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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Singleton.h>
#include <Kernel/Console.h>
#include <Kernel/IO.h>
#include <Kernel/SpinLock.h>
#include <Kernel/kstdio.h>
// Bytes output to 0xE9 end up on the Bochs console. It's very handy.
#define CONSOLE_OUT_TO_E9
static AK::Singleton<Console> s_the;
static Kernel::SpinLock g_console_lock;
void Console::initialize()
{
s_the.ensure_instance();
}
Console& Console::the()
{
return *s_the;
}
bool Console::is_initialized()
{
return s_the.is_initialized();
}
Console::Console()
: CharacterDevice(5, 1)
{
}
Console::~Console()
{
}
bool Console::can_read(const Kernel::FileDescription&, size_t) const
{
return false;
}
Kernel::KResultOr<size_t> Console::read(Kernel::FileDescription&, size_t, Kernel::UserOrKernelBuffer&, size_t)
{
// FIXME: Implement reading from the console.
// Maybe we could use a ring buffer for this device?
return 0;
}
Kernel::KResultOr<size_t> Console::write(Kernel::FileDescription&, size_t, const Kernel::UserOrKernelBuffer& data, size_t size)
{
if (!size)
return 0;
ssize_t nread = data.read_buffered<256>(size, [&](const u8* bytes, size_t bytes_count) {
for (size_t i = 0; i < bytes_count; i++)
put_char((char)bytes[i]);
return (ssize_t)bytes_count;
});
if (nread < 0)
return Kernel::KResult((ErrnoCode)-nread);
return (size_t)nread;
}
void Console::put_char(char ch)
{
Kernel::ScopedSpinLock lock(g_console_lock);
#ifdef CONSOLE_OUT_TO_E9
//if (ch != 27)
IO::out8(0xe9, ch);
#endif
m_logbuffer.enqueue(ch);
}
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