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ConsoleDevice.cpp
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ConsoleDevice.cpp
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/*
* Copyright (c) 2018-2020, Andreas Kling <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Platform.h>
#if ARCH(X86_64)
# include <Kernel/Arch/x86_64/BochsDebugOutput.h>
#endif
#include <Kernel/Devices/ConsoleDevice.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Locking/Spinlock.h>
#include <Kernel/Sections.h>
#include <Kernel/kstdio.h>
namespace Kernel {
Spinlock<LockRank::None> g_console_lock {};
UNMAP_AFTER_INIT NonnullLockRefPtr<ConsoleDevice> ConsoleDevice::must_create()
{
auto device_or_error = DeviceManagement::try_create_device<ConsoleDevice>();
VERIFY(!device_or_error.is_error());
return device_or_error.release_value();
}
UNMAP_AFTER_INIT ConsoleDevice::ConsoleDevice()
: CharacterDevice(5, 1)
{
}
UNMAP_AFTER_INIT ConsoleDevice::~ConsoleDevice() = default;
bool ConsoleDevice::can_read(Kernel::OpenFileDescription const&, u64) const
{
return false;
}
ErrorOr<size_t> ConsoleDevice::read(OpenFileDescription&, u64, Kernel::UserOrKernelBuffer&, size_t)
{
// FIXME: Implement reading from the console.
// Maybe we could use a ring buffer for this device?
return 0;
}
ErrorOr<size_t> ConsoleDevice::write(OpenFileDescription&, u64, Kernel::UserOrKernelBuffer const& data, size_t size)
{
if (!size)
return 0;
return data.read_buffered<256>(size, [&](ReadonlyBytes readonly_bytes) {
for (const auto& byte : readonly_bytes)
put_char(byte);
return readonly_bytes.size();
});
}
void ConsoleDevice::put_char(char ch)
{
Kernel::SpinlockLocker lock(g_console_lock);
dbgputchar(ch);
m_logbuffer.enqueue(ch);
}
}