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301 lines
7.4 KiB
301 lines
7.4 KiB
/* |
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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(struct fdt_header *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(*fdt), 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_OFFSET_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 OFFSET_ERROR(err); \ |
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} |
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static inline int _blob_data_size(struct fdt_header *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(struct fdt_header *fdt, void *p, int oldlen, int newlen) |
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{ |
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void *blob = fdt; |
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void *end = blob + _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) > (blob + 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(struct fdt_header *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->size_dt_struct = cpu_to_fdt32(fdt_size_dt_struct(fdt) + delta); |
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fdt->off_dt_strings = cpu_to_fdt32(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(struct fdt_header *fdt, int newlen) |
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{ |
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void *blob = fdt; |
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void *p = blob + 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->size_dt_strings = cpu_to_fdt32(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(struct fdt_header *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 struct fdt_property *_resize_property(struct fdt_header *fdt, int nodeoffset, |
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const char *name, int len) |
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{ |
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struct fdt_property *prop; |
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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 ((err = fdt_ptr_error(prop))) |
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return PTR_ERROR(err); |
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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 PTR_ERROR(err); |
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prop->len = cpu_to_fdt32(len); |
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return prop; |
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} |
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static struct fdt_property *_add_property(struct fdt_header *fdt, int nodeoffset, |
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const char *name, int len) |
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{ |
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uint32_t tag; |
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struct fdt_property *prop; |
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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); |
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if (tag != FDT_BEGIN_NODE) |
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return PTR_ERROR(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 PTR_ERROR(-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 PTR_ERROR(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 prop; |
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} |
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int fdt_setprop(struct fdt_header *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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prop = _resize_property(fdt, nodeoffset, name, len); |
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err = fdt_ptr_error(prop); |
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if (err == FDT_ERR_NOTFOUND) { |
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prop = _add_property(fdt, nodeoffset, name, len); |
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err = fdt_ptr_error(prop); |
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} |
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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(struct fdt_header *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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int err; |
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RW_OFFSET_CHECK_HEADER(fdt); |
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prop = fdt_get_property(fdt, nodeoffset, name, &len); |
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if ((err = fdt_ptr_error(prop))) |
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return err; |
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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(struct fdt_header *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_OFFSET_CHECK_HEADER(fdt); |
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offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen); |
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if ((err = fdt_offset_error(offset)) == 0) |
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return OFFSET_ERROR(FDT_ERR_EXISTS); |
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else if (err != FDT_ERR_NOTFOUND) |
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return OFFSET_ERROR(err); |
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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); |
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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 OFFSET_ERROR(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(struct fdt_header *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(struct fdt_header *fdt, int nodeoffset) |
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{ |
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int endoffset; |
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int err; |
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endoffset = _fdt_node_end_offset(fdt, nodeoffset); |
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if ((err = fdt_offset_error(endoffset))) |
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return err; |
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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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struct fdt_header *fdt_open_into(struct fdt_header *fdt, void *buf, int bufsize) |
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{ |
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int err; |
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fdt = fdt_move(fdt, buf, bufsize); |
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if ((err = fdt_ptr_error(fdt))) |
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return PTR_ERROR(err); |
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fdt->totalsize = cpu_to_fdt32(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 PTR_ERROR(err); |
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return fdt; |
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} |
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struct fdt_header *fdt_pack(struct fdt_header *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 PTR_ERROR(err); |
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/* FIXME: pack components */ |
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fdt->totalsize = cpu_to_fdt32(_blob_data_size(fdt)); |
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return fdt; |
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}
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