490 lines
14 KiB
C
490 lines
14 KiB
C
/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*
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* libfdt is dual licensed: you can use it either under the terms of
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* the GPL, or the BSD license, at your option.
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*
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* a) This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* Alternatively,
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*
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* b) Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libfdt_env.h"
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#include "fdt.h"
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#include "libfdt.h"
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#include "libfdt_internal.h"
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static int _fdt_blocks_misordered(const void *fdt,
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int mem_rsv_size, int struct_size)
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{
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return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
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|| (fdt_off_dt_struct(fdt) <
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(fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
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|| (fdt_off_dt_strings(fdt) <
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(fdt_off_dt_struct(fdt) + struct_size))
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|| (fdt_totalsize(fdt) <
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(fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
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}
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static int _fdt_rw_check_header(void *fdt)
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{
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FDT_CHECK_HEADER(fdt);
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if (fdt_version(fdt) < 17)
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return -FDT_ERR_BADVERSION;
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if (_fdt_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
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fdt_size_dt_struct(fdt)))
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return -FDT_ERR_BADLAYOUT;
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if (fdt_version(fdt) > 17)
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fdt_set_version(fdt, 17);
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return 0;
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}
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#define FDT_RW_CHECK_HEADER(fdt) \
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{ \
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int __err; \
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if ((__err = _fdt_rw_check_header(fdt)) != 0) \
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return __err; \
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}
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static inline int _fdt_data_size(void *fdt)
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{
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return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
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}
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static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen)
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{
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char *p = splicepoint;
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char *end = (char *)fdt + _fdt_data_size(fdt);
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if (((p + oldlen) < p) || ((p + oldlen) > end))
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return -FDT_ERR_BADOFFSET;
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if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt))
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return -FDT_ERR_BADOFFSET;
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if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
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return -FDT_ERR_NOSPACE;
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memmove(p + newlen, p + oldlen, end - p - oldlen);
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return 0;
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}
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static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
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int oldn, int newn)
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{
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int delta = (newn - oldn) * sizeof(*p);
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int err;
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err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
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if (err)
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return err;
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fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
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fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
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return 0;
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}
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static int _fdt_splice_struct(void *fdt, void *p,
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int oldlen, int newlen)
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{
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int delta = newlen - oldlen;
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int err;
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if ((err = _fdt_splice(fdt, p, oldlen, newlen)))
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return err;
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fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
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fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
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return 0;
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}
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static int _fdt_splice_string(void *fdt, int newlen)
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{
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void *p = (char *)fdt
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+ fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
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int err;
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if ((err = _fdt_splice(fdt, p, 0, newlen)))
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return err;
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fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
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return 0;
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}
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static int _fdt_find_add_string(void *fdt, const char *s)
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{
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char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
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const char *p;
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char *new;
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int len = strlen(s) + 1;
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int err;
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p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
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if (p)
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/* found it */
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return (p - strtab);
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new = strtab + fdt_size_dt_strings(fdt);
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err = _fdt_splice_string(fdt, len);
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if (err)
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return err;
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memcpy(new, s, len);
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return (new - strtab);
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}
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int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
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{
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struct fdt_reserve_entry *re;
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int err;
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FDT_RW_CHECK_HEADER(fdt);
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re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
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err = _fdt_splice_mem_rsv(fdt, re, 0, 1);
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if (err)
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return err;
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re->address = cpu_to_fdt64(address);
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re->size = cpu_to_fdt64(size);
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return 0;
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}
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int fdt_del_mem_rsv(void *fdt, int n)
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{
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struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
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FDT_RW_CHECK_HEADER(fdt);
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if (n >= fdt_num_mem_rsv(fdt))
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return -FDT_ERR_NOTFOUND;
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return _fdt_splice_mem_rsv(fdt, re, 1, 0);
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}
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static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name,
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int len, struct fdt_property **prop)
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{
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int oldlen;
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int err;
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*prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
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if (! (*prop))
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return oldlen;
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if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
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FDT_TAGALIGN(len))))
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return err;
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(*prop)->len = cpu_to_fdt32(len);
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return 0;
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}
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static int _fdt_add_property(void *fdt, int nodeoffset, const char *name,
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int len, struct fdt_property **prop)
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{
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int proplen;
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int nextoffset;
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int namestroff;
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int err;
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if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
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return nextoffset;
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namestroff = _fdt_find_add_string(fdt, name);
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if (namestroff < 0)
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return namestroff;
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*prop = _fdt_offset_ptr_w(fdt, nextoffset);
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proplen = sizeof(**prop) + FDT_TAGALIGN(len);
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err = _fdt_splice_struct(fdt, *prop, 0, proplen);
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if (err)
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return err;
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(*prop)->tag = cpu_to_fdt32(FDT_PROP);
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(*prop)->nameoff = cpu_to_fdt32(namestroff);
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(*prop)->len = cpu_to_fdt32(len);
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return 0;
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}
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int fdt_set_name(void *fdt, int nodeoffset, const char *name)
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{
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char *namep;
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int oldlen, newlen;
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int err;
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FDT_RW_CHECK_HEADER(fdt);
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namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
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if (!namep)
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return oldlen;
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newlen = strlen(name);
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err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1),
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FDT_TAGALIGN(newlen+1));
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if (err)
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return err;
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memcpy(namep, name, newlen+1);
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return 0;
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}
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int fdt_setprop(void *fdt, int nodeoffset, const char *name,
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const void *val, int len)
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{
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struct fdt_property *prop;
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int err;
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FDT_RW_CHECK_HEADER(fdt);
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err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop);
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if (err == -FDT_ERR_NOTFOUND)
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err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
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if (err)
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return err;
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if (len)
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memcpy(prop->data, val, len);
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return 0;
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}
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int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
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const void *val, int len)
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{
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struct fdt_property *prop;
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int err, oldlen, newlen;
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FDT_RW_CHECK_HEADER(fdt);
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prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
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if (prop) {
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newlen = len + oldlen;
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err = _fdt_splice_struct(fdt, prop->data,
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FDT_TAGALIGN(oldlen),
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FDT_TAGALIGN(newlen));
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if (err)
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return err;
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prop->len = cpu_to_fdt32(newlen);
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memcpy(prop->data + oldlen, val, len);
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} else {
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err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
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if (err)
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return err;
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memcpy(prop->data, val, len);
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}
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return 0;
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}
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int fdt_delprop(void *fdt, int nodeoffset, const char *name)
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{
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struct fdt_property *prop;
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int len, proplen;
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FDT_RW_CHECK_HEADER(fdt);
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prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
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if (! prop)
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return len;
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proplen = sizeof(*prop) + FDT_TAGALIGN(len);
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return _fdt_splice_struct(fdt, prop, proplen, 0);
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}
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int fdt_add_subnode_namelen(void *fdt, int parentoffset,
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const char *name, int namelen)
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{
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struct fdt_node_header *nh;
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int offset, nextoffset;
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int nodelen;
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int err;
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uint32_t tag;
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fdt32_t *endtag;
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FDT_RW_CHECK_HEADER(fdt);
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offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
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if (offset >= 0)
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return -FDT_ERR_EXISTS;
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else if (offset != -FDT_ERR_NOTFOUND)
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return offset;
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/* Try to place the new node after the parent's properties */
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fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
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do {
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offset = nextoffset;
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tag = fdt_next_tag(fdt, offset, &nextoffset);
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} while ((tag == FDT_PROP) || (tag == FDT_NOP));
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nh = _fdt_offset_ptr_w(fdt, offset);
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nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
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err = _fdt_splice_struct(fdt, nh, 0, nodelen);
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if (err)
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return err;
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nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
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memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
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memcpy(nh->name, name, namelen);
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endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
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*endtag = cpu_to_fdt32(FDT_END_NODE);
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return offset;
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}
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int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
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{
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return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
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}
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int fdt_del_node(void *fdt, int nodeoffset)
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{
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int endoffset;
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FDT_RW_CHECK_HEADER(fdt);
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endoffset = _fdt_node_end_offset(fdt, nodeoffset);
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if (endoffset < 0)
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return endoffset;
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return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
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endoffset - nodeoffset, 0);
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}
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static void _fdt_packblocks(const char *old, char *new,
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int mem_rsv_size, int struct_size)
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{
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int mem_rsv_off, struct_off, strings_off;
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mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
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struct_off = mem_rsv_off + mem_rsv_size;
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strings_off = struct_off + struct_size;
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memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
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fdt_set_off_mem_rsvmap(new, mem_rsv_off);
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memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
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fdt_set_off_dt_struct(new, struct_off);
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fdt_set_size_dt_struct(new, struct_size);
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memmove(new + strings_off, old + fdt_off_dt_strings(old),
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fdt_size_dt_strings(old));
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fdt_set_off_dt_strings(new, strings_off);
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fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
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}
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int fdt_open_into(const void *fdt, void *buf, int bufsize)
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{
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int err;
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int mem_rsv_size, struct_size;
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int newsize;
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const char *fdtstart = fdt;
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const char *fdtend = fdtstart + fdt_totalsize(fdt);
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char *tmp;
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FDT_CHECK_HEADER(fdt);
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mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
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* sizeof(struct fdt_reserve_entry);
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if (fdt_version(fdt) >= 17) {
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struct_size = fdt_size_dt_struct(fdt);
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} else {
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struct_size = 0;
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while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
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;
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if (struct_size < 0)
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return struct_size;
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}
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if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
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/* no further work necessary */
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err = fdt_move(fdt, buf, bufsize);
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if (err)
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return err;
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fdt_set_version(buf, 17);
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fdt_set_size_dt_struct(buf, struct_size);
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fdt_set_totalsize(buf, bufsize);
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return 0;
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}
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/* Need to reorder */
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newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
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+ struct_size + fdt_size_dt_strings(fdt);
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if (bufsize < newsize)
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return -FDT_ERR_NOSPACE;
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/* First attempt to build converted tree at beginning of buffer */
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tmp = buf;
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/* But if that overlaps with the old tree... */
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if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
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/* Try right after the old tree instead */
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tmp = (char *)(uintptr_t)fdtend;
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if ((tmp + newsize) > ((char *)buf + bufsize))
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return -FDT_ERR_NOSPACE;
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}
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_fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
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memmove(buf, tmp, newsize);
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fdt_set_magic(buf, FDT_MAGIC);
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fdt_set_totalsize(buf, bufsize);
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fdt_set_version(buf, 17);
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fdt_set_last_comp_version(buf, 16);
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fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
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return 0;
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}
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int fdt_pack(void *fdt)
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{
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int mem_rsv_size;
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FDT_RW_CHECK_HEADER(fdt);
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mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
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* sizeof(struct fdt_reserve_entry);
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_fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
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fdt_set_totalsize(fdt, _fdt_data_size(fdt));
|
|
|
|
return 0;
|
|
}
|