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aee4786d8e
This singleton simplifies many aspects that we struggled with before: 1. There's no need to make derived classes of Device expose the constructor as public anymore. The singleton is a friend of them, so he can call the constructor. This solves the issue with try_create_device helper neatly, hopefully for good. 2. Getting a reference of the NullDevice is now being done from this singleton, which means that NullDevice no longer needs to use its own singleton, and we can apply the try_create_device helper on it too :) 3. We can now defer registration completely after the Device constructor which means the Device constructor is merely assigning the major and minor numbers of the Device, and the try_create_device helper ensures it calls the after_inserting method immediately after construction. This creates a great opportunity to make registration more OOM-safe.
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/NonnullOwnPtr.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/Graphics/GraphicsDevice.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel {
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class FramebufferDevice : public BlockDevice {
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AK_MAKE_ETERNAL
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friend class DeviceManagement;
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public:
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static NonnullRefPtr<FramebufferDevice> create(const GraphicsDevice&, size_t, PhysicalAddress, size_t, size_t, size_t);
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virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
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virtual KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
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virtual void deactivate_writes();
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virtual void activate_writes();
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size_t framebuffer_size_in_bytes() const;
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virtual ~FramebufferDevice() {};
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KResult initialize();
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private:
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FramebufferDevice(const GraphicsDevice&, size_t, PhysicalAddress, size_t, size_t, size_t);
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// ^File
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virtual StringView class_name() const override { return "FramebufferDevice"; }
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virtual bool can_read(const OpenFileDescription&, size_t) const override final { return true; }
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virtual bool can_write(const OpenFileDescription&, size_t) const override final { return true; }
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virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
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virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
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PhysicalAddress m_framebuffer_address;
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size_t m_framebuffer_pitch { 0 };
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size_t m_framebuffer_width { 0 };
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size_t m_framebuffer_height { 0 };
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Spinlock m_activation_lock;
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RefPtr<Memory::AnonymousVMObject> m_real_framebuffer_vmobject;
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RefPtr<Memory::AnonymousVMObject> m_swapped_framebuffer_vmobject;
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OwnPtr<Memory::Region> m_real_framebuffer_region;
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OwnPtr<Memory::Region> m_swapped_framebuffer_region;
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bool m_graphical_writes_enabled { true };
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RefPtr<Memory::AnonymousVMObject> m_userspace_real_framebuffer_vmobject;
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Memory::Region* m_userspace_framebuffer_region { nullptr };
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size_t m_y_offset { 0 };
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size_t m_output_port_index;
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NonnullRefPtr<GraphicsDevice> m_graphics_adapter;
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};
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}
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