fdt_addresses.c

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    1 /*
    2  * libfdt - Flat Device Tree manipulation
    3  * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
    4  *
    5  * libfdt is dual licensed: you can use it either under the terms of
    6  * the GPL, or the BSD license, at your option.
    7  *
    8  *  a) This library is free software; you can redistribute it and/or
    9  *     modify it under the terms of the GNU General Public License as
   10  *     published by the Free Software Foundation; either version 2 of the
   11  *     License, or (at your option) any later version.
   12  *
   13  *     This library is distributed in the hope that it will be useful,
   14  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   15  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   16  *     GNU General Public License for more details.
   17  *
   18  *     You should have received a copy of the GNU General Public
   19  *     License along with this library; if not, write to the Free
   20  *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
   21  *     MA 02110-1301 USA
   22  *
   23  * Alternatively,
   24  *
   25  *  b) Redistribution and use in source and binary forms, with or
   26  *     without modification, are permitted provided that the following
   27  *     conditions are met:
   28  *
   29  *     1. Redistributions of source code must retain the above
   30  *        copyright notice, this list of conditions and the following
   31  *        disclaimer.
   32  *     2. Redistributions in binary form must reproduce the above
   33  *        copyright notice, this list of conditions and the following
   34  *        disclaimer in the documentation and/or other materials
   35  *        provided with the distribution.
   36  *
   37  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   38  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   39  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   40  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   41  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   42  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   43  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   44  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   45  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   46  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   47  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   48  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   49  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   50  */
   51 #include "libfdt_env.h"
   52 
   53 #include <fdt.h>
   54 #include <libfdt.h>
   55 
   56 #include "libfdt_internal.h"
   57 
   58 int fdt_address_cells(const void *fdt, int nodeoffset)
   59 {
   60         const fdt32_t *ac;
   61         int val;
   62         int len;
   63 
   64         ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
   65         if (!ac)
   66                 return 2;
   67 
   68         if (len != sizeof(*ac))
   69                 return -FDT_ERR_BADNCELLS;
   70 
   71         val = fdt32_to_cpu(*ac);
   72         if ((val <= 0) || (val > FDT_MAX_NCELLS))
   73                 return -FDT_ERR_BADNCELLS;
   74 
   75         return val;
   76 }
   77 
   78 int fdt_size_cells(const void *fdt, int nodeoffset)
   79 {
   80         const fdt32_t *sc;
   81         int val;
   82         int len;
   83 
   84         sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
   85         if (!sc)
   86                 return 2;
   87 
   88         if (len != sizeof(*sc))
   89                 return -FDT_ERR_BADNCELLS;
   90 
   91         val = fdt32_to_cpu(*sc);
   92         if ((val < 0) || (val > FDT_MAX_NCELLS))
   93                 return -FDT_ERR_BADNCELLS;
   94 
   95         return val;
   96 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/libfdt/fdt_addresses.c

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sys/contrib/libfdt/fdt_addresses.c