Annotation of elwix/tools/uboot_mkimage/lib/libfdt/fdt.c, revision 1.1
1.1 ! misho 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: #ifndef USE_HOSTCC
! 54: #include <fdt.h>
! 55: #include <libfdt.h>
! 56: #else
! 57: #include "fdt_host.h"
! 58: #endif
! 59:
! 60: #include "libfdt_internal.h"
! 61:
! 62: int fdt_check_header(const void *fdt)
! 63: {
! 64: if (fdt_magic(fdt) == FDT_MAGIC) {
! 65: /* Complete tree */
! 66: if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
! 67: return -FDT_ERR_BADVERSION;
! 68: if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
! 69: return -FDT_ERR_BADVERSION;
! 70: } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
! 71: /* Unfinished sequential-write blob */
! 72: if (fdt_size_dt_struct(fdt) == 0)
! 73: return -FDT_ERR_BADSTATE;
! 74: } else {
! 75: return -FDT_ERR_BADMAGIC;
! 76: }
! 77:
! 78: return 0;
! 79: }
! 80:
! 81: const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
! 82: {
! 83: const char *p;
! 84:
! 85: if (fdt_version(fdt) >= 0x11)
! 86: if (((offset + len) < offset)
! 87: || ((offset + len) > fdt_size_dt_struct(fdt)))
! 88: return NULL;
! 89:
! 90: p = _fdt_offset_ptr(fdt, offset);
! 91:
! 92: if (p + len < p)
! 93: return NULL;
! 94: return p;
! 95: }
! 96:
! 97: uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
! 98: {
! 99: const uint32_t *tagp, *lenp;
! 100: uint32_t tag;
! 101: int offset = startoffset;
! 102: const char *p;
! 103:
! 104: *nextoffset = -FDT_ERR_TRUNCATED;
! 105: tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
! 106: if (!tagp)
! 107: return FDT_END; /* premature end */
! 108: tag = fdt32_to_cpu(*tagp);
! 109: offset += FDT_TAGSIZE;
! 110:
! 111: *nextoffset = -FDT_ERR_BADSTRUCTURE;
! 112: switch (tag) {
! 113: case FDT_BEGIN_NODE:
! 114: /* skip name */
! 115: do {
! 116: p = fdt_offset_ptr(fdt, offset++, 1);
! 117: } while (p && (*p != '\0'));
! 118: if (!p)
! 119: return FDT_END; /* premature end */
! 120: break;
! 121:
! 122: case FDT_PROP:
! 123: lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
! 124: if (!lenp)
! 125: return FDT_END; /* premature end */
! 126: /* skip-name offset, length and value */
! 127: offset += sizeof(struct fdt_property) - FDT_TAGSIZE
! 128: + fdt32_to_cpu(*lenp);
! 129: break;
! 130:
! 131: case FDT_END:
! 132: case FDT_END_NODE:
! 133: case FDT_NOP:
! 134: break;
! 135:
! 136: default:
! 137: return FDT_END;
! 138: }
! 139:
! 140: if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
! 141: return FDT_END; /* premature end */
! 142:
! 143: *nextoffset = FDT_TAGALIGN(offset);
! 144: return tag;
! 145: }
! 146:
! 147: int _fdt_check_node_offset(const void *fdt, int offset)
! 148: {
! 149: if ((offset < 0) || (offset % FDT_TAGSIZE)
! 150: || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
! 151: return -FDT_ERR_BADOFFSET;
! 152:
! 153: return offset;
! 154: }
! 155:
! 156: int fdt_next_node(const void *fdt, int offset, int *depth)
! 157: {
! 158: int nextoffset = 0;
! 159: uint32_t tag;
! 160:
! 161: if (offset >= 0)
! 162: if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
! 163: return nextoffset;
! 164:
! 165: do {
! 166: offset = nextoffset;
! 167: tag = fdt_next_tag(fdt, offset, &nextoffset);
! 168:
! 169: switch (tag) {
! 170: case FDT_PROP:
! 171: case FDT_NOP:
! 172: break;
! 173:
! 174: case FDT_BEGIN_NODE:
! 175: if (depth)
! 176: (*depth)++;
! 177: break;
! 178:
! 179: case FDT_END_NODE:
! 180: if (depth && ((--(*depth)) < 0))
! 181: return nextoffset;
! 182: break;
! 183:
! 184: case FDT_END:
! 185: if ((nextoffset >= 0)
! 186: || ((nextoffset == -FDT_ERR_TRUNCATED) && !depth))
! 187: return -FDT_ERR_NOTFOUND;
! 188: else
! 189: return nextoffset;
! 190: }
! 191: } while (tag != FDT_BEGIN_NODE);
! 192:
! 193: return offset;
! 194: }
! 195:
! 196: const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
! 197: {
! 198: int len = strlen(s) + 1;
! 199: const char *last = strtab + tabsize - len;
! 200: const char *p;
! 201:
! 202: for (p = strtab; p <= last; p++)
! 203: if (memcmp(p, s, len) == 0)
! 204: return p;
! 205: return NULL;
! 206: }
! 207:
! 208: int fdt_move(const void *fdt, void *buf, int bufsize)
! 209: {
! 210: FDT_CHECK_HEADER(fdt);
! 211:
! 212: if (fdt_totalsize(fdt) > bufsize)
! 213: return -FDT_ERR_NOSPACE;
! 214:
! 215: memmove(buf, fdt, fdt_totalsize(fdt));
! 216: return 0;
! 217: }
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