mirror of
https://github.com/RGBCube/serenity
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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. :^)
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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* Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <Kernel/Bus/VirtIO/Device.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Memory/RingBuffer.h>
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namespace Kernel::VirtIO {
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class Console;
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#define VIRTIO_CONSOLE_F_SIZE (1 << 0)
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#define VIRTIO_CONSOLE_F_MULTIPORT (1 << 1)
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#define VIRTIO_CONSOLE_F_EMERG_WRITE (1 << 2)
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class ConsolePort
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: public CharacterDevice {
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public:
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explicit ConsolePort(unsigned port, VirtIO::Console&);
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void handle_queue_update(Badge<VirtIO::Console>, u16 queue_index);
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void set_open(Badge<VirtIO::Console>, bool state) { m_open = state; }
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bool is_open() const { return m_open; }
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void init_receive_buffer(Badge<Console>);
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private:
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constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
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virtual StringView class_name() const override { return "VirtIOConsolePort"sv; }
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
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static unsigned next_device_id;
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u16 m_receive_queue {};
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u16 m_transmit_queue {};
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OwnPtr<Memory::RingBuffer> m_receive_buffer;
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OwnPtr<Memory::RingBuffer> m_transmit_buffer;
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VirtIO::Console& m_console;
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unsigned m_port;
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bool m_open { false };
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Atomic<bool> m_receive_buffer_exhausted;
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};
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}
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