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https://github.com/brain-hackers/u-boot-brain
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![Robert P. J. Day](/assets/img/avatar_default.png)
A number of style fixes across the files in this directory, including: * Correct invalid kernel-doc content. * Tidy up massive comment in fdt_region.c. * Use correct spelling of "U-Boot". * Replace tests of "! <var>" with "!<var>". * Replace "libfdt_env.h" with <libfdt_env.h>. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Acked-by: Simon Glass <sjg@chromium.org>
210 lines
4.2 KiB
C
210 lines
4.2 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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* SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause
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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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int fdt_check_header(const void *fdt)
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{
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if (fdt_magic(fdt) == FDT_MAGIC) {
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/* Complete tree */
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if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
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return -FDT_ERR_BADVERSION;
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if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
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return -FDT_ERR_BADVERSION;
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} else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
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/* Unfinished sequential-write blob */
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if (fdt_size_dt_struct(fdt) == 0)
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return -FDT_ERR_BADSTATE;
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} else {
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return -FDT_ERR_BADMAGIC;
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}
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return 0;
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}
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const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
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{
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const char *p;
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if (fdt_version(fdt) >= 0x11)
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if (((offset + len) < offset)
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|| ((offset + len) > fdt_size_dt_struct(fdt)))
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return NULL;
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p = _fdt_offset_ptr(fdt, offset);
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if (p + len < p)
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return NULL;
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return p;
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}
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uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
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{
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const fdt32_t *tagp, *lenp;
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uint32_t tag;
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int offset = startoffset;
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const char *p;
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*nextoffset = -FDT_ERR_TRUNCATED;
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tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
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if (!tagp)
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return FDT_END; /* premature end */
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tag = fdt32_to_cpu(*tagp);
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offset += FDT_TAGSIZE;
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*nextoffset = -FDT_ERR_BADSTRUCTURE;
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switch (tag) {
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case FDT_BEGIN_NODE:
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/* skip name */
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do {
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p = fdt_offset_ptr(fdt, offset++, 1);
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} while (p && (*p != '\0'));
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if (!p)
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return FDT_END; /* premature end */
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break;
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case FDT_PROP:
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lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
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if (!lenp)
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return FDT_END; /* premature end */
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/* skip-name offset, length and value */
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offset += sizeof(struct fdt_property) - FDT_TAGSIZE
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+ fdt32_to_cpu(*lenp);
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break;
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case FDT_END:
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case FDT_END_NODE:
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case FDT_NOP:
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break;
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default:
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return FDT_END;
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}
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if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
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return FDT_END; /* premature end */
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*nextoffset = FDT_TAGALIGN(offset);
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return tag;
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}
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int _fdt_check_node_offset(const void *fdt, int offset)
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{
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if ((offset < 0) || (offset % FDT_TAGSIZE)
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|| (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
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return -FDT_ERR_BADOFFSET;
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return offset;
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}
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int _fdt_check_prop_offset(const void *fdt, int offset)
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{
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if ((offset < 0) || (offset % FDT_TAGSIZE)
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|| (fdt_next_tag(fdt, offset, &offset) != FDT_PROP))
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return -FDT_ERR_BADOFFSET;
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return offset;
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}
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int fdt_next_node(const void *fdt, int offset, int *depth)
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{
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int nextoffset = 0;
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uint32_t tag;
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if (offset >= 0)
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if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
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return nextoffset;
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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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switch (tag) {
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case FDT_PROP:
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case FDT_NOP:
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break;
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case FDT_BEGIN_NODE:
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if (depth)
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(*depth)++;
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break;
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case FDT_END_NODE:
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if (depth && ((--(*depth)) < 0))
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return nextoffset;
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break;
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case FDT_END:
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if ((nextoffset >= 0)
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|| ((nextoffset == -FDT_ERR_TRUNCATED) && !depth))
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return -FDT_ERR_NOTFOUND;
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else
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return nextoffset;
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}
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} while (tag != FDT_BEGIN_NODE);
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return offset;
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}
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int fdt_first_subnode(const void *fdt, int offset)
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{
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int depth = 0;
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offset = fdt_next_node(fdt, offset, &depth);
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if (offset < 0 || depth != 1)
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return -FDT_ERR_NOTFOUND;
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return offset;
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}
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int fdt_next_subnode(const void *fdt, int offset)
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{
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int depth = 1;
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/*
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* With respect to the parent, the depth of the next subnode will be
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* the same as the last.
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*/
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do {
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offset = fdt_next_node(fdt, offset, &depth);
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if (offset < 0 || depth < 1)
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return -FDT_ERR_NOTFOUND;
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} while (depth > 1);
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return offset;
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}
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const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
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{
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int len = strlen(s) + 1;
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const char *last = strtab + tabsize - len;
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const char *p;
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for (p = strtab; p <= last; p++)
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if (memcmp(p, s, len) == 0)
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return p;
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return NULL;
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}
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int fdt_move(const void *fdt, void *buf, int bufsize)
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{
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FDT_CHECK_HEADER(fdt);
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if (fdt_totalsize(fdt) > bufsize)
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return -FDT_ERR_NOSPACE;
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memmove(buf, fdt, fdt_totalsize(fdt));
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return 0;
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}
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