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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58 | static int fdt_sw_probe_(void *fdt) |
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59 | { |
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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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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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67 | #define FDT_SW_PROBE(fdt) \ |
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68 | { \ |
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69 | int err; \ |
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70 | if ((err = fdt_sw_probe_(fdt)) != 0) \ |
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71 | return err; \ |
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72 | } |
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73 | |
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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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129 | static void *fdt_grab_space_(void *fdt, size_t len) |
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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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141 | return fdt_offset_ptr_w_(fdt, offset); |
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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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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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148 | void *fdt = buf; |
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149 | |
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150 | if (bufsize < hdrsize) |
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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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160 | fdt_set_off_mem_rsvmap(fdt, hdrsize); |
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161 | fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt)); |
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162 | fdt_set_off_dt_strings(fdt, 0); |
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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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172 | FDT_SW_PROBE(fdt); |
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173 | |
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174 | headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt); |
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175 | tailsize = fdt_size_dt_strings(fdt); |
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176 | |
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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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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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197 | if (fdt_off_dt_strings(buf)) |
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198 | fdt_set_off_dt_strings(buf, bufsize); |
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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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208 | FDT_SW_PROBE_MEMRSV(fdt); |
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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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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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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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237 | int namelen; |
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238 | |
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239 | FDT_SW_PROBE_STRUCT(fdt); |
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240 | |
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241 | namelen = strlen(name) + 1; |
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242 | nh = fdt_grab_space_(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen)); |
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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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255 | FDT_SW_PROBE_STRUCT(fdt); |
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256 | |
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257 | en = fdt_grab_space_(fdt, FDT_TAGSIZE); |
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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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265 | static int fdt_find_add_string_(void *fdt, const char *s) |
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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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273 | p = fdt_find_string_(strtab - strtabsize, strtabsize, s); |
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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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288 | int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp) |
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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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293 | FDT_SW_PROBE_STRUCT(fdt); |
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294 | |
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295 | nameoff = fdt_find_add_string_(fdt, name); |
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296 | if (nameoff == 0) |
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297 | return -FDT_ERR_NOSPACE; |
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298 | |
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299 | prop = fdt_grab_space_(fdt, sizeof(*prop) + FDT_TAGALIGN(len)); |
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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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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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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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330 | FDT_SW_PROBE_STRUCT(fdt); |
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331 | |
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332 | /* Add terminator */ |
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333 | end = fdt_grab_space_(fdt, sizeof(*end)); |
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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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349 | fdt_offset_ptr_w_(fdt, offset); |
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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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