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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 "config.h"
- #if CONFIG_OF_LIBFDT
- #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;
- }
- #endif /* CONFIG_OF_LIBFDT */
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