baseport/syborg/svpplatform/libfdt/fdt_rw.c
changeset 2 d55eb581a87c
parent 0 ffa851df0825
equal deleted inserted replaced
1:2fb8b9db1c86 2:d55eb581a87c
       
     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 
       
    58 static int _blocks_misordered(const void *fdt,
       
    59 			      int mem_rsv_size, int struct_size)
       
    60 {
       
    61 	return (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8))
       
    62 		|| (fdt_off_dt_struct(fdt) <
       
    63 		    (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
       
    64 		|| (fdt_off_dt_strings(fdt) <
       
    65 		    (fdt_off_dt_struct(fdt) + struct_size))
       
    66 		|| (fdt_totalsize(fdt) <
       
    67 		    (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
       
    68 }
       
    69 
       
    70 static int rw_check_header(void *fdt)
       
    71 {
       
    72 	int err;
       
    73 
       
    74 	if ((err = fdt_check_header(fdt)))
       
    75 		return err;
       
    76 	if (fdt_version(fdt) < 17)
       
    77 		return -FDT_ERR_BADVERSION;
       
    78 	if (_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
       
    79 			       fdt_size_dt_struct(fdt)))
       
    80 		return -FDT_ERR_BADLAYOUT;
       
    81 	if (fdt_version(fdt) > 17)
       
    82 		fdt_set_version(fdt, 17);
       
    83 
       
    84 	return 0;
       
    85 }
       
    86 
       
    87 #define RW_CHECK_HEADER(fdt) \
       
    88 	{ \
       
    89 		int err; \
       
    90 		if ((err = rw_check_header(fdt)) != 0) \
       
    91 			return err; \
       
    92 	}
       
    93 
       
    94 static inline int _blob_data_size(void *fdt)
       
    95 {
       
    96 	return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
       
    97 }
       
    98 
       
    99 static int _blob_splice(void *fdt, void *p, int oldlen, int newlen)
       
   100 {
       
   101 	void *end = fdt + _blob_data_size(fdt);
       
   102 
       
   103 	if (((p + oldlen) < p) || ((p + oldlen) > end))
       
   104 		return -FDT_ERR_BADOFFSET;
       
   105 	if ((end - oldlen + newlen) > (fdt + fdt_totalsize(fdt)))
       
   106 		return -FDT_ERR_NOSPACE;
       
   107 	memmove(p + newlen, p + oldlen, end - p - oldlen);
       
   108 	return 0;
       
   109 }
       
   110 
       
   111 static int _blob_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
       
   112 				int oldn, int newn)
       
   113 {
       
   114 	int delta = (newn - oldn) * sizeof(*p);
       
   115 	int err;
       
   116 	err = _blob_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
       
   117 	if (err)
       
   118 		return err;
       
   119 	fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
       
   120 	fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
       
   121 	return 0;
       
   122 }
       
   123 
       
   124 static int _blob_splice_struct(void *fdt, void *p,
       
   125 			       int oldlen, int newlen)
       
   126 {
       
   127 	int delta = newlen - oldlen;
       
   128 	int err;
       
   129 
       
   130 	if ((err = _blob_splice(fdt, p, oldlen, newlen)))
       
   131 		return err;
       
   132 
       
   133 	fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
       
   134 	fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
       
   135 	return 0;
       
   136 }
       
   137 
       
   138 static int _blob_splice_string(void *fdt, int newlen)
       
   139 {
       
   140 	void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
       
   141 	int err;
       
   142 
       
   143 	if ((err = _blob_splice(fdt, p, 0, newlen)))
       
   144 		return err;
       
   145 
       
   146 	fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
       
   147 	return 0;
       
   148 }
       
   149 
       
   150 static int _find_add_string(void *fdt, const char *s)
       
   151 {
       
   152 	char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
       
   153 	const char *p;
       
   154 	char *new;
       
   155 	int len = strlen(s) + 1;
       
   156 	int err;
       
   157 
       
   158 	p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
       
   159 	if (p)
       
   160 		/* found it */
       
   161 		return (p - strtab);
       
   162 
       
   163 	new = strtab + fdt_size_dt_strings(fdt);
       
   164 	err = _blob_splice_string(fdt, len);
       
   165 	if (err)
       
   166 		return err;
       
   167 
       
   168 	memcpy(new, s, len);
       
   169 	return (new - strtab);
       
   170 }
       
   171 
       
   172 int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
       
   173 {
       
   174 	struct fdt_reserve_entry *re;
       
   175 	int err;
       
   176 
       
   177 	if ((err = rw_check_header(fdt)))
       
   178 		return err;
       
   179 
       
   180 	re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
       
   181 	err = _blob_splice_mem_rsv(fdt, re, 0, 1);
       
   182 	if (err)
       
   183 		return err;
       
   184 
       
   185 	re->address = cpu_to_fdt64(address);
       
   186 	re->size = cpu_to_fdt64(size);
       
   187 	return 0;
       
   188 }
       
   189 
       
   190 int fdt_del_mem_rsv(void *fdt, int n)
       
   191 {
       
   192 	struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
       
   193 	int err;
       
   194 
       
   195 	if ((err = rw_check_header(fdt)))
       
   196 		return err;
       
   197 	if (n >= fdt_num_mem_rsv(fdt))
       
   198 		return -FDT_ERR_NOTFOUND;
       
   199 
       
   200 	err = _blob_splice_mem_rsv(fdt, re, 1, 0);
       
   201 	if (err)
       
   202 		return err;
       
   203 	return 0;
       
   204 }
       
   205 
       
   206 static int _resize_property(void *fdt, int nodeoffset, const char *name, int len,
       
   207 			    struct fdt_property **prop)
       
   208 {
       
   209 	int oldlen;
       
   210 	int err;
       
   211 
       
   212 	*prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
       
   213 	if (! (*prop))
       
   214 		return oldlen;
       
   215 
       
   216 	if ((err = _blob_splice_struct(fdt, (*prop)->data,
       
   217 				       ALIGN(oldlen, FDT_TAGSIZE),
       
   218 				       ALIGN(len, FDT_TAGSIZE))))
       
   219 		return err;
       
   220 
       
   221 	(*prop)->len = cpu_to_fdt32(len);
       
   222 	return 0;
       
   223 }
       
   224 
       
   225 static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
       
   226 			 struct fdt_property **prop)
       
   227 {
       
   228 	uint32_t tag;
       
   229 	int proplen;
       
   230 	int nextoffset;
       
   231 	int namestroff;
       
   232 	int err;
       
   233 
       
   234 	tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
       
   235 	if (tag != FDT_BEGIN_NODE)
       
   236 		return -FDT_ERR_BADOFFSET;
       
   237 
       
   238 	namestroff = _find_add_string(fdt, name);
       
   239 	if (namestroff < 0)
       
   240 		return namestroff;
       
   241 
       
   242 	*prop = _fdt_offset_ptr_w(fdt, nextoffset);
       
   243 	proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE);
       
   244 
       
   245 	err = _blob_splice_struct(fdt, *prop, 0, proplen);
       
   246 	if (err)
       
   247 		return err;
       
   248 
       
   249 	(*prop)->tag = cpu_to_fdt32(FDT_PROP);
       
   250 	(*prop)->nameoff = cpu_to_fdt32(namestroff);
       
   251 	(*prop)->len = cpu_to_fdt32(len);
       
   252 	return 0;
       
   253 }
       
   254 
       
   255 int fdt_set_name(void *fdt, int nodeoffset, const char *name)
       
   256 {
       
   257 	char *namep;
       
   258 	int oldlen, newlen;
       
   259 	int err;
       
   260 
       
   261 	if ((err = rw_check_header(fdt)))
       
   262 		return err;
       
   263 
       
   264 	namep = (char *)fdt_get_name(fdt, nodeoffset, &oldlen);
       
   265 	if (!namep)
       
   266 		return oldlen;
       
   267 
       
   268 	newlen = strlen(name);
       
   269 
       
   270 	err = _blob_splice_struct(fdt, namep, ALIGN(oldlen+1, FDT_TAGSIZE),
       
   271 				  ALIGN(newlen+1, FDT_TAGSIZE));
       
   272 	if (err)
       
   273 		return err;
       
   274 
       
   275 	memcpy(namep, name, newlen+1);
       
   276 	return 0;
       
   277 }
       
   278 
       
   279 int fdt_setprop(void *fdt, int nodeoffset, const char *name,
       
   280 		const void *val, int len)
       
   281 {
       
   282 	struct fdt_property *prop;
       
   283 	int err;
       
   284 
       
   285 	if ((err = rw_check_header(fdt)))
       
   286 		return err;
       
   287 
       
   288 	err = _resize_property(fdt, nodeoffset, name, len, &prop);
       
   289 	if (err == -FDT_ERR_NOTFOUND)
       
   290 		err = _add_property(fdt, nodeoffset, name, len, &prop);
       
   291 	if (err)
       
   292 		return err;
       
   293 
       
   294 	memcpy(prop->data, val, len);
       
   295 	return 0;
       
   296 }
       
   297 
       
   298 int fdt_delprop(void *fdt, int nodeoffset, const char *name)
       
   299 {
       
   300 	struct fdt_property *prop;
       
   301 	int len, proplen;
       
   302 
       
   303 	RW_CHECK_HEADER(fdt);
       
   304 
       
   305 	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
       
   306 	if (! prop)
       
   307 		return len;
       
   308 
       
   309 	proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE);
       
   310 	return _blob_splice_struct(fdt, prop, proplen, 0);
       
   311 }
       
   312 
       
   313 int fdt_add_subnode_namelen(void *fdt, int parentoffset,
       
   314 			    const char *name, int namelen)
       
   315 {
       
   316 	struct fdt_node_header *nh;
       
   317 	int offset, nextoffset;
       
   318 	int nodelen;
       
   319 	int err;
       
   320 	uint32_t tag;
       
   321 	uint32_t *endtag;
       
   322 
       
   323 	RW_CHECK_HEADER(fdt);
       
   324 
       
   325 	offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
       
   326 	if (offset >= 0)
       
   327 		return -FDT_ERR_EXISTS;
       
   328 	else if (offset != -FDT_ERR_NOTFOUND)
       
   329 		return offset;
       
   330 
       
   331 	/* Try to place the new node after the parent's properties */
       
   332 	fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
       
   333 	do {
       
   334 		offset = nextoffset;
       
   335 		tag = fdt_next_tag(fdt, offset, &nextoffset);
       
   336 	} while (tag == FDT_PROP);
       
   337 
       
   338 	nh = _fdt_offset_ptr_w(fdt, offset);
       
   339 	nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE;
       
   340 
       
   341 	err = _blob_splice_struct(fdt, nh, 0, nodelen);
       
   342 	if (err)
       
   343 		return err;
       
   344 
       
   345 	nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
       
   346 	memset(nh->name, 0, ALIGN(namelen+1, FDT_TAGSIZE));
       
   347 	memcpy(nh->name, name, namelen);
       
   348 	endtag = (uint32_t *)((void *)nh + nodelen - FDT_TAGSIZE);
       
   349 	*endtag = cpu_to_fdt32(FDT_END_NODE);
       
   350 
       
   351 	return offset;
       
   352 }
       
   353 
       
   354 int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
       
   355 {
       
   356 	return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
       
   357 }
       
   358 
       
   359 int fdt_del_node(void *fdt, int nodeoffset)
       
   360 {
       
   361 	int endoffset;
       
   362 
       
   363 	RW_CHECK_HEADER(fdt);
       
   364 
       
   365 	endoffset = _fdt_node_end_offset(fdt, nodeoffset);
       
   366 	if (endoffset < 0)
       
   367 		return endoffset;
       
   368 
       
   369 	return _blob_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
       
   370 				   endoffset - nodeoffset, 0);
       
   371 }
       
   372 
       
   373 static void _packblocks(const void *fdt, void *buf,
       
   374 		       int mem_rsv_size, int struct_size)
       
   375 {
       
   376 	int mem_rsv_off, struct_off, strings_off;
       
   377 
       
   378 	mem_rsv_off = ALIGN(sizeof(struct fdt_header), 8);
       
   379 	struct_off = mem_rsv_off + mem_rsv_size;
       
   380 	strings_off = struct_off + struct_size;
       
   381 
       
   382 	memmove(buf + mem_rsv_off, fdt + fdt_off_mem_rsvmap(fdt), mem_rsv_size);
       
   383 	fdt_set_off_mem_rsvmap(buf, mem_rsv_off);
       
   384 
       
   385 	memmove(buf + struct_off, fdt + fdt_off_dt_struct(fdt), struct_size);
       
   386 	fdt_set_off_dt_struct(buf, struct_off);
       
   387 	fdt_set_size_dt_struct(buf, struct_size);
       
   388 
       
   389 	memmove(buf + strings_off, fdt + fdt_off_dt_strings(fdt),
       
   390 		fdt_size_dt_strings(fdt));
       
   391 	fdt_set_off_dt_strings(buf, strings_off);
       
   392 	fdt_set_size_dt_strings(buf, fdt_size_dt_strings(fdt));
       
   393 }
       
   394 
       
   395 int fdt_open_into(const void *fdt, void *buf, int bufsize)
       
   396 {
       
   397 	int err;
       
   398 	int mem_rsv_size, struct_size;
       
   399 	int newsize;
       
   400 	void *tmp;
       
   401 
       
   402 	err = fdt_check_header(fdt);
       
   403 	if (err)
       
   404 		return err;
       
   405 
       
   406 	mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
       
   407 		* sizeof(struct fdt_reserve_entry);
       
   408 
       
   409 	if (fdt_version(fdt) >= 17) {
       
   410 		struct_size = fdt_size_dt_struct(fdt);
       
   411 	} else {
       
   412 		struct_size = 0;
       
   413 		while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
       
   414 			;
       
   415 	}
       
   416 
       
   417 	if (!_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
       
   418 		/* no further work necessary */
       
   419 		err = fdt_move(fdt, buf, bufsize);
       
   420 		if (err)
       
   421 			return err;
       
   422 		fdt_set_version(buf, 17);
       
   423 		fdt_set_size_dt_struct(buf, struct_size);
       
   424 		fdt_set_totalsize(buf, bufsize);
       
   425 		return 0;
       
   426 	}
       
   427 
       
   428 	/* Need to reorder */
       
   429 	newsize = ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
       
   430 		+ struct_size + fdt_size_dt_strings(fdt);
       
   431 
       
   432 	if (bufsize < newsize)
       
   433 		return -FDT_ERR_NOSPACE;
       
   434 
       
   435 	if (((buf + newsize) <= fdt)
       
   436 	    || (buf >= (fdt + fdt_totalsize(fdt)))) {
       
   437 		tmp = buf;
       
   438 	} else {
       
   439 		tmp = (void *)fdt + fdt_totalsize(fdt);
       
   440 		if ((tmp + newsize) > (buf + bufsize))
       
   441 			return -FDT_ERR_NOSPACE;
       
   442 	}
       
   443 
       
   444 	_packblocks(fdt, tmp, mem_rsv_size, struct_size);
       
   445 	memmove(buf, tmp, newsize);
       
   446 
       
   447 	fdt_set_magic(buf, FDT_MAGIC);
       
   448 	fdt_set_totalsize(buf, bufsize);
       
   449 	fdt_set_version(buf, 17);
       
   450 	fdt_set_last_comp_version(buf, 16);
       
   451 	fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
       
   452 
       
   453 	return 0;
       
   454 }
       
   455 
       
   456 int fdt_pack(void *fdt)
       
   457 {
       
   458 	int mem_rsv_size;
       
   459 	int err;
       
   460 
       
   461 	err = rw_check_header(fdt);
       
   462 	if (err)
       
   463 		return err;
       
   464 
       
   465 	mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
       
   466 		* sizeof(struct fdt_reserve_entry);
       
   467 	_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
       
   468 	fdt_set_totalsize(fdt, _blob_data_size(fdt));
       
   469 
       
   470 	return 0;
       
   471 }