| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- I N T E R F A C E S . V X W O R K S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1999-2021, AdaCore -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. -- |
| -- Extensive contributions were provided by Ada Core Technologies, Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is the x86 VxWorks version of this package |
| |
| -- This package provides a limited binding to the VxWorks API |
| -- In particular, it interfaces with the VxWorks hardware interrupt |
| -- facilities, allowing the use of low-latency direct-vectored |
| -- interrupt handlers. Note that such handlers have a variety of |
| -- restrictions regarding system calls and language constructs. In particular, |
| -- the use of exception handlers and functions returning variable-length |
| -- objects cannot be used. Less restrictive, but higher-latency handlers can |
| -- be written using Ada protected procedures, Ada 83 style interrupt entries, |
| -- or by signalling an Ada task from within an interrupt handler using a |
| -- binary semaphore as described in the VxWorks Programmer's Manual. |
| -- |
| -- For complete documentation of the operations in this package, please |
| -- consult the VxWorks Programmer's Manual and VxWorks Reference Manual. |
| |
| pragma Warnings (Off, "*foreign convention*"); |
| pragma Warnings (Off, "*add Convention pragma*"); |
| |
| with System.VxWorks; |
| |
| package Interfaces.VxWorks is |
| pragma Preelaborate; |
| |
| ------------------------------------------------------------------------ |
| -- Here is a complete example that shows how to handle the Interrupt 0x33 |
| -- with a direct-vectored interrupt handler in Ada using this package: |
| |
| -- with Interfaces.VxWorks; use Interfaces.VxWorks; |
| -- with System; |
| -- |
| -- package P is |
| -- |
| -- Count : Integer; |
| -- pragma Atomic (Count); |
| -- |
| -- procedure Handler (Parameter : System.Address); |
| -- |
| -- end P; |
| -- |
| -- package body P is |
| -- |
| -- procedure Handler (Parameter : System.Address) is |
| -- begin |
| -- Count := Count + 1; |
| -- logMsg ("received an interrupt" & ASCII.LF & ASCII.NUL); |
| -- end Handler; |
| -- end P; |
| -- |
| -- with Interfaces.VxWorks; use Interfaces.VxWorks; |
| -- with Ada.Text_IO; use Ada.Text_IO; |
| -- with Ada.Interrupts; |
| -- with Machine_Code; use Machine_Code; |
| -- |
| -- with P; use P; |
| -- procedure Useint is |
| -- |
| -- -- Be sure to use a reasonable interrupt number for target board. |
| -- -- This one is an unreserved interrupt for the Pentium 3 BSP |
| -- |
| -- Interrupt : constant := 16#33#; |
| -- |
| -- task T; |
| -- |
| -- S : STATUS; |
| -- |
| -- task body T is |
| -- begin |
| -- loop |
| -- Put_Line ("Generating an interrupt..."); |
| -- delay 1.0; |
| -- |
| -- -- Generate interrupt, using interrupt number |
| -- |
| -- Asm ("int %0", |
| -- Inputs => |
| -- Ada.Interrupts.Interrupt_ID'Asm_Input |
| -- ("i", Interrupt)); |
| -- end loop; |
| -- end T; |
| -- |
| -- begin |
| -- S := intConnect (INUM_TO_IVEC (Interrupt), Handler'Access); |
| -- |
| -- loop |
| -- delay 2.0; |
| -- Put_Line ("value of count:" & P.Count'Img); |
| -- end loop; |
| -- end Useint; |
| ------------------------------------- |
| |
| subtype int is Integer; |
| |
| type STATUS is new int; |
| -- Equivalent of the C type STATUS |
| |
| OK : constant STATUS := 0; |
| ERROR : constant STATUS := -1; |
| |
| type VOIDFUNCPTR is access procedure (parameter : System.Address); |
| type Interrupt_Vector is new System.Address; |
| type Exception_Vector is new System.Address; |
| |
| function intConnect |
| (vector : Interrupt_Vector; |
| handler : VOIDFUNCPTR; |
| parameter : System.Address := System.Null_Address) return STATUS; |
| -- Binding to the C routine intConnect. Use this to set up an user handler. |
| -- The routine generates a wrapper around the user handler to save and |
| -- restore context |
| |
| function intContext return int; |
| -- Binding to the C routine intContext. This function returns 1 only if the |
| -- current execution state is in interrupt context. |
| |
| function intVecGet |
| (Vector : Interrupt_Vector) return VOIDFUNCPTR; |
| -- Binding to the C routine intVecGet. Use this to get the existing handler |
| -- for later restoral |
| |
| procedure intVecSet |
| (Vector : Interrupt_Vector; |
| Handler : VOIDFUNCPTR); |
| -- Binding to the C routine intVecSet. Use this to restore a handler |
| -- obtained using intVecGet |
| |
| procedure intVecGet2 |
| (vector : Interrupt_Vector; |
| pFunction : out VOIDFUNCPTR; |
| pIdtGate : not null access int; |
| pIdtSelector : not null access int); |
| -- Binding to the C routine intVecGet2. Use this to get the existing |
| -- handler for later restoral |
| |
| procedure intVecSet2 |
| (vector : Interrupt_Vector; |
| pFunction : VOIDFUNCPTR; |
| pIdtGate : not null access int; |
| pIdtSelector : not null access int); |
| -- Binding to the C routine intVecSet2. Use this to restore a |
| -- handler obtained using intVecGet2 |
| |
| function INUM_TO_IVEC (intNum : int) return Interrupt_Vector; |
| -- Equivalent to the C macro INUM_TO_IVEC used to convert an interrupt |
| -- number to an interrupt vector |
| |
| procedure logMsg |
| (fmt : String; arg1, arg2, arg3, arg4, arg5, arg6 : int := 0); |
| -- Binding to the C routine logMsg. Note that it is the caller's |
| -- responsibility to ensure that fmt is a null-terminated string |
| -- (e.g logMsg ("Interrupt" & ASCII.NUL)) |
| |
| type FP_CONTEXT is private; |
| -- Floating point context save and restore. Handlers using floating point |
| -- must be bracketed with these calls. The pFpContext parameter should be |
| -- an object of type FP_CONTEXT that is declared local to the handler. |
| -- |
| -- See the VxWorks Intel Architecture Supplement regarding these routines |
| |
| procedure fppRestore (pFpContext : in out FP_CONTEXT); |
| -- Restore floating point context - old style |
| |
| procedure fppSave (pFpContext : in out FP_CONTEXT); |
| -- Save floating point context - old style |
| |
| procedure fppXrestore (pFpContext : in out FP_CONTEXT); |
| -- Restore floating point context - new style |
| |
| procedure fppXsave (pFpContext : in out FP_CONTEXT); |
| -- Save floating point context - new style |
| |
| private |
| |
| type FP_CONTEXT is new System.VxWorks.FP_CONTEXT; |
| -- Target-dependent floating point context type |
| |
| pragma Import (C, intConnect, "intConnect"); |
| pragma Import (C, intContext, "intContext"); |
| pragma Import (C, intVecGet, "intVecGet"); |
| pragma Import (C, intVecSet, "intVecSet"); |
| pragma Import (C, intVecGet2, "intVecGet2"); |
| pragma Import (C, intVecSet2, "intVecSet2"); |
| pragma Import (C, INUM_TO_IVEC, "__gnat_inum_to_ivec"); |
| pragma Import (C, logMsg, "logMsg"); |
| pragma Import (C, fppRestore, "fppRestore"); |
| pragma Import (C, fppSave, "fppSave"); |
| pragma Import (C, fppXrestore, "fppXrestore"); |
| pragma Import (C, fppXsave, "fppXsave"); |
| end Interfaces.VxWorks; |
