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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                         (VxWorks Version Xscale)                         --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2003 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- This specification is derived from the Ada Reference Manual for use with --
  13 -- GNAT. The copyright notice above, and the license provisions that follow --
  14 -- apply solely to the  contents of the part following the private keyword. --
  15 --                                                                          --
  16 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  17 -- terms of the  GNU General Public License as published  by the Free Soft- --
  18 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  19 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  20 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  21 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  22 -- for  more details.  You should have  received  a copy of the GNU General --
  23 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  24 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  25 -- MA 02111-1307, USA.                                                      --
  26 --                                                                          --
  27 -- As a special exception,  if other files  instantiate  generics from this --
  28 -- unit, or you link  this unit with other files  to produce an executable, --
  29 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  30 -- covered  by the  GNU  General  Public  License.  This exception does not --
  31 -- however invalidate  any other reasons why  the executable file  might be --
  32 -- covered by the  GNU Public License.                                      --
  33 --                                                                          --
  34 -- GNAT was originally developed  by the GNAT team at  New York University. --
  35 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  36 --                                                                          --
  37 ------------------------------------------------------------------------------
  38
  39 package System is
  40 pragma Pure (System);
  41 --  Note that we take advantage of the implementation permission to
  42 --  make this unit Pure instead of Preelaborable, see RM 13.7(36)
  43
  44    type Name is (SYSTEM_NAME_GNAT);
  45    System_Name : constant Name := SYSTEM_NAME_GNAT;
  46
  47    --  System-Dependent Named Numbers
  48
  49    Min_Int               : constant := Long_Long_Integer'First;
  50    Max_Int               : constant := Long_Long_Integer'Last;
  51
  52    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  53    Max_Nonbinary_Modulus : constant := Integer'Last;
  54
  55    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  56    Max_Digits            : constant := Long_Long_Float'Digits;
  57
  58    Max_Mantissa          : constant := 63;
  59    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  60
  61    Tick                  : constant := 1.0 / 60.0;
  62
  63    --  Storage-related Declarations
  64
  65    type Address is private;
  66    Null_Address : constant Address;
  67
  68    Storage_Unit : constant := 8;
  69    Word_Size    : constant := 32;
  70    Memory_Size  : constant := 2 ** 32;
  71
  72    --  Address comparison
  73
  74    function "<"  (Left, Right : Address) return Boolean;
  75    function "<=" (Left, Right : Address) return Boolean;
  76    function ">"  (Left, Right : Address) return Boolean;
  77    function ">=" (Left, Right : Address) return Boolean;
  78    function "="  (Left, Right : Address) return Boolean;
  79
  80    pragma Import (Intrinsic, "<");
  81    pragma Import (Intrinsic, "<=");
  82    pragma Import (Intrinsic, ">");
  83    pragma Import (Intrinsic, ">=");
  84    pragma Import (Intrinsic, "=");
  85
  86    --  Other System-Dependent Declarations
  87
  88    type Bit_Order is (High_Order_First, Low_Order_First);
  89    Default_Bit_Order : constant Bit_Order := Low_Order_First;
  90
  91    --  Priority-related Declarations (RM D.1)
  92
  93    --  256        is reserved for the VxWorks kernel
  94    --  248 - 255  correspond to hardware interrupt levels 0 .. 7
  95    --  247        is a catchall default "interrupt" priority for signals,
  96    --             allowing higher priority than normal tasks, but lower than
  97    --             hardware priority levels.  Protected Object ceilings can
  98    --             override these values.
  99    --  246        is used by the Interrupt_Manager task
 100
 101    Max_Priority           : constant Positive := 245;
 102    Max_Interrupt_Priority : constant Positive := 255;
 103
 104    subtype Any_Priority       is Integer      range   0 .. 255;
 105    subtype Priority           is Any_Priority range   0 .. 245;
 106    subtype Interrupt_Priority is Any_Priority range 246 .. 255;
 107
 108    Default_Priority : constant Priority := 122;
 109
 110 private
 111
 112    type Address is mod Memory_Size;
 113    Null_Address : constant Address := 0;
 114
 115    --------------------------------------
 116    -- System Implementation Parameters --
 117    --------------------------------------
 118
 119    --  These parameters provide information about the target that is used
 120    --  by the compiler. They are in the private part of System, where they
 121    --  can be accessed using the special circuitry in the Targparm unit
 122    --  whose source should be consulted for more detailed descriptions
 123    --  of the individual switch values.
 124
 125    AAMP                      : constant Boolean := False;
 126    Backend_Divide_Checks     : constant Boolean := False;
 127    Backend_Overflow_Checks   : constant Boolean := False;
 128    Command_Line_Args         : constant Boolean := False;
 129    Configurable_Run_Time     : constant Boolean := False;
 130    Denorm                    : constant Boolean := True;
 131    Duration_32_Bits          : constant Boolean := False;
 132    Exit_Status_Supported     : constant Boolean := True;
 133    Fractional_Fixed_Ops      : constant Boolean := False;
 134    Frontend_Layout           : constant Boolean := False;
 135    Functions_Return_By_DSP   : constant Boolean := False;
 136    Machine_Overflows         : constant Boolean := False;
 137    Machine_Rounds            : constant Boolean := True;
 138    OpenVMS                   : constant Boolean := False;
 139    Signed_Zeros              : constant Boolean := True;
 140    Stack_Check_Default       : constant Boolean := False;
 141    Stack_Check_Probes        : constant Boolean := False;
 142    Support_64_Bit_Divides    : constant Boolean := True;
 143    Support_Aggregates        : constant Boolean := True;
 144    Support_Composite_Assign  : constant Boolean := True;
 145    Support_Composite_Compare : constant Boolean := True;
 146    Support_Long_Shifts       : constant Boolean := True;
 147    Suppress_Standard_Library : constant Boolean := False;
 148    Use_Ada_Main_Program_Name : constant Boolean := True;
 149    ZCX_By_Default            : constant Boolean := False;
 150    GCC_ZCX_Support           : constant Boolean := False;
 151    Front_End_ZCX_Support     : constant Boolean := False;
 152
 153    --  Obsolete entries, to be removed eventually (bootstrap issues!)
 154
 155    High_Integrity_Mode       : constant Boolean := False;
 156    Long_Shifts_Inlined       : constant Boolean := False;
 157
 158 end System;