L4Re Operating System Framework
Interface and Usage Documentation
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io_regblock_port.h
1/*
2 * (c) 2012 Adam Lackorzynski <adam@os.inf.tu-dresden.de>
3 * economic rights: Technische Universität Dresden (Germany)
4 *
5 * This file is part of TUD:OS and distributed under the terms of the
6 * GNU General Public License 2.
7 * Please see the COPYING-GPL-2 file for details.
8 */
9#pragma once
10
11#include "io_regblock.h"
12
13namespace L4
14{
15 class Io_register_block_port : public Io_register_block
16 {
17 public:
18 Io_register_block_port(unsigned long base)
19 : _base(base)
20 {}
21
22 unsigned long addr(unsigned long reg) const { return _base + reg; }
23
24 unsigned char read8(unsigned long reg) const
25 {
26 unsigned char val;
27 asm volatile("inb %w1, %b0" : "=a" (val) : "Nd" (_base + reg));
28 return val;
29 }
30
31 unsigned short read16(unsigned long reg) const
32 {
33 unsigned short val;
34 asm volatile("inw %w1, %w0" : "=a" (val) : "Nd" (_base + reg));
35 return val;
36 }
37
38 unsigned int read32(unsigned long reg) const
39 {
40 unsigned int val;
41 asm volatile("in %w1, %0" : "=a" (val) : "Nd" (_base + reg));
42 return val;
43 }
44
45 void write8(unsigned long reg, unsigned char val) const
46 { asm volatile("outb %b0, %w1" : : "a" (val), "Nd" (_base + reg)); }
47
48 void write16(unsigned long reg, unsigned short val) const
49 { asm volatile("outw %w0, %w1" : : "a" (val), "Nd" (_base + reg)); }
50
51 void write32(unsigned long reg, unsigned int val) const
52 { asm volatile("out %0, %w1" : : "a" (val), "Nd" (_base + reg)); }
53
54 void delay() const
55 { asm volatile ("outb %al,$0x80"); }
56
57 private:
58 unsigned long _base;
59 };
60}
L4 low-level kernel interface.
Definition io_regblock.h:19