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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, 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 
fdt_setprop_inplace_namelen_partial(void * fdt,int nodeoffset,const char * name,int namelen,uint32_t idx,const void * val,int len)58 int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
59 					const char *name, int namelen,
60 					uint32_t idx, const void *val,
61 					int len)
62 {
63 	void *propval;
64 	int proplen;
65 
66 	propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
67 					&proplen);
68 	if (!propval)
69 		return proplen;
70 
71 	if (proplen < (len + idx))
72 		return -FDT_ERR_NOSPACE;
73 
74 	memcpy((char *)propval + idx, val, len);
75 	return 0;
76 }
77 
fdt_setprop_inplace(void * fdt,int nodeoffset,const char * name,const void * val,int len)78 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
79 			const void *val, int len)
80 {
81 	const void *propval;
82 	int proplen;
83 
84 	propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
85 	if (! propval)
86 		return proplen;
87 
88 	if (proplen != len)
89 		return -FDT_ERR_NOSPACE;
90 
91 	return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
92 						   strlen(name), 0,
93 						   val, len);
94 }
95 
_fdt_nop_region(void * start,int len)96 static void _fdt_nop_region(void *start, int len)
97 {
98 	fdt32_t *p;
99 
100 	for (p = start; (char *)p < ((char *)start + len); p++)
101 		*p = cpu_to_fdt32(FDT_NOP);
102 }
103 
fdt_nop_property(void * fdt,int nodeoffset,const char * name)104 int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
105 {
106 	struct fdt_property *prop;
107 	int len;
108 
109 	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
110 	if (! prop)
111 		return len;
112 
113 	_fdt_nop_region(prop, len + sizeof(*prop));
114 
115 	return 0;
116 }
117 
_fdt_node_end_offset(void * fdt,int offset)118 int _fdt_node_end_offset(void *fdt, int offset)
119 {
120 	int depth = 0;
121 
122 	while ((offset >= 0) && (depth >= 0))
123 		offset = fdt_next_node(fdt, offset, &depth);
124 
125 	return offset;
126 }
127 
fdt_nop_node(void * fdt,int nodeoffset)128 int fdt_nop_node(void *fdt, int nodeoffset)
129 {
130 	int endoffset;
131 
132 	endoffset = _fdt_node_end_offset(fdt, nodeoffset);
133 	if (endoffset < 0)
134 		return endoffset;
135 
136 	_fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
137 			endoffset - nodeoffset);
138 	return 0;
139 }
140