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------------------------------------------------------------------------------
-- --
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- S p e c --
-- --
-- Copyright (C) 1991-2001 Florida State University --
-- --
-- GNARL 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 2, or (at your option) any later ver- --
-- sion. GNARL 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. It is --
-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
-- State University (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- RT GNU/Linux version.
-- This package encapsulates all direct interfaces to OS services
-- that are needed by children of System.
-- PLEASE DO NOT add any with-clauses to this package
-- or remove the pragma Elaborate_Body.
-- It is designed to be a bottom-level (leaf) package.
with Interfaces.C;
package System.OS_Interface is
pragma Preelaborate;
subtype int is Interfaces.C.int;
subtype unsigned_long is Interfaces.C.unsigned_long;
-- RT GNU/Linux kernel threads should not use the
-- OS signal interfaces.
Max_Interrupt : constant := 2;
type Signal is new int range 0 .. Max_Interrupt;
type sigset_t is new Integer;
----------
-- Time --
----------
RT_TICKS_PER_SEC : constant := 1193180;
-- the amount of time units in one second.
RT_TIME_END : constant := 16#7fffFfffFfffFfff#;
type RTIME is range -2 ** 63 .. 2 ** 63 - 1;
-- the introduction of type RTIME is due to the fact that RT-GNU/Linux
-- uses this type to represent time. In RT-GNU/Linux, it's a long long
-- integer that takes 64 bits for storage
-------------------------
-- Priority Scheduling --
-------------------------
RT_LOWEST_PRIORITY : constant System.Any_Priority :=
System.Any_Priority'First;
-- for the lowest priority task in RT-GNU/Linux. By the design, this
-- task is the regular GNU/Linux kernel.
RT_TASK_MAGIC : constant := 16#754d2774#;
-- a special constant used as a label for a task that has been created
----------------------------
-- RT constants and types --
----------------------------
SFIF : Integer;
pragma Import (C, SFIF, "SFIF");
-- Interrupt emulation flag used by RT-GNU/Linux. If it's 0, the regular
-- GNU/Linux kernel is preempted. Otherwise, the regular Linux kernel is
-- running
GFP_ATOMIC : constant := 16#1#;
GFP_KERNEL : constant := 16#3#;
-- constants to indicate the priority of a call to kmalloc.
-- GFP_KERNEL is used in the current implementation to allocate
-- stack space for a task. Since GFP_ATOMIC has higher priority,
-- if necessary, replace GFP_KERNEL with GFP_ATOMIC
type Rt_Task_States is (RT_TASK_READY, RT_TASK_DELAYED, RT_TASK_DORMANT);
-------------
-- Threads --
-------------
type Thread_Body is access
function (arg : System.Address) return System.Address;
-- ??? need to define a type for references to (IDs of)
-- RT GNU/Linux lock objects, and implement the lock objects.
subtype Thread_Id is System.Address;
-------------------------------
-- Useful imported functions --
-------------------------------
-------------------------------------
-- Functions from GNU/Linux kernel --
-------------------------------------
function Kmalloc (size : Integer; Priority : Integer) return System.Address;
pragma Import (C, Kmalloc, "kmalloc");
procedure Kfree (Ptr : System.Address);
pragma Import (C, Kfree, "kfree");
procedure Printk (Msg : String);
pragma Import (C, Printk, "printk");
---------------------
-- RT time related --
---------------------
function Rt_Get_Time return RTIME;
pragma Import (C, Rt_Get_Time, "rt_get_time");
function Rt_Request_Timer (Fn : System.Address) return Integer;
procedure Rt_Request_Timer (Fn : System.Address);
pragma Import (C, Rt_Request_Timer, "rt_request_timer");
procedure Rt_Free_Timer;
pragma Import (C, Rt_Free_Timer, "rt_free_timer");
procedure Rt_Set_Timer (T : RTIME);
pragma Import (C, Rt_Set_Timer, "rt_set_timer");
procedure Rt_No_Timer;
pragma Import (C, Rt_No_Timer, "rt_no_timer");
---------------------
-- RT FIFO related --
---------------------
function Rtf_Create (Fifo : Integer; Size : Integer) return Integer;
pragma Import (C, Rtf_Create, "rtf_create");
function Rtf_Destroy (Fifo : Integer) return Integer;
pragma Import (C, Rtf_Destroy, "rtf_destroy");
function Rtf_Resize (Minor : Integer; Size : Integer) return Integer;
pragma Import (C, Rtf_Resize, "rtf_resize");
function Rtf_Put
(Fifo : Integer;
Buf : System.Address;
Count : Integer) return Integer;
pragma Import (C, Rtf_Put, "rtf_put");
function Rtf_Get
(Fifo : Integer;
Buf : System.Address;
Count : Integer) return Integer;
pragma Import (C, Rtf_Get, "rtf_get");
function Rtf_Create_Handler
(Fifo : Integer;
Handler : System.Address) return Integer;
pragma Import (C, Rtf_Create_Handler, "rtf_create_handler");
private
type Require_Body;
end System.OS_Interface;
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