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190cf1507b
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/x86/IO.h>
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#include <Kernel/Devices/ConsoleDevice.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Sections.h>
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#include <Kernel/kstdio.h>
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// Output bytes to kernel debug port 0xE9 (Bochs console). It's very handy.
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#define CONSOLE_OUT_TO_BOCHS_DEBUG_PORT
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static Kernel::Spinlock g_console_lock;
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UNMAP_AFTER_INIT NonnullRefPtr<ConsoleDevice> ConsoleDevice::must_create()
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{
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auto device_or_error = DeviceManagement::try_create_device<ConsoleDevice>();
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VERIFY(!device_or_error.is_error());
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return device_or_error.release_value();
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}
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UNMAP_AFTER_INIT ConsoleDevice::ConsoleDevice()
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: CharacterDevice(5, 1)
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{
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}
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UNMAP_AFTER_INIT ConsoleDevice::~ConsoleDevice() = default;
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bool ConsoleDevice::can_read(const Kernel::OpenFileDescription&, u64) const
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{
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return false;
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}
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ErrorOr<size_t> ConsoleDevice::read(OpenFileDescription&, u64, Kernel::UserOrKernelBuffer&, 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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ErrorOr<size_t> ConsoleDevice::write(OpenFileDescription&, u64, const Kernel::UserOrKernelBuffer& data, size_t size)
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{
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if (!size)
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return 0;
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return data.read_buffered<256>(size, [&](ReadonlyBytes readonly_bytes) {
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for (const auto& byte : readonly_bytes)
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put_char(byte);
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return readonly_bytes.size();
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});
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}
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void ConsoleDevice::put_char(char ch)
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{
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Kernel::SpinlockLocker lock(g_console_lock);
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#ifdef CONSOLE_OUT_TO_BOCHS_DEBUG_PORT
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IO::out8(IO::BOCHS_DEBUG_PORT, ch);
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#endif
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m_logbuffer.enqueue(ch);
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}
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