This adds the applicable libfdt source files (unmodified) and a README to explain where the source came from.

Signed-off-by: Gerald Van Baren vanbaren@cideas.com --- libfdt/fdt_ro.c | 229 ++++++++++++++++++++++++++++++++++++++++++ libfdt/fdt_rw.c | 293 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ libfdt/fdt_sw.c | 226 +++++++++++++++++++++++++++++++++++++++++ libfdt/fdt_wip.c | 112 +++++++++++++++++++++ 4 files changed, 860 insertions(+), 0 deletions(-)

diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c new file mode 100644 index 0000000..9112c6a --- /dev/null +++ b/libfdt/fdt_ro.c @@ -0,0 +1,229 @@ +/* + * libfdt - Flat Device Tree manipulation + * Copyright (C) 2006 David Gibson, IBM Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "libfdt_env.h" + +#include <fdt.h> +#include <libfdt.h> + +#include "libfdt_internal.h" + +#define CHECK_HEADER(fdt) \ + { \ + int err; \ + if ((err = _fdt_check_header(fdt)) != 0) \ + return err; \ + } + +static int offset_streq(const void *fdt, int offset, + const char *s, int len) +{ + const char *p = fdt_offset_ptr(fdt, offset, len+1); + + if (! p) + /* short match */ + return 0; + + if (memcmp(p, s, len) != 0) + return 0; + + if (p[len] != '\0') + return 0; + + return 1; +} + +char *fdt_string(const void *fdt, int stroffset) +{ + return (char *)fdt + fdt_off_dt_strings(fdt) + stroffset; +} + +int fdt_subnode_offset_namelen(const void *fdt, int parentoffset, + const char *name, int namelen) +{ + int level = 0; + uint32_t tag; + int offset, nextoffset; + + CHECK_HEADER(fdt); + + tag = _fdt_next_tag(fdt, parentoffset, &nextoffset); + if (tag != FDT_BEGIN_NODE) + return -FDT_ERR_BADOFFSET; + + do { + offset = nextoffset; + tag = _fdt_next_tag(fdt, offset, &nextoffset); + + switch (tag) { + case FDT_END: + return -FDT_ERR_TRUNCATED; + + case FDT_BEGIN_NODE: + level++; + if (level != 1) + continue; + if (offset_streq(fdt, offset+FDT_TAGSIZE, name, namelen)) + /* Found it! */ + return offset; + break; + + case FDT_END_NODE: + level--; + break; + + case FDT_PROP: + case FDT_NOP: + break; + + default: + return -FDT_ERR_BADSTRUCTURE; + } + } while (level >= 0); + + return -FDT_ERR_NOTFOUND; +} + +int fdt_subnode_offset(const void *fdt, int parentoffset, + const char *name) +{ + return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name)); +} + +int fdt_path_offset(const void *fdt, const char *path) +{ + const char *end = path + strlen(path); + const char *p = path; + int offset = 0; + + CHECK_HEADER(fdt); + + if (*path != '/') + return -FDT_ERR_BADPATH; + + while (*p) { + const char *q; + + while (*p == '/') + p++; + if (! *p) + return -FDT_ERR_BADPATH; + q = strchr(p, '/'); + if (! q) + q = end; + + offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p); + if (offset < 0) + return offset; + + p = q; + } + + return offset; +} + +struct fdt_property *fdt_get_property(const void *fdt, + int nodeoffset, + const char *name, int *lenp) +{ + int level = 0; + uint32_t tag; + struct fdt_property *prop; + int namestroff; + int offset, nextoffset; + int err; + + if ((err = _fdt_check_header(fdt)) != 0) + goto fail; + + err = -FDT_ERR_BADOFFSET; + if (nodeoffset % FDT_TAGSIZE) + goto fail; + + tag = _fdt_next_tag(fdt, nodeoffset, &nextoffset); + if (tag != FDT_BEGIN_NODE) + goto fail; + + do { + offset = nextoffset; + + tag = _fdt_next_tag(fdt, offset, &nextoffset); + switch (tag) { + case FDT_END: + err = -FDT_ERR_TRUNCATED; + goto fail; + + case FDT_BEGIN_NODE: + level++; + break; + + case FDT_END_NODE: + level--; + break; + + case FDT_PROP: + if (level != 0) + continue; + + err = -FDT_ERR_BADSTRUCTURE; + prop = fdt_offset_ptr_typed(fdt, offset, prop); + if (! prop) + goto fail; + namestroff = fdt32_to_cpu(prop->nameoff); + if (streq(fdt_string(fdt, namestroff), name)) { + /* Found it! */ + int len = fdt32_to_cpu(prop->len); + prop = fdt_offset_ptr(fdt, offset, + sizeof(*prop)+len); + if (! prop) + goto fail; + + if (lenp) + *lenp = len; + + return prop; + } + break; + + case FDT_NOP: + break; + + default: + err = -FDT_ERR_BADSTRUCTURE; + goto fail; + } + } while (level >= 0); + + err = -FDT_ERR_NOTFOUND; + fail: + if (lenp) + *lenp = err; + return NULL; +} + +void *fdt_getprop(const void *fdt, int nodeoffset, + const char *name, int *lenp) +{ + const struct fdt_property *prop; + + prop = fdt_get_property(fdt, nodeoffset, name, lenp); + if (! prop) + return NULL; + + return prop->data; +} diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c new file mode 100644 index 0000000..7396645 --- /dev/null +++ b/libfdt/fdt_rw.c @@ -0,0 +1,293 @@ +/* + * libfdt - Flat Device Tree manipulation + * Copyright (C) 2006 David Gibson, IBM Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "libfdt_env.h" + +#include <fdt.h> +#include <libfdt.h> + +#include "libfdt_internal.h" + +static int rw_check_header(void *fdt) +{ + int err; + + if ((err = _fdt_check_header(fdt))) + return err; + if (fdt_version(fdt) < 0x11) + return -FDT_ERR_BADVERSION; + if (fdt_off_mem_rsvmap(fdt) < ALIGN(sizeof(struct fdt_header), 8)) + return -FDT_ERR_BADLAYOUT; + if (fdt_off_dt_struct(fdt) < + (fdt_off_mem_rsvmap(fdt) + sizeof(struct fdt_reserve_entry))) + return -FDT_ERR_BADLAYOUT; + if (fdt_off_dt_strings(fdt) < + (fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt))) + return -FDT_ERR_BADLAYOUT; + if (fdt_totalsize(fdt) < + (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt))) + return -FDT_ERR_BADLAYOUT; + return 0; +} + +#define RW_CHECK_HEADER(fdt) \ + { \ + int err; \ + if ((err = rw_check_header(fdt)) != 0) \ + return err; \ + } + +static inline int _blob_data_size(void *fdt) +{ + return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); +} + +static int _blob_splice(void *fdt, void *p, int oldlen, int newlen) +{ + void *end = fdt + _blob_data_size(fdt); + + if (((p + oldlen) < p) || ((p + oldlen) > end)) + return -FDT_ERR_BADOFFSET; + if ((end - oldlen + newlen) > (fdt + fdt_totalsize(fdt))) + return -FDT_ERR_NOSPACE; + memmove(p + newlen, p + oldlen, end - p - oldlen); + return 0; +} + +static int _blob_splice_struct(void *fdt, void *p, + int oldlen, int newlen) +{ + int delta = newlen - oldlen; + int err; + + if ((err = _blob_splice(fdt, p, oldlen, newlen))) + return err; + + fdt_set_header(fdt, size_dt_struct, fdt_size_dt_struct(fdt) + delta); + fdt_set_header(fdt, off_dt_strings, fdt_off_dt_strings(fdt) + delta); + return 0; +} + +static int _blob_splice_string(void *fdt, int newlen) +{ + void *p = fdt + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt); + int err; + + if ((err = _blob_splice(fdt, p, 0, newlen))) + return err; + + fdt_set_header(fdt, size_dt_strings, fdt_size_dt_strings(fdt) + newlen); + return 0; +} + +static int _find_add_string(void *fdt, const char *s) +{ + char *strtab = (char *)fdt + fdt_off_dt_strings(fdt); + const char *p; + char *new; + int len = strlen(s) + 1; + int err; + + p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s); + if (p) + /* found it */ + return (p - strtab); + + new = strtab + fdt_size_dt_strings(fdt); + err = _blob_splice_string(fdt, len); + if (err) + return err; + + memcpy(new, s, len); + return (new - strtab); +} + +static int _resize_property(void *fdt, int nodeoffset, const char *name, int len, + struct fdt_property **prop) +{ + int oldlen; + int err; + + *prop = fdt_get_property(fdt, nodeoffset, name, &oldlen); + if (! (*prop)) + return oldlen; + + if ((err = _blob_splice_struct(fdt, (*prop)->data, + ALIGN(oldlen, FDT_TAGSIZE), + ALIGN(len, FDT_TAGSIZE)))) + return err; + + (*prop)->len = cpu_to_fdt32(len); + return 0; +} + +static int _add_property(void *fdt, int nodeoffset, const char *name, int len, + struct fdt_property **prop) +{ + uint32_t tag; + int proplen; + int nextoffset; + int namestroff; + int err; + + tag = _fdt_next_tag(fdt, nodeoffset, &nextoffset); + if (tag != FDT_BEGIN_NODE) + return -FDT_ERR_BADOFFSET; + + namestroff = _find_add_string(fdt, name); + if (namestroff < 0) + return namestroff; + + *prop = _fdt_offset_ptr(fdt, nextoffset); + proplen = sizeof(**prop) + ALIGN(len, FDT_TAGSIZE); + + err = _blob_splice_struct(fdt, *prop, 0, proplen); + if (err) + return err; + + (*prop)->tag = cpu_to_fdt32(FDT_PROP); + (*prop)->nameoff = cpu_to_fdt32(namestroff); + (*prop)->len = cpu_to_fdt32(len); + return 0; +} + +int fdt_setprop(void *fdt, int nodeoffset, const char *name, + const void *val, int len) +{ + struct fdt_property *prop; + int err; + + if ((err = rw_check_header(fdt))) + return err; + + err = _resize_property(fdt, nodeoffset, name, len, &prop); + if (err == -FDT_ERR_NOTFOUND) + err = _add_property(fdt, nodeoffset, name, len, &prop); + if (err) + return err; + + memcpy(prop->data, val, len); + return 0; +} + +int fdt_delprop(void *fdt, int nodeoffset, const char *name) +{ + struct fdt_property *prop; + int len, proplen; + + RW_CHECK_HEADER(fdt); + + prop = fdt_get_property(fdt, nodeoffset, name, &len); + if (! prop) + return len; + + proplen = sizeof(*prop) + ALIGN(len, FDT_TAGSIZE); + return _blob_splice_struct(fdt, prop, proplen, 0); +} + +int fdt_add_subnode_namelen(void *fdt, int parentoffset, + const char *name, int namelen) +{ + struct fdt_node_header *nh; + int offset, nextoffset; + int nodelen; + int err; + uint32_t tag; + uint32_t *endtag; + + RW_CHECK_HEADER(fdt); + + offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen); + if (offset >= 0) + return -FDT_ERR_EXISTS; + else if (offset != -FDT_ERR_NOTFOUND) + return offset; + + /* Try to place the new node after the parent's properties */ + _fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */ + do { + offset = nextoffset; + tag = _fdt_next_tag(fdt, offset, &nextoffset); + } while (tag == FDT_PROP); + + nh = _fdt_offset_ptr(fdt, offset); + nodelen = sizeof(*nh) + ALIGN(namelen+1, FDT_TAGSIZE) + FDT_TAGSIZE; + + err = _blob_splice_struct(fdt, nh, 0, nodelen); + if (err) + return err; + + nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); + memset(nh->name, 0, ALIGN(namelen+1, FDT_TAGSIZE)); + memcpy(nh->name, name, namelen); + endtag = (uint32_t *)((void *)nh + nodelen - FDT_TAGSIZE); + *endtag = cpu_to_fdt32(FDT_END_NODE); + + return offset; +} + +int fdt_add_subnode(void *fdt, int parentoffset, const char *name) +{ + return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name)); +} + +int fdt_del_node(void *fdt, int nodeoffset) +{ + int endoffset; + + endoffset = _fdt_node_end_offset(fdt, nodeoffset); + if (endoffset < 0) + return endoffset; + + return _blob_splice_struct(fdt, _fdt_offset_ptr(fdt, nodeoffset), + endoffset - nodeoffset, 0); +} + +int fdt_open_into(void *fdt, void *buf, int bufsize) +{ + int err; + + err = fdt_move(fdt, buf, bufsize); + if (err) + return err; + + fdt = buf; + + fdt_set_header(fdt, totalsize, bufsize); + + /* FIXME: re-order if necessary */ + + err = rw_check_header(fdt); + if (err) + return err; + + return 0; +} + +int fdt_pack(void *fdt) +{ + int err; + + err = rw_check_header(fdt); + if (err) + return err; + + /* FIXME: pack components */ + fdt_set_header(fdt, totalsize, _blob_data_size(fdt)); + return 0; +} diff --git a/libfdt/fdt_sw.c b/libfdt/fdt_sw.c new file mode 100644 index 0000000..41d4891 --- /dev/null +++ b/libfdt/fdt_sw.c @@ -0,0 +1,226 @@ +/* + * libfdt - Flat Device Tree manipulation + * Copyright (C) 2006 David Gibson, IBM Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "libfdt_env.h" + +#include <fdt.h> +#include <libfdt.h> + +#include "libfdt_internal.h" + +static int check_header_sw(void *fdt) +{ + if (fdt_magic(fdt) != SW_MAGIC) + return -FDT_ERR_BADMAGIC; + return 0; +} + +static void *grab_space(void *fdt, int len) +{ + int offset = fdt_size_dt_struct(fdt); + int spaceleft; + + spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt) + - fdt_size_dt_strings(fdt); + + if ((offset + len < offset) || (offset + len > spaceleft)) + return NULL; + + fdt_set_header(fdt, size_dt_struct, offset + len); + return fdt_offset_ptr(fdt, offset, len); +} + +int fdt_create(void *buf, int bufsize) +{ + void *fdt = buf; + + if (bufsize < sizeof(struct fdt_header)) + return -FDT_ERR_NOSPACE; + + memset(buf, 0, bufsize); + + fdt_set_header(fdt, magic, SW_MAGIC); + fdt_set_header(fdt, version, FDT_LAST_SUPPORTED_VERSION); + fdt_set_header(fdt, last_comp_version, FDT_FIRST_SUPPORTED_VERSION); + fdt_set_header(fdt, totalsize, bufsize); + + fdt_set_header(fdt, off_mem_rsvmap, ALIGN(sizeof(struct fdt_header), + sizeof(struct fdt_reserve_entry))); + fdt_set_header(fdt, off_dt_struct, fdt_off_mem_rsvmap(fdt)); + fdt_set_header(fdt, off_dt_strings, bufsize); + + return 0; +} + +int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size) +{ + struct fdt_reserve_entry *re; + int err = check_header_sw(fdt); + int offset; + + if (err) + return err; + if (fdt_size_dt_struct(fdt)) + return -FDT_ERR_BADSTATE; + + offset = fdt_off_dt_struct(fdt); + if ((offset + sizeof(*re)) > fdt_totalsize(fdt)) + return -FDT_ERR_NOSPACE; + + re = (struct fdt_reserve_entry *)((void *)fdt + offset); + re->address = cpu_to_fdt64(addr); + re->size = cpu_to_fdt64(size); + + fdt_set_header(fdt, off_dt_struct, offset + sizeof(*re)); + + return 0; +} + +int fdt_finish_reservemap(void *fdt) +{ + return fdt_add_reservemap_entry(fdt, 0, 0); +} + +int fdt_begin_node(void *fdt, const char *name) +{ + struct fdt_node_header *nh; + int err = check_header_sw(fdt); + int namelen = strlen(name) + 1; + + if (err) + return err; + + nh = grab_space(fdt, sizeof(*nh) + ALIGN(namelen, FDT_TAGSIZE)); + if (! nh) + return -FDT_ERR_NOSPACE; + + nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE); + memcpy(nh->name, name, namelen); + return 0; +} + +int fdt_end_node(void *fdt) +{ + uint32_t *en; + int err = check_header_sw(fdt); + + if (err) + return err; + + en = grab_space(fdt, FDT_TAGSIZE); + if (! en) + return -FDT_ERR_NOSPACE; + + *en = cpu_to_fdt32(FDT_END_NODE); + return 0; +} + +static int find_add_string(void *fdt, const char *s) +{ + char *strtab = (char *)fdt + fdt_totalsize(fdt); + const char *p; + int strtabsize = fdt_size_dt_strings(fdt); + int len = strlen(s) + 1; + int struct_top, offset; + + p = _fdt_find_string(strtab - strtabsize, strtabsize, s); + if (p) + return p - strtab; + + /* Add it */ + offset = -strtabsize - len; + struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt); + if (fdt_totalsize(fdt) + offset < struct_top) + return 0; /* no more room :( */ + + memcpy(strtab + offset, s, len); + fdt_set_header(fdt, size_dt_strings, strtabsize + len); + return offset; +} + +int fdt_property(void *fdt, const char *name, const void *val, int len) +{ + struct fdt_property *prop; + int err = check_header_sw(fdt); + int nameoff; + + if (err) + return err; + + nameoff = find_add_string(fdt, name); + if (nameoff == 0) + return -FDT_ERR_NOSPACE; + + prop = grab_space(fdt, sizeof(*prop) + ALIGN(len, FDT_TAGSIZE)); + if (! prop) + return -FDT_ERR_NOSPACE; + + prop->tag = cpu_to_fdt32(FDT_PROP); + prop->nameoff = cpu_to_fdt32(nameoff); + prop->len = cpu_to_fdt32(len); + memcpy(prop->data, val, len); + return 0; +} + +int fdt_finish(void *fdt) +{ + int err = check_header_sw(fdt); + char *p = (char *)fdt; + uint32_t *end; + int oldstroffset, newstroffset; + uint32_t tag; + int offset, nextoffset; + + if (err) + return err; + + /* Add terminator */ + end = grab_space(fdt, sizeof(*end)); + if (! end) + return -FDT_ERR_NOSPACE; + *end = cpu_to_fdt32(FDT_END); + + /* Relocate the string table */ + oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt); + newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt); + memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt)); + fdt_set_header(fdt, off_dt_strings, newstroffset); + + /* Walk the structure, correcting string offsets */ + offset = 0; + while ((tag = _fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) { + if (tag == FDT_PROP) { + struct fdt_property *prop = fdt_offset_ptr(fdt, offset, + sizeof(*prop)); + int nameoff; + + if (! prop) + return -FDT_ERR_BADSTRUCTURE; + + nameoff = fdt32_to_cpu(prop->nameoff); + nameoff += fdt_size_dt_strings(fdt); + prop->nameoff = cpu_to_fdt32(nameoff); + } + offset = nextoffset; + } + + /* Finally, adjust the header */ + fdt_set_header(fdt, totalsize, newstroffset + fdt_size_dt_strings(fdt)); + fdt_set_header(fdt, magic, FDT_MAGIC); + return 0; +} diff --git a/libfdt/fdt_wip.c b/libfdt/fdt_wip.c new file mode 100644 index 0000000..0db7d25 --- /dev/null +++ b/libfdt/fdt_wip.c @@ -0,0 +1,112 @@ +/* + * libfdt - Flat Device Tree manipulation + * Copyright (C) 2006 David Gibson, IBM Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "libfdt_env.h" + +#include <fdt.h> +#include <libfdt.h> + +#include "libfdt_internal.h" + +int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name, + const void *val, int len) +{ + void *propval; + int proplen; + + propval = fdt_getprop(fdt, nodeoffset, name, &proplen); + if (! propval) + return proplen; + + if (proplen != len) + return -FDT_ERR_NOSPACE; + + memcpy(propval, val, len); + return 0; +} + +static void nop_region(void *start, int len) +{ + uint32_t *p; + + for (p = start; (void *)p < (start + len); p++) + *p = cpu_to_fdt32(FDT_NOP); +} + +int fdt_nop_property(void *fdt, int nodeoffset, const char *name) +{ + struct fdt_property *prop; + int len; + + prop = fdt_get_property(fdt, nodeoffset, name, &len); + if (! prop) + return len; + + nop_region(prop, len + sizeof(*prop)); + + return 0; +} + +int _fdt_node_end_offset(void *fdt, int nodeoffset) +{ + int level = 0; + uint32_t tag; + int offset, nextoffset; + + tag = _fdt_next_tag(fdt, nodeoffset, &nextoffset); + if (tag != FDT_BEGIN_NODE) + return -FDT_ERR_BADOFFSET; + do { + offset = nextoffset; + tag = _fdt_next_tag(fdt, offset, &nextoffset); + + switch (tag) { + case FDT_END: + return offset; + + case FDT_BEGIN_NODE: + level++; + break; + + case FDT_END_NODE: + level--; + break; + + case FDT_PROP: + case FDT_NOP: + break; + + default: + return -FDT_ERR_BADSTRUCTURE; + } + } while (level >= 0); + + return nextoffset; +} + +int fdt_nop_node(void *fdt, int nodeoffset) +{ + int endoffset; + + endoffset = _fdt_node_end_offset(fdt, nodeoffset); + if (endoffset < 0) + return endoffset; + + nop_region(fdt_offset_ptr(fdt, nodeoffset, 0), endoffset - nodeoffset); + return 0; +}