File : system-pikeos-ppc-ravenscar-full.ads


   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                          (PikeOS PPC Version)                            --
   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 --  This is a Ravenscar version of this package for PowerPC PikeOS targets
  38 
  39 pragma Restrictions (No_Exception_Registration);
  40 --  Disable exception name registration. This capability is not used because
  41 --  it is only required by exception stream attributes which are not supported
  42 --  in this run time.
  43 
  44 pragma Profile (GNAT_Extended_Ravenscar);
  45 --  This is a Ravenscar run time
  46 
  47 package System is
  48    pragma Pure;
  49    --  Note that we take advantage of the implementation permission to make
  50    --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
  51    --  2005, this is Pure in any case (AI-362).
  52 
  53    pragma No_Elaboration_Code_All;
  54    --  Allow the use of that restriction in units that WITH this unit
  55 
  56    type Name is (SYSTEM_NAME_GNAT);
  57    System_Name : constant Name := SYSTEM_NAME_GNAT;
  58 
  59    --  System-Dependent Named Numbers
  60 
  61    Min_Int               : constant := Long_Long_Integer'First;
  62    Max_Int               : constant := Long_Long_Integer'Last;
  63 
  64    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  65    Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
  66 
  67    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  68    Max_Digits            : constant := Long_Long_Float'Digits;
  69 
  70    Max_Mantissa          : constant := 63;
  71    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  72 
  73    Tick                  : constant := 0.000_000_001; --  1 ns
  74 
  75    --  Storage-related Declarations
  76 
  77    type Address is private;
  78    pragma Preelaborable_Initialization (Address);
  79    Null_Address : constant Address;
  80 
  81    Storage_Unit : constant := 8;
  82    Word_Size    : constant := 32;
  83    Memory_Size  : constant := 2 ** 32;
  84 
  85    --  Address comparison
  86 
  87    function "<"  (Left, Right : Address) return Boolean;
  88    function "<=" (Left, Right : Address) return Boolean;
  89    function ">"  (Left, Right : Address) return Boolean;
  90    function ">=" (Left, Right : Address) return Boolean;
  91    function "="  (Left, Right : Address) return Boolean;
  92 
  93    pragma Import (Intrinsic, "<");
  94    pragma Import (Intrinsic, "<=");
  95    pragma Import (Intrinsic, ">");
  96    pragma Import (Intrinsic, ">=");
  97    pragma Import (Intrinsic, "=");
  98 
  99    --  Other System-Dependent Declarations
 100 
 101    type Bit_Order is (High_Order_First, Low_Order_First);
 102    Default_Bit_Order : constant Bit_Order := High_Order_First;
 103    pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
 104 
 105    --  Priority-related Declarations (RM D.1)
 106 
 107    --  For simplicity there is a 1-1 correspondence between Ada and PikeOS
 108    --  priorities. PikeOS priority 0 is reserved by the idle thread, so not
 109    --  available to Ada.
 110 
 111    --  PikeOS priorities are 0 .. 255
 112 
 113    --  Priorities greather than 245 are reserved to the system software (PSSW)
 114 
 115    --  This implementation reserves priorities 224-239 to interrupts
 116 
 117    --  Priorities 240-245 are reserved to HM and PikeOS exception handlers
 118 
 119    Max_Priority           : constant Positive := 223;
 120    Max_Interrupt_Priority : constant Positive := 239;
 121 
 122    subtype Any_Priority       is Integer range 1 .. Max_Interrupt_Priority;
 123    subtype Priority           is Any_Priority
 124      range Any_Priority'First .. Max_Priority;
 125    subtype Interrupt_Priority is Any_Priority
 126      range Priority'Last + 1 .. Any_Priority'Last;
 127 
 128    Default_Priority : constant Priority :=
 129                         (Priority'First + Priority'Last) / 2;
 130 
 131 private
 132 
 133    type Address is mod Memory_Size;
 134    Null_Address : constant Address := 0;
 135 
 136    --------------------------------------
 137    -- System Implementation Parameters --
 138    --------------------------------------
 139 
 140    --  These parameters provide information about the target that is used
 141    --  by the compiler. They are in the private part of System, where they
 142    --  can be accessed using the special circuitry in the Targparm unit
 143    --  whose source should be consulted for more detailed descriptions
 144    --  of the individual switch values.
 145 
 146    Atomic_Sync_Default       : constant Boolean := False;
 147    Backend_Divide_Checks     : constant Boolean := False;
 148    Backend_Overflow_Checks   : constant Boolean := True;
 149    Command_Line_Args         : constant Boolean := False;
 150    Configurable_Run_Time     : constant Boolean := True;
 151    Denorm                    : constant Boolean := True;
 152    Duration_32_Bits          : constant Boolean := False;
 153    Exit_Status_Supported     : constant Boolean := False;
 154    Fractional_Fixed_Ops      : constant Boolean := False;
 155    Frontend_Layout           : constant Boolean := False;
 156    Machine_Overflows         : constant Boolean := False;
 157    Machine_Rounds            : constant Boolean := True;
 158    Preallocated_Stacks       : constant Boolean := True;
 159    Signed_Zeros              : constant Boolean := True;
 160    Stack_Check_Default       : constant Boolean := False;
 161    Stack_Check_Probes        : constant Boolean := True;
 162    Stack_Check_Limits        : constant Boolean := False;
 163    Support_Aggregates        : constant Boolean := True;
 164    Support_Composite_Assign  : constant Boolean := True;
 165    Support_Composite_Compare : constant Boolean := True;
 166    Support_Long_Shifts       : constant Boolean := True;
 167    Always_Compatible_Rep     : constant Boolean := True;
 168    Suppress_Standard_Library : constant Boolean := False;
 169    Use_Ada_Main_Program_Name : constant Boolean := False;
 170    Frontend_Exceptions       : constant Boolean := False;
 171    ZCX_By_Default            : constant Boolean := True;
 172 
 173    --  Select the appropriate entry point, linker script, and libraries for a
 174    --  PikeOS partition.
 175 
 176    --  Traditionally the entry point of a native application is _p4_entry. For
 177    --  an APEX application, it is _begin.
 178 
 179    --  In order to use the same link options for both personalities, _begin is
 180    --  used for native as well.
 181 
 182    pragma Linker_Options
 183       ("-u_begin" & ASCII.NUL & "-e_begin" & ASCII.NUL &
 184        "-nostdlib" & ASCII.NUL &
 185        "-T../scripts/app-ld-script" & ASCII.NUL &
 186        "-lvm" & ASCII.NUL & "-lp4" & ASCII.NUL & "-lstand" & ASCII.NUL &
 187        "-lgcc");
 188 
 189 end System;