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------------------------------------------------------------------------------

--                                                                          --

--                        GNAT RUN-TIME COMPONENTS                          --

--                                                                          --

--                               S Y S T E M                                --

--                                                                          --

--                                 S p e c                                  --

--                            (Compiler Version)                            --

--                                                                          --

--          Copyright (C) 1992-2009 Free Software Foundation, Inc.          --

--                                                                          --

-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT. The copyright notice above, and the license provisions that follow --

-- apply solely to the  contents of the part following the private keyword. --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  This version of System is a RTEMS version that is used in building

--  the compiler.  This is based as closely as possible on the generic

--  version with the following exceptions:

--      + priority definitions

package System is

   pragma Pure;

   --  Note that we take advantage of the implementation permission to make

   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada

   --  2005, this is Pure in any case (AI-362).

   type Name is (SYSTEM_NAME_GNAT);

   System_Name : constant Name := SYSTEM_NAME_GNAT;

   --  System-Dependent Named Numbers

   Min_Int               : constant := Long_Long_Integer'First;

   Max_Int               : constant := Long_Long_Integer'Last;

   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;

   Max_Nonbinary_Modulus : constant := Integer'Last;

   Max_Base_Digits       : constant := Long_Long_Float'Digits;

   Max_Digits            : constant := Long_Long_Float'Digits;

   Max_Mantissa          : constant := 63;

   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);

   Tick                  : constant := 0.01;

   --  Storage-related Declarations

   type Address is private;

   Null_Address : constant Address;

   Storage_Unit : constant := Standard'Storage_Unit;

   Word_Size    : constant := Standard'Word_Size;

   Memory_Size  : constant := 2 ** Standard'Address_Size;

   --  Address comparison

   function "<"  (Left, Right : Address) return Boolean;

   function "<=" (Left, Right : Address) return Boolean;

   function ">"  (Left, Right : Address) return Boolean;

   function ">=" (Left, Right : Address) return Boolean;

   function "="  (Left, Right : Address) return Boolean;

   pragma Import (Intrinsic, "<");

   pragma Import (Intrinsic, "<=");

   pragma Import (Intrinsic, ">");

   pragma Import (Intrinsic, ">=");

   pragma Import (Intrinsic, "=");

   --  Other System-Dependent Declarations

   type Bit_Order is (High_Order_First, Low_Order_First);

   Default_Bit_Order : constant Bit_Order :=

                         Bit_Order'Val (Standard'Default_Bit_Order);

   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning

   --  Priority-related Declarations (RM D.1)

   --  RTEMS POSIX threads support 256 priority levels with 255 being

   --  logically the most important. Levels 0 and 255 are reserved.

   --

   --  255        is reserved for RTEMS system tasks

   --  247 - 254  correspond to hardware interrupt levels 0 .. 7

   --  246        is a catchall default "interrupt" priority for signals,

   --             allowing higher priority than normal tasks, but lower than

   --             hardware priority levels.  Protected Object ceilings can

   --             override these values.

   --  245        is used by the Interrupt_Manager task

   --  0          is reserved for the RTEMS IDLE task and really should not

   --             be accessible from Ada but GNAT initializes

   --             Current_Priority to 0 so it must be valid

   Max_Priority           : constant Positive := 244;

   Max_Interrupt_Priority : constant Positive := 254;

   subtype Any_Priority       is Integer      range   0 .. 254;

   subtype Priority           is Any_Priority range   0 .. 244;

   subtype Interrupt_Priority is Any_Priority range 245 .. 254;

   Default_Priority : constant Priority := 122;

private

   type Address is mod Memory_Size;

   Null_Address : constant Address := 0;

   --------------------------------------

   -- System Implementation Parameters --

   --------------------------------------

   --  These parameters provide information about the target that is used

   --  by the compiler. They are in the private part of System, where they

   --  can be accessed using the special circuitry in the Targparm unit

   --  whose source should be consulted for more detailed descriptions

   --  of the individual switch values.

   Backend_Divide_Checks     : constant Boolean := False;

   Backend_Overflow_Checks   : constant Boolean := False;

   Command_Line_Args         : constant Boolean := True;

   Configurable_Run_Time     : constant Boolean := False;

   Denorm                    : constant Boolean := True;

   Duration_32_Bits          : constant Boolean := False;

   Exit_Status_Supported     : constant Boolean := True;

   Fractional_Fixed_Ops      : constant Boolean := False;

   Frontend_Layout           : constant Boolean := False;

   Machine_Overflows         : constant Boolean := False;

   Machine_Rounds            : constant Boolean := True;

   Preallocated_Stacks       : constant Boolean := False;

   Signed_Zeros              : constant Boolean := True;

   Stack_Check_Default       : constant Boolean := False;

   Stack_Check_Probes        : constant Boolean := False;

   Stack_Check_Limits        : constant Boolean := False;

   Support_64_Bit_Divides    : constant Boolean := True;

   Support_Aggregates        : constant Boolean := True;

   Support_Composite_Assign  : constant Boolean := True;

   Support_Composite_Compare : constant Boolean := True;

   Support_Long_Shifts       : constant Boolean := True;

   Always_Compatible_Rep     : constant Boolean := True;

   Suppress_Standard_Library : constant Boolean := False;

   Use_Ada_Main_Program_Name : constant Boolean := False;

   ZCX_By_Default            : constant Boolean := False;

   GCC_ZCX_Support           : constant Boolean := True;

end System;