1------------------------------------------------------------------------------
2--                                                                          --
3--                        GNAT RUN-TIME COMPONENTS                          --
4--                                                                          --
5--                               S Y S T E M                                --
6--                                                                          --
7--                                 S p e c                                  --
8--                   (VxWorks/HIE Ravenscar Version PPC)                    --
9--                                                                          --
10--          Copyright (C) 1992-2018, 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
37--  This is a Ravenscar VxWorks version of this package for PowerPC targets
38
39pragma Restrictions (No_Exception_Propagation);
40--  Only local exception handling is supported in this profile
41
42pragma Restrictions (No_Exception_Registration);
43--  Disable exception name registration. This capability is not used because
44--  it is only required by exception stream attributes which are not supported
45--  in this run time.
46
47pragma Restrictions (No_Implicit_Dynamic_Code);
48--  Pointers to nested subprograms are not allowed in this run time, in order
49--  to prevent the compiler from building "trampolines".
50
51pragma Restrictions (No_Finalization);
52--  Controlled types are not supported in this run time
53
54pragma Profile (Ravenscar);
55--  This is a Ravenscar run time
56
57pragma Discard_Names;
58--  Disable explicitly the generation of names associated with entities in
59--  order to reduce the amount of storage used. These names are not used anyway
60--  (attributes such as 'Image and 'Value are not supported in this run time).
61
62package System is
63   pragma Pure;
64   --  Note that we take advantage of the implementation permission to make
65   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
66   --  2005, this is Pure in any case (AI-362).
67
68   pragma No_Elaboration_Code_All;
69   --  Allow the use of that restriction in units that WITH this unit
70
71   type Name is (SYSTEM_NAME_GNAT);
72   System_Name : constant Name := SYSTEM_NAME_GNAT;
73
74   --  System-Dependent Named Numbers
75
76   Min_Int               : constant := Long_Long_Integer'First;
77   Max_Int               : constant := Long_Long_Integer'Last;
78
79   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
80   Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
81
82   Max_Base_Digits       : constant := Long_Long_Float'Digits;
83   Max_Digits            : constant := Long_Long_Float'Digits;
84
85   Max_Mantissa          : constant := 63;
86   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
87
88   Tick                  : constant := 1.0 / 60.0;
89
90   --  Storage-related Declarations
91
92   type Address is private;
93   pragma Preelaborable_Initialization (Address);
94   Null_Address : constant Address;
95
96   Storage_Unit : constant := 8;
97   Word_Size    : constant := 32;
98   Memory_Size  : constant := 2 ** 32;
99
100   --  Address comparison
101
102   function "<"  (Left, Right : Address) return Boolean;
103   function "<=" (Left, Right : Address) return Boolean;
104   function ">"  (Left, Right : Address) return Boolean;
105   function ">=" (Left, Right : Address) return Boolean;
106   function "="  (Left, Right : Address) return Boolean;
107
108   pragma Import (Intrinsic, "<");
109   pragma Import (Intrinsic, "<=");
110   pragma Import (Intrinsic, ">");
111   pragma Import (Intrinsic, ">=");
112   pragma Import (Intrinsic, "=");
113
114   --  Other System-Dependent Declarations
115
116   type Bit_Order is (High_Order_First, Low_Order_First);
117   Default_Bit_Order : constant Bit_Order := High_Order_First;
118   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
119
120   --  Priority-related Declarations (RM D.1)
121
122   --  Ada priorities are mapped to VxWorks priorities using the following
123   --  transformation: 255 - Ada Priority
124
125   --  Ada priorities are used as follows:
126
127   --  256        is reserved for the VxWorks kernel
128   --  248 - 255  correspond to hardware interrupt levels 0 .. 7
129   --  247        is a catchall default "interrupt" priority for signals,
130   --             allowing higher priority than normal tasks, but lower than
131   --             hardware priority levels.  Protected Object ceilings can
132   --             override these values.
133   --  246        is used by the Interrupt_Manager task
134
135   Max_Priority           : constant Positive := 245;
136   Max_Interrupt_Priority : constant Positive := 255;
137
138   subtype Any_Priority       is Integer      range   0 .. 255;
139   subtype Priority           is Any_Priority range   0 .. 245;
140   subtype Interrupt_Priority is Any_Priority range 246 .. 255;
141
142   Default_Priority : constant Priority := 122;
143
144private
145
146   type Address is mod Memory_Size;
147   Null_Address : constant Address := 0;
148
149   --------------------------------------
150   -- System Implementation Parameters --
151   --------------------------------------
152
153   --  These parameters provide information about the target that is used
154   --  by the compiler. They are in the private part of System, where they
155   --  can be accessed using the special circuitry in the Targparm unit
156   --  whose source should be consulted for more detailed descriptions
157   --  of the individual switch values.
158
159   Backend_Divide_Checks     : constant Boolean := False;
160   Backend_Overflow_Checks   : constant Boolean := True;
161   Command_Line_Args         : constant Boolean := False;
162   Configurable_Run_Time     : constant Boolean := True;
163   Denorm                    : constant Boolean := True;
164   Duration_32_Bits          : constant Boolean := True;
165   Exit_Status_Supported     : constant Boolean := True;
166   Fractional_Fixed_Ops      : constant Boolean := False;
167   Frontend_Layout           : constant Boolean := False;
168   Machine_Overflows         : constant Boolean := True;
169   Machine_Rounds            : constant Boolean := True;
170   Preallocated_Stacks       : constant Boolean := False;
171   Signed_Zeros              : constant Boolean := True;
172   Stack_Check_Default       : constant Boolean := False;
173   Stack_Check_Probes        : constant Boolean := False;
174   Stack_Check_Limits        : constant Boolean := True;
175   Support_Aggregates        : constant Boolean := True;
176   Support_Composite_Assign  : constant Boolean := True;
177   Support_Composite_Compare : constant Boolean := True;
178   Support_Long_Shifts       : constant Boolean := True;
179   Always_Compatible_Rep     : constant Boolean := True;
180   Suppress_Standard_Library : constant Boolean := True;
181   Use_Ada_Main_Program_Name : constant Boolean := True;
182   Frontend_Exceptions       : constant Boolean := True;
183   ZCX_By_Default            : constant Boolean := False;
184
185   Executable_Extension : constant String := ".out";
186
187end System;
188