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
25 typedef uint16_t FDT_BITWISE fdt16_t;
26 typedef uint32_t FDT_BITWISE fdt32_t;
27 typedef 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
fdt16_to_cpu(fdt16_t x)38 static inline uint16_t fdt16_to_cpu(fdt16_t x)
39 {
40 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
41 }
cpu_to_fdt16(uint16_t x)42 static inline fdt16_t cpu_to_fdt16(uint16_t x)
43 {
44 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
45 }
46
fdt32_to_cpu(fdt32_t x)47 static inline uint32_t fdt32_to_cpu(fdt32_t x)
48 {
49 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
50 }
cpu_to_fdt32(uint32_t x)51 static inline fdt32_t cpu_to_fdt32(uint32_t x)
52 {
53 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
54 }
55
fdt64_to_cpu(fdt64_t x)56 static inline uint64_t fdt64_to_cpu(fdt64_t x)
57 {
58 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
59 }
cpu_to_fdt64(uint64_t x)60 static 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 */
fdt_strnlen(const char * string,size_t max_count)85 static 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 */
97