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 | |
38 | static inline uint16_t fdt16_to_cpu(fdt16_t x) |
39 | { |
40 | return (FDT_FORCE uint16_t)CPU_TO_FDT16(x); |
41 | } |
42 | static inline fdt16_t cpu_to_fdt16(uint16_t x) |
43 | { |
44 | return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x); |
45 | } |
46 | |
47 | static inline uint32_t fdt32_to_cpu(fdt32_t x) |
48 | { |
49 | return (FDT_FORCE uint32_t)CPU_TO_FDT32(x); |
50 | } |
51 | static inline fdt32_t cpu_to_fdt32(uint32_t x) |
52 | { |
53 | return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x); |
54 | } |
55 | |
56 | static inline uint64_t fdt64_to_cpu(fdt64_t x) |
57 | { |
58 | return (FDT_FORCE uint64_t)CPU_TO_FDT64(x); |
59 | } |
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 | */ |
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 | |