(*
 * Copyright 2014, General Dynamics C4 Systems
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *)

(*
Definition of access rights.
*)

chapter "Access Rights"

theory CapRights_A
imports Main
begin

text \<open>The possible access-control rights that exist in the system.
        Note that some rights are synonyms for others.\<close>
datatype rights = AllowRead | AllowWrite | AllowGrant | AllowGrantReply

definition
  "AllowSend \<equiv> AllowWrite"
definition
  "AllowRecv \<equiv> AllowRead"
definition
  "CanModify \<equiv> AllowWrite"

text \<open>Cap rights are just a set of access rights\<close>
type_synonym cap_rights = "rights set"

text \<open>The set of all rights:\<close>
definition
  all_rights :: cap_rights
where
 "all_rights \<equiv> UNIV"

end