mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 07:58:11 +00:00
9a04f53a0f
It's easy to forget the responsibility of validating and safely copying kernel parameters in code that is far away from syscalls. ioctl's are one such example, and bugs there are just as dangerous as at the root syscall level. To avoid this case, utilize the AK::Userspace<T> template in the ioctl kernel interface so that implementors have no choice but to properly validate and copy ioctl pointer arguments.
99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
/*
|
|
* Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Devices/BlockDevice.h>
|
|
#include <Kernel/Graphics/VirtIOGPU/GPU.h>
|
|
#include <Kernel/VirtIO/VirtIO.h>
|
|
#include <Kernel/VirtIO/VirtIOQueue.h>
|
|
|
|
namespace Kernel::Graphics::VirtIOGPU {
|
|
|
|
class FrameBufferDevice final : public BlockDevice {
|
|
friend class Console;
|
|
struct Buffer {
|
|
size_t framebuffer_offset { 0 };
|
|
u8* framebuffer_data { nullptr };
|
|
Protocol::Rect dirty_rect {};
|
|
ResourceID resource_id { 0 };
|
|
};
|
|
|
|
public:
|
|
FrameBufferDevice(VirtIOGPU::GPU& virtio_gpu, ScanoutID);
|
|
virtual ~FrameBufferDevice() override;
|
|
|
|
virtual void deactivate_writes();
|
|
virtual void activate_writes();
|
|
|
|
bool try_to_set_resolution(size_t width, size_t height);
|
|
void clear_to_black(Buffer&);
|
|
|
|
size_t width() const { return display_info().rect.width; }
|
|
size_t height() const { return display_info().rect.height; }
|
|
size_t pitch() const { return display_info().rect.width * 4; }
|
|
|
|
static size_t calculate_framebuffer_size(size_t width, size_t height)
|
|
{
|
|
// VirtIO resources can only map on page boundaries!
|
|
return page_round_up(sizeof(u32) * width * height);
|
|
}
|
|
|
|
void flush_dirty_window(Protocol::Rect const&, Buffer&);
|
|
void transfer_framebuffer_data_to_host(Protocol::Rect const&, Buffer&);
|
|
void flush_displayed_image(Protocol::Rect const&, Buffer&);
|
|
|
|
void draw_ntsc_test_pattern(Buffer&);
|
|
|
|
u8* framebuffer_data();
|
|
|
|
private:
|
|
virtual StringView class_name() const override { return "VirtIOFrameBuffer"; }
|
|
|
|
Protocol::DisplayInfoResponse::Display const& display_info() const;
|
|
Protocol::DisplayInfoResponse::Display& display_info();
|
|
|
|
void create_framebuffer();
|
|
void create_buffer(Buffer&, size_t, size_t);
|
|
void set_buffer(int);
|
|
|
|
virtual int ioctl(FileDescription&, unsigned request, Userspace<void*> arg) override;
|
|
virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
|
|
virtual bool can_read(const FileDescription&, size_t) const override { return true; }
|
|
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
|
|
virtual bool can_write(const FileDescription&, size_t) const override { return true; }
|
|
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; };
|
|
virtual void start_request(AsyncBlockDeviceRequest& request) override { request.complete(AsyncDeviceRequest::Failure); }
|
|
|
|
virtual mode_t required_mode() const override { return 0666; }
|
|
virtual String device_name() const override { return String::formatted("fb{}", minor()); }
|
|
|
|
static bool is_valid_buffer_index(int buffer_index)
|
|
{
|
|
return buffer_index == 0 || buffer_index == 1;
|
|
}
|
|
|
|
Buffer& buffer_from_index(int buffer_index)
|
|
{
|
|
return buffer_index == 0 ? m_main_buffer : m_back_buffer;
|
|
}
|
|
Buffer& current_buffer() const { return *m_current_buffer; }
|
|
|
|
GPU& m_gpu;
|
|
const ScanoutID m_scanout;
|
|
Buffer* m_current_buffer { nullptr };
|
|
Atomic<int, AK::memory_order_relaxed> m_last_set_buffer_index { 0 };
|
|
Buffer m_main_buffer;
|
|
Buffer m_back_buffer;
|
|
OwnPtr<Region> m_framebuffer;
|
|
RefPtr<VMObject> m_framebuffer_sink_vmobject;
|
|
size_t m_buffer_size { 0 };
|
|
bool m_are_writes_active { true };
|
|
// FIXME: This needs to be cleaned up if the WindowServer exits while we are in a tty
|
|
WeakPtr<Region> m_userspace_mmap_region;
|
|
};
|
|
|
|
}
|