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7a3ab6c517
Instead of returning a ssize_t where negative values mean error, we now return KResultOr<size_t> and use the error state to report errors exclusively.
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Console.h>
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#include <Kernel/IO.h>
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#include <Kernel/kstdio.h>
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#include <Kernel/SpinLock.h>
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// Bytes output to 0xE9 end up on the Bochs console. It's very handy.
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#define CONSOLE_OUT_TO_E9
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static Console* s_the;
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static Kernel::SpinLock g_console_lock;
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Console& Console::the()
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{
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ASSERT(s_the);
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return *s_the;
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}
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bool Console::is_initialized()
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{
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return s_the != nullptr;
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}
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Console::Console()
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: CharacterDevice(5, 1)
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{
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s_the = this;
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}
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Console::~Console()
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{
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}
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bool Console::can_read(const Kernel::FileDescription&, size_t) const
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{
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return false;
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}
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Kernel::KResultOr<size_t> Console::read(Kernel::FileDescription&, size_t, u8*, size_t)
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{
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// FIXME: Implement reading from the console.
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// Maybe we could use a ring buffer for this device?
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return 0;
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}
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Kernel::KResultOr<size_t> Console::write(Kernel::FileDescription&, size_t, const u8* data, size_t size)
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{
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if (!size)
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return 0;
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for (size_t i = 0; i < size; ++i)
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put_char(data[i]);
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return size;
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}
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void Console::put_char(char ch)
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{
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Kernel::ScopedSpinLock lock(g_console_lock);
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#ifdef CONSOLE_OUT_TO_E9
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//if (ch != 27)
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IO::out8(0xe9, ch);
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#endif
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m_logbuffer.enqueue(ch);
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}
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