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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
67 lines
1.7 KiB
C++
67 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()
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{
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}
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bool ConsoleDevice::can_read(const Kernel::OpenFileDescription&, size_t) 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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