mirror of
https://github.com/RGBCube/serenity
synced 2025-10-28 22:42:06 +00:00
4a9c18afb9
Dr. POSIX really calls these "open file description", not just "file description", so let's call them exactly that. :^)
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) 2021, the SerenityOS developers.
|
|
* Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Bus/VirtIO/Device.h>
|
|
#include <Kernel/Devices/CharacterDevice.h>
|
|
#include <Kernel/FileSystem/OpenFileDescription.h>
|
|
#include <Kernel/Memory/RingBuffer.h>
|
|
|
|
namespace Kernel::VirtIO {
|
|
|
|
class Console;
|
|
|
|
#define VIRTIO_CONSOLE_F_SIZE (1 << 0)
|
|
#define VIRTIO_CONSOLE_F_MULTIPORT (1 << 1)
|
|
#define VIRTIO_CONSOLE_F_EMERG_WRITE (1 << 2)
|
|
|
|
class ConsolePort
|
|
: public CharacterDevice {
|
|
public:
|
|
explicit ConsolePort(unsigned port, VirtIO::Console&);
|
|
void handle_queue_update(Badge<VirtIO::Console>, u16 queue_index);
|
|
|
|
void set_open(Badge<VirtIO::Console>, bool state) { m_open = state; }
|
|
bool is_open() const { return m_open; }
|
|
|
|
private:
|
|
constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
|
|
|
|
virtual StringView class_name() const override { return "VirtIOConsolePort"; }
|
|
|
|
virtual bool can_read(const OpenFileDescription&, size_t) const override;
|
|
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
|
|
virtual bool can_write(const OpenFileDescription&, size_t) const override;
|
|
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
|
|
virtual KResultOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
|
|
|
|
mode_t required_mode() const override { return 0666; }
|
|
|
|
String device_name() const override;
|
|
|
|
void init_receive_buffer();
|
|
|
|
static unsigned next_device_id;
|
|
u16 m_receive_queue {};
|
|
u16 m_transmit_queue {};
|
|
|
|
OwnPtr<Memory::RingBuffer> m_receive_buffer;
|
|
OwnPtr<Memory::RingBuffer> m_transmit_buffer;
|
|
|
|
VirtIO::Console& m_console;
|
|
unsigned m_port;
|
|
|
|
bool m_open { false };
|
|
Atomic<bool> m_receive_buffer_exhausted;
|
|
};
|
|
|
|
}
|