ext/libfdt/fdt_wip.c

   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 #include <fdt.h>
  32 #include <libfdt.h>
  33
  34 #include "libfdt_env.h"
  35 #include "libfdt_internal.h"
  36
  37 int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
  38                         const void *val, int len)
  39 {
  40         void *propval;
  41         int proplen;
  42
  43         propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
  44         if (! propval)
  45                 return proplen;
  46
  47         if (proplen != len)
  48                 return -FDT_ERR_NOSPACE;
  49
  50         memcpy(propval, val, len);
  51         return 0;
  52 }
  53
  54 static void _fdt_nop_region(void *start, int len)
  55 {
  56         fdt32_t *p;
  57
  58         for (p = start; (char *)p < ((char *)start + len); p++)
  59                 *p = cpu_to_fdt32(FDT_NOP);
  60 }
  61
  62 int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
  63 {
  64         struct fdt_property *prop;
  65         int len;
  66
  67         prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
  68         if (! prop)
  69                 return len;
  70
  71         _fdt_nop_region(prop, len + sizeof(*prop));
  72
  73         return 0;
  74 }
  75
  76 int _fdt_node_end_offset(void *fdt, int offset)
  77 {
  78         int depth = 0;
  79
  80         while ((offset >= 0) && (depth >= 0))
  81                 offset = fdt_next_node(fdt, offset, &depth);
  82
  83         return offset;
  84 }
  85
  86 int fdt_nop_node(void *fdt, int nodeoffset)
  87 {
  88         int endoffset;
  89
  90         endoffset = _fdt_node_end_offset(fdt, nodeoffset);
  91         if (endoffset < 0)
  92                 return endoffset;
  93
  94         _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
  95                         endoffset - nodeoffset);
  96         return 0;
  97 }