(*
 * Copyright 2014, General Dynamics C4 Systems
 *
 * This software may be distributed and modified according to the terms of
 * the GNU General Public License version 2. Note that NO WARRANTY is provided.
 * See "LICENSE_GPLv2.txt" for details.
 *
 * @TAG(GD_GPL)
 *)

theory ArchArch_AI
imports "../Arch_AI"
begin

context Arch begin global_naming ARM

definition
  "valid_aci aci \<equiv> case aci of MakePool frame slot parent base \<Rightarrow>
  \<lambda>s. cte_wp_at (\<lambda>c. c = cap.NullCap) slot s \<and> real_cte_at slot s \<and>
  ex_cte_cap_wp_to is_cnode_cap slot s \<and>
  slot \<noteq> parent \<and>
  cte_wp_at (\<lambda>cap. \<exists>idx. cap = cap.UntypedCap False frame pageBits idx ) parent s \<and>
  descendants_of parent (cdt s) = {} \<and>
  is_aligned base asid_low_bits \<and> base \<le> 2^asid_bits - 1 \<and>
  arm_asid_table (arch_state s) (asid_high_bits_of base) = None"


lemma safe_parent_strg:
  "cte_wp_at (\<lambda>cap. cap = UntypedCap False frame pageBits idx) p s \<and>
   descendants_of p (cdt s) = {} \<and>
   valid_objs s
  \<longrightarrow>
  cte_wp_at (safe_parent_for (cdt s) p
             (ArchObjectCap (ASIDPoolCap frame base)))
             p s"
  apply (clarsimp simp: cte_wp_at_caps_of_state safe_parent_for_def is_physical_def arch_is_physical_def)
  apply (rule is_aligned_no_overflow)
  apply (drule (1) caps_of_state_valid_cap)
  apply (clarsimp simp: valid_cap_def cap_aligned_def)
  done


(* 32-bit instance of Detype_AI.range_cover_full *)
lemma range_cover_full:
  "\<lbrakk>is_aligned ptr sz;sz<word_bits\<rbrakk> \<Longrightarrow> range_cover (ptr::word32) sz sz (Suc 0)"
   by (clarsimp simp:range_cover_def unat_eq_0 le_mask_iff[symmetric] word_and_le1 word_bits_def)


definition
  valid_arch_inv :: "arch_invocation \<Rightarrow> 'z::state_ext state \<Rightarrow> bool"
where
  "valid_arch_inv ai \<equiv> case ai of
     InvokePageTable pti \<Rightarrow>
       valid_pti pti
   | InvokePageDirectory pdi \<Rightarrow>
       valid_pdi pdi
   | InvokePage pgi \<Rightarrow>
       valid_page_inv pgi
   | InvokeASIDControl aci \<Rightarrow>
       valid_aci aci
   | InvokeASIDPool ap \<Rightarrow>
       valid_apinv ap"


lemma check_vp_wpR [wp]:
  "\<lbrace>\<lambda>s. vmsz_aligned w sz \<longrightarrow> P () s\<rbrace>
  check_vp_alignment sz w \<lbrace>P\<rbrace>, -"
  apply (simp add: check_vp_alignment_def unlessE_whenE cong: vmpage_size.case_cong)
  apply (rule hoare_pre)
   apply (wp hoare_whenE_wp|wpc)+
  apply (simp add: vmsz_aligned_def)
  done


lemma check_vp_inv: "\<lbrace>P\<rbrace> check_vp_alignment sz w \<lbrace>\<lambda>_. P\<rbrace>"
  apply (simp add: check_vp_alignment_def unlessE_whenE cong: vmpage_size.case_cong)
  apply (rule hoare_pre)
   apply (wp hoare_whenE_wp|wpc)+
  apply simp
  done


lemma p2_low_bits_max:
  "(2 ^ asid_low_bits - 1) = (max_word :: 10 word)"
  by (simp add: asid_low_bits_def max_word_def)


lemma dom_ucast_eq:
  "(- dom (\<lambda>a::asid_low_index. p (ucast a::machine_word)) \<inter> {x. ucast x + y \<noteq> 0} = {}) =
   (- dom p \<inter> {x. x \<le> 2 ^ asid_low_bits - 1 \<and> x + y \<noteq> 0} = {})"
  apply safe
   apply clarsimp
   apply (rule ccontr)
   apply (erule_tac x="ucast x" in in_emptyE)
   apply (clarsimp simp: p2_low_bits_max)
   apply (rule conjI)
    apply (clarsimp simp: ucast_ucast_mask)
    apply (subst (asm) less_mask_eq)
    apply (rule word_less_sub_le [THEN iffD1])
      apply (simp add: word_bits_def)
     apply (simp add: asid_low_bits_def)
    apply simp
   apply (clarsimp simp: ucast_ucast_mask)
   apply (subst (asm) less_mask_eq)
   apply (rule word_less_sub_le [THEN iffD1])
     apply (simp add: word_bits_def)
    apply (simp add: asid_low_bits_def)
   apply simp
  apply (clarsimp simp: p2_low_bits_max)
  apply (rule ccontr)
  apply simp
  apply (erule_tac x="ucast x" in in_emptyE)
  apply clarsimp
  apply (rule conjI, blast)
  apply (rule word_less_sub_1)
  apply (rule order_less_le_trans)
  apply (rule ucast_less, simp)
  apply (simp add: asid_low_bits_def)
  done

lemma asid_high_bits_max_word:
  "(2 ^ asid_high_bits - 1 :: 7 word) = max_word"
  by (simp add: asid_high_bits_def max_word_def)

lemma dom_ucast_eq_7:
  "(- dom (\<lambda>a::7 (*asid_high_bits*) word. p (ucast a::word32)) \<inter> {x. x \<le> 2 ^ asid_high_bits - 1} = {}) =
   (- dom p \<inter> {x. x \<le> 2 ^ asid_high_bits - 1} = {})"
  apply safe
   apply clarsimp
   apply (rule ccontr)
   apply (erule_tac x="ucast x" in in_emptyE)
   apply (clarsimp simp: asid_high_bits_max_word)
   apply (clarsimp simp: ucast_ucast_mask)
   apply (subst (asm) less_mask_eq)
   apply (rule word_less_sub_le [THEN iffD1])
     apply (simp add: word_bits_def)
    apply (simp add: asid_high_bits_def)
   apply simp
  apply (clarsimp simp: asid_high_bits_max_word)
  apply (rule ccontr)
  apply simp
  apply (erule_tac x="ucast x" in in_emptyE)
  apply clarsimp
  apply (rule conjI, blast)
  apply (rule word_less_sub_1)
  apply (rule order_less_le_trans)
  apply (rule ucast_less, simp)
  apply (simp add: asid_high_bits_def)
  done



lemma ucast_fst_hd_assocs:
  "- dom (\<lambda>x. pool (ucast (x::asid_low_index)::machine_word)) \<inter> {x. ucast x + (w::machine_word) \<noteq> 0} \<noteq> {}
  \<Longrightarrow>
  fst (hd [(x, y)\<leftarrow>assocs pool . x \<le> 2 ^ asid_low_bits - 1 \<and> x + w \<noteq> 0 \<and> y = None]) =
  ucast (fst (hd [(x, y)\<leftarrow>assocs (\<lambda>a::asid_low_index. pool (ucast a)) .
                          x \<le> 2 ^ asid_low_bits - 1 \<and>
                          ucast x + w \<noteq> 0 \<and> y = None]))"
  apply (simp add: ucast_assocs[unfolded o_def])
  apply (simp add: filter_map split_def)
  apply (simp cong: conj_cong add: ucast_ucast_len)
  apply (simp add: asid_low_bits_def minus_one_norm)
  apply (simp add: ord_le_eq_trans [OF word_n1_ge])
  apply (simp add: word_le_make_less)
  apply (subgoal_tac "P" for P)  (* cut_tac but more awesome *)
   apply (subst hd_map, assumption)
   apply simp
   apply (rule sym, rule ucast_ucast_len)
   apply (drule hd_in_set)
   apply simp
  apply (simp add: assocs_empty_dom_comp null_def split_def)
  apply (simp add: ucast_assocs[unfolded o_def] filter_map split_def)
  apply (simp cong: conj_cong add: ucast_ucast_len)
  done


crunch typ_at [wp]: perform_page_table_invocation, perform_page_invocation,
         perform_asid_pool_invocation, perform_page_directory_invocation "\<lambda>s. P (typ_at T p s)"
  (wp: crunch_wps)


lemmas perform_page_table_invocation_typ_ats [wp] =
  abs_typ_at_lifts [OF perform_page_table_invocation_typ_at]

lemmas perform_page_directory_invocation_typ_ats [wp] =
  abs_typ_at_lifts [OF perform_page_directory_invocation_typ_at]

lemmas perform_page_invocation_typ_ats [wp] =
  abs_typ_at_lifts [OF perform_page_invocation_typ_at]

lemmas perform_asid_pool_invocation_typ_ats [wp] =
  abs_typ_at_lifts [OF perform_asid_pool_invocation_typ_at]


lemma perform_asid_control_invocation_tcb_at:
  "\<lbrace>invs and valid_aci aci and st_tcb_at active p and
    K (\<forall>w a b c. aci = asid_control_invocation.MakePool w a b c \<longrightarrow> w \<noteq> p)\<rbrace>
  perform_asid_control_invocation aci
  \<lbrace>\<lambda>rv. tcb_at p\<rbrace>"
  apply (simp add: perform_asid_control_invocation_def)
  apply (cases aci)
  apply clarsimp
  apply (wp |simp)+
    apply (wp obj_at_delete_objects retype_region_obj_at_other2  hoare_vcg_const_imp_lift|assumption)+
  apply (intro impI conjI)
    apply (clarsimp simp: retype_addrs_def obj_bits_api_def default_arch_object_def image_def ptr_add_def)
   apply (clarsimp simp: st_tcb_at_tcb_at)+
  apply (frule st_tcb_ex_cap)
    apply fastforce
   apply (clarsimp split: Structures_A.thread_state.splits)
   apply auto[1]
  apply (clarsimp simp: ex_nonz_cap_to_def valid_aci_def)
  apply (frule invs_untyped_children)
  apply (clarsimp simp:cte_wp_at_caps_of_state)
  apply (erule_tac ptr="(aa,ba)" in untyped_children_in_mdbE[where P="\<lambda>c. t \<in> zobj_refs c" for t])
      apply (simp add: cte_wp_at_caps_of_state)
     apply simp
    apply (simp add:cte_wp_at_caps_of_state)
    apply fastforce
   apply (clarsimp simp: zobj_refs_to_obj_refs)
   apply (erule(1) in_empty_interE)
    apply (clarsimp simp:page_bits_def)
  apply simp
  done


lemma ucast_asid_high_btis_of_le [simp]:
  "ucast (asid_high_bits_of w) \<le> (2 ^ asid_high_bits - 1 :: word32)"
  apply (simp add: asid_high_bits_of_def)
  apply (rule word_less_sub_1)
  apply (rule order_less_le_trans)
  apply (rule ucast_less)
   apply simp
  apply (simp add: asid_high_bits_def)
  done


lemma invoke_arch_tcb:
  "\<lbrace>invs and valid_arch_inv ai and st_tcb_at active tptr\<rbrace>
  arch_perform_invocation ai
  \<lbrace>\<lambda>rv. tcb_at tptr\<rbrace>"
  apply (simp add: arch_perform_invocation_def)
  apply (cases ai, simp_all)
     apply (wp, clarsimp simp: st_tcb_at_tcb_at)+
   defer
   apply (wp, clarsimp simp: st_tcb_at_tcb_at)
  apply (wp perform_asid_control_invocation_tcb_at)
  apply (clarsimp simp add: valid_arch_inv_def)
  apply (clarsimp simp: valid_aci_def)
  apply (frule st_tcb_ex_cap)
    apply fastforce
   apply (clarsimp split: Structures_A.thread_state.splits)
   apply auto[1]
  apply (clarsimp simp: ex_nonz_cap_to_def)
  apply (frule invs_untyped_children)
  apply (clarsimp simp:cte_wp_at_caps_of_state)
  apply (erule_tac ptr="(aa,ba)" in untyped_children_in_mdbE[where P="\<lambda>c. t \<in> zobj_refs c" for t])
      apply (simp add: cte_wp_at_caps_of_state)+
     apply fastforce
   apply (clarsimp simp: zobj_refs_to_obj_refs cte_wp_at_caps_of_state)
   apply (drule_tac p="(aa,ba)" in caps_of_state_valid_cap, fastforce)
   apply (clarsimp simp: valid_cap_def cap_aligned_def)
   apply (drule_tac x=tptr in base_member_set, simp)
    apply (simp add: pageBits_def field_simps del: atLeastAtMost_iff)
   apply (metis (no_types) orthD1 x_power_minus_1)
  apply simp
  done

end


locale asid_update = Arch +
  fixes ap asid s s'
  assumes ko: "ko_at (ArchObj (ASIDPool Map.empty)) ap s"
  assumes empty: "arm_asid_table (arch_state s) asid = None"
  defines "s' \<equiv> s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid \<mapsto> ap)\<rparr>\<rparr>"
begin

lemma vs_lookup1' [simp]:
  "vs_lookup1 s' = vs_lookup1 s"
  by (simp add: vs_lookup1_def s'_def)


lemma vs_lookup_pages1' [simp]:
  "vs_lookup_pages1 s' = vs_lookup_pages1 s"
  by (simp add: vs_lookup_pages1_def s'_def)


lemma vs_asid_refs' [simp]:
  "vs_asid_refs (arm_asid_table (arch_state s')) =
  vs_asid_refs (arm_asid_table (arch_state s)) \<union> {([VSRef (ucast asid) None], ap)}"
  apply (simp add: s'_def)
  apply (rule set_eqI)
  apply (rule iffI)
   apply (auto simp: vs_asid_refs_def split: if_split_asm)[1]
  apply clarsimp
  apply (erule disjE)
   apply (auto simp: vs_asid_refs_def)[1]
  apply (subst (asm) vs_asid_refs_def)
  apply (clarsimp dest!: graph_ofD)
  apply (rule vs_asid_refsI)
  apply (clarsimp simp: empty)
  done


lemma vs_lookup':
  "vs_lookup s' = vs_lookup s \<union> {([VSRef (ucast asid) None], ap)}"
  using ko
  apply (simp add: vs_lookup_def)
  apply (rule rtrancl_insert)
  apply (clarsimp simp: vs_lookup1_def obj_at_def vs_refs_def)
  done


lemma vs_lookup_pages':
  "vs_lookup_pages s' = vs_lookup_pages s \<union> {([VSRef (ucast asid) None], ap)}"
  using ko
  apply (simp add: vs_lookup_pages_def)
  apply (rule rtrancl_insert)
  apply (clarsimp simp: vs_lookup_pages1_def obj_at_def vs_refs_pages_def)
  done


lemma obj_at [simp]:
  "obj_at P p s' = obj_at P p s"
  by (simp add: s'_def)

lemma vs_lookup_neq: "\<lbrakk>(rs \<rhd> p) s' ; p \<noteq> ap\<rbrakk> \<Longrightarrow>  (rs \<rhd> p) s"
   by (clarsimp simp: vs_lookup')

lemma vspace_objs':
  "valid_vspace_objs s \<Longrightarrow> valid_vspace_objs s'"
  using ko
  apply (clarsimp simp: valid_vspace_objs_def)
  apply (erule_tac x=p in allE)
  apply (case_tac "p = ap";
         case_tac ao;
         fastforce simp: obj_at_def s'_def
                   intro: vs_lookup_neq)
  done

lemma global_objs':
  "valid_global_objs s \<Longrightarrow> valid_global_objs s'"
  apply (clarsimp simp: valid_global_objs_def valid_ao_at_def second_level_tables_def)
  apply (auto simp: s'_def)
  done


lemma caps_of_state_s':
  "caps_of_state s' = caps_of_state s"
  by (rule caps_of_state_pspace, simp add: s'_def)


lemma valid_vs_lookup':
  "\<lbrakk> valid_vs_lookup s;
     \<exists>ptr cap. caps_of_state s ptr = Some cap
     \<and> ap \<in> obj_refs cap \<and> vs_cap_ref cap = Some [VSRef (ucast asid) None] \<rbrakk>
  \<Longrightarrow> valid_vs_lookup s'"
  by (clarsimp simp: valid_vs_lookup_def caps_of_state_s' vs_lookup_pages')


lemma valid_table_caps':
  "\<lbrakk> valid_table_caps s \<rbrakk>
        \<Longrightarrow> valid_table_caps s'"
  apply (simp add: valid_table_caps_def caps_of_state_s' second_level_tables_def)
  apply (simp add: s'_def)
  done


lemma valid_arch_caps:
  "\<lbrakk> valid_arch_caps s;
     \<exists>ptr cap. caps_of_state s ptr = Some cap
     \<and> ap \<in> obj_refs cap \<and> vs_cap_ref cap = Some [VSRef (ucast asid) None] \<rbrakk>
  \<Longrightarrow> valid_arch_caps s'"
  by (simp add: valid_arch_caps_def caps_of_state_s'
                valid_table_caps' valid_vs_lookup')


lemma valid_asid_map':
  "valid_asid_map s \<Longrightarrow> valid_asid_map s'"
  using empty
  apply (clarsimp simp: valid_asid_map_def s'_def)
  apply (drule bspec, blast)
  apply (clarsimp simp: vspace_at_asid_def)
  apply (drule vs_lookup_2ConsD)
  apply clarsimp
  apply (erule vs_lookup_atE)
  apply (drule vs_lookup1D)
  apply clarsimp
  apply (rule vs_lookupI[rotated])
   apply (rule r_into_rtrancl)
   apply (rule vs_lookup1I)
     apply (fastforce simp: obj_at_def)
    apply assumption
   apply simp
  apply (clarsimp simp: vs_asid_refs_def graph_of_def)
  apply fastforce
  done

end


context Arch begin global_naming ARM

lemma valid_arch_state_strg:
  "valid_arch_state s \<and> ap \<notin> ran (arm_asid_table (arch_state s)) \<and> asid_pool_at ap s \<longrightarrow>
   valid_arch_state (s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid \<mapsto> ap)\<rparr>\<rparr>)"
  apply (clarsimp simp: valid_arch_state_def)
  apply (clarsimp simp: valid_asid_table_def ran_def)
  apply (fastforce intro!: inj_on_fun_updI)
  done


lemma valid_vs_lookup_at_upd_strg:
  "valid_vs_lookup s \<and>
   ko_at (ArchObj (ASIDPool Map.empty)) ap s \<and>
   arm_asid_table (arch_state s) asid = None \<and>
   (\<exists>ptr cap. caps_of_state s ptr = Some cap \<and> ap \<in> obj_refs cap \<and>
              vs_cap_ref cap = Some [VSRef (ucast asid) None])
   \<longrightarrow>
   valid_vs_lookup (s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid \<mapsto> ap)\<rparr>\<rparr>)"
  apply clarsimp
  apply (subgoal_tac "asid_update ap asid s")
   prefer 2
   apply unfold_locales[1]
    apply assumption+
  apply (erule (1) asid_update.valid_vs_lookup')
  apply fastforce
  done


lemma retype_region_ap:
  "\<lbrace>\<top>\<rbrace>
  retype_region ap 1 0 (ArchObject ASIDPoolObj) dev
  \<lbrace>\<lambda>_. ko_at (ArchObj (ASIDPool Map.empty)) ap\<rbrace>"
  apply (rule hoare_post_imp)
   prefer 2
   apply (rule retype_region_obj_at)
    apply simp
   apply simp
  apply (clarsimp simp: retype_addrs_def obj_bits_api_def default_arch_object_def)
  apply (clarsimp simp: obj_at_def default_object_def default_arch_object_def)
  done


lemma retype_region_ap':
  "\<lbrace>\<top>\<rbrace> retype_region ap 1 0 (ArchObject ASIDPoolObj) dev \<lbrace>\<lambda>rv. asid_pool_at ap\<rbrace>"
  apply (rule hoare_strengthen_post, rule retype_region_ap)
  apply (clarsimp simp: a_type_def elim!: obj_at_weakenE)
  done


lemma no_cap_to_obj_with_diff_ref_null_filter:
  "no_cap_to_obj_with_diff_ref cap S
     = (\<lambda>s. \<forall>c \<in> ran (null_filter (caps_of_state s) |` (- S)).
             obj_refs c = obj_refs cap
                 \<longrightarrow> table_cap_ref c = table_cap_ref cap)"
  apply (simp add: no_cap_to_obj_with_diff_ref_def
                   ball_ran_eq cte_wp_at_caps_of_state)
  apply (simp add: Ball_def)
  apply (intro iff_allI ext)
  apply (simp add: restrict_map_def null_filter_def)
  apply (auto dest!: obj_ref_none_no_asid[rule_format]
               simp: table_cap_ref_def)
  done


lemma retype_region_no_cap_to_obj:
  "\<lbrace>valid_pspace and valid_mdb
             and caps_overlap_reserved {ptr..ptr + 2 ^ obj_bits_api ty us - 1}
             and caps_no_overlap ptr sz
             and pspace_no_overlap_range_cover ptr sz
             and no_cap_to_obj_with_diff_ref cap S
             and (\<lambda>s. \<exists>slot. cte_wp_at (\<lambda>c. up_aligned_area ptr sz \<subseteq> cap_range c \<and> cap_is_device c = dev) slot s)
             and K (ty = Structures_A.CapTableObject \<longrightarrow> 0 < us)
             and K (range_cover ptr sz (obj_bits_api ty us) 1) \<rbrace>
     retype_region ptr 1 us ty dev
   \<lbrace>\<lambda>rv. no_cap_to_obj_with_diff_ref cap S\<rbrace>"
  apply (rule hoare_gen_asm)+
  apply (simp add: no_cap_to_obj_with_diff_ref_null_filter)
  apply (wp retype_region_caps_of | simp)+
  apply fastforce
  done


lemma valid_table_caps_asid_upd [iff]:
  "valid_table_caps (s\<lparr>arch_state := (arm_asid_table_update f (arch_state s))\<rparr>) =
   valid_table_caps s"
  by (simp add: valid_table_caps_def second_level_tables_def)


lemma vs_asid_ref_upd:
  "([VSRef (ucast (asid_high_bits_of asid')) None] \<rhd> ap')
    (s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid_high_bits_of asid \<mapsto> ap)\<rparr>\<rparr>)
  = (if asid_high_bits_of asid' = asid_high_bits_of asid
    then ap' = ap
    else ([VSRef (ucast (asid_high_bits_of asid')) None] \<rhd> ap') s)"
  by (fastforce intro: vs_lookup_atI elim: vs_lookup_atE)


lemma vs_asid_ref_eq:
  "([VSRef (ucast asid) None] \<rhd> ap) s
  = (arm_asid_table (arch_state s) asid = Some ap)"
  by (fastforce elim: vs_lookup_atE intro: vs_lookup_atI)


lemma set_cap_reachable_pg_cap:
  "\<lbrace>\<lambda>s. P (reachable_pg_cap cap s)\<rbrace> set_cap x y \<lbrace>\<lambda>_ s. P (reachable_pg_cap cap s)\<rbrace>"
  by (unfold reachable_pg_cap_def, wp hoare_vcg_ex_lift set_cap.vs_lookup_pages)


lemma cap_insert_simple_arch_caps_ap:
  "\<lbrace>valid_arch_caps and (\<lambda>s. cte_wp_at (safe_parent_for (cdt s) src cap) src s)
     and no_cap_to_obj_with_diff_ref cap {dest}
     and (\<lambda>s. arm_asid_table (arch_state s) (asid_high_bits_of asid) = None)
     and ko_at (ArchObj (ASIDPool Map.empty)) ap
     and K (cap = ArchObjectCap (ASIDPoolCap ap asid)) \<rbrace>
     cap_insert cap src dest
   \<lbrace>\<lambda>rv s. valid_arch_caps (s\<lparr>arch_state := arch_state s
                       \<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid_high_bits_of asid \<mapsto> ap)\<rparr>\<rparr>)\<rbrace>"
  apply (simp add: cap_insert_def update_cdt_def set_cdt_def valid_arch_caps_def
    set_untyped_cap_as_full_def bind_assoc)
  apply (strengthen valid_vs_lookup_at_upd_strg)
  apply (wp get_cap_wp set_cap_valid_vs_lookup set_cap_arch_obj
            set_cap_valid_table_caps hoare_vcg_all_lift
          | simp split del: if_split)+
       apply (rule_tac P = "cte_wp_at ((=) src_cap) src" in set_cap_orth)
       apply (wp hoare_vcg_imp_lift hoare_vcg_ball_lift set_free_index_final_cap
                 hoare_vcg_disj_lift set_cap_reachable_pg_cap set_cap.vs_lookup_pages
              | clarsimp)+
      apply (wp set_cap_arch_obj set_cap_valid_table_caps hoare_vcg_ball_lift
                get_cap_wp static_imp_wp)+
  apply (clarsimp simp: cte_wp_at_caps_of_state is_cap_simps)
  apply (rule conjI)
   apply (clarsimp simp: vs_cap_ref_def)
   apply (rule_tac x="fst dest" in exI)
   apply (rule_tac x="snd dest" in exI)
   apply simp
  apply (rule conjI)
   apply (simp add: unique_table_caps_def is_cap_simps)
  apply (subst unique_table_refs_def)
  apply (intro allI impI)
  apply (simp split: if_split_asm)
    apply (simp add: no_cap_to_obj_with_diff_ref_def cte_wp_at_caps_of_state)
   apply (simp add: no_cap_to_obj_with_diff_ref_def cte_wp_at_caps_of_state)
  apply (erule (3) unique_table_refsD)
  done

lemma valid_asid_map_asid_upd_strg:
  "valid_asid_map s \<and>
   ko_at (ArchObj (ASIDPool Map.empty)) ap s \<and>
   arm_asid_table (arch_state s) asid = None \<longrightarrow>
   valid_asid_map (s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid \<mapsto> ap)\<rparr>\<rparr>)"
  apply clarsimp
  apply (subgoal_tac "asid_update ap asid s")
   prefer 2
   apply unfold_locales[1]
    apply assumption+
  apply (erule (1) asid_update.valid_asid_map')
  done

lemma valid_vspace_objs_asid_upd_strg:
  "valid_vspace_objs s \<and>
   ko_at (ArchObj (ASIDPool Map.empty)) ap s \<and>
   arm_asid_table (arch_state s) asid = None \<longrightarrow>
   valid_vspace_objs (s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid \<mapsto> ap)\<rparr>\<rparr>)"
  apply clarsimp
  apply (subgoal_tac "asid_update ap asid s")
   prefer 2
   apply unfold_locales[1]
    apply assumption+
  apply (erule (1) asid_update.vspace_objs')
  done

lemma valid_global_objs_asid_upd_strg:
  "valid_global_objs s \<and>
   ko_at (ArchObj (arch_kernel_obj.ASIDPool Map.empty)) ap s \<and>
   arm_asid_table (arch_state s) asid = None \<longrightarrow>
   valid_global_objs (s\<lparr>arch_state := arch_state s\<lparr>arm_asid_table := arm_asid_table (arch_state s)(asid \<mapsto> ap)\<rparr>\<rparr>)"
  by clarsimp


lemma safe_parent_cap_is_device:
  "safe_parent_for m p cap pcap \<Longrightarrow> cap_is_device cap = cap_is_device pcap"
  by (simp add: safe_parent_for_def)

lemma cap_insert_ap_invs:
  "\<lbrace>invs and valid_cap cap and tcb_cap_valid cap dest and
    ex_cte_cap_wp_to (appropriate_cte_cap cap) dest and
    cte_wp_at (\<lambda>c. c = cap.NullCap) dest and
    no_cap_to_obj_with_diff_ref cap {dest} and
    (\<lambda>s. cte_wp_at (safe_parent_for (cdt s) src cap) src s) and
    K (cap = cap.ArchObjectCap (arch_cap.ASIDPoolCap ap asid)) and
   (\<lambda>s. \<forall>irq \<in> cap_irqs cap. irq_issued irq s) and
   ko_at (ArchObj (arch_kernel_obj.ASIDPool Map.empty)) ap and
   (\<lambda>s. ap \<notin> ran (arm_asid_table (arch_state s)) \<and>
        arm_asid_table (arch_state s) (asid_high_bits_of asid) = None)\<rbrace>
  cap_insert cap src dest
  \<lbrace>\<lambda>rv s. invs (s\<lparr>arch_state := arch_state s
                       \<lparr>arm_asid_table := (arm_asid_table \<circ> arch_state) s(asid_high_bits_of asid \<mapsto> ap)\<rparr>\<rparr>)\<rbrace>"
  apply (simp add: invs_def valid_state_def valid_pspace_def)
  apply (strengthen valid_arch_state_strg
                    valid_asid_map_asid_upd_strg valid_vspace_objs_asid_upd_strg )
  apply (simp cong: conj_cong)
  apply (rule hoare_pre)
   apply (wp cap_insert_simple_mdb cap_insert_iflive
             cap_insert_zombies cap_insert_ifunsafe cap_insert_vspace_objs
             cap_insert_valid_global_refs cap_insert_idle
             valid_irq_node_typ cap_insert_simple_arch_caps_ap)
  apply (clarsimp simp: is_simple_cap_def cte_wp_at_caps_of_state is_cap_simps)
  apply (frule safe_parent_cap_is_device)
  apply (drule safe_parent_cap_range)
  apply (simp add: cap_range_def)
  apply (rule conjI)
   prefer 2
   apply (clarsimp simp: obj_at_def a_type_def)
  apply (clarsimp simp: cte_wp_at_caps_of_state)
  apply (drule_tac p="(a,b)" in caps_of_state_valid_cap, fastforce)
  apply (auto simp: obj_at_def is_tcb_def is_cap_table_def
                    valid_cap_def [where c="cap.Zombie a b x" for a b x]
              dest: obj_ref_is_tcb obj_ref_is_cap_table split: option.splits)
  done


lemma max_index_upd_no_cap_to:
  "\<lbrace>\<lambda>s. no_cap_to_obj_with_diff_ref cap {slot} s \<and>
        cte_wp_at ((=) ucap) cref s \<and> is_untyped_cap ucap\<rbrace>
   set_cap (max_free_index_update ucap) cref
   \<lbrace>\<lambda>rv s. no_cap_to_obj_with_diff_ref cap {slot} s \<rbrace>"
  apply (clarsimp simp:no_cap_to_obj_with_diff_ref_def)
  apply (wp hoare_vcg_ball_lift set_cap_cte_wp_at_neg)
  apply (clarsimp simp:cte_wp_at_caps_of_state free_index_update_def is_cap_simps)
  apply (drule_tac x = cref in bspec)
   apply clarsimp
  apply (clarsimp simp:table_cap_ref_def)
  done


lemma perform_asid_control_invocation_st_tcb_at:
  "\<lbrace>st_tcb_at (P and (Not \<circ> inactive) and (Not \<circ> idle)) t
    and ct_active and invs and valid_aci aci\<rbrace>
    perform_asid_control_invocation aci
  \<lbrace>\<lambda>y. st_tcb_at P t\<rbrace>"
  including no_pre
  supply
    is_aligned_neg_mask_eq[simp del]
    is_aligned_neg_mask_weaken[simp del]
  apply (clarsimp simp: perform_asid_control_invocation_def split: asid_control_invocation.splits)
  apply (rename_tac word1 a b aa ba word2)
  apply (wp hoare_vcg_const_imp_lift retype_region_st_tcb_at set_cap_no_overlap|simp)+
    apply (strengthen invs_valid_objs invs_psp_aligned)
    apply (clarsimp simp:conj_comms)
    apply (wp max_index_upd_invs_simple get_cap_wp)+
  apply (rule hoare_name_pre_state)
  apply (subgoal_tac "is_aligned word1 page_bits")
   prefer 2
   apply (clarsimp simp: valid_aci_def cte_wp_at_caps_of_state)
   apply (drule(1) caps_of_state_valid[rotated])+
   apply (simp add:valid_cap_simps cap_aligned_def page_bits_def)
  apply (subst delete_objects_rewrite)
     apply (simp add:page_bits_def word_bits_def pageBits_def word_size_bits_def)+
   apply (simp add:is_aligned_neg_mask_eq)
  apply (rule hoare_pre, wp)
  apply (clarsimp simp: valid_aci_def)
  apply (frule intvl_range_conv)
   apply (simp add:word_bits_def page_bits_def pageBits_def)
  apply (clarsimp simp:detype_clear_um_independent page_bits_def is_aligned_neg_mask_eq)
  apply (rule conjI)
  apply (clarsimp simp:cte_wp_at_caps_of_state)
   apply (rule pspace_no_overlap_detype)
     apply (rule caps_of_state_valid_cap)
      apply (simp add:page_bits_def)+
    apply (simp add:invs_valid_objs invs_psp_aligned)+
  apply (rule conjI)
   apply (erule pred_tcb_weakenE, simp)
  apply (rule conjI)
   apply (frule st_tcb_ex_cap)
     apply clarsimp
    apply (clarsimp split: Structures_A.thread_state.splits)
   apply (clarsimp simp: ex_nonz_cap_to_def)
   apply (frule invs_untyped_children)
   apply (clarsimp simp:cte_wp_at_caps_of_state)
   apply (erule_tac ptr="(aa,ba)" in untyped_children_in_mdbE[where P="\<lambda>c. t \<in> zobj_refs c" for t])
       apply (simp add: cte_wp_at_caps_of_state)+
      apply fastforce
    apply (clarsimp simp: zobj_refs_to_obj_refs)
    apply (fastforce simp:page_bits_def)
   apply simp
  apply (clarsimp simp:obj_bits_api_def arch_kobj_size_def cte_wp_at_caps_of_state
    default_arch_object_def empty_descendants_range_in)
  apply (frule_tac cap = "(cap.UntypedCap False word1 pageBits idx)"
    in detype_invariants[rotated 3],clarsimp+)
    apply (simp add:cte_wp_at_caps_of_state
      empty_descendants_range_in descendants_range_def2)+
  apply (thin_tac "x = Some cap.NullCap" for x)+
  apply (drule(1) caps_of_state_valid_cap[OF _ invs_valid_objs])
  apply (intro conjI)
    apply (clarsimp simp:valid_cap_def cap_aligned_def range_cover_full
     invs_psp_aligned invs_valid_objs page_bits_def)
   apply (erule pspace_no_overlap_detype)
  apply (auto simp:page_bits_def detype_clear_um_independent)
  done

lemma set_cap_idx_up_aligned_area:
  "\<lbrace>K (\<exists>idx. pcap = UntypedCap dev ptr pageBits idx) and cte_wp_at ((=) pcap) slot
      and valid_objs\<rbrace> set_cap (max_free_index_update pcap) slot
  \<lbrace>\<lambda>rv s. (\<exists>slot. cte_wp_at (\<lambda>c. up_aligned_area ptr pageBits \<subseteq> cap_range c \<and> cap_is_device c = dev) slot s)\<rbrace>"
  apply (rule hoare_pre)
  apply (wp hoare_vcg_ex_lift set_cap_cte_wp_at)
  apply (rule_tac x = slot in exI)
  apply clarsimp
  apply (frule(1) cte_wp_valid_cap)
  apply (clarsimp simp: cte_wp_at_caps_of_state is_aligned_neg_mask_eq
                        p_assoc_help valid_cap_def valid_untyped_def cap_aligned_def)
  done

primrec(nonexhaustive)  get_untyped_cap_idx :: "cap \<Rightarrow> nat"
where "get_untyped_cap_idx (UntypedCap dev ref sz idx) = idx"

lemma aci_invs':
  assumes Q_ignores_arch[simp]: "\<And>f s. Q (arch_state_update f s) = Q s"
  assumes Q_ignore_machine_state[simp]: "\<And>f s. Q (machine_state_update f s) = Q s"
  assumes Q_detype[simp]: "\<And>f s. Q (detype f s) = Q s"
  assumes cap_insert_Q: "\<And>cap src dest. \<lbrace>Q and invs and K (src \<noteq> dest)\<rbrace>
                            cap_insert cap src dest
                           \<lbrace>\<lambda>_.Q\<rbrace>"
  assumes retype_region_Q[wp]:"\<And>a b c d e. \<lbrace>Q\<rbrace> retype_region a b c d e \<lbrace>\<lambda>_.Q\<rbrace>"
  assumes set_cap_Q[wp]: "\<And>a b. \<lbrace>Q\<rbrace> set_cap a b \<lbrace>\<lambda>_.Q\<rbrace>"
  shows
  "\<lbrace>invs and Q and ct_active and valid_aci aci\<rbrace> perform_asid_control_invocation aci \<lbrace>\<lambda>y s. invs s \<and> Q s\<rbrace>"
  proof -
  have cap_insert_invsQ:
       "\<And>cap src dest ap asid.
        \<lbrace>Q and (invs and valid_cap cap and tcb_cap_valid cap dest and
         ex_cte_cap_wp_to (appropriate_cte_cap cap) dest and
         cte_wp_at (\<lambda>c. c = NullCap) dest and
         no_cap_to_obj_with_diff_ref cap {dest} and
         (\<lambda>s. cte_wp_at (safe_parent_for (cdt s) src cap) src s) and
         K (cap = ArchObjectCap (ASIDPoolCap ap asid)) and
         (\<lambda>s. \<forall>irq\<in>cap_irqs cap. irq_issued irq s) and
         ko_at (ArchObj (ASIDPool Map.empty)) ap and
         (\<lambda>s. ap \<notin> ran (arm_asid_table (arch_state s)) \<and>
         arm_asid_table (arch_state s) (asid_high_bits_of asid) = None))\<rbrace>
         cap_insert cap src dest
        \<lbrace>\<lambda>rv s.
           invs
             (s\<lparr>arch_state := arch_state s
                 \<lparr>arm_asid_table := (arm_asid_table \<circ> arch_state) s
                    (asid_high_bits_of asid \<mapsto> ap)\<rparr>\<rparr>) \<and>
           Q
             (s\<lparr>arch_state := arch_state s
                 \<lparr>arm_asid_table := (arm_asid_table \<circ> arch_state) s
                    (asid_high_bits_of asid \<mapsto> ap)\<rparr>\<rparr>)\<rbrace>"
        apply (wp cap_insert_ap_invs)
        apply simp
        apply (rule hoare_pre)
        apply (rule cap_insert_Q)
        apply (auto simp: cte_wp_at_caps_of_state)
        done
  show ?thesis
  apply (clarsimp simp: perform_asid_control_invocation_def valid_aci_def
    split: asid_control_invocation.splits)
  apply (rename_tac word1 a b aa ba word2)
  apply (rule hoare_pre)
   apply (wp hoare_vcg_const_imp_lift)
     apply (wp cap_insert_invsQ hoare_vcg_ex_lift
             | simp)+
    apply (simp add: valid_cap_def |
           strengthen real_cte_tcb_valid safe_parent_strg
                      invs_vobjs_strgs
                      ex_cte_cap_to_cnode_always_appropriate_strg)+
    apply (wp hoare_vcg_const_imp_lift set_free_index_invs
              retype_region_plain_invs[where sz = pageBits]
              retype_cte_wp_at[where sz = pageBits] hoare_vcg_ex_lift
              retype_region_obj_at_other3[where P="is_cap_table n" and sz = pageBits for n]
              retype_region_ex_cte_cap_to[where sz = pageBits]
              retype_region_ap[simplified]
              retype_region_ap'[simplified]
              retype_region_no_cap_to_obj[where sz = pageBits,simplified]
               | simp del: split_paired_Ex)+
    apply (strengthen invs_valid_objs invs_psp_aligned
           invs_mdb invs_valid_pspace
           exI[where x="case aci of MakePool frame slot parent base \<Rightarrow> parent"]
           exI[where x="case aci of MakePool frame slot parent base \<Rightarrow> parent",
             simplified]
           caps_region_kernel_window_imp[where
             p = "case aci of MakePool frame slot parent base \<Rightarrow> parent"]
           invs_cap_refs_in_kernel_window)+
    apply (wp set_cap_caps_no_overlap set_cap_no_overlap get_cap_wp
      max_index_upd_caps_overlap_reserved max_index_upd_invs_simple
      set_cap_cte_cap_wp_to set_cap_cte_wp_at max_index_upd_no_cap_to
      | simp split del: if_split | wp_once hoare_vcg_ex_lift)+
    apply (rule_tac P = "is_aligned word1 page_bits" in hoare_gen_asm)
    apply (subst delete_objects_rewrite)
       apply (simp add:page_bits_def pageBits_def word_size_bits_def)
      apply (simp add:page_bits_def pageBits_def word_bits_def)
     apply (simp add:is_aligned_neg_mask_eq)
    apply wp
  apply (clarsimp simp: cte_wp_at_caps_of_state if_option_Some
                        Word_Miscellaneous.if_bool_simps
             split del: if_split)
  apply (strengthen refl)
  apply (frule_tac cap = "(cap.UntypedCap False word1 pageBits idx)"
    in detype_invariants[rotated 3],clarsimp+)
    apply (simp add:cte_wp_at_caps_of_state)+
   apply (simp add:descendants_range_def2 empty_descendants_range_in)
  apply (simp add:invs_mdb invs_valid_pspace invs_psp_aligned invs_valid_objs)
  apply (clarsimp dest!:caps_of_state_cteD)
  apply (frule(1) unsafe_protected[where p=t and p'=t for t])
     apply (simp add:empty_descendants_range_in)+
    apply fastforce
   apply clarsimp
  apply (frule_tac p = "(aa,ba)" in cte_wp_valid_cap)
   apply fastforce
  apply (clarsimp simp: detype_clear_um_independent obj_bits_api_def arch_kobj_size_def
   default_arch_object_def conj_comms)
  apply (rule conjI)
   apply (clarsimp simp:valid_cap_simps cap_aligned_def page_bits_def not_le)
  apply clarsimp
  apply (simp add:empty_descendants_range_in)
  apply (frule valid_cap_aligned)
  apply (clarsimp simp: cap_aligned_def is_aligned_neg_mask_eq)
  apply (subst caps_no_overlap_detype[OF descendants_range_caps_no_overlapI],
    assumption, simp add: is_aligned_neg_mask_eq,
    simp add: empty_descendants_range_in)
  apply (frule pspace_no_overlap_detype, clarify+)
  apply (frule intvl_range_conv[where bits = pageBits])
   apply (simp add:pageBits_def word_bits_def)
  apply (simp add:is_aligned_neg_mask_eq)
  apply (clarsimp simp:is_aligned_neg_mask_eq page_bits_def)
  apply (frule(1) ex_cte_cap_protects)
      apply (simp add:empty_descendants_range_in)
     apply fastforce
    apply (rule subset_refl)
   apply fastforce
  apply (clarsimp simp: field_simps)
  apply (intro conjI impI,
     simp_all add:free_index_of_def valid_cap_simps valid_untyped_def
     empty_descendants_range_in range_cover_full clear_um_def max_free_index_def,
     (clarsimp simp:valid_untyped_def valid_cap_simps)+)[1]

    apply (erule(1) cap_to_protected)
    apply (simp add:empty_descendants_range_in descendants_range_def2)+

   apply clarsimp
   apply (drule invs_arch_state)+
   apply (clarsimp simp: valid_arch_state_def valid_asid_table_def)
   apply (drule (1) bspec)+
   apply clarsimp
   apply (erule notE, erule is_aligned_no_overflow)

  apply (clarsimp simp: no_cap_to_obj_with_diff_ref_def)
  apply (thin_tac "cte_wp_at ((=) cap.NullCap) p s" for p s)
  apply (subst(asm) eq_commute,
         erule(1) untyped_children_in_mdbE[where cap="cap.UntypedCap dev p bits idx" for dev p bits idx,
                                         simplified, rotated])
    apply (simp add: is_aligned_no_overflow)
   apply simp
  apply clarsimp
  done

qed

lemmas aci_invs[wp] = aci_invs'[where Q=\<top>,simplified hoare_post_taut, OF refl refl refl TrueI TrueI TrueI,simplified]

lemma invoke_arch_invs[wp]:
  "\<lbrace>invs and ct_active and valid_arch_inv ai\<rbrace>
   arch_perform_invocation ai
   \<lbrace>\<lambda>rv. invs\<rbrace>"
  apply (cases ai, simp_all add: valid_arch_inv_def arch_perform_invocation_def)
  apply (wp|simp)+
  done

lemma sts_empty_pde [wp]:
  "\<lbrace>empty_pde_at p\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv. empty_pde_at p\<rbrace>"
  apply (simp add: empty_pde_at_def)
  apply (rule hoare_pre)
   apply (wp hoare_vcg_ex_lift set_thread_state_ko)
  apply (clarsimp simp: is_tcb_def)
  done

lemma sts_pd_at_asid [wp]:
  "\<lbrace>vspace_at_asid asid pd\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv. vspace_at_asid asid pd\<rbrace>"
  apply (simp add: vspace_at_asid_def)
  apply wp
  done


lemma sts_same_refs_inv[wp]:
  "\<lbrace>\<lambda>s. same_refs m cap s\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv s. same_refs m cap s\<rbrace>"
  by (cases m, (clarsimp simp: same_refs_def, wp)+)


lemma sts_valid_slots_inv[wp]:
  "\<lbrace>valid_slots m\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv. valid_slots m\<rbrace>"
  by (cases m, (clarsimp simp: valid_slots_def, wp hoare_vcg_ball_lift sts.vs_lookup sts_typ_ats)+)


lemma sts_valid_page_inv[wp]:
"\<lbrace>valid_page_inv page_invocation\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv. valid_page_inv page_invocation\<rbrace>"
  by (cases page_invocation,
       (wp hoare_vcg_const_Ball_lift hoare_vcg_ex_lift hoare_vcg_imp_lift sts_typ_ats
        | clarsimp simp: valid_page_inv_def same_refs_def
        | wps)+)


lemma sts_valid_pdi_inv[wp]:
  "\<lbrace>valid_pdi page_directory_invocation\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv. valid_pdi page_directory_invocation\<rbrace>"
  apply (cases page_directory_invocation)
   apply (wp | simp add: valid_pdi_def)+
  done


lemma sts_valid_arch_inv:
  "\<lbrace>valid_arch_inv ai\<rbrace> set_thread_state t st \<lbrace>\<lambda>rv. valid_arch_inv ai\<rbrace>"
  apply (cases ai, simp_all add: valid_arch_inv_def)
     apply (rename_tac page_table_invocation)
     apply (case_tac page_table_invocation, simp_all add: valid_pti_def)[1]
      apply ((wp valid_pde_lift set_thread_state_valid_cap
                 hoare_vcg_all_lift hoare_vcg_const_imp_lift
                 hoare_vcg_ex_lift set_thread_state_ko
                 sts_typ_ats set_thread_state_cte_wp_at
               | clarsimp simp: is_tcb_def)+)[4]
   apply (rename_tac asid_control_invocation)
   apply (case_tac asid_control_invocation)
   apply (clarsimp simp: valid_aci_def cte_wp_at_caps_of_state)
   apply (rule hoare_pre, wp hoare_vcg_ex_lift cap_table_at_typ_at)
   apply clarsimp
  apply (clarsimp simp: valid_apinv_def split: asid_pool_invocation.splits)
  apply (rule hoare_pre)
   apply (wp hoare_vcg_ex_lift set_thread_state_ko)
  apply (clarsimp simp: is_tcb_def)
  done


crunch inv[wp]: ensure_safe_mapping "P"
  (wp: mapME_x_inv_wp)


(* the induct rule matches the wrong parameters first -> crunch blows up *)
lemma create_mapping_entries_inv [wp]:
  "\<lbrace>P\<rbrace> create_mapping_entries base vptr vmsz R A pd \<lbrace>\<lambda>_. P\<rbrace>"
  by (induct vmsz; wpsimp wp: lookup_pt_slot_inv)


crunch_ignore (add: select_ext)

crunch inv [wp]: arch_decode_invocation "P"
  (wp: crunch_wps select_wp select_ext_weak_wp simp: crunch_simps)


lemma create_mappings_empty [wp]:
  "\<lbrace>\<top>\<rbrace> create_mapping_entries base vptr vmsz R A pd \<lbrace>\<lambda>m s. empty_refs m\<rbrace>, -"
  by (cases vmsz; wpsimp simp: pde_ref_def empty_refs_def)


lemma empty_pde_atI:
  "\<lbrakk> ko_at (ArchObj (PageDirectory pd)) (p && ~~ mask pd_bits) s;
     pd (ucast (p && mask pd_bits >> 2)) = InvalidPDE \<rbrakk> \<Longrightarrow>
   empty_pde_at p s"
  by (fastforce simp add: empty_pde_at_def)


declare lookup_slot_for_cnode_op_cap_to [wp]


lemma shiftr_irrelevant:
  "x < 2 ^ asid_low_bits \<Longrightarrow> is_aligned (y :: word32) asid_low_bits \<Longrightarrow>
    x + y >> asid_low_bits = y >> asid_low_bits"
  apply (subst word_plus_and_or_coroll)
   apply (rule word_eqI)
   apply (clarsimp simp: is_aligned_nth)
   apply (drule(1) nth_bounded)
    apply (simp add: asid_low_bits_def word_bits_def)
   apply simp
  apply (rule word_eqI)
  apply (simp add: nth_shiftr)
  apply safe
  apply (drule(1) nth_bounded)
   apply (simp add: asid_low_bits_def word_bits_def)
  apply simp
  done

lemma map_up_enum_0x3C:
  "is_aligned (r::32 word) 6 \<Longrightarrow> map (\<lambda>x. x + r) [0 , 4 .e. 0x3C] = [r, r + 4 .e. r + 0x3C]"
  apply (simp add: upto_enum_step_def upto_enum_def not_less)
  apply (drule is_aligned_no_overflow')
  apply simp
  apply (erule word_plus_mono_right2)
  apply simp
  done

lemma create_mapping_entries_parent_for_refs:
  "\<lbrace>invs and \<exists>\<rhd> pd and page_directory_at pd
           and K (is_aligned pd pd_bits) and K (vmsz_aligned vptr pgsz)
           and K (vptr < kernel_base)\<rbrace>
    create_mapping_entries ptr vptr pgsz
                 rights attribs pd
   \<lbrace>\<lambda>rv s. \<exists>a b. cte_wp_at (parent_for_refs rv) (a, b) s\<rbrace>, -"
  apply (rule hoare_gen_asmE)+
  apply (cases pgsz, simp_all add: vmsz_aligned_def largePagePTE_offsets_def
                                   superSectionPDE_offsets_def)
     apply (rule hoare_pre)
      apply wp
      apply (rule hoare_post_imp_R, rule lookup_pt_slot_cap_to)
      apply (elim exEI)
      apply (clarsimp simp: cte_wp_at_caps_of_state parent_for_refs_def)
     apply simp
    apply (rule hoare_pre)
     apply wp
     apply (rule hoare_post_imp_R)
      apply (rule lookup_pt_slot_cap_to_multiple1)
     apply (elim conjE exEI cte_wp_at_weakenE)
     apply (clarsimp simp: cte_wp_at_caps_of_state parent_for_refs_def
                           subset_iff p_0x3C_shift map_up_enum_0x3C)
    apply simp
   apply (rule hoare_pre, wp)
   apply (clarsimp dest!:vs_lookup_pages_vs_lookupI)
   apply (drule valid_vs_lookupD, clarsimp)
   apply (simp, elim exEI)
   apply (clarsimp simp: cte_wp_at_caps_of_state parent_for_refs_def
                         lookup_pd_slot_def Let_def)
   apply (subst pd_shifting, simp add: pd_bits_def pageBits_def)
   apply (clarsimp simp: vs_cap_ref_def
                  split: cap.split_asm arch_cap.split_asm option.split_asm)
     apply (auto simp: valid_cap_def obj_at_def is_cap_simps cap_asid_def
                dest!: caps_of_state_valid_cap split:if_splits)[3]
     apply (frule(1) caps_of_state_valid)
     apply (clarsimp simp:valid_cap_def obj_at_def)
   apply (simp add:is_cap_simps)
  apply (rule hoare_pre, wp)
  apply (clarsimp dest!:vs_lookup_pages_vs_lookupI)
  apply (drule valid_vs_lookupD, clarsimp)
  apply (simp, elim exEI)
  apply (clarsimp simp: cte_wp_at_caps_of_state parent_for_refs_def)
  apply (rule conjI)
   apply (simp add: subset_eq)
    apply (clarsimp simp: lookup_pd_slot_add_eq)
  apply (clarsimp simp: vs_cap_ref_def
                 split: cap.split_asm arch_cap.split_asm option.split_asm)
       apply (auto simp: valid_cap_def obj_at_def is_cap_simps cap_asid_def
             dest!: caps_of_state_valid_cap split:if_splits)[3]
   apply (frule(1) caps_of_state_valid)
   apply (clarsimp simp:valid_cap_def obj_at_def)
  apply (simp add:is_cap_simps)
  done


lemma find_pd_for_asid_shifting_voodoo:
  "\<lbrace>pspace_aligned and valid_vspace_objs\<rbrace>
     find_pd_for_asid asid
   \<lbrace>\<lambda>rv s. v >> 20 = rv + (v >> 20 << 2) && mask pd_bits >> 2\<rbrace>,-"
  apply (rule hoare_post_imp_R,
         rule find_pd_for_asid_aligned_pd)
  apply (subst pd_shifting_dual, simp)
  apply (rule word_eqI)
  apply (simp add: nth_shiftr nth_shiftl word_size)
  apply safe
  apply (drule test_bit_size)
  apply (simp add: word_size)
  done


lemma find_pd_for_asid_ref_offset_voodoo:
  "\<lbrace>pspace_aligned and valid_vspace_objs and
         K (ref = [VSRef (asid && mask asid_low_bits) (Some AASIDPool),
                  VSRef (ucast (asid_high_bits_of asid)) None])\<rbrace>
      find_pd_for_asid asid
   \<lbrace>\<lambda>rv. (ref \<rhd> (rv + (v >> 20 << 2) && ~~ mask pd_bits))\<rbrace>,-"
  apply (rule hoare_gen_asmE)
  apply (rule_tac Q'="\<lambda>rv s. is_aligned rv 14 \<and> (ref \<rhd> rv) s"
               in hoare_post_imp_R)
   apply (simp add: ucast_ucast_mask
                    mask_asid_low_bits_ucast_ucast)
   apply (fold asid_low_bits_def)
   apply (rule hoare_pre, wp find_pd_for_asid_lookup_ref)
   apply (simp add: )
  apply (simp add: pd_shifting)
  done


declare asid_high_bits_of_shift [simp]
declare mask_shift [simp]
declare word_less_sub_le [simp del]
declare ptrFormPAddr_addFromPPtr [simp]


(* FIXME: move *)
lemma valid_mask_vm_rights[simp]:
  "mask_vm_rights V R \<in> valid_vm_rights"
  by (simp add: mask_vm_rights_def)


lemma vs_lookup_and_unique_refs:
  "\<lbrakk>(ref \<rhd> p) s; caps_of_state s cptr = Some cap; table_cap_ref cap = Some ref';
    p \<in> obj_refs cap; valid_vs_lookup s; unique_table_refs (caps_of_state s)\<rbrakk>
   \<Longrightarrow> ref = ref'"
  apply (frule_tac ref=ref in valid_vs_lookupD[OF vs_lookup_pages_vs_lookupI], assumption)
  apply clarsimp
  apply (frule_tac cap'=capa in unique_table_refsD)
     apply simp+
   apply (case_tac capa, simp_all)
        apply ((case_tac cap, simp_all)+)[6]
     apply (clarsimp simp add: table_cap_ref_def vs_cap_ref_def split: cap.splits arch_cap.splits option.splits)
  done


lemma valid_global_ptsD2:
  "\<lbrakk>r \<in> set (arm_global_pts (arch_state s)); valid_global_pts s\<rbrakk>
   \<Longrightarrow> \<exists>pt. ko_at (ArchObj (PageTable pt)) r s"
  apply (clarsimp simp: valid_global_pts_def)
  apply (drule (1) bspec)
  apply (clarsimp simp: obj_at_def)
  done


lemma create_mapping_entries_same_refs:
  "\<lbrace>valid_arch_state and valid_vspace_objs and valid_vs_lookup and (\<lambda>s. unique_table_refs (caps_of_state s))
    and pspace_aligned and valid_objs and valid_kernel_mappings and \<exists>\<rhd> pd and
    (\<lambda>s. \<exists>pd_cap pd_cptr. cte_wp_at (diminished pd_cap) pd_cptr s
          \<and> pd_cap = cap.ArchObjectCap (arch_cap.PageDirectoryCap pd (Some asid))) and
    page_directory_at pd and K (vaddr < kernel_base \<and> (cap = (cap.ArchObjectCap (arch_cap.PageCap dev p rights' pgsz (Some (asid, vaddr))))))\<rbrace>
   create_mapping_entries (addrFromPPtr p) vaddr pgsz rights attribs pd
   \<lbrace>\<lambda>rv s. same_refs rv cap s\<rbrace>,-"
  apply (rule hoare_gen_asmE)
  apply (cases pgsz, simp_all add: lookup_pt_slot_def
                                   largePagePTE_offsets_def superSectionPDE_offsets_def)
     apply (wp get_pde_wp | wpc)+
     apply (clarsimp simp: lookup_pd_slot_def)
     apply (frule (1) pd_aligned)
     apply (simp add:pd_shifting vaddr_segment_nonsense2 pt_bits_def)
     apply (frule (2) valid_vspace_objsD[rotated], simp)
     apply (drule bspec, simp, erule kernel_base_kernel_mapping_slots)
     apply (simp, drule (1) pt_aligned)
     apply (clarsimp simp: same_refs_def vs_cap_ref_def split: option.splits)
     apply (simp add: vaddr_segment_nonsense4 shiftl_shiftr_id
                      less_trans[OF and_mask_less'[where n=8, unfolded mask_def, simplified]]
                      word_bits_def
                      vaddr_segment_nonsense3)
     apply (rule conjI, simp add: mask_def)
     apply (clarsimp simp: cte_wp_at_caps_of_state diminished_def
                           mask_cap_def cap_rights_update_def)
     apply (clarsimp split: Structures_A.cap.splits )
     apply (clarsimp simp: acap_rights_update_def split: arch_cap.splits)
     apply (frule (1) vs_lookup_and_unique_refs)
         apply (simp_all add: table_cap_ref_def obj_refs_def)[4]
     apply (frule_tac p=pd and p'="ptrFromPAddr x" in vs_lookup_step)
      apply (clarsimp simp: vs_lookup1_def)
      apply (rule exI, erule conjI)
      apply (rule exI[where x="VSRef (vaddr >> 20) (Some APageDirectory)"])
      apply (rule conjI, rule refl)
      apply (simp add: vs_refs_def)
      apply (rule_tac x="(ucast (vaddr >> 20), ptrFromPAddr x)" in image_eqI)
       apply (simp add: ucast_ucast_len[OF shiftr_less_t2n'] mask_32_max_word graph_of_def)
      apply (clarsimp simp:graph_of_def)
      apply (frule kernel_base_kernel_mapping_slots, simp add: pde_ref_def)
     apply simp
     apply (drule (1) ref_is_unique)
     apply (rule not_kernel_slot_not_global_pt[simplified second_level_tables_def, rotated])
              apply (erule kernel_base_kernel_mapping_slots)
             apply (simp add: obj_at_def)
            apply (simp_all add: pde_ref_def valid_arch_state_def valid_objs_caps)[8]
    apply (wp get_pde_wp | wpc)+
    apply (clarsimp simp: lookup_pd_slot_def)
    apply (frule (1) pd_aligned)
    apply (simp add:pd_shifting vaddr_segment_nonsense2)
    apply (frule (2) valid_vspace_objsD[rotated], simp)
    apply (drule bspec, simp, erule kernel_base_kernel_mapping_slots)
    apply (simp, drule (1) pt_aligned)
    apply (clarsimp simp: same_refs_def vs_cap_ref_def upto_enum_step_def upto_enum_word upt_conv_Cons)
    apply (simp add: vaddr_segment_nonsense4 shiftl_shiftr_id
                     less_trans[OF and_mask_less'[where n=8, unfolded mask_def, simplified]]
                     word_bits_def
                     vaddr_segment_nonsense3)
    apply (rule conjI, simp add: mask_def)
    apply (clarsimp simp: cte_wp_at_caps_of_state diminished_def
                          mask_cap_def cap_rights_update_def)
    apply (clarsimp split: Structures_A.cap.splits )
    apply (clarsimp simp: acap_rights_update_def split: arch_cap.splits)
    apply (frule (1) vs_lookup_and_unique_refs)
        apply (simp_all add: table_cap_ref_def obj_refs_def)[4]
    apply (frule_tac p=pd and p'="ptrFromPAddr x" in vs_lookup_step)
     apply (clarsimp simp: vs_lookup1_def)
     apply (rule exI, erule conjI)
     apply (rule exI[where x="VSRef (vaddr >> 20) (Some APageDirectory)"])
     apply (rule conjI, rule refl)
     apply (simp add: vs_refs_def)
     apply (rule_tac x="(ucast (vaddr >> 20), ptrFromPAddr x)" in image_eqI)
      apply (simp add: ucast_ucast_len[OF shiftr_less_t2n'] mask_32_max_word graph_of_def)
     apply (clarsimp simp:graph_of_def)
     apply (frule kernel_base_kernel_mapping_slots, simp add: pde_ref_def)
    apply simp
    apply (drule (1) ref_is_unique)
    apply (rule not_kernel_slot_not_global_pt[simplified second_level_tables_def, rotated])
             apply (erule kernel_base_kernel_mapping_slots)
            apply (simp add: obj_at_def)
           apply (simp_all add: pde_ref_def valid_arch_state_def valid_objs_caps)[8]
   apply (wp get_pde_wp returnOKE_R_wp | wpc)+
   apply (clarsimp simp: lookup_pd_slot_def)
   apply (frule (1) pd_aligned)
   apply (clarsimp simp: same_refs_def vs_cap_ref_def pde_ref_pages_def)
   apply (simp add: vaddr_segment_nonsense vaddr_segment_nonsense2)
   apply (clarsimp simp: cte_wp_at_caps_of_state diminished_def
                         mask_cap_def cap_rights_update_def)
   apply (clarsimp split: Structures_A.cap.splits )
   apply (clarsimp simp: acap_rights_update_def split: arch_cap.splits)
   apply (frule (1) vs_lookup_and_unique_refs)
       apply (simp_all add: table_cap_ref_def obj_refs_def)[4]
   apply (drule (1) ref_is_unique)
         apply (clarsimp simp: valid_arch_state_def obj_at_def dest!:valid_global_ptsD2)
        apply (simp_all add: valid_arch_state_def valid_objs_caps)[6]
   apply (wp returnOKE_R_wp | wpc)+
   apply (clarsimp simp: lookup_pd_slot_def)
   apply (frule (1) pd_aligned)
   apply (clarsimp simp: same_refs_def vs_cap_ref_def pde_ref_pages_def upto_enum_step_def upto_enum_word upt_conv_Cons)
   apply (simp add: vaddr_segment_nonsense vaddr_segment_nonsense2)
   apply (clarsimp simp: cte_wp_at_caps_of_state diminished_def
                         mask_cap_def cap_rights_update_def)
   apply (clarsimp split: Structures_A.cap.splits )
   apply (clarsimp simp: acap_rights_update_def split: arch_cap.splits)
   apply (frule (1) vs_lookup_and_unique_refs)
       apply (simp_all add: table_cap_ref_def obj_refs_def)[4]
   apply (drule (1) ref_is_unique)
         apply (clarsimp dest!: valid_global_ptsD2 simp: obj_at_def a_type_def valid_arch_state_def)
        apply (simp_all add: valid_arch_state_def valid_objs_caps)
  done


lemma create_mapping_entries_same_refs_ex:
  "\<lbrace>valid_arch_state and valid_vspace_objs and valid_vs_lookup and (\<lambda>s. unique_table_refs (caps_of_state s))
    and pspace_aligned and valid_objs and valid_kernel_mappings and \<exists>\<rhd> pd and
    (\<lambda>s. \<exists>dev pd_cap pd_cptr asid rights'. cte_wp_at (diminished pd_cap) pd_cptr s
          \<and> pd_cap = cap.ArchObjectCap (arch_cap.PageDirectoryCap pd (Some asid))
          \<and> page_directory_at pd s \<and> vaddr < kernel_base \<and> (cap = (cap.ArchObjectCap (arch_cap.PageCap dev p rights' pgsz (Some (asid, vaddr))))))\<rbrace>
   create_mapping_entries (addrFromPPtr p) vaddr pgsz rights attribs pd
   \<lbrace>\<lambda>rv s. same_refs rv cap s\<rbrace>,-"
  apply (clarsimp simp: validE_R_def validE_def valid_def split: sum.split)
  apply (erule use_validE_R[OF _ create_mapping_entries_same_refs])
  apply fastforce
  done


lemma diminished_pd_capD:
  "diminished (ArchObjectCap (PageDirectoryCap a b)) cap
   \<Longrightarrow> cap = (ArchObjectCap (PageDirectoryCap a b))"
  apply (clarsimp simp: diminished_def mask_cap_def cap_rights_update_def)
  apply (clarsimp simp: acap_rights_update_def split: cap.splits arch_cap.splits)
  done


lemma diminished_pd_self:
  "diminished (ArchObjectCap (PageDirectoryCap a b)) (ArchObjectCap (PageDirectoryCap a b))"
  apply (clarsimp simp: diminished_def mask_cap_def cap_rights_update_def)
  apply (clarsimp simp: acap_rights_update_def split: cap.splits arch_cap.splits)
  done


lemma cte_wp_at_page_cap_weaken:
  "cte_wp_at (diminished (ArchObjectCap (PageCap dev word seta vmpage_size None))) slot s \<Longrightarrow>
   cte_wp_at (\<lambda>a. \<exists>dev p R sz m. a = ArchObjectCap (PageCap dev p R sz m)) slot s"
  apply (clarsimp simp: cte_wp_at_def diminished_def mask_cap_def cap_rights_update_def)
  apply (clarsimp simp: acap_rights_update_def split: cap.splits arch_cap.splits)
  done

lemma find_pd_for_asid_lookup_pd_wp:
  "\<lbrace> \<lambda>s. valid_vspace_objs s \<and> (\<forall>pd. vspace_at_asid asid pd s \<and> page_directory_at pd s
    \<and> (\<exists>\<rhd> pd) s \<longrightarrow> Q pd s) \<rbrace> find_pd_for_asid asid \<lbrace> Q \<rbrace>, -"
  apply (rule hoare_post_imp_R)
   apply (rule hoare_vcg_conj_lift_R[OF find_pd_for_asid_page_directory])
   apply (rule hoare_vcg_conj_lift_R[OF find_pd_for_asid_lookup, simplified])
   apply (rule hoare_vcg_conj_lift_R[OF find_pd_for_asid_pd_at_asid, simplified])
   apply (wp_once find_pd_for_asid_inv)
  apply auto
  done


lemma aligned_sum_less_kernel_base:
  "vmsz_aligned p sz
    \<Longrightarrow> (p + 2 ^ pageBitsForSize sz - 1 < kernel_base) = (p < kernel_base)"
  apply (rule iffI)
   apply (rule le_less_trans)
    apply (rule is_aligned_no_overflow)
    apply (simp add: vmsz_aligned_def)
   apply simp
  apply (simp add:field_simps[symmetric])
  apply (erule gap_between_aligned)
    apply (simp add: vmsz_aligned_def)+
   apply (case_tac sz,simp_all add:kernel_base_def is_aligned_def)+
  done


lemma arch_decode_inv_wf[wp]:
  "\<lbrace>invs and valid_cap (cap.ArchObjectCap arch_cap) and
    cte_wp_at (diminished (cap.ArchObjectCap arch_cap)) slot and
    (\<lambda>s. \<forall>x \<in> set excaps. cte_wp_at (diminished (fst x)) (snd x) s)\<rbrace>
     arch_decode_invocation label args cap_index slot arch_cap excaps
   \<lbrace>valid_arch_inv\<rbrace>,-"
  apply (cases arch_cap)
      apply (rename_tac word1 word2)
      apply (simp add: arch_decode_invocation_def Let_def split_def cong: if_cong split del: if_split)
      apply (rule hoare_pre)
       apply ((wp whenE_throwError_wp check_vp_wpR ensure_empty_stronger select_wp select_ext_weak_wp|
               wpc|
               simp add: valid_arch_inv_def valid_apinv_def)+)[1]
      apply (simp add: valid_arch_inv_def valid_apinv_def)
      apply (intro allI impI ballI)
      apply (elim conjE exE)
      apply simp
      apply (clarsimp simp: dom_def neq_Nil_conv)
      apply (thin_tac "Ball S P" for S P)+
      apply (clarsimp simp: valid_cap_def)
      apply (rule conjI)
       apply (clarsimp simp: obj_at_def)
       apply (subgoal_tac "ucast (ucast xa + word2) = xa")
        apply simp
       apply (simp add: is_aligned_nth)
       apply (subst word_plus_and_or_coroll)
        apply (rule word_eqI)
        apply (clarsimp simp: word_size word_bits_def nth_ucast)
        apply (drule test_bit_size)
        apply (simp add: word_size asid_low_bits_def)
       apply (rule word_eqI)
       apply (clarsimp simp: word_size word_bits_def nth_ucast)
       apply (auto simp: asid_low_bits_def)[1]
      apply (rule conjI)
       apply (clarsimp simp add: cte_wp_at_caps_of_state)
       apply (rename_tac c c')
       apply (frule_tac cap=c' in caps_of_state_valid, assumption)
       apply (drule (1) diminished_is_update)
       apply (clarsimp simp: is_pd_cap_def cap_rights_update_def
                             acap_rights_update_def)
      apply (clarsimp simp: word_neq_0_conv)
      apply (rule conjI)
       apply (subst field_simps, erule is_aligned_add_less_t2n)
         apply (simp add: asid_low_bits_def)
         apply (rule ucast_less[where 'b=10, simplified], simp)
        apply (simp add: asid_low_bits_def asid_bits_def)
       apply (simp add: asid_bits_def)
      apply (drule vs_lookup_atI)
      apply (subst asid_high_bits_of_add_ucast, assumption)
      apply assumption
     apply (simp add: arch_decode_invocation_def Let_def split_def
                 cong: if_cong split del: if_split)
     apply (rule hoare_pre)
      apply ((wp whenE_throwError_wp check_vp_wpR ensure_empty_stronger|
              wpc|
              simp add: valid_arch_inv_def valid_aci_def is_aligned_shiftl_self)+)[1]
             apply (rule_tac Q'=
                         "\<lambda>rv. real_cte_at rv and
                               ex_cte_cap_wp_to is_cnode_cap rv and
                               (\<lambda>s. descendants_of (snd (excaps!0)) (cdt s) = {}) and
                               cte_wp_at (\<lambda>c. \<exists>idx. c = (cap.UntypedCap False frame pageBits idx)) (snd (excaps!0)) and
                               (\<lambda>s. arm_asid_table (arch_state s) free = None)"
                         in hoare_post_imp_R)
              apply (simp add: lookup_target_slot_def)
              apply wp
             apply (clarsimp simp: cte_wp_at_def)
             apply (rule conjI, clarsimp)
             apply (rule shiftl_less_t2n)
              apply (rule order_less_le_trans, rule ucast_less, simp)
              apply (simp add: asid_bits_def asid_low_bits_def)
             apply (simp add: asid_bits_def)
            apply (simp split del: if_split)
            apply (wp ensure_no_children_sp select_ext_weak_wp select_wp whenE_throwError_wp | wpc | simp add: K_bind_def)+
     apply clarsimp
     apply (rule conjI, fastforce)
     apply (cases excaps, simp)
     apply (case_tac list, simp)
     apply clarsimp
     apply (rule conjI)
      apply (drule cte_wp_at_norm, clarsimp, drule cte_wp_valid_cap, fastforce)+
      apply (clarsimp simp add: diminished_def)
     apply (rule conjI)
      apply clarsimp
      apply (simp add: ex_cte_cap_wp_to_def)
      apply (rule_tac x=ac in exI)
      apply (rule_tac x=ba in exI)
      apply (clarsimp simp add: cte_wp_at_caps_of_state)
      apply (drule (1) caps_of_state_valid[rotated])+
      apply (drule (1) diminished_is_update)+
      apply (clarsimp simp: is_cap_simps cap_rights_update_def)
     apply (clarsimp simp add: cte_wp_at_caps_of_state)
     apply (drule (1) caps_of_state_valid[rotated])+
     apply (drule (1) diminished_is_update)+
     apply (clarsimp simp: cap_rights_update_def)
    apply (clarsimp simp:diminished_def)
    apply (simp add: arch_decode_invocation_def Let_def split_def
                cong: if_cong split del: if_split)

    apply (cases "invocation_type label = ArchInvocationLabel ARMPageMap")
     apply (rename_tac dev word rights vmpage_size option)
     apply (simp split del: if_split)
     apply (rule hoare_pre)
      apply ((wp whenE_throwError_wp check_vp_wpR hoare_vcg_const_imp_lift_R
                 create_mapping_entries_parent_for_refs find_pd_for_asid_pd_at_asid
                 create_mapping_entries_valid_slots create_mapping_entries_same_refs_ex
                 find_pd_for_asid_lookup_pd_wp
             | wpc
             | simp add: valid_arch_inv_def valid_page_inv_def is_pg_cap_def))+
     apply (clarsimp simp: neq_Nil_conv invs_vspace_objs)
     apply (frule diminished_cte_wp_at_valid_cap[where p="(a, b)" for a b], clarsimp)
     apply (frule diminished_cte_wp_at_valid_cap[where p=slot], clarsimp)
     apply (clarsimp simp: cte_wp_at_caps_of_state mask_cap_def conj_ac
                           diminished_def[where cap="ArchObjectCap (PageCap d x y z w)" for d x y z w]
                           linorder_not_le aligned_sum_less_kernel_base
                    dest!: diminished_pd_capD)
     apply (clarsimp simp: cap_rights_update_def acap_rights_update_def
                    split: cap.splits arch_cap.splits)
     apply (auto, auto simp: cte_wp_at_caps_of_state invs_def valid_state_def
                             valid_cap_simps is_arch_update_def
                             is_arch_cap_def cap_master_cap_simps
                             vmsz_aligned_def vs_cap_ref_def
                             cap_aligned_def data_at_def
                             le_mask_iff_lt_2n[where 'a=32, folded word_bits_def, THEN iffD1]
                             ord_eq_le_trans[OF pd_bits_14]
                       elim: is_aligned_weaken split: vmpage_size.split
                      split: if_splits
                     intro!: is_aligned_addrFromPPtr pbfs_atleast_pageBits,
            (fastforce intro: diminished_pd_self)+)[1]

    apply (cases "invocation_type label = ArchInvocationLabel ARMPageRemap")
     apply (rename_tac word rights vmpage_size option)
     apply (simp split del: if_split)
     apply (rule hoare_pre)
      apply ((wp whenE_throwError_wp check_vp_wpR hoare_vcg_const_imp_lift_R
                 create_mapping_entries_parent_for_refs
                 find_pd_for_asid_lookup_pd_wp
            | wpc
            | simp add: valid_arch_inv_def valid_page_inv_def
            | (simp add: cte_wp_at_caps_of_state,
                wp create_mapping_entries_same_refs_ex hoare_vcg_ex_lift_R))+)[1]
     apply (clarsimp simp: valid_cap_def cap_aligned_def neq_Nil_conv)
     apply (frule diminished_cte_wp_at_valid_cap[where p="(a, b)" for a b], clarsimp)
     apply (clarsimp simp: cte_wp_at_caps_of_state mask_cap_def
                           diminished_def[where cap="ArchObjectCap (PageCap d x y z w)" for d x y z w])
     apply (clarsimp simp: cap_rights_update_def acap_rights_update_def
                    split: cap.splits arch_cap.splits)
     apply (cases slot, auto simp: vmsz_aligned_def mask_def
                       valid_arch_caps_def cte_wp_at_caps_of_state
                       neq_Nil_conv invs_def valid_state_def data_at_def
                       valid_cap_def cap_aligned_def ord_eq_le_trans[OF pd_bits_14]
                 elim: is_aligned_weaken
                split: if_splits
               intro!: is_aligned_addrFromPPtr pbfs_atleast_pageBits,
            fastforce+)[1]
    apply (cases "invocation_type label = ArchInvocationLabel ARMPageUnmap")
     apply (simp split del: if_split)
     apply (rule hoare_pre, wp)
     apply (clarsimp simp: valid_arch_inv_def valid_page_inv_def)
     apply (thin_tac "Ball S P" for S P)
     apply (rule conjI)
      apply (clarsimp split: option.split)
      apply (clarsimp simp: valid_cap_def cap_aligned_def)
      apply (simp add: valid_unmap_def)
      apply (fastforce simp: vmsz_aligned_def elim: is_aligned_weaken intro!: pbfs_atleast_pageBits)
     apply (erule cte_wp_at_weakenE)
     apply (clarsimp simp: is_arch_diminished_def is_cap_simps)
    apply (cases "isPageFlushLabel (invocation_type label)")
     apply (simp split del: if_split)
     apply (rule hoare_pre)
      apply (wp whenE_throwError_wp static_imp_wp hoare_drop_imps)
        apply (simp add: valid_arch_inv_def valid_page_inv_def)
        apply (wp find_pd_for_asid_pd_at_asid | wpc)+
     apply (clarsimp simp: valid_cap_def mask_def)
    apply (simp split del: if_split)
    apply (cases "invocation_type label = ArchInvocationLabel ARMPageGetAddress")
     apply (simp split del: if_split)
     apply (rule hoare_pre, wp)
     apply (clarsimp simp: valid_arch_inv_def valid_page_inv_def)
    apply (rule hoare_pre, wp)
   apply (simp)
   apply (simp add: arch_decode_invocation_def Let_def split_def
                    is_final_cap_def
               cong: if_cong split del: if_split)
   apply (rename_tac word option)
   apply (rule hoare_pre)
    apply ((wp whenE_throwError_wp check_vp_wpR get_master_pde_wp hoare_vcg_all_lift_R|
            wpc|
            simp add: valid_arch_inv_def valid_pti_def unlessE_whenE vs_cap_ref_def|

            rule_tac x="fst p" in hoare_imp_eq_substR|
            wp_once hoare_vcg_ex_lift_R)+)[1]

         apply (rule_tac Q'="\<lambda>a b. ko_at (ArchObj (PageDirectory pd))
                                    (a + (args ! 0 >> 20 << 2) && ~~ mask pd_bits) b \<longrightarrow>
                                    pd (ucast (a + (args ! 0 >> 20 << 2) && mask pd_bits >> 2)) =
                                    InvalidPDE \<longrightarrow> L word option p pd a b" for L in hoare_post_imp_R[rotated])
          apply (intro impI)
          apply (erule impE)
           apply clarsimp
          apply (erule impE)
           apply (clarsimp split:pde.splits)
          apply assumption
         apply ((wp whenE_throwError_wp hoare_vcg_all_lift_R
                    find_pd_for_asid_lookup_slot [unfolded lookup_pd_slot_def Let_def]
                    find_pd_for_asid_ref_offset_voodoo find_pd_for_asid_shifting_voodoo
                    find_pd_for_asid_inv|
                 wpc|
                 simp add: valid_arch_inv_def valid_pti_def unlessE_whenE empty_pde_atI
                           vs_cap_ref_def if_apply_def2|
                 wp_once hoare_drop_imps hoare_vcg_ex_lift_R)+)[6]
   apply (clarsimp simp: is_cap_simps if_apply_def2)
   apply (rule conjI)
    apply clarsimp
    apply (rule conjI, fastforce)
    apply (rule conjI, fastforce)
    apply (clarsimp simp: neq_Nil_conv)
    apply (thin_tac "Ball S P" for S P)
    apply (rule conjI)
     apply (clarsimp simp: valid_cap_def cap_aligned_def)
    apply (rule conjI)
     apply (drule cte_wp_at_norm, clarsimp, drule cte_wp_valid_cap, fastforce)+
     apply (drule (1) diminished_is_update[rotated])+
     apply (clarsimp simp add: cap_rights_update_def acap_rights_update_def)
     apply (clarsimp simp: valid_cap_def cap_aligned_def
                           pt_bits_def pageBits_def
                           linorder_not_le
                           order_le_less_trans[OF word_and_le2])
    apply (rule conjI)
     apply (clarsimp simp add: cte_wp_at_caps_of_state)
     apply (drule (1) caps_of_state_valid[rotated])
     apply (drule (1) diminished_is_update)
     apply clarsimp
     apply (clarsimp simp: cap_master_cap_def is_arch_update_def)
     apply (clarsimp simp: cap_asid_def cap_rights_update_def acap_rights_update_def is_cap_simps
                    split: option.split)
    apply (rule conjI, fastforce)
    apply (rule conjI, fastforce)
    apply (clarsimp simp: pde_ref_def)
    apply (frule invs_pd_caps)
    apply (clarsimp simp: cte_wp_at_caps_of_state)
    apply (frule (1) caps_of_state_valid[rotated])
    apply (drule (1) diminished_is_update)
    apply (clarsimp simp: cap_rights_update_def acap_rights_update_def valid_cap_def)
    apply (drule (2) valid_table_caps_ptD)
    apply (rule conjI, fastforce simp:)+
    apply (clarsimp simp: kernel_vsrefs_def)
    apply (simp add: linorder_not_le, drule minus_one_helper3)
    apply (drule le_shiftr[where n=20], drule(1) order_trans)
    apply (simp add: kernel_base_def)
   apply (simp add: valid_arch_inv_def valid_pti_def)
   apply (clarsimp simp: cte_wp_at_def is_arch_diminished_def is_cap_simps)
  apply (simp add: arch_decode_invocation_def Let_def  split del: if_split)
  apply (cases "isPDFlushLabel (invocation_type label)")
   apply (simp split del: if_split)
   apply (rule hoare_pre)
    apply (wp whenE_throwError_wp static_imp_wp hoare_drop_imp | wpc | simp)+
          apply (simp add: resolve_vaddr_def)
          apply (wp get_master_pte_wp get_master_pde_wp whenE_throwError_wp | wpc | simp)+
        apply (clarsimp simp: valid_arch_inv_def valid_pdi_def)+
        apply (rule_tac Q'="\<lambda>pd' s. vspace_at_asid x2 pd' s \<and> x2 \<le> mask asid_bits \<and> x2 \<noteq> 0" in hoare_post_imp_R)
         apply wp
        apply clarsimp
       apply (wp | wpc)+
   apply (clarsimp simp: valid_cap_def mask_def)
  apply (clarsimp, wp throwError_validE_R)
  done


declare word_less_sub_le [simp]

crunch pred_tcb_at: perform_page_table_invocation, perform_page_invocation,
           perform_asid_pool_invocation, perform_page_directory_invocation "pred_tcb_at proj P t"
  (wp: crunch_wps simp: crunch_simps)


lemma arch_pinv_st_tcb_at:
  "\<lbrace>invs and valid_arch_inv ai and ct_active and
    st_tcb_at (P and (Not \<circ> inactive) and (Not \<circ> idle)) t\<rbrace>
     arch_perform_invocation ai
   \<lbrace>\<lambda>rv. st_tcb_at P t\<rbrace>"
  apply (cases ai, simp_all add: arch_perform_invocation_def valid_arch_inv_def)
     apply (wp perform_page_table_invocation_pred_tcb_at,
            fastforce elim!: pred_tcb_weakenE)
     apply (wp perform_page_directory_invocation_pred_tcb_at, fastforce elim: pred_tcb_weakenE)
    apply (wp perform_page_invocation_pred_tcb_at, fastforce elim!: pred_tcb_weakenE)
   apply (wp perform_asid_control_invocation_st_tcb_at,
          fastforce elim!: pred_tcb_weakenE)
  apply (wp perform_asid_pool_invocation_pred_tcb_at,
         fastforce elim!: pred_tcb_weakenE)
  done


lemma get_cap_diminished:
  "\<lbrace>valid_objs\<rbrace> get_cap slot \<lbrace>\<lambda>cap. cte_wp_at (diminished cap) slot\<rbrace>"
  apply (wp get_cap_wp)
  apply (intro allI impI)
  apply (simp add: cte_wp_at_caps_of_state diminished_def)
  apply (frule (1) caps_of_state_valid_cap)
  apply (clarsimp simp add: valid_cap_def2 wellformed_cap_def mask_cap_def
             cap_rights_update_def acap_rights_update_def
           split: cap.splits arch_cap.splits)
    apply fastforce+
  apply (clarsimp simp add: wellformed_acap_def
           split: cap.splits arch_cap.splits)
  apply (rename_tac rights vmpage_size option)
  apply (rule_tac x=rights in exI)
  apply auto
  done

end


context begin interpretation Arch .

requalify_consts
  valid_arch_inv

requalify_facts
  invoke_arch_tcb
  invoke_arch_invs
  sts_valid_arch_inv
  arch_decode_inv_wf
  arch_pinv_st_tcb_at
  get_cap_diminished

end

declare invoke_arch_invs[wp]
declare arch_decode_inv_wf[wp]


end
