File : s-ioport-prep.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M . I O P O R T S --
6 -- --
7 -- Copyright (C) 2010-2011, AdaCore --
8 -- --
9 -- B o d y --
10 -- --
11 -- GNAT 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 3, or (at your option) any later ver- --
14 -- sion. GNAT 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. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- This package is specific to powerpc-elf on PREP platform. It provides an
33 -- interface to the IO ports.
34
35 pragma Restrictions (No_Elaboration_Code);
36
37 with Interfaces;
38
39 package System.IOPorts is
40 pragma Preelaborate;
41
42 type Port_Id is range 0 .. 16#ffff#;
43 -- IO port range
44
45 procedure Outb (P : Port_Id; B : Interfaces.Unsigned_8);
46 pragma Inline (Outb);
47 -- Write a byte to a port
48
49 function Inb (P : Port_Id) return Interfaces.Unsigned_8;
50 pragma Inline (Inb);
51 -- Read a byte from a port
52 end System.IOPorts;