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https://github.com/RGBCube/serenity
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009feefee0
Devices might be removed and inserted at anytime, so let's ensure we always do these kind of operations with a good known state of the HashMap. The VirtIO code was modified to create devices outside the IRQ handler, so now it works with the new locking of the devices singleton, but a better approach might be needed later on.
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"; }
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual KResultOr<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 KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<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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