gcc/ada/i-vxwork.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS              --
   4 --                                                                          --
   5 --                      I N T E R F A C E S . V X W O R K S                 --
   6 --                                                                          --
   7 --                                   S p e c                                --
   8 --                                                                          --
   9 --                               $Revision: 1.4 $
  10 --                                                                          --
  11 --            Copyright (C) 1999 - 2001 Ada Core Technologies, Inc.         --
  12 --                                                                          --
  13 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNARL was developed by the GNARL team at Florida State University. It is --
  32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  33 -- State University (http://www.gnat.com).                                  --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 --  This package provides a limited binding to the VxWorks API
  38 --  In particular, it interfaces with the VxWorks hardware interrupt
  39 --  facilities, allowing the use of low-latency direct-vectored
  40 --  interrupt handlers. Note that such handlers have a variety of
  41 --  restrictions regarding system calls. Less restrictive, but higher-
  42 --  latency handlers can be written using Ada protected procedures,
  43 --  Ada 83 style interrupt entries, or by signalling an Ada task
  44 --  from within an interrupt handler using a binary semaphore as
  45 --  described in the VxWorks Programmer's Manual
  46 --
  47 --  For complete documentation of the operations in this package, please
  48 --  consult the VxWorks Programmer's Manual and VxWorks Reference Manual
  49
  50 with System.VxWorks;
  51
  52 package Interfaces.VxWorks is
  53    pragma Preelaborate (VxWorks);
  54
  55    ------------------------------------------------------------------------
  56    --  Here is a complete example that shows how to handle the Interrupt 0x14
  57    --  with a direct-vectored interrupt handler in Ada using this package:
  58
  59    --  with Interfaces.VxWorks; use Interfaces.VxWorks;
  60    --  with System;
  61    --
  62    --  package P is
  63    --
  64    --     Count : Integer;
  65    --     pragma Atomic (Count);
  66    --
  67    --     Level : constant := 1;
  68    --     --  Interrupt level used by this example
  69    --
  70    --     procedure Handler (parameter : System.Address);
  71    --
  72    --  end P;
  73    --
  74    --  package body P is
  75    --
  76    --     procedure Handler (parameter : System.Address) is
  77    --        S : STATUS;
  78    --     begin
  79    --        Count := Count + 1;
  80    --        logMsg ("received an interrupt" & ASCII.LF & ASCII.Nul);
  81    --
  82    --        --  Acknowledge VME interrupt
  83    --        S := sysBusIntAck (intLevel => Level);
  84    --     end Handler;
  85    --  end P;
  86    --
  87    --  with Interfaces.VxWorks; use Interfaces.VxWorks;
  88    --  with Ada.Text_IO; use Ada.Text_IO;
  89    --
  90    --  with P; use P;
  91    --  procedure Useint is
  92    --     --  Be sure to use a reasonable interrupt number for the target
  93    --     --  board!
  94    --     --  This one is the unused VME graphics interrupt on the PPC MV2604
  95    --     Interrupt : constant := 16#14#;
  96    --
  97    --     task T;
  98    --
  99    --     S : STATUS;
 100    --
 101    --     task body T is
 102    --     begin
 103    --        loop
 104    --           Put_Line ("Generating an interrupt...");
 105    --           delay 1.0;
 106    --
 107    --           --  Generate VME interrupt, using interrupt number
 108    --           S := sysBusIntGen (1, Interrupt);
 109    --        end loop;
 110    --     end T;
 111    --
 112    --  begin
 113    --     S := sysIntEnable (intLevel => Level);
 114    --     S := intConnect (INUM_TO_IVEC (Interrupt), handler'Access);
 115    --
 116    --     loop
 117    --        delay 2.0;
 118    --        Put_Line ("value of count:" & P.Count'Img);
 119    --     end loop;
 120    --  end Useint;
 121    -------------------------------------
 122
 123    subtype int is Integer;
 124
 125    type STATUS is new int;
 126    --  Equivalent of the C type STATUS
 127
 128    OK    : constant STATUS := 0;
 129    ERROR : constant STATUS := -1;
 130
 131    type VOIDFUNCPTR is access procedure (parameter : System.Address);
 132    type Interrupt_Vector is new System.Address;
 133    type Exception_Vector is new System.Address;
 134
 135    function intConnect
 136      (vector    : Interrupt_Vector;
 137       handler   : VOIDFUNCPTR;
 138       parameter : System.Address := System.Null_Address) return STATUS;
 139    --  Binding to the C routine intConnect. Use this to set up an
 140    --  user handler. The routine generates a wrapper around the user
 141    --  handler to save and restore context
 142
 143    function intVecGet
 144      (Vector : Interrupt_Vector) return VOIDFUNCPTR;
 145    --  Binding to the C routine intVecGet. Use this to get the
 146    --  existing handler for later restoral
 147
 148    procedure intVecSet
 149      (Vector  : Interrupt_Vector;
 150       Handler : VOIDFUNCPTR);
 151    --  Binding to the C routine intVecSet. Use this to restore a
 152    --  handler obtained using intVecGet
 153
 154    function INUM_TO_IVEC (intNum : int) return Interrupt_Vector;
 155    --  Equivalent to the C macro INUM_TO_IVEC used to convert an interrupt
 156    --  number to an interrupt vector
 157
 158    function sysIntEnable (intLevel : int) return STATUS;
 159    --  Binding to the C routine sysIntEnable
 160
 161    function sysIntDisable (intLevel : int) return STATUS;
 162    --  Binding to the C routine sysIntDisable
 163
 164    function sysBusIntAck (intLevel : int) return STATUS;
 165    --  Binding to the C routine sysBusIntAck
 166
 167    function sysBusIntGen (intLevel : int; Intnum : int) return STATUS;
 168    --  Binding to the C routine sysBusIntGen. Note that the T2
 169    --  documentation implies that a vector address is the proper
 170    --  argument - it's not. The interrupt number in the range
 171    --  0 .. 255 (for 68K and PPC) is the correct agument.
 172
 173    procedure logMsg
 174      (fmt : String; arg1, arg2, arg3, arg4, arg5, arg6 : int := 0);
 175    --  Binding to the C routine logMsg. Note that it is the caller's
 176    --  responsibility to ensure that fmt is a null-terminated string
 177    --  (e.g logMsg ("Interrupt" & ASCII.NUL))
 178
 179    type FP_CONTEXT is private;
 180    --  Floating point context save and restore. Handlers using floating
 181    --  point must be bracketed with these calls. The pFpContext parameter
 182    --  should be an object of type FP_CONTEXT that is
 183    --  declared local to the handler.
 184
 185    procedure fppRestore (pFpContext : in out FP_CONTEXT);
 186    --  Restore floating point context
 187
 188    procedure fppSave (pFpContext : in out FP_CONTEXT);
 189    --  Save floating point context
 190
 191 private
 192
 193    type FP_CONTEXT is new System.VxWorks.FP_CONTEXT;
 194    --  Target-dependent floating point context type
 195
 196    pragma Import (C, intConnect, "intConnect");
 197    pragma Import (C, intVecGet, "intVecGet");
 198    pragma Import (C, intVecSet, "intVecSet");
 199    pragma Import (C, INUM_TO_IVEC, "__gnat_inum_to_ivec");
 200    pragma Import (C, sysIntEnable, "sysIntEnable");
 201    pragma Import (C, sysIntDisable, "sysIntDisable");
 202    pragma Import (C, sysBusIntAck, "sysBusIntAck");
 203    pragma Import (C, sysBusIntGen, "sysBusIntGen");
 204    pragma Import (C, logMsg, "logMsg");
 205    pragma Import (C, fppRestore, "fppRestore");
 206    pragma Import (C, fppSave, "fppSave");
 207 end Interfaces.VxWorks;