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libfdt - library for manipulating device trees in flattened format

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Initial revision, read-only and "in-place" (no memmove() required)
write operations only.
This commit is contained in:
David Gibson 2006-11-27 16:21:28 +11:00
commit 3da0f9a10d
25 changed files with 1868 additions and 0 deletions
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fdt_wip.c Normal file
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/*
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2006 David Gibson, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include "libfdt_env.h"
#include <fdt.h>
#include <libfdt.h>
#include "libfdt_internal.h"
int fdt_setprop_inplace(struct fdt_header *fdt, int nodeoffset, const char *name,
const void *val, int len)
{
void *propval;
int proplen;
int err;
propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
if ((err = fdt_ptr_error(propval)))
return err;
if (proplen != len)
return FDT_ERR_SIZE_MISMATCH;
memcpy(propval, val, len);
return 0;
}
static void nop_region(void *start, int len)
{
uint32_t *p;
for (p = start; (void *)p < (start + len); p++)
*p = FDT_NOP;
}
int fdt_nop_property(struct fdt_header *fdt, int nodeoffset, const char *name)
{
struct fdt_property *prop;
int len;
int err;
prop = _fdt_getprop(fdt, nodeoffset, name, &len);
if ((err = fdt_ptr_error(prop)))
return err;
nop_region(prop, len + sizeof(*prop));
return 0;
}
int fdt_nop_node(struct fdt_header *fdt, int nodeoffset)
{
int level = 0;
int err = 0;
uint32_t tag;
int offset, nextoffset;
tag = _fdt_next_tag(fdt, nodeoffset, &nextoffset);
if (tag != FDT_BEGIN_NODE)
return FDT_ERR_BADOFFSET;
do {
offset = nextoffset;
tag = _fdt_next_tag(fdt, offset, &nextoffset);
switch (tag) {
case FDT_END:
level = -1;
err = FDT_ERR_TRUNCATED;
break;
case FDT_BEGIN_NODE:
level++;
break;
case FDT_END_NODE:
level--;
break;
case FDT_PROP:
case FDT_NOP:
break;
default:
return FDT_ERR_BADSTRUCTURE;
}
} while (level >= 0);
nop_region(fdt_offset_ptr(fdt, nodeoffset, 0), nextoffset - nodeoffset);
return err;
}