scripts/dtc/libfdt/libfdt_env.h

   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 */