1------------------------------------------------------------------------------
2--                                                                          --
3--                        GNAT RUN-TIME COMPONENTS                          --
4--                                                                          --
5--                               S Y S T E M                                --
6--                                                                          --
7--                                 S p e c                                  --
8--                          (VxWorks Version ARM)                           --
9--                                                                          --
10--          Copyright (C) 1992-2014, 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 3,  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.                                     --
22--                                                                          --
23-- As a special exception under Section 7 of GPL version 3, you are granted --
24-- additional permissions described in the GCC Runtime Library Exception,   --
25-- version 3.1, as published by the Free Software Foundation.               --
26--                                                                          --
27-- You should have received a copy of the GNU General Public License and    --
28-- a copy of the GCC Runtime Library Exception along with this program;     --
29-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
30-- <http://www.gnu.org/licenses/>.                                          --
31--                                                                          --
32-- GNAT was originally developed  by the GNAT team at  New York University. --
33-- Extensive contributions were provided by Ada Core Technologies Inc.      --
34--                                                                          --
35------------------------------------------------------------------------------
36
37package System is
38   pragma Pure;
39   --  Note that we take advantage of the implementation permission to make
40   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
41   --  2005, this is Pure in any case (AI-362).
42
43   type Name is (SYSTEM_NAME_GNAT);
44   System_Name : constant Name := SYSTEM_NAME_GNAT;
45
46   --  System-Dependent Named Numbers
47
48   Min_Int               : constant := Long_Long_Integer'First;
49   Max_Int               : constant := Long_Long_Integer'Last;
50
51   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
52   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
53
54   Max_Base_Digits       : constant := Long_Long_Float'Digits;
55   Max_Digits            : constant := Long_Long_Float'Digits;
56
57   Max_Mantissa          : constant := 63;
58   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
59
60   Tick                  : constant := 1.0 / 60.0;
61
62   --  Storage-related Declarations
63
64   type Address is private;
65   pragma Preelaborable_Initialization (Address);
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   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
91
92   --  Priority-related Declarations (RM D.1)
93
94   --  Ada priorities are mapped to VxWorks priorities using the following
95   --  transformation: 255 - Ada Priority
96
97   --  Ada priorities are used as follows:
98
99   --  256        is reserved for the VxWorks kernel
100   --  248 - 255  correspond to hardware interrupt levels 0 .. 7
101   --  247        is a catchall default "interrupt" priority for signals,
102   --             allowing higher priority than normal tasks, but lower than
103   --             hardware priority levels.  Protected Object ceilings can
104   --             override these values.
105   --  246        is used by the Interrupt_Manager task
106
107   Max_Priority           : constant Positive := 245;
108   Max_Interrupt_Priority : constant Positive := 255;
109
110   subtype Any_Priority       is Integer      range   0 .. 255;
111   subtype Priority           is Any_Priority range   0 .. 245;
112   subtype Interrupt_Priority is Any_Priority range 246 .. 255;
113
114   Default_Priority : constant Priority := 122;
115
116private
117
118   type Address is mod Memory_Size;
119   Null_Address : constant Address := 0;
120
121   --------------------------------------
122   -- System Implementation Parameters --
123   --------------------------------------
124
125   --  These parameters provide information about the target that is used
126   --  by the compiler. They are in the private part of System, where they
127   --  can be accessed using the special circuitry in the Targparm unit
128   --  whose source should be consulted for more detailed descriptions
129   --  of the individual switch values.
130
131   Backend_Divide_Checks     : constant Boolean := False;
132   Backend_Overflow_Checks   : constant Boolean := True;
133   Command_Line_Args         : constant Boolean := False;
134   Configurable_Run_Time     : constant Boolean := False;
135   Denorm                    : constant Boolean := True;
136   Duration_32_Bits          : constant Boolean := False;
137   Exit_Status_Supported     : constant Boolean := True;
138   Fractional_Fixed_Ops      : constant Boolean := False;
139   Frontend_Layout           : constant Boolean := False;
140   Machine_Overflows         : constant Boolean := False;
141   Machine_Rounds            : constant Boolean := True;
142   Preallocated_Stacks       : constant Boolean := False;
143   Signed_Zeros              : constant Boolean := True;
144   Stack_Check_Default       : constant Boolean := False;
145   Stack_Check_Probes        : constant Boolean := False;
146   Stack_Check_Limits        : constant Boolean := True;
147   Support_Aggregates        : constant Boolean := True;
148   Support_Composite_Assign  : constant Boolean := True;
149   Support_Composite_Compare : constant Boolean := True;
150   Support_Long_Shifts       : constant Boolean := True;
151   Always_Compatible_Rep     : constant Boolean := False;
152   Suppress_Standard_Library : constant Boolean := False;
153   Use_Ada_Main_Program_Name : constant Boolean := True;
154   ZCX_By_Default            : constant Boolean := False;
155
156end System;
157