Gerald Van Baren | 7cd5da0 | 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 | 8d04f02 | 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 | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 7 | * |
Kumar Gala | 8d04f02 | 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 | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 12 | * |
Kumar Gala | 8d04f02 | 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 | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 50 | */ |
| 51 | #include "libfdt_env.h" |
| 52 | |
| 53 | #include <fdt.h> |
| 54 | #include <libfdt.h> |
| 55 | |
| 56 | #include "libfdt_internal.h" |
| 57 | |
Gerald Van Baren | 6679f92 | 2007-04-06 14:17:14 -0400 | [diff] [blame] | 58 | int fdt_check_header(const void *fdt) |
Gerald Van Baren | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 59 | { |
| 60 | if (fdt_magic(fdt) == FDT_MAGIC) { |
| 61 | /* Complete tree */ |
| 62 | if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION) |
| 63 | return -FDT_ERR_BADVERSION; |
| 64 | if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION) |
| 65 | return -FDT_ERR_BADVERSION; |
| 66 | } else if (fdt_magic(fdt) == SW_MAGIC) { |
| 67 | /* Unfinished sequential-write blob */ |
| 68 | if (fdt_size_dt_struct(fdt) == 0) |
| 69 | return -FDT_ERR_BADSTATE; |
| 70 | } else { |
| 71 | return -FDT_ERR_BADMAGIC; |
| 72 | } |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
Kumar Gala | 8d04f02 | 2007-10-24 11:04:22 -0500 | [diff] [blame^] | 77 | const void *fdt_offset_ptr(const void *fdt, int offset, int len) |
Gerald Van Baren | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 78 | { |
Kumar Gala | 8d04f02 | 2007-10-24 11:04:22 -0500 | [diff] [blame^] | 79 | const void *p; |
Gerald Van Baren | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 80 | |
| 81 | if (fdt_version(fdt) >= 0x11) |
| 82 | if (((offset + len) < offset) |
| 83 | || ((offset + len) > fdt_size_dt_struct(fdt))) |
| 84 | return NULL; |
| 85 | |
| 86 | p = _fdt_offset_ptr(fdt, offset); |
| 87 | |
| 88 | if (p + len < p) |
| 89 | return NULL; |
| 90 | return p; |
| 91 | } |
| 92 | |
Kumar Gala | 8d04f02 | 2007-10-24 11:04:22 -0500 | [diff] [blame^] | 93 | uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset) |
| 94 | { |
| 95 | const uint32_t *tagp, *lenp; |
| 96 | uint32_t tag; |
| 97 | const char *p; |
| 98 | |
| 99 | if (offset % FDT_TAGSIZE) |
| 100 | return -1; |
| 101 | |
| 102 | tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE); |
| 103 | if (! tagp) |
| 104 | return FDT_END; /* premature end */ |
| 105 | tag = fdt32_to_cpu(*tagp); |
| 106 | offset += FDT_TAGSIZE; |
| 107 | |
| 108 | switch (tag) { |
| 109 | case FDT_BEGIN_NODE: |
| 110 | /* skip name */ |
| 111 | do { |
| 112 | p = fdt_offset_ptr(fdt, offset++, 1); |
| 113 | } while (p && (*p != '\0')); |
| 114 | if (! p) |
| 115 | return FDT_END; |
| 116 | break; |
| 117 | case FDT_PROP: |
| 118 | lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp)); |
| 119 | if (! lenp) |
| 120 | return FDT_END; |
| 121 | /* skip name offset, length and value */ |
| 122 | offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp); |
| 123 | break; |
| 124 | } |
| 125 | |
| 126 | if (nextoffset) |
| 127 | *nextoffset = ALIGN(offset, FDT_TAGSIZE); |
| 128 | |
| 129 | return tag; |
| 130 | } |
| 131 | |
Gerald Van Baren | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 132 | const char *_fdt_find_string(const char *strtab, int tabsize, const char *s) |
| 133 | { |
| 134 | int len = strlen(s) + 1; |
| 135 | const char *last = strtab + tabsize - len; |
| 136 | const char *p; |
| 137 | |
| 138 | for (p = strtab; p <= last; p++) |
| 139 | if (memeq(p, s, len)) |
| 140 | return p; |
| 141 | return NULL; |
| 142 | } |
| 143 | |
| 144 | int fdt_move(const void *fdt, void *buf, int bufsize) |
| 145 | { |
Gerald Van Baren | 6679f92 | 2007-04-06 14:17:14 -0400 | [diff] [blame] | 146 | int err = fdt_check_header(fdt); |
Gerald Van Baren | 7cd5da0 | 2007-03-31 11:59:59 -0400 | [diff] [blame] | 147 | |
| 148 | if (err) |
| 149 | return err; |
| 150 | |
| 151 | if (fdt_totalsize(fdt) > bufsize) |
| 152 | return -FDT_ERR_NOSPACE; |
| 153 | |
| 154 | memmove(buf, fdt, fdt_totalsize(fdt)); |
| 155 | return 0; |
| 156 | } |