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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <Kernel/ConsoleDevice.h>
#include <Kernel/IO.h>
#include <Kernel/Locking/Spinlock.h>
#include <Kernel/Sections.h>
#include <Kernel/kstdio.h>
// Output bytes to kernel debug port 0xE9 (Bochs console). It's very handy.
#define CONSOLE_OUT_TO_BOCHS_DEBUG_PORT
static Singleton<ConsoleDevice> s_the;
static Kernel::Spinlock g_console_lock;
UNMAP_AFTER_INIT void ConsoleDevice::initialize()
{
s_the.ensure_instance();
}
ConsoleDevice& ConsoleDevice::the()
{
return *s_the;
}
bool ConsoleDevice::is_initialized()
{
return s_the.is_initialized();
}
UNMAP_AFTER_INIT ConsoleDevice::ConsoleDevice()
: CharacterDevice(5, 1)
{
}
UNMAP_AFTER_INIT ConsoleDevice::~ConsoleDevice()
{
}
bool ConsoleDevice::can_read(const Kernel::FileDescription&, size_t) const
{
return false;
}
Kernel::KResultOr<size_t> ConsoleDevice::read(FileDescription&, u64, 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> ConsoleDevice::write(FileDescription&, u64, const Kernel::UserOrKernelBuffer& data, size_t size)
{
if (!size)
return 0;
return data.read_buffered<256>(size, [&](u8 const* bytes, size_t bytes_count) {
for (size_t i = 0; i < bytes_count; i++)
put_char((char)bytes[i]);
return bytes_count;
});
}
void ConsoleDevice::put_char(char ch)
{
Kernel::SpinlockLocker lock(g_console_lock);
#ifdef CONSOLE_OUT_TO_BOCHS_DEBUG_PORT
IO::out8(IO::BOCHS_DEBUG_PORT, ch);
#endif
m_logbuffer.enqueue(ch);
}
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