blob: b33fbf45debd7c1c27bf4903bb6cac61aa8246e0 [file] [log] [blame]
/*
* 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"
static int rw_check_header(void *fdt)
{
int err;
if ((err = _fdt_check_header(fdt)))
return err;
if (fdt_version(fdt) < 0x11)
return -FDT_ERR_BADVERSION;
if (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8))
return -FDT_ERR_BADLAYOUT;
if (fdt_off_dt_struct(fdt) <
(fdt_off_mem_rsvmap(fdt) + sizeof(struct fdt_reserve_entry)))
return -FDT_ERR_BADLAYOUT;
if (fdt_off_dt_strings(fdt) <
(fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt)))
return -FDT_ERR_BADLAYOUT;
if (fdt_totalsize(fdt) <
(fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)))
return -FDT_ERR_BADLAYOUT;
return 0;
}
#define RW_CHECK_HEADER(fdt) \
{ \
int err; \
if ((err = rw_check_header(fdt)) != 0) \
return err; \
}
static inline int _blob_data_size(void *fdt)
{
return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
}
static int _blob_splice(void *fdt, void *p, int oldlen, int newlen)
{
void *end = fdt + _blob_data_size(fdt);
if (((p + oldlen) < p) || ((p + oldlen) > end))
return -FDT_ERR_BADOFFSET;
if ((end - oldlen + newlen) > (fdt + fdt_totalsize(fdt)))
return -FDT_ERR_NOSPACE;
memmove(p + newlen, p + oldlen, end - p - oldlen);
return 0;
}
static int _blob_splice_struct(void *fdt, void *p,
int oldlen, int newlen)
{
int delta = newlen - oldlen;
int err;
if ((err = _blob_splice(fdt, p, oldlen, newlen)))
return err;
fdt_set_header(fdt, size_dt_struct, fdt_size_dt_struct(fdt) + delta);
fdt_set_header(fdt, off_dt_strings, fdt_off_dt_strings(fdt) + delta);
return 0;
}
static int _blob_splice_string(void *fdt, int newlen)
{
void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
int err;
if ((err = _blob_splice(fdt, p, 0, newlen)))
return err;
fdt_set_header(fdt, size_dt_strings, fdt_size_dt_strings(fdt) + newlen);
return 0;
}
static int _find_add_string(void *fdt, const char *s)
{
char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
const char *p;
char *new;
int len = strlen(s) + 1;
int err;
p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
if (p)
/* found it */
return (p - strtab);
new = strtab + fdt_size_dt_strings(fdt);
err = _blob_splice_string(fdt, len);
if (err)
return err;
memcpy(new, s, len);
return (new - strtab);
}
static int _resize_property(void *fdt, int nodeoffset, const char *name, int len,
struct fdt_property **prop)
{
int oldlen;
int err;
*prop = fdt_get_property(fdt, nodeoffset, name, &oldlen);
if (! (*prop))
return oldlen;
if ((err = _blob_splice_struct(fdt, (*prop)->data,
ALIGN(oldlen, FDT_TAGSIZE),
ALIGN(len, FDT_TAGSIZE))))
return err;
(*prop)->len = cpu_to_fdt32(len);
return 0;
}
static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
struct fdt_property **prop)
{
uint32_t tag;
int proplen;
int nextoffset;
int namestroff;
int err;
tag = fdt_next_tag(fdt, nodeoffset, &nextoffset, NULL);
if (tag != FDT_BEGIN_NODE)
return -FDT_ERR_BADOFFSET;
namestroff = _find_add_string(fdt, name);
if (namestroff < 0)
return namestroff;
*prop = _fdt_offset_ptr(fdt, nextoffset);
proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE);
err = _blob_splice_struct(fdt, *prop, 0, proplen);
if (err)
return err;
(*prop)->tag = cpu_to_fdt32(FDT_PROP);
(*prop)->nameoff = cpu_to_fdt32(namestroff);
(*prop)->len = cpu_to_fdt32(len);
return 0;
}
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
{
struct fdt_property *prop;
int err;
if ((err = rw_check_header(fdt)))
return err;
err = _resize_property(fdt, nodeoffset, name, len, &prop);
if (err == -FDT_ERR_NOTFOUND)
err = _add_property(fdt, nodeoffset, name, len, &prop);
if (err)
return err;
memcpy(prop->data, val, len);
return 0;
}
int fdt_delprop(void *fdt, int nodeoffset, const char *name)
{
struct fdt_property *prop;
int len, proplen;
RW_CHECK_HEADER(fdt);
prop = fdt_get_property(fdt, nodeoffset, name, &len);
if (! prop)
return len;
proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE);
return _blob_splice_struct(fdt, prop, proplen, 0);
}
int fdt_add_subnode_namelen(void *fdt, int parentoffset,
const char *name, int namelen)
{
struct fdt_node_header *nh;
int offset, nextoffset;
int nodelen;
int err;
uint32_t tag;
uint32_t *endtag;
RW_CHECK_HEADER(fdt);
offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
if (offset >= 0)
return -FDT_ERR_EXISTS;
else if (offset != -FDT_ERR_NOTFOUND)
return offset;
/* Try to place the new node after the parent's properties */
fdt_next_tag(fdt, parentoffset, &nextoffset, NULL); /* skip the BEGIN_NODE */
do {
offset = nextoffset;
tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
} while (tag == FDT_PROP);
nh = _fdt_offset_ptr(fdt, offset);
nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE;
err = _blob_splice_struct(fdt, nh, 0, nodelen);
if (err)
return err;
nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
memset(nh->name, 0, ALIGN(namelen+1, FDT_TAGSIZE));
memcpy(nh->name, name, namelen);
endtag = (uint32_t *)((void *)nh + nodelen - FDT_TAGSIZE);
*endtag = cpu_to_fdt32(FDT_END_NODE);
return offset;
}
int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
{
return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
}
int fdt_del_node(void *fdt, int nodeoffset)
{
int endoffset;
endoffset = _fdt_node_end_offset(fdt, nodeoffset);
if (endoffset < 0)
return endoffset;
return _blob_splice_struct(fdt, _fdt_offset_ptr(fdt, nodeoffset),
endoffset - nodeoffset, 0);
}
int fdt_open_into(void *fdt, void *buf, int bufsize)
{
int err;
err = fdt_move(fdt, buf, bufsize);
if (err)
return err;
fdt = buf;
fdt_set_header(fdt, totalsize, bufsize);
/* FIXME: re-order if necessary */
err = rw_check_header(fdt);
if (err)
return err;
return 0;
}
int fdt_pack(void *fdt)
{
int err;
err = rw_check_header(fdt);
if (err)
return err;
/* FIXME: pack components */
fdt_set_header(fdt, totalsize, _blob_data_size(fdt));
return 0;
}