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1/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
2#ifndef LIBFDT_ENV_H
3#define LIBFDT_ENV_H
4/*
5 * libfdt - Flat Device Tree manipulation
6 * Copyright (C) 2006 David Gibson, IBM Corporation.
7 * Copyright 2012 Kim Phillips, Freescale Semiconductor.
8 */
9
10#include <stdbool.h>
11#include <stddef.h>
12#include <stdint.h>
13#include <stdlib.h>
14#include <string.h>
15#include <limits.h>
16
17#ifdef __CHECKER__
18#define FDT_FORCE __attribute__((force))
19#define FDT_BITWISE __attribute__((bitwise))
20#else
21#define FDT_FORCE
22#define FDT_BITWISE
23#endif
24
25typedef uint16_t FDT_BITWISE fdt16_t;
26typedef uint32_t FDT_BITWISE fdt32_t;
27typedef uint64_t FDT_BITWISE fdt64_t;
28
29#define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n])
30#define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
31#define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
32 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
33#define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
34 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
35 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
36 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
37
38static inline uint16_t fdt16_to_cpu(fdt16_t x)
39{
40 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
41}
42static inline fdt16_t cpu_to_fdt16(uint16_t x)
43{
44 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
45}
46
47static inline uint32_t fdt32_to_cpu(fdt32_t x)
48{
49 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
50}
51static inline fdt32_t cpu_to_fdt32(uint32_t x)
52{
53 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
54}
55
56static inline uint64_t fdt64_to_cpu(fdt64_t x)
57{
58 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
59}
60static inline fdt64_t cpu_to_fdt64(uint64_t x)
61{
62 return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
63}
64#undef CPU_TO_FDT64
65#undef CPU_TO_FDT32
66#undef CPU_TO_FDT16
67#undef EXTRACT_BYTE
68
69#ifdef __APPLE__
70#include <AvailabilityMacros.h>
71
72/* strnlen() is not available on Mac OS < 10.7 */
73# if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
74 MAC_OS_X_VERSION_10_7)
75
76#define strnlen fdt_strnlen
77
78/*
79 * fdt_strnlen: returns the length of a string or max_count - which ever is
80 * smallest.
81 * Input 1 string: the string whose size is to be determined
82 * Input 2 max_count: the maximum value returned by this function
83 * Output: length of the string or max_count (the smallest of the two)
84 */
85static inline size_t fdt_strnlen(const char *string, size_t max_count)
86{
87 const char *p = memchr(string, 0, max_count);
88 return p ? p - string : max_count;
89}
90
91#endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
92 MAC_OS_X_VERSION_10_7) */
93
94#endif /* __APPLE__ */
95
96#endif /* LIBFDT_ENV_H */
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
68typedef uint16_t FDT_BITWISE fdt16_t;
69typedef uint32_t FDT_BITWISE fdt32_t;
70typedef 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
81static inline uint16_t fdt16_to_cpu(fdt16_t x)
82{
83 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
84}
85static inline fdt16_t cpu_to_fdt16(uint16_t x)
86{
87 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
88}
89
90static inline uint32_t fdt32_to_cpu(fdt32_t x)
91{
92 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
93}
94static inline fdt32_t cpu_to_fdt32(uint32_t x)
95{
96 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
97}
98
99static inline uint64_t fdt64_to_cpu(fdt64_t x)
100{
101 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
102}
103static 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 */
128static 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 */