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Kernel: Introduce the DeviceManagement singleton
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.
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43 changed files with 244 additions and 123 deletions
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@ -19,6 +19,8 @@ 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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@ -32,10 +34,9 @@ public:
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virtual ~FramebufferDevice() {};
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KResult initialize();
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// FIXME: We expose this constructor to make try_create_device helper to work
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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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private:
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// ^File
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virtual StringView class_name() const override { return "FramebufferDevice"; }
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