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For ages, we've been talking about adding functions to libfdt to allow iteration through properties. So, finally, here are some. I got bogged down on this for a long time because I didn't want to expose offsets directly to properties to the callers. But without that, attempting to make reasonable iteration functions just became horrible. So eventually, I settled on an interface which does now expose property offsets. fdt_first_property_offset() and fdt_next_property_offset() are used to step through the offsets of the properties starting from a particularly node offset. The details of the property at each offset can then be retrieved with either fdt_get_property_by_offset() or fdt_getprop_by_offset() which have interfaces similar to fdt_get_property() and fdt_getprop() respectively. No explicit testcases are included, but we do use the new functions to reimplement the existing fdt_get_property() function. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> This was extracted from the DTC commit: 73dca9ae0b9abe6924ba640164ecce9f8df69c5a Mon Sep 17 00:00:00 2001 Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>
96 lines
3.6 KiB
C
96 lines
3.6 KiB
C
#ifndef _LIBFDT_INTERNAL_H
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#define _LIBFDT_INTERNAL_H
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/*
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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 <fdt.h>
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#define FDT_ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
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#define FDT_TAGALIGN(x) (FDT_ALIGN((x), FDT_TAGSIZE))
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#define FDT_CHECK_HEADER(fdt) \
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{ \
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int err; \
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if ((err = fdt_check_header(fdt)) != 0) \
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return err; \
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}
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int _fdt_check_node_offset(const void *fdt, int offset);
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int _fdt_check_prop_offset(const void *fdt, int offset);
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const char *_fdt_find_string(const char *strtab, int tabsize, const char *s);
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int _fdt_node_end_offset(void *fdt, int nodeoffset);
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static inline const void *_fdt_offset_ptr(const void *fdt, int offset)
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{
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return (const char *)fdt + fdt_off_dt_struct(fdt) + offset;
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}
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static inline void *_fdt_offset_ptr_w(void *fdt, int offset)
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{
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return (void *)(uintptr_t)_fdt_offset_ptr(fdt, offset);
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}
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static inline const struct fdt_reserve_entry *_fdt_mem_rsv(const void *fdt, int n)
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{
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const struct fdt_reserve_entry *rsv_table =
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(const struct fdt_reserve_entry *)
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((const char *)fdt + fdt_off_mem_rsvmap(fdt));
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return rsv_table + n;
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}
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static inline struct fdt_reserve_entry *_fdt_mem_rsv_w(void *fdt, int n)
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{
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return (void *)(uintptr_t)_fdt_mem_rsv(fdt, n);
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}
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#define FDT_SW_MAGIC (~FDT_MAGIC)
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#endif /* _LIBFDT_INTERNAL_H */
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