1 // SPDX-License-Identifier: (BSD-2-Clause OR GPL-2.0+) 2 /* 3 * libfdt - Flat Device Tree manipulation 4 * Copyright (C) 2006 David Gibson, IBM Corporation. 5 * 6 * libfdt is dual licensed: you can use it either under the terms of 7 * the GPL, or the BSD license, at your option. 8 * 9 * a) This library is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of the 12 * License, or (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public 20 * License along with this library; if not, write to the Free 21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, 22 * MA 02110-1301 USA 23 * 24 * Alternatively, 25 * 26 * b) Redistribution and use in source and binary forms, with or 27 * without modification, are permitted provided that the following 28 * conditions are met: 29 * 30 * 1. Redistributions of source code must retain the above 31 * copyright notice, this list of conditions and the following 32 * disclaimer. 33 * 2. Redistributions in binary form must reproduce the above 34 * copyright notice, this list of conditions and the following 35 * disclaimer in the documentation and/or other materials 36 * provided with the distribution. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 39 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 40 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 41 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 42 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 48 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 49 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 50 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 51 */ 52 #include "libfdt_env.h" 53 54 #include <fdt.h> 55 #include <libfdt.h> 56 57 #include "libfdt_internal.h" 58 59 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, 60 const void *val, int len) 61 { 62 void *propval; 63 int proplen; 64 65 propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen); 66 if (! propval) 67 return proplen; 68 69 if (proplen != len) 70 return -FDT_ERR_NOSPACE; 71 72 memcpy(propval, val, len); 73 return 0; 74 } 75 76 static void _fdt_nop_region(void *start, int len) 77 { 78 fdt32_t *p; 79 80 for (p = start; (char *)p < ((char *)start + len); p++) 81 *p = cpu_to_fdt32(FDT_NOP); 82 } 83 84 int fdt_nop_property(void *fdt, int nodeoffset, const char *name) 85 { 86 struct fdt_property *prop; 87 int len; 88 89 prop = fdt_get_property_w(fdt, nodeoffset, name, &len); 90 if (! prop) 91 return len; 92 93 _fdt_nop_region(prop, len + sizeof(*prop)); 94 95 return 0; 96 } 97 98 int _fdt_node_end_offset(void *fdt, int offset) 99 { 100 int depth = 0; 101 102 while ((offset >= 0) && (depth >= 0)) 103 offset = fdt_next_node(fdt, offset, &depth); 104 105 return offset; 106 } 107 108 int fdt_nop_node(void *fdt, int nodeoffset) 109 { 110 int endoffset; 111 112 endoffset = _fdt_node_end_offset(fdt, nodeoffset); 113 if (endoffset < 0) 114 return endoffset; 115 116 _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0), 117 endoffset - nodeoffset); 118 return 0; 119 } 120