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Kernel: Introduce the DeviceManagement singleton

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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.
This commit is contained in:
Liav A 2021-09-11 09:19:20 +03:00 • committed by Idan Horowitz
parent 9aa6dd6b78
commit aee4786d8e
43 changed files with 244 additions and 123 deletions
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5
Kernel/Devices/HID/PS2KeyboardDevice.h
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@ -21,6 +21,8 @@ namespace Kernel {
class PS2KeyboardDevice final : public IRQHandler
, public KeyboardDevice
, public I8042Device {
friend class DeviceManagement;
public:
static RefPtr<PS2KeyboardDevice> try_to_initialize(const I8042Controller&);
virtual ~PS2KeyboardDevice() override;
@ -35,10 +37,9 @@ public:
enable_irq();
}
// FIXME: We expose this constructor to make try_create_device helper to work
private:
explicit PS2KeyboardDevice(const I8042Controller&);
private:
// ^IRQHandler
virtual bool handle_irq(const RegisterState&) override;