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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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9
Kernel/Devices/SerialDevice.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/SerialDevice.h>
#include <Kernel/IO.h>
#include <Kernel/Sections.h>
@ -23,19 +24,19 @@ UNMAP_AFTER_INIT NonnullRefPtr<SerialDevice> SerialDevice::must_create(size_t co
RefPtr<SerialDevice> serial_device;
switch (com_number) {
case 0: {
serial_device = try_create_device<SerialDevice>(IOAddress(SERIAL_COM1_ADDR), 64).release_value();
serial_device = DeviceManagement::try_create_device<SerialDevice>(IOAddress(SERIAL_COM1_ADDR), 64).release_value();
break;
}
case 1: {
serial_device = try_create_device<SerialDevice>(IOAddress(SERIAL_COM2_ADDR), 65).release_value();
serial_device = DeviceManagement::try_create_device<SerialDevice>(IOAddress(SERIAL_COM2_ADDR), 65).release_value();
break;
}
case 2: {
serial_device = try_create_device<SerialDevice>(IOAddress(SERIAL_COM3_ADDR), 66).release_value();
serial_device = DeviceManagement::try_create_device<SerialDevice>(IOAddress(SERIAL_COM3_ADDR), 66).release_value();
break;
}
case 3: {
serial_device = try_create_device<SerialDevice>(IOAddress(SERIAL_COM4_ADDR), 67).release_value();
serial_device = DeviceManagement::try_create_device<SerialDevice>(IOAddress(SERIAL_COM4_ADDR), 67).release_value();
break;
}
default: