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-- Memory segments.
-- Copyright (C) 2006 Tristan Gingold
--
-- This program 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 of the License, or
-- (at your option) any later version.
--
-- This program 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 this program. If not, see <gnu.org/licenses>.
with System.Storage_Elements;
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;
Offset : Natural; Size : Natural)
is
use System.Storage_Elements;
begin
Mmap_Rx (Seg.Base + Storage_Offset (Offset), Size);
end Set_Rx;
end Memsegs_Mmap;
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