system76-edk2/EmbeddedPkg/Library/FdtLib/fdt_wip.c

/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 *
 * libfdt is dual licensed: you can use it either under the terms of
 * the GPL, or the BSD license, at your option.
 *
 *  a) This library is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of the
 *     License, or (at your option) any later version.
 *
 *     This library is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public
 *     License along with this library; if not, write to the Free
 *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 *     MA 02110-1301 USA
 *
 * Alternatively,
 *
 *  b) Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *     1. Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *     2. Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "libfdt_env.h"

#include <fdt.h>
#include <libfdt.h>

#include "libfdt_internal.h"

int
fdt_setprop_inplace_namelen_partial (
  void        *fdt,
  int         nodeoffset,
  const char  *name,
  int         namelen,
  uint32_t    idx,
  const void  *val,
  int         len
  )
{
  void  *propval;
  int   proplen;

  propval = fdt_getprop_namelen_w (
              fdt,
              nodeoffset,
              name,
              namelen,
              &proplen
              );
  if (!propval) {
    return proplen;
  }

  if (proplen < (len + idx)) {
    return -FDT_ERR_NOSPACE;
  }

  memcpy ((char *)propval + idx, val, len);
  return 0;
}

int
fdt_setprop_inplace (
  void        *fdt,
  int         nodeoffset,
  const char  *name,
  const void  *val,
  int         len
  )
{
  const void  *propval;
  int         proplen;

  propval = fdt_getprop (fdt, nodeoffset, name, &proplen);
  if (!propval) {
    return proplen;
  }

  if (proplen != len) {
    return -FDT_ERR_NOSPACE;
  }

  return fdt_setprop_inplace_namelen_partial (
           fdt,
           nodeoffset,
           name,
           strlen (name),
           0,
           val,
           len
           );
}

static void
_fdt_nop_region (
  void  *start,
  int   len
  )
{
  fdt32_t  *p;

  for (p = start; (char *)p < ((char *)start + len); p++) {
    *p = cpu_to_fdt32 (FDT_NOP);
  }
}

int
fdt_nop_property (
  void        *fdt,
  int         nodeoffset,
  const char  *name
  )
{
  struct fdt_property  *prop;
  int                  len;

  prop = fdt_get_property_w (fdt, nodeoffset, name, &len);
  if (!prop) {
    return len;
  }

  _fdt_nop_region (prop, len + sizeof (*prop));

  return 0;
}

int
_fdt_node_end_offset (
  void  *fdt,
  int   offset
  )
{
  int  depth = 0;

  while ((offset >= 0) && (depth >= 0)) {
    offset = fdt_next_node (fdt, offset, &depth);
  }

  return offset;
}

int
fdt_nop_node (
  void  *fdt,
  int   nodeoffset
  )
{
  int  endoffset;

  endoffset = _fdt_node_end_offset (fdt, nodeoffset);
  if (endoffset < 0) {
    return endoffset;
  }

  _fdt_nop_region (
    fdt_offset_ptr_w (fdt, nodeoffset, 0),
    endoffset - nodeoffset
    );
  return 0;
}