libfdt.h

uboot详细解读可用启动引导LINUX2.6内核

 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset,
					   const char *name, uint32_t val)
{
	val = cpu_to_fdt32(val);
	return fdt_setprop_inplace(fdt, nodeoffset, name, &val, sizeof(val));
}

/**
 * fdt_nop_property - replace a property with nop tags
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node whose property to nop
 * @name: name of the property to nop
 *
 * fdt_nop_property() will replace a given property's representation
 * in the blob with FDT_NOP tags, effectively removing it from the
 * tree.
 *
 * This function will alter only the bytes in the blob which contain
 * the property, and will not alter or move any other part of the
 * tree.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOTFOUND, node does not have the named property
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_nop_property(void *fdt, int nodeoffset, const char *name);

/**
 * fdt_nop_node - replace a node (subtree) with nop tags
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node to nop
 *
 * fdt_nop_node() will replace a given node's representation in the
 * blob, including all its subnodes, if any, with FDT_NOP tags,
 * effectively removing it from the tree.
 *
 * This function will alter only the bytes in the blob which contain
 * the node and its properties and subnodes, and will not alter or
 * move any other part of the tree.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_nop_node(void *fdt, int nodeoffset);

/**********************************************************************/
/* Sequential write functions                                         */
/**********************************************************************/

int fdt_create(void *buf, int bufsize);
int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
int fdt_finish_reservemap(void *fdt);
int fdt_begin_node(void *fdt, const char *name);
int fdt_property(void *fdt, const char *name, const void *val, int len);
static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
{
	val = cpu_to_fdt32(val);
	return fdt_property(fdt, name, &val, sizeof(val));
}
#define fdt_property_string(fdt, name, str) \
	fdt_property(fdt, name, str, strlen(str)+1)
int fdt_end_node(void *fdt);
int fdt_finish(void *fdt);

/**********************************************************************/
/* Read-write functions                                               */
/**********************************************************************/

int fdt_open_into(const void *fdt, void *buf, int bufsize);
int fdt_pack(void *fdt);

/**
 * fdt_add_mem_rsv - add one memory reserve map entry
 * @fdt: pointer to the device tree blob
 * @addres, @size: 64-bit values (native endian)
 *
 * Adds a reserve map entry to the given blob reserving a region at
 * address address of length size.
 *
 * This function will insert data into the reserve map and will
 * therfore change the indexes of some entries in the table.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
 *		contain the new reservation entry
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);

/**
 * fdt_del_mem_rsv - remove a memory reserve map entry
 * @fdt: pointer to the device tree blob
 * @n: entry to remove
 *
 * fdt_del_mem_rsv() removes the n-th memory reserve map entry from
 * the blob.
 *
 * This function will delete data from the reservation table and will
 * therfore change the indexes of some entries in the table.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there
 *		are less than n+1 reserve map entries)
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_del_mem_rsv(void *fdt, int n);

/**
 * fdt_set_name - change the name of a given node
 * @fdt: pointer to the device tree blob
 * @nodeoffset: structure block offset of a node
 * @name: name to give the node
 *
 * fdt_set_name() replaces the name (including unit address, if any)
 * of the given node with the given string.  NOTE: this function can't
 * efficiently check if the new name is unique amongst the given
 * node's siblings; results are undefined if this function is invoked
 * with a name equal to one of the given node's siblings.
 *
 * This function may insert or delete data from the blob, and will
 * therefore change the offsets of some existing nodes.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob
 *		to contain the new name
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE, standard meanings
 */
int fdt_set_name(void *fdt, int nodeoffset, const char *name);

/**
 * fdt_setprop - create or change a property
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node whose property to change
 * @name: name of the property to change
 * @val: pointer to data to set the property value to
 * @len: length of the property value
 *
 * fdt_setprop() sets the value of the named property in the given
 * node to the given value and length, creeating the property if it
 * does not already exist.
 *
 * This function may insert or delete data from the blob, and will
 * therefore change the offsets of some existing nodes.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
 *		contain the new property value
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
		const void *val, int len);

/**
 * fdt_setprop_cell - set a property to a single cell value
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node whose property to change
 * @name: name of the property to change
 * @val: 32-bit integer value for the property (native endian)
 *
 * fdt_setprop_cell() sets the value of the named property in the
 * given node to the given cell value (converting to big-endian if
 * necessary), or creates a new property with that value if it does
 * not already exist.
 *
 * This function may insert or delete data from the blob, and will
 * therefore change the offsets of some existing nodes.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
 *		contain the new property value
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
				   uint32_t val)
{
	val = cpu_to_fdt32(val);
	return fdt_setprop(fdt, nodeoffset, name, &val, sizeof(val));
}

/**
 * fdt_setprop_string - set a property to a string value
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node whose property to change
 * @name: name of the property to change
 * @str: string value for the property
 *
 * fdt_setprop_string() sets the value of the named property in the
 * given node to the given string value (using the length of the
 * string to determine the new length of the property), or creates a
 * new property with that value if it does not already exist.
 *
 * This function may insert or delete data from the blob, and will
 * therefore change the offsets of some existing nodes.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
 *		contain the new property value
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
#define fdt_setprop_string(fdt, nodeoffset, name, str) \
	fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)

/**
 * fdt_delprop - delete a property
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node whose property to nop
 * @name: name of the property to nop
 *
 * fdt_del_property() will delete the given property.
 *
 * This function will delete data from the blob, and will therefore
 * change the offsets of some existing nodes.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_NOTFOUND, node does not have the named property
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_delprop(void *fdt, int nodeoffset, const char *name);

/**
 * fdt_add_subnode_namelen - creates a new node based on substring
 * @fdt: pointer to the device tree blob
 * @parentoffset: structure block offset of a node
 * @name: name of the subnode to locate
 * @namelen: number of characters of name to consider
 *
 * Identical to fdt_add_subnode(), but use only the first namelen
 * characters of name as the name of the new node.  This is useful for
 * creating subnodes based on a portion of a larger string, such as a
 * full path.
 */
int fdt_add_subnode_namelen(void *fdt, int parentoffset,
			    const char *name, int namelen);

/**
 * fdt_add_subnode - creates a new node
 * @fdt: pointer to the device tree blob
 * @parentoffset: structure block offset of a node
 * @name: name of the subnode to locate
 *
 * fdt_add_subnode() creates a new node as a subnode of the node at
 * structure block offset parentoffset, with the given name (which
 * should include the unit address, if any).
 *
 * This function will insert data into the blob, and will therefore
 * change the offsets of some existing nodes.

 * returns:
 *	structure block offset of the created nodeequested subnode (>=0), on success
 *	-FDT_ERR_NOTFOUND, if the requested subnode does not exist
 *	-FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
 *	-FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of
 *		the given name
 *	-FDT_ERR_NOSPACE, if there is insufficient free space in the
 *		blob to contain the new node
 *	-FDT_ERR_NOSPACE
 *	-FDT_ERR_BADLAYOUT
 *      -FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_TRUNCATED, standard meanings.
 */
int fdt_add_subnode(void *fdt, int parentoffset, const char *name);

/**
 * fdt_del_node - delete a node (subtree)
 * @fdt: pointer to the device tree blob
 * @nodeoffset: offset of the node to nop
 *
 * fdt_del_node() will remove the given node, including all its
 * subnodes if any, from the blob.
 *
 * This function will delete data from the blob, and will therefore
 * change the offsets of some existing nodes.
 *
 * returns:
 *	0, on success
 *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
 *	-FDT_ERR_BADLAYOUT,
 *	-FDT_ERR_BADMAGIC,
 *	-FDT_ERR_BADVERSION,
 *	-FDT_ERR_BADSTATE,
 *	-FDT_ERR_BADSTRUCTURE,
 *	-FDT_ERR_TRUNCATED, standard meanings
 */
int fdt_del_node(void *fdt, int nodeoffset);

/**********************************************************************/
/* Debugging / informational functions                                */
/**********************************************************************/

const char *fdt_strerror(int errval);

#endif /* _LIBFDT_H */