mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-01-24 02:03:06 -05:00
ecfa7cb824
This patch allocates a physical page for each of the virtqueues and memcpys to it when receiving a buffer to get a physical, aligned contiguous buffer as required by the virtio specification. Co-authored-by: Sahan <sahan.h.fernando@gmail.com>
66 lines
2.6 KiB
C++
66 lines
2.6 KiB
C++
/*
|
|
* 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.characters(); }
|
|
|
|
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 bool handle_device_config_change() override;
|
|
virtual String device_name() const override { return String::formatted("hvc{}", minor()); }
|
|
|
|
OwnPtr<Region> m_receive_region;
|
|
OwnPtr<Region> m_transmit_region;
|
|
};
|
|
|
|
}
|