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libfdt_env.h revision 1.2 
      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 #if defined(_KERNEL)
     56 #include <sys/param.h>
     57 #include <sys/types.h>
     58 #else
     59 #include <stddef.h>
     60 #include <stdint.h>
     61 #include <string.h>
     62 #endif
     63 
     64 #ifdef __CHECKER__
     65 #define __force __attribute__((force))
     66 #define __bitwise __attribute__((bitwise))
     67 #else
     68 #define __force
     69 #define __bitwise
     70 #endif
     71 
     72 typedef uint16_t __bitwise fdt16_t;
     73 typedef uint32_t __bitwise fdt32_t;
     74 typedef uint64_t __bitwise fdt64_t;
     75 
     76 #define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
     77 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
     78 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
     79 			 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
     80 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
     81 			 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
     82 			 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
     83 			 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
     84 
     85 static inline uint16_t fdt16_to_cpu(fdt16_t x)
     86 {
     87 	return (__force uint16_t)CPU_TO_FDT16(x);
     88 }
     89 static inline fdt16_t cpu_to_fdt16(uint16_t x)
     90 {
     91 	return (__force fdt16_t)CPU_TO_FDT16(x);
     92 }
     93 
     94 static inline uint32_t fdt32_to_cpu(fdt32_t x)
     95 {
     96 	return (__force uint32_t)CPU_TO_FDT32(x);
     97 }
     98 static inline fdt32_t cpu_to_fdt32(uint32_t x)
     99 {
    100 	return (__force fdt32_t)CPU_TO_FDT32(x);
    101 }
    102 
    103 static inline uint64_t fdt64_to_cpu(fdt64_t x)
    104 {
    105 	return (__force uint64_t)CPU_TO_FDT64(x);
    106 }
    107 static inline fdt64_t cpu_to_fdt64(uint64_t x)
    108 {
    109 	return (__force fdt64_t)CPU_TO_FDT64(x);
    110 }
    111 #undef CPU_TO_FDT64
    112 #undef CPU_TO_FDT32
    113 #undef CPU_TO_FDT16
    114 #undef EXTRACT_BYTE
    115 
    116 #endif /* _LIBFDT_ENV_H */
    117