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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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@ -48,6 +48,7 @@ set(KERNEL_SOURCES
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Devices/BlockDevice.cpp
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Devices/CharacterDevice.cpp
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Devices/Device.cpp
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Devices/DeviceManagement.cpp
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Devices/FullDevice.cpp
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Devices/KCOVDevice.cpp
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Devices/KCOVInstance.cpp
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