1 /* 2 * libfdt - Flat Device Tree manipulation 3 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au> 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 #include <fdt.h> 54 #include <libfdt.h> 55 56 #include "libfdt_internal.h" 57 58 int fdt_address_cells(const void *fdt, int nodeoffset) 59 { 60 const fdt32_t *ac; 61 int val; 62 int len; 63 64 ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len); 65 if (!ac) 66 return 2; 67 68 if (len != sizeof(*ac)) 69 return -FDT_ERR_BADNCELLS; 70 71 val = fdt32_to_cpu(*ac); 72 if ((val <= 0) || (val > FDT_MAX_NCELLS)) 73 return -FDT_ERR_BADNCELLS; 74 75 return val; 76 } 77 78 int fdt_size_cells(const void *fdt, int nodeoffset) 79 { 80 const fdt32_t *sc; 81 int val; 82 int len; 83 84 sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len); 85 if (!sc) 86 return 2; 87 88 if (len != sizeof(*sc)) 89 return -FDT_ERR_BADNCELLS; 90 91 val = fdt32_to_cpu(*sc); 92 if ((val < 0) || (val > FDT_MAX_NCELLS)) 93 return -FDT_ERR_BADNCELLS; 94 95 return val; 96 } 97