EmbeddedPkg/Library/FdtLib/fdt_wip.c

   1 /*
   2  * libfdt - Flat Device Tree manipulation
   3  * Copyright (C) 2006 David Gibson, IBM Corporation.
   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
  59 fdt_setprop_inplace_namelen_partial (
  60   void        *fdt,
  61   int         nodeoffset,
  62   const char  *name,
  63   int         namelen,
  64   uint32_t    idx,
  65   const void  *val,
  66   int         len
  67   )
  68 {
  69   void  *propval;
  70   int   proplen;
  71
  72   propval = fdt_getprop_namelen_w (
  73               fdt,
  74               nodeoffset,
  75               name,
  76               namelen,
  77               &proplen
  78               );
  79   if (!propval) {
  80     return proplen;
  81   }
  82
  83   if (proplen < (len + idx)) {
  84     return -FDT_ERR_NOSPACE;
  85   }
  86
  87   memcpy ((char *)propval + idx, val, len);
  88   return 0;
  89 }
  90
  91 int
  92 fdt_setprop_inplace (
  93   void        *fdt,
  94   int         nodeoffset,
  95   const char  *name,
  96   const void  *val,
  97   int         len
  98   )
  99 {
 100   const void  *propval;
 101   int         proplen;
 102
 103   propval = fdt_getprop (fdt, nodeoffset, name, &proplen);
 104   if (!propval) {
 105     return proplen;
 106   }
 107
 108   if (proplen != len) {
 109     return -FDT_ERR_NOSPACE;
 110   }
 111
 112   return fdt_setprop_inplace_namelen_partial (
 113            fdt,
 114            nodeoffset,
 115            name,
 116            strlen (name),
 117            0,
 118            val,
 119            len
 120            );
 121 }
 122
 123 static void
 124 _fdt_nop_region (
 125   void  *start,
 126   int   len
 127   )
 128 {
 129   fdt32_t  *p;
 130
 131   for (p = start; (char *)p < ((char *)start + len); p++) {
 132     *p = cpu_to_fdt32 (FDT_NOP);
 133   }
 134 }
 135
 136 int
 137 fdt_nop_property (
 138   void        *fdt,
 139   int         nodeoffset,
 140   const char  *name
 141   )
 142 {
 143   struct fdt_property  *prop;
 144   int                  len;
 145
 146   prop = fdt_get_property_w (fdt, nodeoffset, name, &len);
 147   if (!prop) {
 148     return len;
 149   }
 150
 151   _fdt_nop_region (prop, len + sizeof (*prop));
 152
 153   return 0;
 154 }
 155
 156 int
 157 _fdt_node_end_offset (
 158   void  *fdt,
 159   int   offset
 160   )
 161 {
 162   int  depth = 0;
 163
 164   while ((offset >= 0) && (depth >= 0)) {
 165     offset = fdt_next_node (fdt, offset, &depth);
 166   }
 167
 168   return offset;
 169 }
 170
 171 int
 172 fdt_nop_node (
 173   void  *fdt,
 174   int   nodeoffset
 175   )
 176 {
 177   int  endoffset;
 178
 179   endoffset = _fdt_node_end_offset (fdt, nodeoffset);
 180   if (endoffset < 0) {
 181     return endoffset;
 182   }
 183
 184   _fdt_nop_region (
 185     fdt_offset_ptr_w (fdt, nodeoffset, 0),
 186     endoffset - nodeoffset
 187     );
 188   return 0;
 189 }