 err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
251 FDT_TAGALIGN(newlen+1));
255 memcpy(namep, name, newlen+1);
259 int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
260 int len, void **prop_data)
262 struct fdt_property *prop;
267 err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
268 if (err == -FDT_ERR_NOTFOUND)
269 err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
273 *prop_data = prop->data;
277 int fdt_setprop(void *fdt, int nodeoffset, const char *name,
278 const void *val, int len)
283 err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
288 memcpy(prop_data, val, len);
292 int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
293 const void *val, int len)
295 struct fdt_property *prop;
296 int err, oldlen, newlen;
300 prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
302 newlen = len + oldlen;
303 err = fdt_splice_struct_(fdt, prop->data,
304 FDT_TAGALIGN(oldlen),
305 FDT_TAGALIGN(newlen));
308 prop->len = cpu_to_fdt32(newlen);
309 memcpy(prop->data + oldlen, val, len);
311 err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
314 memcpy(prop->data, val, len);
319 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
321 struct fdt_property *prop;
326 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
330 proplen = sizeof(*prop) + FDT_TAGALIGN(len);
331 return fdt_splice_struct_(fdt, prop, proplen, 0);
334 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
335 const char *name, int namelen)
337 struct fdt_node_header *nh;
338 int offset, nextoffset;
346 offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
348 return -FDT_ERR_EXISTS;
349 else if (offset != -FDT_ERR_NOTFOUND)
352 /* Try to place the new node after the parent's properties */
353 fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
356 tag = fdt_next_tag(fdt, offset, &nextoffset);
357 } while ((tag == FDT_PROP) || (tag == FDT_NOP));
359 nh = fdt_offset_ptr_w_(fdt, offset);
360 nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
362 err = fdt_splice_struct_(fdt, nh, 0, nodelen);
366 nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
367 memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
368 memcpy(nh->name, name, namelen);
369 endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
370 *endtag = cpu_to_fdt32(FDT_END_NODE);
375 int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
377 return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
380 int fdt_del_node(void *fdt, int nodeoffset)
386 endoffset = fdt_node_end_offset_(fdt, nodeoffset);
390 return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
391 endoffset - nodeoffset, 0);
394 static void fdt_packblocks_(const char *old, char *new,
395 int mem_rsv_size, int struct_size)
397 int mem_rsv_off, struct_off, strings_off;
399 mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
400 struct_off = mem_rsv_off + mem_rsv_size;
401 strings_off = struct_off + struct_size;
403 memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
404 fdt_set_off_mem_rsvmap(new, mem_rsv_off);
406 memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
407 fdt_set_off_dt_struct(new, struct_off);
408 fdt_set_size_dt_struct(new, struct_size);
410 memmove(new + strings_off, old + fdt_off_dt_strings(old),
411 fdt_size_dt_strings(old));
412 fdt_set_off_dt_strings(new, strings_off);
413 fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
416 int fdt_open_into(const void *fdt, void *buf, int bufsize)
419 int mem_rsv_size, struct_size;
421 const char *fdtstart = fdt;
422 const char *fdtend = fdtstart + fdt_totalsize(fdt);
427 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
428 * sizeof(struct fdt_reserve_entry);
430 if (!fdt_chk_version() || fdt_version(fdt) >= 17) {
431 struct_size = fdt_size_dt_struct(fdt);
434 while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
440 if (!fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
441 /* no further work necessary */
442 err = fdt_move(fdt, buf, bufsize);
445 fdt_set_version(buf, 17);
446 fdt_set_size_dt_struct(buf, struct_size);
447 fdt_set_totalsize(buf, bufsize);
451 /* Need to reorder */
452 newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
453 + struct_size + fdt_size_dt_strings(fdt);
455 if (bufsize < newsize)
456 return -FDT_ERR_NOSPACE;
458 /* First attempt to build converted tree at beginning of buffer */
460 /* But if that overlaps with the old tree... */
461 if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
462 /* Try right after the old tree instead */
463 tmp = (char *)(uintptr_t)fdtend;
464 if ((tmp + newsize) > ((char *)buf + bufsize))
465 return -FDT_ERR_NOSPACE;
468 fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size);
469 memmove(buf, tmp, newsize);
471 fdt_set_magic(buf, FDT_MAGIC);
472 fdt_set_totalsize(buf, bufsize);
473 fdt_set_version(buf, 17);
474 fdt_set_last_comp_version(buf, 16);
475 fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
480 int fdt_pack(void *fdt)
486 mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
487 * sizeof(struct fdt_reserve_entry);
488 fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
489 fdt_set_totalsize(fdt, fdt_data_size_(fdt));