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
69typedef uint16_t FDT_BITWISE fdt16_t;
70typedef uint32_t FDT_BITWISE fdt32_t;
71typedef 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
82static inline uint16_t fdt16_to_cpu(fdt16_t x)
83{
84 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
85}
86static inline fdt16_t cpu_to_fdt16(uint16_t x)
87{
88 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
89}
90
91static inline uint32_t fdt32_to_cpu(fdt32_t x)
92{
93 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
94}
95static inline fdt32_t cpu_to_fdt32(uint32_t x)
96{
97 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
98}
99
100static inline uint64_t fdt64_to_cpu(fdt64_t x)
101{
102 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
103}
104static 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 */
129static 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