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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 Sparc/64) --
9 -- --
10 -- Copyright (C) 1992-2012, 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 ------------------------------------------------------------------------------
37 package 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).
43 type Name is (SYSTEM_NAME_GNAT);
44 System_Name : constant Name := SYSTEM_NAME_GNAT;
46 -- System-Dependent Named Numbers
48 Min_Int : constant := Long_Long_Integer'First;
49 Max_Int : constant := Long_Long_Integer'Last;
51 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
52 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
54 Max_Base_Digits : constant := Long_Long_Float'Digits;
55 Max_Digits : constant := Long_Long_Float'Digits;
57 Max_Mantissa : constant := 63;
58 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
60 Tick : constant := 1.0 / 60.0;
62 -- Storage-related Declarations
64 -- VxWorks for UltraSparc uses 64bit words but 32bit pointers
66 type Address is private;
67 pragma Preelaborable_Initialization (Address);
68 Null_Address : constant Address;
70 Storage_Unit : constant := 8;
71 Word_Size : constant := 64;
72 Memory_Size : constant := 2 ** 32;
74 -- Address comparison
76 function "<" (Left, Right : Address) return Boolean;
77 function "<=" (Left, Right : Address) return Boolean;
78 function ">" (Left, Right : Address) return Boolean;
79 function ">=" (Left, Right : Address) return Boolean;
80 function "=" (Left, Right : Address) return Boolean;
82 pragma Import (Intrinsic, "<");
83 pragma Import (Intrinsic, "<=");
84 pragma Import (Intrinsic, ">");
85 pragma Import (Intrinsic, ">=");
86 pragma Import (Intrinsic, "=");
88 -- Other System-Dependent Declarations
90 type Bit_Order is (High_Order_First, Low_Order_First);
91 Default_Bit_Order : constant Bit_Order := High_Order_First;
92 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
94 -- Priority-related Declarations (RM D.1)
96 -- Ada priorities are mapped to VxWorks priorities using the following
97 -- transformation: 255 - Ada Priority
99 -- Ada priorities are used as follows:
101 -- 256 is reserved for the VxWorks kernel
102 -- 248 - 255 correspond to hardware interrupt levels 0 .. 7
103 -- 247 is a catchall default "interrupt" priority for signals,
104 -- allowing higher priority than normal tasks, but lower than
105 -- hardware priority levels. Protected Object ceilings can
106 -- override these values.
107 -- 246 is used by the Interrupt_Manager task
109 Max_Priority : constant Positive := 245;
110 Max_Interrupt_Priority : constant Positive := 255;
112 subtype Any_Priority is Integer range 0 .. 255;
113 subtype Priority is Any_Priority range 0 .. 245;
114 subtype Interrupt_Priority is Any_Priority range 246 .. 255;
116 Default_Priority : constant Priority := 122;
118 private
120 type Address is mod Memory_Size;
121 Null_Address : constant Address := 0;
123 --------------------------------------
124 -- System Implementation Parameters --
125 --------------------------------------
127 -- These parameters provide information about the target that is used
128 -- by the compiler. They are in the private part of System, where they
129 -- can be accessed using the special circuitry in the Targparm unit
130 -- whose source should be consulted for more detailed descriptions
131 -- of the individual switch values.
133 Backend_Divide_Checks : constant Boolean := False;
134 Backend_Overflow_Checks : constant Boolean := True;
135 Command_Line_Args : constant Boolean := False;
136 Configurable_Run_Time : constant Boolean := False;
137 Denorm : constant Boolean := True;
138 Duration_32_Bits : constant Boolean := False;
139 Exit_Status_Supported : constant Boolean := True;
140 Fractional_Fixed_Ops : constant Boolean := False;
141 Frontend_Layout : constant Boolean := False;
142 Machine_Overflows : constant Boolean := False;
143 Machine_Rounds : constant Boolean := True;
144 Preallocated_Stacks : constant Boolean := False;
145 Signed_Zeros : constant Boolean := True;
146 Stack_Check_Default : constant Boolean := False;
147 Stack_Check_Probes : constant Boolean := False;
148 Stack_Check_Limits : constant Boolean := True;
149 Support_Aggregates : constant Boolean := True;
150 Support_Composite_Assign : constant Boolean := True;
151 Support_Composite_Compare : constant Boolean := True;
152 Support_Long_Shifts : constant Boolean := True;
153 Always_Compatible_Rep : constant Boolean := False;
154 Suppress_Standard_Library : constant Boolean := False;
155 Use_Ada_Main_Program_Name : constant Boolean := True;
156 ZCX_By_Default : constant Boolean := False;
158 end System;