ext/libfdt/libfdt_env.h

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2006 David Gibson, IBM Corporation.
   4  *
   5  *     Redistribution and use in source and binary forms, with or
   6  *     without modification, are permitted provided that the following
   7  *     conditions are met:
   8  *
   9  *     1. Redistributions of source code must retain the above
  10  *        copyright notice, this list of conditions and the following
  11  *        disclaimer.
  12  *     2. Redistributions in binary form must reproduce the above
  13  *        copyright notice, this list of conditions and the following
  14  *        disclaimer in the documentation and/or other materials
  15  *        provided with the distribution.
  16  *
  17  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  18  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  19  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  22  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  28  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  29  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #ifndef _LIBFDT_ENV_H
  32 #define _LIBFDT_ENV_H
  33
  34 #include <stddef.h>
  35 #include <stdint.h>
  36 #include <string.h>
  37
  38 #ifdef __CHECKER__
  39 #define __force __attribute__((force))
  40 #define __bitwise __attribute__((bitwise))
  41 #else
  42 #define __force
  43 #define __bitwise
  44 #endif
  45
  46 typedef uint16_t __bitwise fdt16_t;
  47 typedef uint32_t __bitwise fdt32_t;
  48 typedef uint64_t __bitwise fdt64_t;
  49
  50 #define EXTRACT_BYTE(x, n)      ((unsigned long long)((uint8_t *)&x)[n])
  51 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
  52 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
  53                          (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
  54 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
  55                          (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
  56                          (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
  57                          (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
  58
  59 static inline uint16_t fdt16_to_cpu(fdt16_t x)
  60 {
  61         return (__force uint16_t)CPU_TO_FDT16(x);
  62 }
  63 static inline fdt16_t cpu_to_fdt16(uint16_t x)
  64 {
  65         return (__force fdt16_t)CPU_TO_FDT16(x);
  66 }
  67
  68 static inline uint32_t fdt32_to_cpu(fdt32_t x)
  69 {
  70         return (__force uint32_t)CPU_TO_FDT32(x);
  71 }
  72 static inline fdt32_t cpu_to_fdt32(uint32_t x)
  73 {
  74         return (__force fdt32_t)CPU_TO_FDT32(x);
  75 }
  76
  77 static inline uint64_t fdt64_to_cpu(fdt64_t x)
  78 {
  79         return (__force uint64_t)CPU_TO_FDT64(x);
  80 }
  81 static inline fdt64_t cpu_to_fdt64(uint64_t x)
  82 {
  83         return (__force fdt64_t)CPU_TO_FDT64(x);
  84 }
  85 #undef CPU_TO_FDT64
  86 #undef CPU_TO_FDT32
  87 #undef CPU_TO_FDT16
  88 #undef EXTRACT_BYTE
  89
  90 #endif /* _LIBFDT_ENV_H */