twolevel_slot_alloc.c File Reference

Slot allocator for two level CSpace. More...

Functions
errval_t	two_level_alloc (struct slot_allocator *ca, struct capref *ret)
	slot allocator More...
errval_t	two_level_free (struct slot_allocator *ca, struct capref cap)
	Free an allocated slot. More...
errval_t	two_level_slot_alloc_init_raw (struct multi_slot_allocator *ret, struct capref initial_cap, struct cnoderef initial_cnode, struct capref reserve_cap, struct cnoderef reserve_cnode, void *head_buf, void *reserve_buf, size_t bufsize)
	Initializer that does not allocate any space. More...
errval_t	two_level_slot_alloc_init (struct multi_slot_allocator *ret)
	Initializer that uses memory.

Detailed Description

Slot allocator for two level CSpace.

Function Documentation

errval_t two_level_alloc	(	struct slot_allocator *	ca,
		struct capref *	ret
	)

slot allocator

Parameters

ca	Instance of the allocator
ret	Pointer to return the allocated slot

errval_t two_level_free	(	struct slot_allocator *	ca,
		struct capref	cap
	)

Free an allocated slot.

Parameters

ca	Instance of the allocator
cap	The slot to free

Walks the list of single slot allocators trying to free the slot.

errval_t two_level_slot_alloc_init_raw	(	struct multi_slot_allocator *	ret,
		struct capref	initial_cap,
		struct cnoderef	initial_cnode,
		struct capref	reserve_cap,
		struct cnoderef	reserve_cnode,
		void *	head_buf,
		void *	reserve_buf,
		size_t	bufsize
	)

Initializer that does not allocate any space.

#slot_alloc_init duplicates some of the code below, modify it if making changes here.

XXX: top_buf head_buf and reserve_buf each point to a separate buffer of size bufsize bytes which can be used for backing storage. bufsize evidently needs to be >= sizeof(struct cnode_meta) * nslots / 2. Don't ask me why! -AB