db268efa69
When mmaping a Framebuffer from userspace, we need to check whether the framebuffer device is actually enabled (e.g. graphical mode is being used) or a textual VirtualConsole is active. Considering the above state, we mmap the right VMObject to ensure we don't have graphical artifacts if we change the resolution from DisplaySettings, changed to textual mode and after the resolution change was reverted, we will see the Desktop reappearing even though we are still in textual mode.
68 lines
2.4 KiB
C++
68 lines
2.4 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/PhysicalAddress.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/VM/AnonymousVMObject.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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public:
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virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override;
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virtual KResultOr<Region*> mmap(Process&, FileDescription&, const Range&, u64 offset, int prot, bool shared) override;
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// ^Device
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virtual mode_t required_mode() const override { return 0660; }
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virtual String device_name() const override;
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virtual void dectivate_writes();
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virtual void activate_writes();
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virtual size_t framebuffer_size_in_bytes() const { return m_framebuffer_pitch * m_framebuffer_height; }
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virtual ~FramebufferDevice() {};
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void initialize();
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protected:
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virtual bool set_resolution(size_t framebuffer_width, size_t framebuffer_height, size_t framebuffer_pitch);
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FramebufferDevice(PhysicalAddress, size_t, size_t, size_t);
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virtual bool can_read(const FileDescription&, size_t) const override final { return true; }
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virtual bool can_write(const FileDescription&, 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(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return -EINVAL; }
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return -EINVAL; }
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protected:
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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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private:
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SpinLock<u8> m_activation_lock;
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RefPtr<AnonymousVMObject> m_real_framebuffer_vmobject;
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RefPtr<AnonymousVMObject> m_swapped_framebuffer_vmobject;
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OwnPtr<Region> m_real_framebuffer_region;
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OwnPtr<Region> m_swapped_framebuffer_region;
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bool m_graphical_writes_enabled { true };
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RefPtr<AnonymousVMObject> m_userspace_real_framebuffer_vmobject;
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Region* m_userspace_framebuffer_region { nullptr };
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};
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}
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