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diff --git a/src/grt/grt-analog_solver.ads b/src/grt/grt-analog_solver.ads
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+--  GHDL Run Time (GRT) -  analog solver.
+--  Copyright (C) 2022 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>.
+--
+--  As a special exception, if other files instantiate generics from this
+--  unit, or you link this unit with other files to produce an executable,
+--  this unit does not by itself cause the resulting executable to be
+--  covered by the GNU General Public License. This exception does not
+--  however invalidate any other reasons why the executable file might be
+--  covered by the GNU Public License.
+
+with Grt.Types; use Grt.Types;
+
+package Grt.Analog_Solver is
+   type F64_Array is array (Natural range <>) of Ghdl_F64;
+   subtype F64_Fat_Array is F64_Array (Natural);
+
+   --  A pointer to an F64 array.
+   type F64_C_Arr_Ptr is access all F64_Fat_Array;
+   pragma Convention (C, F64_C_Arr_Ptr);
+
+   --  Initialize the analog solver, SIZE is the number of scalar quantities.
+   procedure Init (Size : Ghdl_I32);
+
+   --  Return the address of the initial values vector and derivative vector.
+   function Get_Init_Val_Ptr return F64_C_Arr_Ptr;
+   function Get_Init_Der_Ptr return F64_C_Arr_Ptr;
+
+   --  Finish initialization.
+   procedure Start;
+
+   procedure Residues (T : Ghdl_F64;
+                       Y : F64_C_Arr_Ptr;
+                       Yp : F64_C_Arr_Ptr;
+                       Res : F64_C_Arr_Ptr);
+   pragma Import (C, Residues, "grt__analog_solver__residues");
+
+   procedure Set_Root_Size (Size : Ghdl_I32);
+
+   procedure Roots (T : Ghdl_F64;
+                    Y : F64_C_Arr_Ptr;
+                    Yp: F64_C_Arr_Ptr;
+                    Res : F64_C_Arr_Ptr);
+   pragma Import (C, Roots, "grt__analog_solver__roots");
+
+   procedure Set_Values (Y : F64_C_Arr_Ptr;
+                         Yp: F64_C_Arr_Ptr);
+   pragma Import (C, Set_Values, "grt__analog_solver__set_values");
+
+   --  Return status:
+   --  0: Ok, Tn reached
+   --  1: Stopped due to zero crossing
+   --  2: failure
+   procedure Solve (T : Ghdl_F64; Tn : in out Ghdl_F64; Res : out Integer);
+
+   procedure Finish;
+end Grt.Analog_Solver;