Mapping Class Reference

Represents one mapping in a mapping tree. More...

#include <mapdb.h>

List of all members.

Public Member Functions
unsigned	space ()
	Address space.
Address	vaddr ()
	Virtual address.
size_t	size ()
	Size of page frame.
Mapping_type	type ()
	Mapping type.
Mapping *	parent ()
	Parent.
Mapping *	next_iter ()
	Next mapping in the mapping tree.
Mapping *	next_child (Mapping *parent)
	Next child mapping of a given parent mapping.
bool	space_is_sigma0 ()
Private Member Functions
	Mapping (const Mapping &)
Mapping_entry _data	__attribute__ ((packed))
	Mapping ()
Mapping_entry *	data ()
bool	unused ()
	free entry?.
bool	is_end_tag ()
Mapping *	next (const Mapping *end_of_tree)
Mapping_tree *	tree ()
	Our Mapping_tree.
Friends
class	Mapdb
class	Mapping_tree
class	Jdb_mapdb
struct	Physframe

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Detailed Description

Represents one mapping in a mapping tree.

Instances of Mapping ("mappings") work as an iterator over a mapping tree. Mapping trees are never visible on the user level. Mappings are looked up directly in the mapping database (class Mapdb) using Mapdb::lookup(). When carrying out such a lookup, the mapping database locks the corresponding mapping tree before returning the mapping. This mapping can the be used to iterate over the tree and to look up other mappings in the tree. The mapping tree is unlocked (and all mappings pointing into it become invalid) when Mapdb::free is called with any one of its mappings.

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Constructor & Destructor Documentation

Mapping::Mapping (  const Mapping &   )  [private]

Mapping::Mapping (   )  [inline, private]

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Member Function Documentation

Mapping_entry _data Mapping::__attribute__ (  (packed)   )  [private]

Mapping_entry * Mapping::data (   )  [inline, private]

bool Mapping::is_end_tag (   )  [inline, private]

Mapping * Mapping::next (  const Mapping *  end_of_tree  )  [inline, private]

Mapping * Mapping::next_child (  Mapping *  parent  )

Next child mapping of a given parent mapping. This function traverses the mapping tree like next_iter(); however, it stops (and returns 0) if the next mapping is ouside the subtree starting with parent. Parameters: parent  Parent mapping Returns: the next child mapping of a given parent mapping

Mapping * Mapping::next_iter (   )

Next mapping in the mapping tree. Returns: the next mapping in the mapping tree. If the mapping has children, it is the first child. Otherwise, if the mapping has a sibling, it's the next sibling. Otherwise, if the mapping is the last sibling or only child, it's the mapping's parent.

Mapping * Mapping::parent (   )

Parent. Returns: parent mapping of this mapping.

size_t Mapping::size (   )  [inline]

Size of page frame. Returns: the size of the page frame -- 4K or 4M.

unsigned Mapping::space (   )  [inline]

Address space. Returns: the address space into which the frame is mapped.

bool Mapping::space_is_sigma0 (   )  [inline]

Mapping_tree * Mapping::tree (   )  [private]

Our Mapping_tree. Returns: the Mapping_tree we are in.

Mapping_type Mapping::type (   )  [inline]

Mapping type. Returns: the type of the mapping -- memory or (Map_mem) I/O flexpage (Map_io).

bool Mapping::unused (   )  [inline, private]

free entry?. Returns: true if this is unused.

Address Mapping::vaddr (   )  [inline]

Virtual address. Returns: the virtual address at which the frame is mapped.

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Friends And Related Function Documentation

friend class Jdb_mapdb [friend]

friend class Mapdb [friend]

friend class Mapping_tree [friend]

friend struct Physframe [friend]

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The documentation for this class was generated from the following files:

• mapdb.h
• mapdb.cc
• mapdb_i.h

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