xref: /linux/scripts/dtc/libfdt/libfdt_env.h (revision 9f7d35d9f7a184ffb591b090b2cbf63d2d599c02)
1 #ifndef LIBFDT_ENV_H
2 #define LIBFDT_ENV_H
3 /*
4  * libfdt - Flat Device Tree manipulation
5  * Copyright (C) 2006 David Gibson, IBM Corporation.
6  * Copyright 2012 Kim Phillips, Freescale Semiconductor.
7  *
8  * libfdt is dual licensed: you can use it either under the terms of
9  * the GPL, or the BSD license, at your option.
10  *
11  *  a) This library is free software; you can redistribute it and/or
12  *     modify it under the terms of the GNU General Public License as
13  *     published by the Free Software Foundation; either version 2 of the
14  *     License, or (at your option) any later version.
15  *
16  *     This library is distributed in the hope that it will be useful,
17  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
18  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  *     GNU General Public License for more details.
20  *
21  *     You should have received a copy of the GNU General Public
22  *     License along with this library; if not, write to the Free
23  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
24  *     MA 02110-1301 USA
25  *
26  * Alternatively,
27  *
28  *  b) Redistribution and use in source and binary forms, with or
29  *     without modification, are permitted provided that the following
30  *     conditions are met:
31  *
32  *     1. Redistributions of source code must retain the above
33  *        copyright notice, this list of conditions and the following
34  *        disclaimer.
35  *     2. Redistributions in binary form must reproduce the above
36  *        copyright notice, this list of conditions and the following
37  *        disclaimer in the documentation and/or other materials
38  *        provided with the distribution.
39  *
40  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
41  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
42  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
43  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
45  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
47  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
48  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
50  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
51  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
52  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
53  */
54 
55 #include <stddef.h>
56 #include <stdint.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <limits.h>
60 
61 #ifdef __CHECKER__
62 #define FDT_FORCE __attribute__((force))
63 #define FDT_BITWISE __attribute__((bitwise))
64 #else
65 #define FDT_FORCE
66 #define FDT_BITWISE
67 #endif
68 
69 typedef uint16_t FDT_BITWISE fdt16_t;
70 typedef uint32_t FDT_BITWISE fdt32_t;
71 typedef uint64_t FDT_BITWISE fdt64_t;
72 
73 #define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
74 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
75 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
76 			 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
77 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
78 			 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
79 			 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
80 			 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
81 
82 static inline uint16_t fdt16_to_cpu(fdt16_t x)
83 {
84 	return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
85 }
86 static inline fdt16_t cpu_to_fdt16(uint16_t x)
87 {
88 	return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
89 }
90 
91 static inline uint32_t fdt32_to_cpu(fdt32_t x)
92 {
93 	return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
94 }
95 static inline fdt32_t cpu_to_fdt32(uint32_t x)
96 {
97 	return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
98 }
99 
100 static inline uint64_t fdt64_to_cpu(fdt64_t x)
101 {
102 	return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
103 }
104 static inline fdt64_t cpu_to_fdt64(uint64_t x)
105 {
106 	return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
107 }
108 #undef CPU_TO_FDT64
109 #undef CPU_TO_FDT32
110 #undef CPU_TO_FDT16
111 #undef EXTRACT_BYTE
112 
113 #ifdef __APPLE__
114 #include <AvailabilityMacros.h>
115 
116 /* strnlen() is not available on Mac OS < 10.7 */
117 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
118                                          MAC_OS_X_VERSION_10_7)
119 
120 #define strnlen fdt_strnlen
121 
122 /*
123  * fdt_strnlen: returns the length of a string or max_count - which ever is
124  * smallest.
125  * Input 1 string: the string whose size is to be determined
126  * Input 2 max_count: the maximum value returned by this function
127  * Output: length of the string or max_count (the smallest of the two)
128  */
129 static inline size_t fdt_strnlen(const char *string, size_t max_count)
130 {
131     const char *p = memchr(string, 0, max_count);
132     return p ? p - string : max_count;
133 }
134 
135 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
136           MAC_OS_X_VERSION_10_7) */
137 
138 #endif /* __APPLE__ */
139 
140 #endif /* LIBFDT_ENV_H */
141