[175263e] | 1 | /* |
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| 2 | * libfdt - Flat Device Tree manipulation |
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| 3 | * Copyright (C) 2006 David Gibson, IBM Corporation. |
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| 4 | * |
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| 5 | * libfdt is dual licensed: you can use it either under the terms of |
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| 6 | * the GPL, or the BSD license, at your option. |
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| 7 | * |
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| 8 | * a) This library is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU General Public License as |
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| 10 | * published by the Free Software Foundation; either version 2 of the |
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| 11 | * License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * This library is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | * GNU General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public |
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| 19 | * License along with this library; if not, write to the Free |
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| 20 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
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| 21 | * MA 02110-1301 USA |
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| 22 | * |
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| 23 | * Alternatively, |
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| 24 | * |
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| 25 | * b) Redistribution and use in source and binary forms, with or |
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| 26 | * without modification, are permitted provided that the following |
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| 27 | * conditions are met: |
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| 28 | * |
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| 29 | * 1. Redistributions of source code must retain the above |
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| 30 | * copyright notice, this list of conditions and the following |
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| 31 | * disclaimer. |
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| 32 | * 2. Redistributions in binary form must reproduce the above |
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| 33 | * copyright notice, this list of conditions and the following |
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| 34 | * disclaimer in the documentation and/or other materials |
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| 35 | * provided with the distribution. |
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| 36 | * |
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| 37 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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| 38 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 39 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 40 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 41 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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| 42 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 47 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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| 48 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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| 49 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 50 | */ |
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| 51 | #include "libfdt_env.h" |
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| 52 | |
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| 53 | #include <fdt.h> |
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| 54 | #include <libfdt.h> |
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| 55 | |
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| 56 | #include "libfdt_internal.h" |
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| 57 | |
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[85d1769] | 58 | static int fdt_sw_probe_(void *fdt) |
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[175263e] | 59 | { |
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[c4267b1] | 60 | if (fdt_magic(fdt) == FDT_MAGIC) |
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| 61 | return -FDT_ERR_BADSTATE; |
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| 62 | else if (fdt_magic(fdt) != FDT_SW_MAGIC) |
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[175263e] | 63 | return -FDT_ERR_BADMAGIC; |
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| 64 | return 0; |
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| 65 | } |
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| 66 | |
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[85d1769] | 67 | #define FDT_SW_PROBE(fdt) \ |
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[175263e] | 68 | { \ |
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| 69 | int err; \ |
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[85d1769] | 70 | if ((err = fdt_sw_probe_(fdt)) != 0) \ |
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[175263e] | 71 | return err; \ |
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| 72 | } |
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| 73 | |
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[c4267b1] | 74 | /* 'memrsv' state: Initial state after fdt_create() |
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| 75 | * |
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| 76 | * Allowed functions: |
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| 77 | * fdt_add_reservmap_entry() |
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| 78 | * fdt_finish_reservemap() [moves to 'struct' state] |
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| 79 | */ |
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| 80 | static int fdt_sw_probe_memrsv_(void *fdt) |
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| 81 | { |
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| 82 | int err = fdt_sw_probe_(fdt); |
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| 83 | if (err) |
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| 84 | return err; |
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| 85 | |
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| 86 | if (fdt_off_dt_strings(fdt) != 0) |
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| 87 | return -FDT_ERR_BADSTATE; |
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| 88 | return 0; |
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| 89 | } |
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| 90 | |
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| 91 | #define FDT_SW_PROBE_MEMRSV(fdt) \ |
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| 92 | { \ |
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| 93 | int err; \ |
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| 94 | if ((err = fdt_sw_probe_memrsv_(fdt)) != 0) \ |
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| 95 | return err; \ |
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| 96 | } |
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| 97 | |
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| 98 | /* 'struct' state: Enter this state after fdt_finish_reservemap() |
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| 99 | * |
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| 100 | * Allowed functions: |
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| 101 | * fdt_begin_node() |
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| 102 | * fdt_end_node() |
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| 103 | * fdt_property*() |
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| 104 | * fdt_finish() [moves to 'complete' state] |
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| 105 | */ |
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| 106 | static int fdt_sw_probe_struct_(void *fdt) |
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| 107 | { |
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| 108 | int err = fdt_sw_probe_(fdt); |
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| 109 | if (err) |
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| 110 | return err; |
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| 111 | |
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| 112 | if (fdt_off_dt_strings(fdt) != fdt_totalsize(fdt)) |
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| 113 | return -FDT_ERR_BADSTATE; |
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| 114 | return 0; |
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| 115 | } |
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| 116 | |
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| 117 | #define FDT_SW_PROBE_STRUCT(fdt) \ |
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| 118 | { \ |
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| 119 | int err; \ |
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| 120 | if ((err = fdt_sw_probe_struct_(fdt)) != 0) \ |
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| 121 | return err; \ |
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| 122 | } |
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| 123 | |
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| 124 | /* 'complete' state: Enter this state after fdt_finish() |
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| 125 | * |
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| 126 | * Allowed functions: none |
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| 127 | */ |
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| 128 | |
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[42f1b37] | 129 | static void *fdt_grab_space_(void *fdt, size_t len) |
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[175263e] | 130 | { |
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| 131 | int offset = fdt_size_dt_struct(fdt); |
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| 132 | int spaceleft; |
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| 133 | |
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| 134 | spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt) |
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| 135 | - fdt_size_dt_strings(fdt); |
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| 136 | |
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| 137 | if ((offset + len < offset) || (offset + len > spaceleft)) |
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| 138 | return NULL; |
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| 139 | |
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| 140 | fdt_set_size_dt_struct(fdt, offset + len); |
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[42f1b37] | 141 | return fdt_offset_ptr_w_(fdt, offset); |
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[175263e] | 142 | } |
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| 143 | |
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| 144 | int fdt_create(void *buf, int bufsize) |
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| 145 | { |
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[80eaf45] | 146 | const size_t hdrsize = FDT_ALIGN(sizeof(struct fdt_header), |
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| 147 | sizeof(struct fdt_reserve_entry)); |
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[175263e] | 148 | void *fdt = buf; |
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| 149 | |
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[80eaf45] | 150 | if (bufsize < hdrsize) |
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[175263e] | 151 | return -FDT_ERR_NOSPACE; |
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| 152 | |
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| 153 | memset(buf, 0, bufsize); |
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| 154 | |
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| 155 | fdt_set_magic(fdt, FDT_SW_MAGIC); |
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| 156 | fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION); |
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| 157 | fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION); |
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| 158 | fdt_set_totalsize(fdt, bufsize); |
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| 159 | |
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[80eaf45] | 160 | fdt_set_off_mem_rsvmap(fdt, hdrsize); |
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[175263e] | 161 | fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt)); |
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[c4267b1] | 162 | fdt_set_off_dt_strings(fdt, 0); |
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[175263e] | 163 | |
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| 164 | return 0; |
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| 165 | } |
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| 166 | |
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| 167 | int fdt_resize(void *fdt, void *buf, int bufsize) |
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| 168 | { |
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| 169 | size_t headsize, tailsize; |
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| 170 | char *oldtail, *newtail; |
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| 171 | |
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[85d1769] | 172 | FDT_SW_PROBE(fdt); |
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[175263e] | 173 | |
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[4fd05d3] | 174 | headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt); |
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[175263e] | 175 | tailsize = fdt_size_dt_strings(fdt); |
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| 176 | |
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[80eaf45] | 177 | if ((headsize + tailsize) > fdt_totalsize(fdt)) |
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| 178 | return -FDT_ERR_INTERNAL; |
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| 179 | |
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[175263e] | 180 | if ((headsize + tailsize) > bufsize) |
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| 181 | return -FDT_ERR_NOSPACE; |
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| 182 | |
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| 183 | oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize; |
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| 184 | newtail = (char *)buf + bufsize - tailsize; |
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| 185 | |
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| 186 | /* Two cases to avoid clobbering data if the old and new |
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| 187 | * buffers partially overlap */ |
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| 188 | if (buf <= fdt) { |
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| 189 | memmove(buf, fdt, headsize); |
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| 190 | memmove(newtail, oldtail, tailsize); |
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| 191 | } else { |
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| 192 | memmove(newtail, oldtail, tailsize); |
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| 193 | memmove(buf, fdt, headsize); |
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| 194 | } |
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| 195 | |
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| 196 | fdt_set_totalsize(buf, bufsize); |
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[c4267b1] | 197 | if (fdt_off_dt_strings(buf)) |
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| 198 | fdt_set_off_dt_strings(buf, bufsize); |
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[175263e] | 199 | |
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| 200 | return 0; |
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| 201 | } |
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| 202 | |
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| 203 | int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size) |
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| 204 | { |
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| 205 | struct fdt_reserve_entry *re; |
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| 206 | int offset; |
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| 207 | |
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[c4267b1] | 208 | FDT_SW_PROBE_MEMRSV(fdt); |
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[175263e] | 209 | |
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| 210 | offset = fdt_off_dt_struct(fdt); |
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| 211 | if ((offset + sizeof(*re)) > fdt_totalsize(fdt)) |
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| 212 | return -FDT_ERR_NOSPACE; |
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| 213 | |
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| 214 | re = (struct fdt_reserve_entry *)((char *)fdt + offset); |
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| 215 | re->address = cpu_to_fdt64(addr); |
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| 216 | re->size = cpu_to_fdt64(size); |
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| 217 | |
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| 218 | fdt_set_off_dt_struct(fdt, offset + sizeof(*re)); |
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| 219 | |
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| 220 | return 0; |
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| 221 | } |
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| 222 | |
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| 223 | int fdt_finish_reservemap(void *fdt) |
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| 224 | { |
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[c4267b1] | 225 | int err = fdt_add_reservemap_entry(fdt, 0, 0); |
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| 226 | |
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| 227 | if (err) |
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| 228 | return err; |
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| 229 | |
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| 230 | fdt_set_off_dt_strings(fdt, fdt_totalsize(fdt)); |
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| 231 | return 0; |
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[175263e] | 232 | } |
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| 233 | |
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| 234 | int fdt_begin_node(void *fdt, const char *name) |
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| 235 | { |
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| 236 | struct fdt_node_header *nh; |
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[c4267b1] | 237 | int namelen; |
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[175263e] | 238 | |
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[c4267b1] | 239 | FDT_SW_PROBE_STRUCT(fdt); |
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[175263e] | 240 | |
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[c4267b1] | 241 | namelen = strlen(name) + 1; |
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[42f1b37] | 242 | nh = fdt_grab_space_(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen)); |
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[175263e] | 243 | if (! nh) |
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| 244 | return -FDT_ERR_NOSPACE; |
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| 245 | |
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| 246 | nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); |
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| 247 | memcpy(nh->name, name, namelen); |
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| 248 | return 0; |
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| 249 | } |
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| 250 | |
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| 251 | int fdt_end_node(void *fdt) |
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| 252 | { |
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| 253 | fdt32_t *en; |
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| 254 | |
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[c4267b1] | 255 | FDT_SW_PROBE_STRUCT(fdt); |
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[175263e] | 256 | |
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[42f1b37] | 257 | en = fdt_grab_space_(fdt, FDT_TAGSIZE); |
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[175263e] | 258 | if (! en) |
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| 259 | return -FDT_ERR_NOSPACE; |
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| 260 | |
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| 261 | *en = cpu_to_fdt32(FDT_END_NODE); |
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| 262 | return 0; |
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| 263 | } |
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| 264 | |
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[42f1b37] | 265 | static int fdt_find_add_string_(void *fdt, const char *s) |
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[175263e] | 266 | { |
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| 267 | char *strtab = (char *)fdt + fdt_totalsize(fdt); |
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| 268 | const char *p; |
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| 269 | int strtabsize = fdt_size_dt_strings(fdt); |
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| 270 | int len = strlen(s) + 1; |
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| 271 | int struct_top, offset; |
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| 272 | |
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[42f1b37] | 273 | p = fdt_find_string_(strtab - strtabsize, strtabsize, s); |
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[175263e] | 274 | if (p) |
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| 275 | return p - strtab; |
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| 276 | |
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| 277 | /* Add it */ |
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| 278 | offset = -strtabsize - len; |
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| 279 | struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt); |
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| 280 | if (fdt_totalsize(fdt) + offset < struct_top) |
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| 281 | return 0; /* no more room :( */ |
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| 282 | |
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| 283 | memcpy(strtab + offset, s, len); |
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| 284 | fdt_set_size_dt_strings(fdt, strtabsize + len); |
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| 285 | return offset; |
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| 286 | } |
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| 287 | |
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[f984d8f] | 288 | int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp) |
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[175263e] | 289 | { |
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| 290 | struct fdt_property *prop; |
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| 291 | int nameoff; |
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| 292 | |
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[c4267b1] | 293 | FDT_SW_PROBE_STRUCT(fdt); |
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[175263e] | 294 | |
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[42f1b37] | 295 | nameoff = fdt_find_add_string_(fdt, name); |
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[175263e] | 296 | if (nameoff == 0) |
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| 297 | return -FDT_ERR_NOSPACE; |
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| 298 | |
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[42f1b37] | 299 | prop = fdt_grab_space_(fdt, sizeof(*prop) + FDT_TAGALIGN(len)); |
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[175263e] | 300 | if (! prop) |
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| 301 | return -FDT_ERR_NOSPACE; |
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| 302 | |
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| 303 | prop->tag = cpu_to_fdt32(FDT_PROP); |
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| 304 | prop->nameoff = cpu_to_fdt32(nameoff); |
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| 305 | prop->len = cpu_to_fdt32(len); |
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[f984d8f] | 306 | *valp = prop->data; |
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| 307 | return 0; |
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| 308 | } |
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| 309 | |
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| 310 | int fdt_property(void *fdt, const char *name, const void *val, int len) |
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| 311 | { |
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| 312 | void *ptr; |
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| 313 | int ret; |
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| 314 | |
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| 315 | ret = fdt_property_placeholder(fdt, name, len, &ptr); |
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| 316 | if (ret) |
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| 317 | return ret; |
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| 318 | memcpy(ptr, val, len); |
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[175263e] | 319 | return 0; |
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| 320 | } |
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| 321 | |
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| 322 | int fdt_finish(void *fdt) |
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| 323 | { |
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| 324 | char *p = (char *)fdt; |
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| 325 | fdt32_t *end; |
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| 326 | int oldstroffset, newstroffset; |
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| 327 | uint32_t tag; |
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| 328 | int offset, nextoffset; |
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| 329 | |
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[c4267b1] | 330 | FDT_SW_PROBE_STRUCT(fdt); |
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[175263e] | 331 | |
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| 332 | /* Add terminator */ |
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[42f1b37] | 333 | end = fdt_grab_space_(fdt, sizeof(*end)); |
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[175263e] | 334 | if (! end) |
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| 335 | return -FDT_ERR_NOSPACE; |
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| 336 | *end = cpu_to_fdt32(FDT_END); |
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| 337 | |
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| 338 | /* Relocate the string table */ |
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| 339 | oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt); |
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| 340 | newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt); |
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| 341 | memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt)); |
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| 342 | fdt_set_off_dt_strings(fdt, newstroffset); |
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| 343 | |
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| 344 | /* Walk the structure, correcting string offsets */ |
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| 345 | offset = 0; |
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| 346 | while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) { |
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| 347 | if (tag == FDT_PROP) { |
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| 348 | struct fdt_property *prop = |
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[42f1b37] | 349 | fdt_offset_ptr_w_(fdt, offset); |
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[175263e] | 350 | int nameoff; |
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| 351 | |
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| 352 | nameoff = fdt32_to_cpu(prop->nameoff); |
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| 353 | nameoff += fdt_size_dt_strings(fdt); |
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| 354 | prop->nameoff = cpu_to_fdt32(nameoff); |
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| 355 | } |
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| 356 | offset = nextoffset; |
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| 357 | } |
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| 358 | if (nextoffset < 0) |
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| 359 | return nextoffset; |
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| 360 | |
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| 361 | /* Finally, adjust the header */ |
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| 362 | fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt)); |
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| 363 | fdt_set_magic(fdt, FDT_MAGIC); |
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| 364 | return 0; |
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| 365 | } |
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