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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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3
Kernel/GlobalProcessExposed.cpp
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@ -12,6 +12,7 @@
#include <Kernel/Bus/PCI/API.h>
#include <Kernel/CommandLine.h>
#include <Kernel/ConsoleDevice.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/HID/HIDManagement.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/FileBackedFileSystem.h>
@ -640,7 +641,7 @@ private:
virtual KResult try_generate(KBufferBuilder& builder) override
{
JsonArraySerializer array { builder };
Device::for_each([&array](auto& device) {
DeviceManagement::the().for_each([&array](auto& device) {
auto obj = array.add_object();
obj.add("major", device.major());
obj.add("minor", device.minor());