libfdt/fdt_rw.c - platform/external/u-boot - Gitiles

 /*
  * 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 "config.h"
 #if CONFIG_OF_LIBFDT

 #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, NULL);
 	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, NULL); /* skip the BEGIN_NODE */
 	do {
 		offset = nextoffset;
 		tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
 	} 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;
 }

 #endif /* CONFIG_OF_LIBFDT */
	/*
	* 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 "config.h"
	#if CONFIG_OF_LIBFDT

	#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, NULL);
	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, NULL); /* skip the BEGIN_NODE */
	do {
	offset = nextoffset;
	tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
	} 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;
	}

	#endif /* CONFIG_OF_LIBFDT */