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![Gerald Van Baren](/assets/img/avatar_default.png)
Changed _fdt_check_header() to fdt_check_header() and made it part of the interface - it is a useful routine. Also did some asthetics cleanup to the include files (headers).
294 lines
6.9 KiB
C
294 lines
6.9 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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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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 rw_check_header(void *fdt)
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{
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int err;
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if ((err = fdt_check_header(fdt)))
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return err;
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if (fdt_version(fdt) < 0x11)
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return -FDT_ERR_BADVERSION;
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if (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8))
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return -FDT_ERR_BADLAYOUT;
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if (fdt_off_dt_struct(fdt) <
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(fdt_off_mem_rsvmap(fdt) + sizeof(struct fdt_reserve_entry)))
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return -FDT_ERR_BADLAYOUT;
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if (fdt_off_dt_strings(fdt) <
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(fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt)))
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return -FDT_ERR_BADLAYOUT;
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if (fdt_totalsize(fdt) <
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(fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)))
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return -FDT_ERR_BADLAYOUT;
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return 0;
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}
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#define RW_CHECK_HEADER(fdt) \
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{ \
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int err; \
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if ((err = rw_check_header(fdt)) != 0) \
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return err; \
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}
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static inline int _blob_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 _blob_splice(void *fdt, void *p, int oldlen, int newlen)
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{
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void *end = fdt + _blob_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) > (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 _blob_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 = _blob_splice(fdt, p, oldlen, newlen)))
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return err;
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fdt_set_header(fdt, size_dt_struct, fdt_size_dt_struct(fdt) + delta);
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fdt_set_header(fdt, off_dt_strings, fdt_off_dt_strings(fdt) + delta);
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return 0;
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}
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static int _blob_splice_string(void *fdt, int newlen)
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{
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void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
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int err;
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if ((err = _blob_splice(fdt, p, 0, newlen)))
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return err;
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fdt_set_header(fdt, size_dt_strings, fdt_size_dt_strings(fdt) + newlen);
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return 0;
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}
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static int _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 = _blob_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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static int _resize_property(void *fdt, int nodeoffset, const char *name, int len,
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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(fdt, nodeoffset, name, &oldlen);
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if (! (*prop))
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return oldlen;
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if ((err = _blob_splice_struct(fdt, (*prop)->data,
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ALIGN(oldlen, FDT_TAGSIZE),
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ALIGN(len, FDT_TAGSIZE))))
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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 _add_property(void *fdt, int nodeoffset, const char *name, int len,
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struct fdt_property **prop)
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{
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uint32_t tag;
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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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tag = fdt_next_tag(fdt, nodeoffset, &nextoffset, NULL);
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if (tag != FDT_BEGIN_NODE)
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return -FDT_ERR_BADOFFSET;
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namestroff = _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(fdt, nextoffset);
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proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE);
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err = _blob_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_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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if ((err = rw_check_header(fdt)))
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return err;
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err = _resize_property(fdt, nodeoffset, name, len, &prop);
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if (err == -FDT_ERR_NOTFOUND)
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err = _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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RW_CHECK_HEADER(fdt);
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prop = fdt_get_property(fdt, nodeoffset, name, &len);
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if (! prop)
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return len;
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proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE);
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return _blob_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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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, NULL); /* 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, NULL);
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} while (tag == FDT_PROP);
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nh = _fdt_offset_ptr(fdt, offset);
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nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE;
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err = _blob_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, ALIGN(namelen+1, FDT_TAGSIZE));
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memcpy(nh->name, name, namelen);
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endtag = (uint32_t *)((void *)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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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 _blob_splice_struct(fdt, _fdt_offset_ptr(fdt, nodeoffset),
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endoffset - nodeoffset, 0);
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}
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int fdt_open_into(void *fdt, void *buf, int bufsize)
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{
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int err;
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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 = buf;
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fdt_set_header(fdt, totalsize, bufsize);
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/* FIXME: re-order if necessary */
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err = rw_check_header(fdt);
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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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int fdt_pack(void *fdt)
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{
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int err;
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err = rw_check_header(fdt);
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if (err)
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return err;
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/* FIXME: pack components */
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fdt_set_header(fdt, totalsize, _blob_data_size(fdt));
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return 0;
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}
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