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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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@ -4,6 +4,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/HID/VMWareMouseDevice.h>
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#include <Kernel/Devices/VMWareBackdoor.h>
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#include <Kernel/Sections.h>
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@ -16,7 +17,7 @@ UNMAP_AFTER_INIT RefPtr<VMWareMouseDevice> VMWareMouseDevice::try_to_initialize(
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return {};
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if (!VMWareBackdoor::the()->vmmouse_is_absolute())
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return {};
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auto mouse_device_or_error = try_create_device<VMWareMouseDevice>(ps2_controller);
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auto mouse_device_or_error = DeviceManagement::try_create_device<VMWareMouseDevice>(ps2_controller);
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// FIXME: Find a way to propagate errors
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VERIFY(!mouse_device_or_error.is_error());
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if (mouse_device_or_error.value()->initialize())
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