RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 07:57:46 +00:00
Code Issues Activity Actions

Kernel: Add base support for VirtConsole (VirtIO based consoles)

Browse source 
Based on pull #3236 by tomuta, this is still very much WIP but will
eventually allow us to switch from the considerably slower method of
knocking on port 0xe9 for each character

Co-authored-by: Tom <tomut@yahoo.com>
Co-authored-by: Sahan <sahan.h.fernando@gmail.com>
This commit is contained in:
Idan Horowitz 2021-01-02 19:56:36 +02:00 • committed by Andreas Kling
parent 62303d46d1
commit ea4c9efbb9
4 changed files with 191 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

66
Kernel/VirtIO/VirtIOConsole.h Normal file
View file

@ -0,0 +1,66 @@
/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/VirtIO/VirtIO.h>
namespace Kernel {
#define VIRTIO_CONSOLE_PCI_DEVICE_ID 0x1003
#define VIRTIO_CONSOLE_F_SIZE (1 << 0)
#define VIRTIO_CONSOLE_F_MULTIPORT (1 << 1)
#define VIRTIO_CONSOLE_F_EMERG_WRITE (1 << 2)
#define RECEIVEQ 0
#define TRANSMITQ 1
class VirtIOConsole final : public CharacterDevice
, public VirtIODevice {
public:
VirtIOConsole(PCI::Address);
virtual ~VirtIOConsole() override;
private:
virtual const char* class_name() const override { return m_class_name; }
virtual bool can_read(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual mode_t required_mode() const override { return 0666; }
virtual void handle_device_config_change() override;
virtual String device_name() const override { return String::formatted("hvc{}", minor()); }
VirtIOQueue* m_receive_queue { nullptr };
VirtIOQueue* m_send_queue { nullptr };
};
}