Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 1 | /* |
| 2 | * libfdt - Flat Device Tree manipulation |
| 3 | * Copyright (C) 2006 David Gibson, IBM Corporation. |
| 4 | * |
Kumar Gala | c8ab705 | 2007-10-24 11:04:22 -0500 | [diff] [blame] | 5 | * libfdt is dual licensed: you can use it either under the terms of |
| 6 | * the GPL, or the BSD license, at your option. |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 7 | * |
Kumar Gala | c8ab705 | 2007-10-24 11:04:22 -0500 | [diff] [blame] | 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. |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 12 | * |
Kumar Gala | c8ab705 | 2007-10-24 11:04:22 -0500 | [diff] [blame] | 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. |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 50 | */ |
| 51 | #include "libfdt_env.h" |
| 52 | |
Bartlomiej Sieka | 6125086 | 2008-02-29 16:00:24 +0100 | [diff] [blame] | 53 | #ifndef USE_HOSTCC |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 54 | #include <fdt.h> |
| 55 | #include <libfdt.h> |
Bartlomiej Sieka | 6125086 | 2008-02-29 16:00:24 +0100 | [diff] [blame] | 56 | #else |
| 57 | #include "fdt_host.h" |
| 58 | #endif |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 59 | |
| 60 | #include "libfdt_internal.h" |
| 61 | |
Gerald Van Baren | 9f0f358 | 2007-04-06 14:17:14 -0400 | [diff] [blame] | 62 | int fdt_check_header(const void *fdt) |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 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; |
David Gibson | 9457d9d | 2008-07-09 14:10:24 +1000 | [diff] [blame] | 70 | } else if (fdt_magic(fdt) == FDT_SW_MAGIC) { |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 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 | |
Jon Loeliger | d94d0f1 | 2008-09-25 11:02:17 -0500 | [diff] [blame] | 81 | const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len) |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 82 | { |
David Gibson | b4141b8 | 2008-07-07 10:10:48 +1000 | [diff] [blame] | 83 | const char *p; |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 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 | |
Kumar Gala | c8ab705 | 2007-10-24 11:04:22 -0500 | [diff] [blame] | 97 | uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset) |
| 98 | { |
| 99 | const uint32_t *tagp, *lenp; |
| 100 | uint32_t tag; |
| 101 | const char *p; |
| 102 | |
| 103 | if (offset % FDT_TAGSIZE) |
| 104 | return -1; |
| 105 | |
| 106 | tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE); |
| 107 | if (! tagp) |
| 108 | return FDT_END; /* premature end */ |
| 109 | tag = fdt32_to_cpu(*tagp); |
| 110 | offset += FDT_TAGSIZE; |
| 111 | |
| 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; |
| 120 | break; |
| 121 | case FDT_PROP: |
| 122 | lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp)); |
| 123 | if (! lenp) |
| 124 | return FDT_END; |
| 125 | /* skip name offset, length and value */ |
| 126 | offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp); |
| 127 | break; |
| 128 | } |
| 129 | |
| 130 | if (nextoffset) |
David Gibson | 9457d9d | 2008-07-09 14:10:24 +1000 | [diff] [blame] | 131 | *nextoffset = FDT_TAGALIGN(offset); |
Kumar Gala | c8ab705 | 2007-10-24 11:04:22 -0500 | [diff] [blame] | 132 | |
| 133 | return tag; |
| 134 | } |
| 135 | |
David Gibson | 148a49b | 2008-05-20 17:19:11 +1000 | [diff] [blame] | 136 | int _fdt_check_node_offset(const void *fdt, int offset) |
| 137 | { |
| 138 | if ((offset < 0) || (offset % FDT_TAGSIZE) |
| 139 | || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE)) |
| 140 | return -FDT_ERR_BADOFFSET; |
| 141 | |
| 142 | return offset; |
| 143 | } |
| 144 | |
David Gibson | d9d793c | 2008-02-12 11:58:31 +1100 | [diff] [blame] | 145 | int fdt_next_node(const void *fdt, int offset, int *depth) |
| 146 | { |
| 147 | int nextoffset = 0; |
| 148 | uint32_t tag; |
| 149 | |
David Gibson | 148a49b | 2008-05-20 17:19:11 +1000 | [diff] [blame] | 150 | if (offset >= 0) |
| 151 | if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0) |
| 152 | return nextoffset; |
David Gibson | d9d793c | 2008-02-12 11:58:31 +1100 | [diff] [blame] | 153 | |
| 154 | do { |
| 155 | offset = nextoffset; |
| 156 | tag = fdt_next_tag(fdt, offset, &nextoffset); |
| 157 | |
| 158 | switch (tag) { |
| 159 | case FDT_PROP: |
| 160 | case FDT_NOP: |
| 161 | break; |
| 162 | |
| 163 | case FDT_BEGIN_NODE: |
| 164 | if (depth) |
| 165 | (*depth)++; |
| 166 | break; |
| 167 | |
| 168 | case FDT_END_NODE: |
David Gibson | 954914a | 2009-02-06 14:01:56 +1100 | [diff] [blame^] | 169 | if (depth && ((--(*depth)) < 0)) |
| 170 | return nextoffset; |
David Gibson | d9d793c | 2008-02-12 11:58:31 +1100 | [diff] [blame] | 171 | break; |
| 172 | |
| 173 | case FDT_END: |
| 174 | return -FDT_ERR_NOTFOUND; |
| 175 | |
| 176 | default: |
| 177 | return -FDT_ERR_BADSTRUCTURE; |
| 178 | } |
| 179 | } while (tag != FDT_BEGIN_NODE); |
| 180 | |
| 181 | return offset; |
| 182 | } |
| 183 | |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 184 | const char *_fdt_find_string(const char *strtab, int tabsize, const char *s) |
| 185 | { |
| 186 | int len = strlen(s) + 1; |
| 187 | const char *last = strtab + tabsize - len; |
| 188 | const char *p; |
| 189 | |
| 190 | for (p = strtab; p <= last; p++) |
David Gibson | 9457d9d | 2008-07-09 14:10:24 +1000 | [diff] [blame] | 191 | if (memcmp(p, s, len) == 0) |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 192 | return p; |
| 193 | return NULL; |
| 194 | } |
| 195 | |
| 196 | int fdt_move(const void *fdt, void *buf, int bufsize) |
| 197 | { |
David Gibson | 9457d9d | 2008-07-09 14:10:24 +1000 | [diff] [blame] | 198 | FDT_CHECK_HEADER(fdt); |
Gerald Van Baren | c0577a6 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 199 | |
| 200 | if (fdt_totalsize(fdt) > bufsize) |
| 201 | return -FDT_ERR_NOSPACE; |
| 202 | |
| 203 | memmove(buf, fdt, fdt_totalsize(fdt)); |
| 204 | return 0; |
| 205 | } |