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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <LibBareMetal/IO.h>
28#include <LibBareMetal/Output/Console.h>
29#include <LibBareMetal/Output/kstdio.h>
30
31// Bytes output to 0xE9 end up on the Bochs console. It's very handy.
32#define CONSOLE_OUT_TO_E9
33
34static Console* s_the;
35
36Console& Console::the()
37{
38 ASSERT(s_the);
39 return *s_the;
40}
41
42bool Console::is_initialized()
43{
44 return s_the != nullptr;
45}
46
47Console::Console()
48#if defined(KERNEL)
49 : CharacterDevice(5, 1)
50#endif
51{
52 s_the = this;
53}
54
55Console::~Console()
56{
57}
58
59#if defined(KERNEL)
60bool Console::can_read(const Kernel::FileDescription&) const
61{
62 return false;
63}
64
65ssize_t Console::read(Kernel::FileDescription&, u8*, ssize_t)
66{
67 // FIXME: Implement reading from the console.
68 // Maybe we could use a ring buffer for this device?
69 return 0;
70}
71
72ssize_t Console::write(Kernel::FileDescription&, const u8* data, ssize_t size)
73{
74 if (!size)
75 return 0;
76 if (!m_implementation)
77 return 0;
78 for (ssize_t i = 0; i < size; ++i)
79 put_char(data[i]);
80 return size;
81}
82#endif
83
84void Console::put_char(char ch)
85{
86#ifdef CONSOLE_OUT_TO_E9
87 //if (ch != 27)
88 IO::out8(0xe9, ch);
89#endif
90 m_logbuffer.enqueue(ch);
91 if (m_implementation)
92 m_implementation->on_sysconsole_receive(ch);
93}
94
95ConsoleImplementation::~ConsoleImplementation()
96{
97}