scripts/dtc/libfdt/libfdt_env.h

   1 #ifndef LIBFDT_ENV_H
   2 #define LIBFDT_ENV_H
   3 /*
   4  * libfdt - Flat Device Tree manipulation
   5  * Copyright (C) 2006 David Gibson, IBM Corporation.
   6  * Copyright 2012 Kim Phillips, Freescale Semiconductor.
   7  *
   8  * libfdt is dual licensed: you can use it either under the terms of
   9  * the GPL, or the BSD license, at your option.
  10  *
  11  *  a) This library is free software; you can redistribute it and/or
  12  *     modify it under the terms of the GNU General Public License as
  13  *     published by the Free Software Foundation; either version 2 of the
  14  *     License, or (at your option) any later version.
  15  *
  16  *     This library is distributed in the hope that it will be useful,
  17  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *     GNU General Public License for more details.
  20  *
  21  *     You should have received a copy of the GNU General Public
  22  *     License along with this library; if not, write to the Free
  23  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  24  *     MA 02110-1301 USA
  25  *
  26  * Alternatively,
  27  *
  28  *  b) Redistribution and use in source and binary forms, with or
  29  *     without modification, are permitted provided that the following
  30  *     conditions are met:
  31  *
  32  *     1. Redistributions of source code must retain the above
  33  *        copyright notice, this list of conditions and the following
  34  *        disclaimer.
  35  *     2. Redistributions in binary form must reproduce the above
  36  *        copyright notice, this list of conditions and the following
  37  *        disclaimer in the documentation and/or other materials
  38  *        provided with the distribution.
  39  *
  40  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  41  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  42  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  43  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  44  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  45  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  46  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  47  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  48  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  50  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  51  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  52  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  53  */
  54
  55 #include <stddef.h>
  56 #include <stdint.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <limits.h>
  60
  61 #ifdef __CHECKER__
  62 #define FDT_FORCE __attribute__((force))
  63 #define FDT_BITWISE __attribute__((bitwise))
  64 #else
  65 #define FDT_FORCE
  66 #define FDT_BITWISE
  67 #endif
  68
  69 typedef uint16_t FDT_BITWISE fdt16_t;
  70 typedef uint32_t FDT_BITWISE fdt32_t;
  71 typedef uint64_t FDT_BITWISE fdt64_t;
  72
  73 #define EXTRACT_BYTE(x, n)      ((unsigned long long)((uint8_t *)&x)[n])
  74 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
  75 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
  76                          (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
  77 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
  78                          (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
  79                          (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
  80                          (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
  81
  82 static inline uint16_t fdt16_to_cpu(fdt16_t x)
  83 {
  84         return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
  85 }
  86 static inline fdt16_t cpu_to_fdt16(uint16_t x)
  87 {
  88         return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
  89 }
  90
  91 static inline uint32_t fdt32_to_cpu(fdt32_t x)
  92 {
  93         return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
  94 }
  95 static inline fdt32_t cpu_to_fdt32(uint32_t x)
  96 {
  97         return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
  98 }
  99
 100 static inline uint64_t fdt64_to_cpu(fdt64_t x)
 101 {
 102         return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
 103 }
 104 static inline fdt64_t cpu_to_fdt64(uint64_t x)
 105 {
 106         return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
 107 }
 108 #undef CPU_TO_FDT64
 109 #undef CPU_TO_FDT32
 110 #undef CPU_TO_FDT16
 111 #undef EXTRACT_BYTE
 112
 113 #ifdef __APPLE__
 114 #include <AvailabilityMacros.h>
 115
 116 /* strnlen() is not available on Mac OS < 10.7 */
 117 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
 118                                          MAC_OS_X_VERSION_10_7)
 119
 120 #define strnlen fdt_strnlen
 121
 122 /*
 123  * fdt_strnlen: returns the length of a string or max_count - which ever is
 124  * smallest.
 125  * Input 1 string: the string whose size is to be determined
 126  * Input 2 max_count: the maximum value returned by this function
 127  * Output: length of the string or max_count (the smallest of the two)
 128  */
 129 static inline size_t fdt_strnlen(const char *string, size_t max_count)
 130 {
 131     const char *p = memchr(string, 0, max_count);
 132     return p ? p - string : max_count;
 133 }
 134
 135 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
 136           MAC_OS_X_VERSION_10_7) */
 137
 138 #endif /* __APPLE__ */
 139
 140 #endif /* LIBFDT_ENV_H */