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We create a base class called GenericFramebufferDevice, which defines all the virtual functions that must be implemented by a FramebufferDevice. Then, we make the VirtIO FramebufferDevice and other FramebufferDevice implementations inherit from it. The most important consequence of rearranging the classes is that we now have one IOCTL method, so all drivers should be committed to not override the IOCTL method or make their own IOCTLs of FramebufferDevice. All graphical IOCTLs are known to all FramebufferDevices, and it's up to the specific implementation whether to support them or discard them (so we require extensive usage of KResult and KResultOr, together with virtual characteristic functions). As a result, the interface is much cleaner and understandable to read.
75 lines
2.8 KiB
C++
75 lines
2.8 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/Graphics/GenericFramebufferDevice.h>
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#include <Kernel/Graphics/GenericGraphicsAdapter.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 final : public GenericFramebufferDevice {
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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 GenericGraphicsAdapter&, PhysicalAddress, size_t, size_t, size_t);
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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() override;
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virtual void activate_writes() override;
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virtual KResult try_to_initialize() override;
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virtual bool multihead_support() const override { return false; }
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virtual bool flushing_support() const override { return false; }
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virtual bool partial_flushing_support() const override { return false; }
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virtual size_t heads_count() const override { return 1; }
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virtual KResultOr<size_t> buffer_length(size_t head) const override;
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virtual KResultOr<size_t> pitch(size_t head) const override;
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virtual KResultOr<size_t> height(size_t head) const override;
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virtual KResultOr<size_t> width(size_t head) const override;
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virtual KResultOr<size_t> vertical_offset(size_t head) const override;
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virtual KResultOr<bool> vertical_offseted(size_t head) const override;
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private:
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virtual KResult set_head_resolution(size_t head, size_t width, size_t height, size_t pitch) override;
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virtual KResult set_head_buffer(size_t head, bool second_buffer) override;
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virtual KResult flush_head_buffer(size_t head) override;
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virtual KResult flush_rectangle(size_t head, FBRect const&) override;
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FramebufferDevice(const GenericGraphicsAdapter&, PhysicalAddress, size_t, size_t, size_t);
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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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mutable Mutex m_buffer_offset_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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};
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}
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