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package mirage-xen
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type t = {domid : int;(*foreign domain who is exporting memory
*)ref : Gntref.t;(*id which identifies the specific export in the foreign domain
*)
}A foreign domain must explicitly "grant" us memory and send us the "reference". The pair of (foreign domain id, reference) uniquely identifies the block of memory. This pair ("grant") is transmitted to us out-of-band, usually either via xenstore during device setup or via a shared memory ring structure.
module Local_mapping : sig ... endval map_exn : t -> writable:bool -> Local_mapping.tmap_exn grant ~writable creates a single mapping from grant that will be writable if writable is true.
val map : t -> writable:bool -> (Local_mapping.t, [> `Msg of string ]) resultLike the above but wraps the result in a result type instead of raising an exception.
val mapv_exn : t list -> writable:bool -> Local_mapping.tmapv_exn grants ~writable creates a single contiguous mapping from a list of grants that will be writable if writable is true. Note the grant list can involve grants from multiple domains. If the mapping fails (because at least one grant fails to be mapped), then all grants are unmapped.
val mapv :
t list ->
writable:bool ->
(Local_mapping.t, [> `Msg of string ]) resultLike the above but wraps the result in a result type instead of raising an exception.
val with_mapping :
t ->
writable:bool ->
(Local_mapping.t -> 'a Lwt.t) ->
('a, [> `Msg of string ]) result Lwt.twith_mapping grant ~writable f maps grant, calls f on the result, and then unmaps it. Returns Error _ if the map operation fails.