--  Memory segments.
--  Copyright (C) 2006 Tristan Gingold
--
--  GHDL is free software; you can redistribute it and/or modify it under
--  the terms of the GNU General Public License as published by the Free
--  Software Foundation; either version 2, or (at your option) any later
--  version.
--
--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
--  for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with GCC; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
package body Memsegs_Mmap is
   function Mmap_Malloc (Size : Natural) return Address;
   pragma Import (C, Mmap_Malloc, "mmap_malloc");

   function Mmap_Realloc (Ptr : Address; Old_Size : Natural; Size : Natural)
                         return Address;
   pragma Import (C, Mmap_Realloc, "mmap_realloc");

   procedure Mmap_Free (Ptr : Address; Size : Natural);
   pragma Import (C, Mmap_Free, "mmap_free");

   procedure Mmap_Rx (Ptr : Address; Size : Natural);
   pragma Import (C, Mmap_Rx, "mmap_rx");

   function Create return Memseg_Type is
   begin
      return (Base => Null_Address, Size => 0);
   end Create;

   procedure Resize (Seg : in out Memseg_Type; Size : Natural) is
   begin
      if Seg.Size = 0 then
         Seg.Base := Mmap_Malloc (Size);
      else
         Seg.Base := Mmap_Realloc (Seg.Base, Seg.Size, Size);
      end if;
      Seg.Size := Size;
   end Resize;

   function Get_Address (Seg : Memseg_Type) return Address is
   begin
      return Seg.Base;
   end Get_Address;

   procedure Delete (Seg : in out Memseg_Type) is
   begin
      Mmap_Free (Seg.Base, Seg.Size);
      Seg.Base := Null_Address;
      Seg.Size := 0;
   end Delete;

   procedure Set_Rx (Seg : in out Memseg_Type) is
   begin
      Mmap_Rx (Seg.Base, Seg.Size);
   end Set_Rx;
end Memsegs_Mmap;