gcc/ada/i-vxwork-x86.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                  GNAT 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 --                     Copyright (C) 1999-2008, AdaCore                     --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is the x86 VxWorks version of this package
  35
  36 --  This package provides a limited binding to the VxWorks API
  37 --  In particular, it interfaces with the VxWorks hardware interrupt
  38 --  facilities, allowing the use of low-latency direct-vectored
  39 --  interrupt handlers. Note that such handlers have a variety of
  40 --  restrictions regarding system calls and language constructs. In particular,
  41 --  the use of exception handlers and functions returning variable-length
  42 --  objects cannot be used. Less restrictive, but higher-latency handlers can
  43 --  be written using Ada protected procedures, Ada 83 style interrupt entries,
  44 --  or by signalling an Ada task from within an interrupt handler using a
  45 --  binary semaphore as 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 pragma Warnings (Off, "*foreign convention*");
  51 pragma Warnings (Off, "*add Convention pragma*");
  52
  53 with System.VxWorks;
  54
  55 package Interfaces.VxWorks is
  56    pragma Preelaborate;
  57
  58    ------------------------------------------------------------------------
  59    --  Here is a complete example that shows how to handle the Interrupt 0x33
  60    --  with a direct-vectored interrupt handler in Ada using this package:
  61
  62    --  with Interfaces.VxWorks; use Interfaces.VxWorks;
  63    --  with System;
  64    --
  65    --  package P is
  66    --
  67    --     Count : Integer;
  68    --     pragma Atomic (Count);
  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    --     begin
  78    --        Count := Count + 1;
  79    --        logMsg ("received an interrupt" & ASCII.LF & ASCII.NUL);
  80    --     end Handler;
  81    --  end P;
  82    --
  83    --  with Interfaces.VxWorks; use Interfaces.VxWorks;
  84    --  with Ada.Text_IO; use Ada.Text_IO;
  85    --  with Ada.Interrupts;
  86    --  with Machine_Code; use Machine_Code;
  87    --
  88    --  with P; use P;
  89    --  procedure Useint is
  90    --     --  Be sure to use a reasonable interrupt number for the target
  91    --     --  board!
  92    --     --  This one is an unreserved interrupt for the Pentium 3 BSP
  93    --     Interrupt : constant := 16#33#;
  94    --
  95    --     task T;
  96    --
  97    --     S : STATUS;
  98    --
  99    --     task body T is
 100    --     begin
 101    --        loop
 102    --           Put_Line ("Generating an interrupt...");
 103    --           delay 1.0;
 104    --
 105    --           --  Generate interrupt, using interrupt number
 106    --           Asm ("int %0",
 107    --                Inputs =>
 108    --                  Ada.Interrupts.Interrupt_ID'Asm_Input
 109    --                    ("i", Interrupt));
 110    --        end loop;
 111    --     end T;
 112    --
 113    --  begin
 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 intContext return int;
 144    --  Binding to the C routine intContext. This function returns 1 only
 145    --  if the current execution state is in interrupt context.
 146
 147    function intVecGet
 148      (Vector : Interrupt_Vector) return VOIDFUNCPTR;
 149    --  Binding to the C routine intVecGet. Use this to get the
 150    --  existing handler for later restoral
 151
 152    procedure intVecSet
 153      (Vector  : Interrupt_Vector;
 154       Handler : VOIDFUNCPTR);
 155    --  Binding to the C routine intVecSet. Use this to restore a
 156    --  handler obtained using intVecGet
 157
 158    procedure intVecGet2
 159      (vector       : Interrupt_Vector;
 160       pFunction    : out VOIDFUNCPTR;
 161       pIdtGate     : not null access int;
 162       pIdtSelector : not null access int);
 163    --  Binding to the C routine intVecGet2. Use this to get the
 164    --  existing handler for later restoral
 165
 166    procedure intVecSet2
 167      (vector       : Interrupt_Vector;
 168       pFunction    : VOIDFUNCPTR;
 169       pIdtGate     : not null access int;
 170       pIdtSelector : not null access int);
 171    --  Binding to the C routine intVecSet2. Use this to restore a
 172    --  handler obtained using intVecGet2
 173
 174    function INUM_TO_IVEC (intNum : int) return Interrupt_Vector;
 175    --  Equivalent to the C macro INUM_TO_IVEC used to convert an interrupt
 176    --  number to an interrupt vector
 177
 178    procedure logMsg
 179      (fmt : String; arg1, arg2, arg3, arg4, arg5, arg6 : int := 0);
 180    --  Binding to the C routine logMsg. Note that it is the caller's
 181    --  responsibility to ensure that fmt is a null-terminated string
 182    --  (e.g logMsg ("Interrupt" & ASCII.NUL))
 183
 184    type FP_CONTEXT is private;
 185    --  Floating point context save and restore. Handlers using floating
 186    --  point must be bracketed with these calls. The pFpContext parameter
 187    --  should be an object of type FP_CONTEXT that is
 188    --  declared local to the handler.
 189    --  See the VxWorks Intel Architecture Supplement regarding
 190    --  these routines.
 191
 192    procedure fppRestore (pFpContext : in out FP_CONTEXT);
 193    --  Restore floating point context - old style
 194
 195    procedure fppSave (pFpContext : in out FP_CONTEXT);
 196    --  Save floating point context - old style
 197
 198    procedure fppXrestore (pFpContext : in out FP_CONTEXT);
 199    --  Restore floating point context - new style
 200
 201    procedure fppXsave (pFpContext : in out FP_CONTEXT);
 202    --  Save floating point context - new style
 203
 204 private
 205
 206    type FP_CONTEXT is new System.VxWorks.FP_CONTEXT;
 207    --  Target-dependent floating point context type
 208
 209    pragma Import (C, intConnect, "intConnect");
 210    pragma Import (C, intContext, "intContext");
 211    pragma Import (C, intVecGet, "intVecGet");
 212    pragma Import (C, intVecSet, "intVecSet");
 213    pragma Import (C, intVecGet2, "intVecGet2");
 214    pragma Import (C, intVecSet2, "intVecSet2");
 215    pragma Import (C, INUM_TO_IVEC, "__gnat_inum_to_ivec");
 216    pragma Import (C, logMsg, "logMsg");
 217    pragma Import (C, fppRestore, "fppRestore");
 218    pragma Import (C, fppSave, "fppSave");
 219    pragma Import (C, fppXrestore, "fppXrestore");
 220    pragma Import (C, fppXsave, "fppXsave");
 221 end Interfaces.VxWorks;