libfdt_env.h 2.7 KB

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