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Virtual address allocator

include/mem/vaddr_alloc.h

struct `vas_range`

Member Type	Member Name
`struct vas_range`	`*next_free`
`struct rbt_node`	`node`
`vaddr_t`	`start`
`size_t`	`length`

struct `vas_space`

Member Type	Member Name
`struct spinlock`	`lock`
`struct rbt`	`tree`
`vaddr_t`	`base`
`vaddr_t`	`limit`
`struct vas_range`	`*freelist`
`struct vas_set`	`*percpu_sets`

struct vas_space *vas_space_init(vaddr_t base,vaddr_t limit)
void vas_free(struct vas_space *vas,vaddr_t addr)
vaddr_tvas_alloc(struct vas_space *vas,size_t size,size_t align)
struct vas_space *vas_space_bootstrap(vaddr_t base,vaddr_t limit)
void vasrange_free(struct vas_space *space,struct vas_range *r)
struct vas_range *vasrange_alloc(struct vas_space *space)
struct vas_space *vas_space_bootstrap_internal(vaddr_t base,vaddr_t limit)
struct vas_space *vas_space_init_internal(vaddr_t base,vaddr_t limit)