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
60 #ifdef __CHECKER__
61 #define FDT_FORCE __attribute__((force))
62 #define FDT_BITWISE __attribute__((bitwise))
63 #else
64 #define FDT_FORCE
65 #define FDT_BITWISE
66 #endif
67
68 typedef uint16_t FDT_BITWISE fdt16_t;
69 typedef uint32_t FDT_BITWISE fdt32_t;
70 typedef uint64_t FDT_BITWISE fdt64_t;
71
72 #define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n])
73 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
74 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
75 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
76 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
77 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
78 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
79 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
80
fdt16_to_cpu(fdt16_t x)81 static inline uint16_t fdt16_to_cpu(fdt16_t x)
82 {
83 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
84 }
cpu_to_fdt16(uint16_t x)85 static inline fdt16_t cpu_to_fdt16(uint16_t x)
86 {
87 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
88 }
89
fdt32_to_cpu(fdt32_t x)90 static inline uint32_t fdt32_to_cpu(fdt32_t x)
91 {
92 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
93 }
cpu_to_fdt32(uint32_t x)94 static inline fdt32_t cpu_to_fdt32(uint32_t x)
95 {
96 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
97 }
98
fdt64_to_cpu(fdt64_t x)99 static inline uint64_t fdt64_to_cpu(fdt64_t x)
100 {
101 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
102 }
cpu_to_fdt64(uint64_t x)103 static inline fdt64_t cpu_to_fdt64(uint64_t x)
104 {
105 return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
106 }
107 #undef CPU_TO_FDT64
108 #undef CPU_TO_FDT32
109 #undef CPU_TO_FDT16
110 #undef EXTRACT_BYTE
111
112 #ifdef __APPLE__
113 #include <AvailabilityMacros.h>
114
115 /* strnlen() is not available on Mac OS < 10.7 */
116 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
117 MAC_OS_X_VERSION_10_7)
118
119 #define strnlen fdt_strnlen
120
121 /*
122 * fdt_strnlen: returns the length of a string or max_count - which ever is
123 * smallest.
124 * Input 1 string: the string whose size is to be determined
125 * Input 2 max_count: the maximum value returned by this function
126 * Output: length of the string or max_count (the smallest of the two)
127 */
fdt_strnlen(const char * string,size_t max_count)128 static inline size_t fdt_strnlen(const char *string, size_t max_count)
129 {
130 const char *p = memchr(string, 0, max_count);
131 return p ? p - string : max_count;
132 }
133
134 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
135 MAC_OS_X_VERSION_10_7) */
136
137 #endif /* __APPLE__ */
138
139 #endif /* LIBFDT_ENV_H */
140