diff --git a/base/modules/tools/psb_cd_tools_mod.f90 b/base/modules/tools/psb_cd_tools_mod.f90
new file mode 100644
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+++ b/base/modules/tools/psb_cd_tools_mod.f90
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+!   
+!                Parallel Sparse BLAS  version 3.5
+!      (C) Copyright 2006-2018
+!        Salvatore Filippone    
+!        Alfredo Buttari      
+!   
+!    Redistribution and use in source and binary forms, with or without
+!    modification, are permitted provided that the following conditions
+!    are met:
+!      1. Redistributions of source code must retain the above copyright
+!         notice, this list of conditions and the following disclaimer.
+!      2. Redistributions in binary form must reproduce the above copyright
+!         notice, this list of conditions, and the following disclaimer in the
+!         documentation and/or other materials provided with the distribution.
+!      3. The name of the PSBLAS group or the names of its contributors may
+!         not be used to endorse or promote products derived from this
+!         software without specific written permission.
+!   
+!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
+!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!    POSSIBILITY OF SUCH DAMAGE.
+!   
+!    
+module psb_cd_tools_mod
+
+  use psb_const_mod
+  use psb_desc_mod
+  use psb_gen_block_map_mod
+  use psb_list_map_mod
+  use psb_glist_map_mod
+  use psb_hash_map_mod
+  use psb_repl_map_mod
+    
+  interface psb_cd_set_bld
+    subroutine psb_cd_set_bld(desc,info)
+      import :: psb_ipk_, psb_desc_type
+      type(psb_desc_type), intent(inout) :: desc
+      integer(psb_ipk_) :: info
+    end subroutine psb_cd_set_bld
+  end interface
+
+  interface psb_cd_set_ovl_bld
+    subroutine psb_cd_set_ovl_bld(desc,info)
+      import :: psb_ipk_, psb_desc_type
+      type(psb_desc_type), intent(inout) :: desc
+      integer(psb_ipk_) :: info
+    end subroutine psb_cd_set_ovl_bld
+  end interface
+
+  interface psb_cd_reinit
+    Subroutine psb_cd_reinit(desc,info)
+      import :: psb_ipk_, psb_desc_type
+      Implicit None
+
+      !     .. Array Arguments ..
+      Type(psb_desc_type), Intent(inout) :: desc
+      integer(psb_ipk_), intent(out)               :: info
+    end Subroutine psb_cd_reinit
+  end interface
+
+  interface psb_cdcpy
+    subroutine psb_cdcpy(desc_in, desc_out, info)
+      import :: psb_ipk_, psb_desc_type
+
+      implicit none
+      !....parameters...
+
+      type(psb_desc_type), intent(inout) :: desc_in
+      type(psb_desc_type), intent(out)   :: desc_out
+      integer(psb_ipk_), intent(out)     :: info
+    end subroutine psb_cdcpy
+  end interface
+
+
+  interface psb_cdprt
+    subroutine psb_cdprt(iout,desc_p,glob,short,verbosity)
+      import :: psb_ipk_, psb_desc_type
+      implicit none 
+      type(psb_desc_type), intent(in)    :: desc_p
+      integer(psb_ipk_), intent(in)                :: iout
+      logical, intent(in), optional      :: glob,short
+      integer(psb_ipk_), intent(in), optional      :: verbosity
+    end subroutine psb_cdprt
+  end interface
+
+  interface psb_cdins
+    subroutine psb_cdinsrc(nz,ia,ja,desc_a,info,ila,jla)
+      import :: psb_ipk_, psb_lpk_, psb_desc_type
+      type(psb_desc_type), intent(inout) :: desc_a
+      integer(psb_ipk_), intent(in)                :: nz
+      integer(psb_lpk_), intent(in)                :: ia(:),ja(:)
+      integer(psb_ipk_), intent(out)               :: info
+      integer(psb_ipk_), optional, intent(out)     :: ila(:), jla(:)
+    end subroutine psb_cdinsrc
+    subroutine psb_cdinsc(nz,ja,desc,info,jla,mask,lidx)
+      import :: psb_ipk_, psb_lpk_, psb_desc_type
+      type(psb_desc_type), intent(inout)         :: desc
+      integer(psb_ipk_), intent(in)              :: nz
+      integer(psb_lpk_), intent(in)              :: ja(:)
+      integer(psb_ipk_), intent(out)             :: info
+      integer(psb_ipk_), optional, intent(out)   :: jla(:)
+      logical, optional, target, intent(in)      :: mask(:)
+      integer(psb_ipk_), intent(in), optional    :: lidx(:)
+    end subroutine psb_cdinsc
+  end interface
+
+  interface psb_cdbldext
+    Subroutine psb_cd_lstext(desc_a,in_list,desc_ov,info, mask,extype)
+      import :: psb_ipk_, psb_lpk_, psb_desc_type
+      Implicit None
+      Type(psb_desc_type), Intent(inout), target :: desc_a
+      integer(psb_lpk_), intent(in)                     :: in_list(:)
+      Type(psb_desc_type), Intent(out)        :: desc_ov
+      integer(psb_ipk_), intent(out)                    :: info
+      logical, intent(in), optional, target   :: mask(:)
+      integer(psb_ipk_), intent(in),optional            :: extype
+    end Subroutine psb_cd_lstext
+  end interface
+
+
+  interface psb_cdren
+    subroutine psb_cdren(trans,iperm,desc_a,info)
+      import :: psb_ipk_, psb_desc_type
+      type(psb_desc_type), intent(inout)    :: desc_a
+      integer(psb_ipk_), intent(inout)                :: iperm(:)
+      character, intent(in)                 :: trans
+      integer(psb_ipk_), intent(out)                  :: info
+    end subroutine psb_cdren
+  end interface
+
+  interface psb_get_overlap
+    subroutine psb_get_ovrlap(ovrel,desc,info)
+      import :: psb_ipk_, psb_desc_type
+      implicit none 
+      integer(psb_ipk_), allocatable, intent(out) :: ovrel(:)
+      type(psb_desc_type), intent(in) :: desc
+      integer(psb_ipk_), intent(out)            :: info
+    end subroutine psb_get_ovrlap
+  end interface
+
+  interface psb_icdasb
+    subroutine psb_icdasb(desc,info,ext_hv, mold)
+      import :: psb_ipk_, psb_desc_type, psb_i_base_vect_type
+      Type(psb_desc_type), intent(inout) :: desc
+      integer(psb_ipk_), intent(out)               :: info
+      logical, intent(in),optional       :: ext_hv
+      class(psb_i_base_vect_type), optional, intent(in) :: mold
+    end subroutine psb_icdasb
+  end interface
+
+  interface psb_cdall
+
+    subroutine psb_cdall(ictxt, desc, info,mg,ng,parts,vg,vl,flag,nl,repl,&
+         & globalcheck,lidx)
+      import :: psb_ipk_, psb_lpk_, psb_desc_type, psb_parts
+      implicit None
+      procedure(psb_parts)                :: parts
+      integer(psb_lpk_), intent(in)       :: mg,ng, vl(:)
+      integer(psb_ipk_), intent(in)       :: ictxt, vg(:), lidx(:),nl
+      integer(psb_ipk_), intent(in)       :: flag
+      logical, intent(in)                 :: repl, globalcheck
+      integer(psb_ipk_), intent(out)      :: info
+      type(psb_desc_type), intent(out)    :: desc      
+      optional :: mg,ng,parts,vg,vl,flag,nl,repl, globalcheck,lidx
+    end subroutine psb_cdall
+    
+  end interface
+
+  interface psb_cdasb
+    module procedure psb_cdasb
+  end interface
+
+  interface psb_get_boundary
+    module procedure psb_get_boundary
+  end interface
+
+  interface 
+    subroutine psb_cd_switch_ovl_indxmap(desc,info) 
+      import :: psb_ipk_, psb_desc_type
+      implicit None
+      type(psb_desc_type), intent(inout) :: desc
+      integer(psb_ipk_), intent(out)               :: info
+    end subroutine psb_cd_switch_ovl_indxmap
+  end interface
+
+  
+  interface psb_glob_to_loc
+    subroutine psb_glob_to_loc2v(x,y,desc_a,info,iact,owned)
+      import
+      implicit none
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_lpk_),intent(in)                 ::  x(:)  
+      integer(psb_ipk_),intent(out)                ::  y(:)  
+      integer(psb_ipk_), intent(out)               ::  info
+      logical, intent(in),  optional     :: owned
+      character, intent(in), optional    ::  iact
+    end subroutine psb_glob_to_loc2v
+    subroutine psb_glob_to_loc1v(x,desc_a,info,iact,owned)
+      import
+      implicit none
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_lpk_),intent(inout)              ::  x(:)  
+      integer(psb_ipk_), intent(out)               ::  info
+      logical, intent(in),  optional     :: owned
+      character, intent(in), optional    ::  iact
+    end subroutine psb_glob_to_loc1v
+    subroutine psb_glob_to_loc2s(x,y,desc_a,info,iact,owned)
+      import
+      implicit none 
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_lpk_),intent(in)                 ::  x
+      integer(psb_ipk_),intent(out)                ::  y  
+      integer(psb_ipk_), intent(out)               ::  info
+      character, intent(in), optional    ::  iact
+      logical, intent(in),  optional     :: owned
+    end subroutine psb_glob_to_loc2s
+    subroutine psb_glob_to_loc1s(x,desc_a,info,iact,owned)
+      import
+      implicit none 
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_lpk_),intent(inout)              ::  x  
+      integer(psb_ipk_), intent(out)               ::  info
+      character, intent(in), optional    ::  iact
+      logical, intent(in),  optional     :: owned
+    end subroutine psb_glob_to_loc1s
+  end interface
+
+  interface psb_loc_to_glob
+    subroutine psb_loc_to_glob2v(x,y,desc_a,info,iact)
+      import
+      implicit none
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_ipk_),intent(in)                 ::  x(:)  
+      integer(psb_lpk_),intent(out)                ::  y(:)  
+      integer(psb_ipk_), intent(out)               ::  info
+      character, intent(in), optional    ::  iact
+    end subroutine psb_loc_to_glob2v
+    subroutine psb_loc_to_glob1v(x,desc_a,info,iact)
+      import
+      implicit none
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_lpk_),intent(inout)              ::  x(:)  
+      integer(psb_ipk_), intent(out)               ::  info
+      character, intent(in), optional    ::  iact
+    end subroutine psb_loc_to_glob1v
+    subroutine psb_loc_to_glob2s(x,y,desc_a,info,iact)
+      import
+      implicit none 
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_ipk_),intent(in)                 ::  x
+      integer(psb_lpk_),intent(out)                ::  y  
+      integer(psb_ipk_), intent(out)               ::  info
+      character, intent(in), optional    ::  iact
+    end subroutine psb_loc_to_glob2s
+    subroutine psb_loc_to_glob1s(x,desc_a,info,iact)
+      import
+      implicit none
+      type(psb_desc_type), intent(in)    ::  desc_a
+      integer(psb_lpk_),intent(inout)              ::  x  
+      integer(psb_ipk_), intent(out)               ::  info
+      character, intent(in), optional    ::  iact
+    end subroutine psb_loc_to_glob1s
+
+  end interface
+
+
+  interface psb_is_owned
+    module procedure psb_is_owned
+  end interface
+
+  interface psb_is_local
+    module procedure psb_is_local
+  end interface
+
+  interface psb_owned_index
+    module procedure psb_owned_index, psb_owned_index_v
+  end interface
+
+  interface psb_local_index
+    module procedure psb_local_index, psb_local_index_v
+  end interface
+
+contains
+
+  subroutine psb_get_boundary(bndel,desc,info)
+    use psi_mod, only : psi_crea_bnd_elem
+    implicit none 
+    integer(psb_ipk_), allocatable, intent(out) :: bndel(:)
+    type(psb_desc_type), intent(in) :: desc
+    integer(psb_ipk_), intent(out)            :: info
+
+    call psi_crea_bnd_elem(bndel,desc,info)
+
+  end subroutine psb_get_boundary
+
+  subroutine psb_cdasb(desc,info,mold)
+
+    Type(psb_desc_type), intent(inout) :: desc
+    integer(psb_ipk_), intent(out)     :: info
+    class(psb_i_base_vect_type), optional, intent(in) :: mold
+
+    call psb_icdasb(desc,info,ext_hv=.false.,mold=mold)
+  end subroutine psb_cdasb
+  
+
+  function psb_is_owned(idx,desc)
+    implicit none 
+    integer(psb_lpk_), intent(in) :: idx
+    type(psb_desc_type), intent(in) :: desc
+    logical :: psb_is_owned
+    logical :: res
+    integer(psb_ipk_) :: info
+
+    call psb_owned_index(res,idx,desc,info)
+    if (info /= psb_success_) res=.false.
+    psb_is_owned = res
+  end function psb_is_owned
+
+  function psb_is_local(idx,desc)
+    implicit none 
+    integer(psb_lpk_), intent(in) :: idx
+    type(psb_desc_type), intent(in) :: desc
+    logical :: psb_is_local
+    logical :: res
+    integer(psb_ipk_) :: info
+
+    call psb_local_index(res,idx,desc,info)
+    if (info /= psb_success_) res=.false.
+    psb_is_local = res
+  end function psb_is_local
+
+  subroutine psb_owned_index(res,idx,desc,info)
+    implicit none 
+    integer(psb_lpk_), intent(in) :: idx
+    type(psb_desc_type), intent(in) :: desc
+    logical, intent(out) :: res
+    integer(psb_ipk_), intent(out) :: info
+
+    integer(psb_ipk_) :: lx
+
+    call psb_glob_to_loc(idx,lx,desc,info,iact='I',owned=.true.)
+
+    res = (lx>0)
+  end subroutine psb_owned_index
+
+  subroutine psb_owned_index_v(res,idx,desc,info)
+    implicit none 
+    integer(psb_lpk_), intent(in) :: idx(:)
+    type(psb_desc_type), intent(in) :: desc
+    logical, intent(out) :: res(:)
+    integer(psb_ipk_), intent(out) :: info
+    integer(psb_ipk_), allocatable  :: lx(:)
+
+    allocate(lx(size(idx)),stat=info)
+    res=.false.
+    if (info /= psb_success_) return
+    call psb_glob_to_loc(idx,lx,desc,info,iact='I',owned=.true.)
+
+    res = (lx>0)
+  end subroutine psb_owned_index_v
+
+  subroutine psb_local_index(res,idx,desc,info)
+    implicit none 
+    integer(psb_lpk_), intent(in) :: idx
+    type(psb_desc_type), intent(in) :: desc
+    logical, intent(out) :: res
+    integer(psb_ipk_), intent(out) :: info
+
+    integer(psb_ipk_) :: lx
+
+    call psb_glob_to_loc(idx,lx,desc,info,iact='I',owned=.false.)
+
+    res = (lx>0)
+  end subroutine psb_local_index
+
+  subroutine psb_local_index_v(res,idx,desc,info)
+    implicit none 
+    integer(psb_lpk_), intent(in) :: idx(:)
+    type(psb_desc_type), intent(in) :: desc
+    logical, intent(out) :: res(:)
+    integer(psb_ipk_), intent(out) :: info    
+    integer(psb_ipk_), allocatable  :: lx(:)
+
+    allocate(lx(size(idx)),stat=info)
+    res=.false.
+    if (info /= psb_success_) return
+    call psb_glob_to_loc(idx,lx,desc,info,iact='I',owned=.false.)
+
+    res = (lx>0)
+  end subroutine psb_local_index_v
+
+end module psb_cd_tools_mod
+
+