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