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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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@ -12,6 +12,7 @@
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#include <Kernel/Bus/PCI/API.h>
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#include <Kernel/CommandLine.h>
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#include <Kernel/ConsoleDevice.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/HID/HIDManagement.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FileBackedFileSystem.h>
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@ -640,7 +641,7 @@ private:
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virtual KResult try_generate(KBufferBuilder& builder) override
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{
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JsonArraySerializer array { builder };
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Device::for_each([&array](auto& device) {
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DeviceManagement::the().for_each([&array](auto& device) {
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auto obj = array.add_object();
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obj.add("major", device.major());
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obj.add("minor", device.minor());
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