1 /*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
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, see <http://www.gnu.org/licenses/>.
20 *
21 * Alternatively,
22 *
23 * b) Redistribution and use in source and binary forms, with or
24 * without modification, are permitted provided that the following
25 * conditions are met:
26 *
27 * 1. Redistributions of source code must retain the above
28 * copyright notice, this list of conditions and the following
29 * disclaimer.
30 * 2. Redistributions in binary form must reproduce the above
31 * copyright notice, this list of conditions and the following
32 * disclaimer in the documentation and/or other materials
33 * provided with the distribution.
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
36 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
37 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
38 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
40 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
45 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
46 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
47 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 */
49 #include "libfdt_env.h"
50
51 #include <fdt.h>
52 #include <libfdt.h>
53
54 #include "libfdt_internal.h"
55
fdt_setprop_inplace(void * fdt,int nodeoffset,const char * name,const void * val,int len)56 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
57 const void *val, int len)
58 {
59 void *propval;
60 int proplen;
61
62 propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
63 if (! propval)
64 return proplen;
65
66 if (proplen != len)
67 return -FDT_ERR_NOSPACE;
68
69 memcpy(propval, val, len);
70 return 0;
71 }
72
_fdt_nop_region(void * start,int len)73 static void _fdt_nop_region(void *start, int len)
74 {
75 fdt32_t *p;
76
77 for (p = start; (char *)p < ((char *)start + len); p++)
78 *p = cpu_to_fdt32(FDT_NOP);
79 }
80
fdt_nop_property(void * fdt,int nodeoffset,const char * name)81 int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
82 {
83 struct fdt_property *prop;
84 int len;
85
86 prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
87 if (! prop)
88 return len;
89
90 _fdt_nop_region(prop, len + sizeof(*prop));
91
92 return 0;
93 }
94
_fdt_node_end_offset(void * fdt,int offset)95 int _fdt_node_end_offset(void *fdt, int offset)
96 {
97 int depth = 0;
98
99 while ((offset >= 0) && (depth >= 0))
100 offset = fdt_next_node(fdt, offset, &depth);
101
102 return offset;
103 }
104
fdt_nop_node(void * fdt,int nodeoffset)105 int fdt_nop_node(void *fdt, int nodeoffset)
106 {
107 int endoffset;
108
109 endoffset = _fdt_node_end_offset(fdt, nodeoffset);
110 if (endoffset < 0)
111 return endoffset;
112
113 _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
114 endoffset - nodeoffset);
115 return 0;
116 }
117