1 /* $NetBSD: libfdt_env.h,v 1.5 2019/12/22 12:33:17 skrll Exp $ */
2
3 /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
4 #ifndef LIBFDT_ENV_H
5 #define LIBFDT_ENV_H
6 /*
7 * libfdt - Flat Device Tree manipulation
8 * Copyright (C) 2006 David Gibson, IBM Corporation.
9 * Copyright 2012 Kim Phillips, Freescale Semiconductor.
10 */
11
12 #if defined(_KERNEL) || defined(_STANDALONE)
13 #include <sys/param.h>
14 #include <sys/types.h>
15 #include <lib/libkern/libkern.h>
16 #else
17 #include <stdbool.h>
18 #include <stddef.h>
19 #include <stdint.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <limits.h>
23 #endif
24
25 #ifdef __CHECKER__
26 #define FDT_FORCE __attribute__((force))
27 #define FDT_BITWISE __attribute__((bitwise))
28 #else
29 #define FDT_FORCE
30 #define FDT_BITWISE
31 #endif
32
33 typedef uint16_t FDT_BITWISE fdt16_t;
34 typedef uint32_t FDT_BITWISE fdt32_t;
35 typedef uint64_t FDT_BITWISE fdt64_t;
36
37 #define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n])
38 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
39 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
40 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
41 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
42 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
43 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
44 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
45
fdt16_to_cpu(fdt16_t x)46 static inline uint16_t fdt16_to_cpu(fdt16_t x)
47 {
48 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
49 }
cpu_to_fdt16(uint16_t x)50 static inline fdt16_t cpu_to_fdt16(uint16_t x)
51 {
52 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
53 }
54
fdt32_to_cpu(fdt32_t x)55 static inline uint32_t fdt32_to_cpu(fdt32_t x)
56 {
57 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
58 }
cpu_to_fdt32(uint32_t x)59 static inline fdt32_t cpu_to_fdt32(uint32_t x)
60 {
61 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
62 }
63
fdt64_to_cpu(fdt64_t x)64 static inline uint64_t fdt64_to_cpu(fdt64_t x)
65 {
66 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
67 }
cpu_to_fdt64(uint64_t x)68 static inline fdt64_t cpu_to_fdt64(uint64_t x)
69 {
70 return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
71 }
72 #undef CPU_TO_FDT64
73 #undef CPU_TO_FDT32
74 #undef CPU_TO_FDT16
75 #undef EXTRACT_BYTE
76
77 #ifdef __APPLE__
78 #include <AvailabilityMacros.h>
79
80 /* strnlen() is not available on Mac OS < 10.7 */
81 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
82 MAC_OS_X_VERSION_10_7)
83
84 #define strnlen fdt_strnlen
85
86 /*
87 * fdt_strnlen: returns the length of a string or max_count - which ever is
88 * smallest.
89 * Input 1 string: the string whose size is to be determined
90 * Input 2 max_count: the maximum value returned by this function
91 * Output: length of the string or max_count (the smallest of the two)
92 */
fdt_strnlen(const char * string,size_t max_count)93 static inline size_t fdt_strnlen(const char *string, size_t max_count)
94 {
95 const char *p = memchr(string, 0, max_count);
96 return p ? p - string : max_count;
97 }
98
99 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
100 MAC_OS_X_VERSION_10_7) */
101
102 #endif /* __APPLE__ */
103
104 #endif /* LIBFDT_ENV_H */
105