pmap_x86.c File Reference

Pmap code common for x86 archs. More...

Functions
bool	has_vnode (struct vnode *root, uint32_t entry, size_t len, bool only_pages)
	check whether vnode root has children in [entry .. entry+len). More...
struct vnode *	find_vnode (struct vnode *root, uint16_t entry)
	Starting at a given root, return the vnode with entry equal to #entry. More...
bool	inside_region (struct vnode *root, uint32_t entry, uint32_t npages)
void	remove_vnode (struct vnode *root, struct vnode *item)
	remove vnode item from list of children of root.
errval_t	alloc_vnode (struct pmap_x86 *pmap, struct vnode *root, enum objtype type, uint32_t entry, struct vnode **retvnode)
	Allocates a new VNode, adding it to the page table and our metadata. More...
void	remove_empty_vnodes (struct pmap_x86 *pmap, struct vnode *root, uint32_t entry, size_t len)
	remove vnodes with no leafs in [entry .. entry+len), destroy their associated capabilities and free their slabs.
errval_t	pmap_x86_serialise (struct pmap *pmap, void *buf, size_t buflen)
	Serialise vtree to a flat structure, for passing to another process. More...
errval_t	pmap_x86_deserialise (struct pmap *pmap, void *buf, size_t buflen)
	Deserialise vtree from a flat structure, for importing from another process. More...
errval_t	pmap_x86_determine_addr (struct pmap *pmap, struct memobj *memobj, size_t alignment, genvaddr_t *retvaddr)
	Determine a suitable address for a given memory object. More...

Detailed Description

Pmap code common for x86 archs.

Function Documentation

errval_t alloc_vnode	(	struct pmap_x86 *	pmap,
		struct vnode *	root,
		enum objtype	type,
		uint32_t	entry,
		struct vnode **	retvnode
	)

Allocates a new VNode, adding it to the page table and our metadata.

allocate vnode as child of root with type type. Allocates the struct vnode with pmap's slab allocator.

struct vnode* find_vnode	(	struct vnode *	root,
		uint16_t	entry
	)

Starting at a given root, return the vnode with entry equal to #entry.

Returns

vnode at entry in root. NULL if no vnode there.

bool has_vnode	(	struct vnode *	root,
		uint32_t	entry,
		size_t	len,
		bool	only_pages
	)

check whether vnode root has children in [entry .. entry+len).

Returns

* true iff root has children in [entry .. entry+len) and only_pages false

• true iff root has valid page mappings in [entry .. entry+len) and only_pages true

bool inside_region	(	struct vnode *	root,
		uint32_t	entry,
		uint32_t	npages
	)

Returns

true iff [entry..entry+npages) inside a child of root.

errval_t pmap_x86_deserialise	(	struct pmap *	pmap,
		void *	buf,
		size_t	buflen
	)

Deserialise vtree from a flat structure, for importing from another process.

This is used in a newly-spawned child

errval_t pmap_x86_determine_addr	(	struct pmap *	pmap,
		struct memobj *	memobj,
		size_t	alignment,
		genvaddr_t *	retvaddr
	)

Determine a suitable address for a given memory object.

Parameters

pmap	The pmap object
memobj	The memory object to determine the address for
alignment	Minimum alignment
retvaddr	Pointer to return the determined address

Relies on vspace.c code maintaining an ordered list of vregions

errval_t pmap_x86_serialise	(	struct pmap *	pmap,
		void *	buf,
		size_t	buflen
	)

Serialise vtree to a flat structure, for passing to another process.

This is used by spawn_vspace to communicate the vnode capabilities to the child.