File : system-vxworks-ppc-raven-mils.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M --
6 -- --
7 -- S p e c --
8 -- (VxWorks MILS Ravenscar-cert Version PPC) --
9 -- --
10 -- Copyright (C) 1992-2016, 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 -- --
24 -- --
25 -- --
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 -- Level A certifiable Ravenscar VxWorks MILS version
38
39 pragma Restrictions (No_Finalization);
40 -- Controlled types are not supported in this run time
41
42 pragma 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
47 pragma 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
51 pragma Restrictions (No_Use_Of_Pragma => Attach_Handler);
52 pragma Restrictions (No_Specification_Of_Aspect => Attach_Handler);
53 -- This pragma is not supported by the Ravenscar Cert profile
54
55 pragma Profile (Ravenscar);
56
57 package System is
58 pragma Pure;
59 -- Note that we take advantage of the implementation permission to make
60 -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
61 -- 2005, this is Pure in any case (AI-362).
62
63 pragma No_Elaboration_Code_All;
64 -- Allow the use of that restriction in units that WITH this unit
65
66 type Name is (SYSTEM_NAME_GNAT);
67 System_Name : constant Name := SYSTEM_NAME_GNAT;
68
69 -- System-Dependent Named Numbers
70
71 Min_Int : constant := Long_Long_Integer'First;
72 Max_Int : constant := Long_Long_Integer'Last;
73
74 Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size;
75 Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
76
77 Max_Base_Digits : constant := Long_Long_Float'Digits;
78 Max_Digits : constant := Long_Long_Float'Digits;
79
80 Max_Mantissa : constant := 63;
81 Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
82
83 Tick : constant := 1.0 / 60.0;
84
85 -- Storage-related Declarations
86
87 type Address is private;
88 pragma Preelaborable_Initialization (Address);
89 Null_Address : constant Address;
90
91 Storage_Unit : constant := 8;
92 Word_Size : constant := 32;
93 Memory_Size : constant := 2 ** 32;
94
95 -- Address comparison
96
97 function "<" (Left, Right : Address) return Boolean;
98 function "<=" (Left, Right : Address) return Boolean;
99 function ">" (Left, Right : Address) return Boolean;
100 function ">=" (Left, Right : Address) return Boolean;
101 function "=" (Left, Right : Address) return Boolean;
102
103 pragma Import (Intrinsic, "<");
104 pragma Import (Intrinsic, "<=");
105 pragma Import (Intrinsic, ">");
106 pragma Import (Intrinsic, ">=");
107 pragma Import (Intrinsic, "=");
108
109 -- Other System-Dependent Declarations
110
111 type Bit_Order is (High_Order_First, Low_Order_First);
112 Default_Bit_Order : constant Bit_Order := High_Order_First;
113 pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
114
115 -- Priority-related Declarations (RM D.1)
116
117 -- Ada priorities are mapped to VxWorks priorities using the following
118 -- transformation: 255 - Ada Priority
119
120 -- Ada priorities are used as follows:
121
122 -- 256 is reserved for the VxWorks kernel
123 -- 248 - 255 correspond to hardware interrupt levels 0 .. 7
124 -- 247 is a catchall default "interrupt" priority for signals,
125 -- allowing higher priority than normal tasks, but lower than
126 -- hardware priority levels. Protected Object ceilings can
127 -- override these values.
128 -- 246 is used by the Interrupt_Manager task
129
130 Max_Priority : constant Positive := 245;
131 Max_Interrupt_Priority : constant Positive := 255;
132
133 subtype Any_Priority is Integer range 0 .. 255;
134 subtype Priority is Any_Priority range 0 .. 245;
135 subtype Interrupt_Priority is Any_Priority range 246 .. 255;
136
137 Default_Priority : constant Priority := 122;
138
139 private
140
141 type Address is mod Memory_Size;
142 Null_Address : constant Address := 0;
143
144 --------------------------------------
145 -- System Implementation Parameters --
146 --------------------------------------
147
148 -- These parameters provide information about the target that is used
149 -- by the compiler. They are in the private part of System, where they
150 -- can be accessed using the special circuitry in the Targparm unit
151 -- whose source should be consulted for more detailed descriptions
152 -- of the individual switch values.
153
154 Backend_Divide_Checks : constant Boolean := False;
155 Backend_Overflow_Checks : constant Boolean := True;
156 Command_Line_Args : constant Boolean := False;
157 Configurable_Run_Time : constant Boolean := True;
158 Denorm : constant Boolean := True;
159 Duration_32_Bits : constant Boolean := False;
160 Exit_Status_Supported : constant Boolean := True;
161 Fractional_Fixed_Ops : constant Boolean := False;
162 Frontend_Layout : constant Boolean := False;
163 Machine_Overflows : constant Boolean := False;
164 Machine_Rounds : constant Boolean := True;
165 Preallocated_Stacks : constant Boolean := False;
166 Signed_Zeros : constant Boolean := True;
167 Stack_Check_Default : constant Boolean := False;
168 Stack_Check_Probes : constant Boolean := False;
169 Stack_Check_Limits : constant Boolean := True;
170 Support_Aggregates : constant Boolean := True;
171 Support_Composite_Assign : constant Boolean := True;
172 Support_Composite_Compare : constant Boolean := True;
173 Support_Long_Shifts : constant Boolean := True;
174 Always_Compatible_Rep : constant Boolean := True;
175 Suppress_Standard_Library : constant Boolean := False;
176 Use_Ada_Main_Program_Name : constant Boolean := True;
177 Frontend_Exceptions : constant Boolean := True;
178 ZCX_By_Default : constant Boolean := False;
179
180 Executable_Extension : constant String := ".out";
181
182 end System;