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/*
* Copyright (c) 2021, Sahan Fernando <sahan.h.fernando@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Bus/VirtIO/Device.h>
#include <Kernel/Bus/VirtIO/Queue.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Graphics/VirtIOGPU/GPU.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();
KResult 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 Memory::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"sv; }
Protocol::DisplayInfoResponse::Display const& display_info() const;
Protocol::DisplayInfoResponse::Display& display_info();
KResult create_framebuffer();
void create_buffer(Buffer&, size_t, size_t);
void set_buffer(int);
virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
virtual KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
virtual bool can_read(const OpenFileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; };
virtual void start_request(AsyncBlockDeviceRequest& request) override { request.complete(AsyncDeviceRequest::Failure); }
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<Memory::Region> m_framebuffer;
RefPtr<Memory::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<Memory::Region> m_userspace_mmap_region;
};
}
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