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![David Gibson](/assets/img/avatar_default.png)
libfdt is supposed to easy to embed in projects all and sundry. Often, it won't be practical to separate the embedded libfdt's namespace from that of the surrounding project. Which means there can be namespace conflicts between even libfdt's internal/static functions and functions or macros coming from the surrounding project's headers via libfdt_env.h. This patch, therefore, renames a bunch of libfdt internal functions and macros and makes a few other chances to reduce the chances of namespace collisions with embedding projects. Specifically: - Internal functions (even static ones) are now named _fdt_*() - The type and (static) global for the error table in fdt_strerror() gain an fdt_ prefix - The unused macro PALIGN is removed - The memeq and streq macros are removed and open-coded in the users (they were only used once each) - Other macros gain an FDT_ prefix - To save some of the bulk from the previous change, an FDT_TAGALIGN() macro is introduced, where FDT_TAGALIGN(x) == FDT_ALIGN(x, FDT_TAGSIZE) Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
468 lines
12 KiB
C
468 lines
12 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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#ifndef USE_HOSTCC
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#include <fdt.h>
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#include <libfdt.h>
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#else
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#include "fdt_host.h"
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#endif
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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 ((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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int err;
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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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err = _fdt_splice_mem_rsv(fdt, re, 1, 0);
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if (err)
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return err;
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return 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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memcpy(prop->data, val, len);
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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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uint32_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 = (uint32_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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}
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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));
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return 0;
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}
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