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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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@ -13,6 +13,7 @@
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#include <Kernel/Bus/VirtIO/Device.h>
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#include <Kernel/CMOS.h>
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#include <Kernel/CommandLine.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/FullDevice.h>
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#include <Kernel/Devices/HID/HIDManagement.h>
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#include <Kernel/Devices/KCOVDevice.h>
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@ -182,7 +183,10 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
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load_kernel_symbol_table();
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DeviceManagement::initialize();
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SysFSComponentRegistry::initialize();
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DeviceManagement::the().attach_null_device(*NullDevice::must_initialize());
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ConsoleDevice::initialize();
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s_bsp_processor.initialize(0);
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@ -281,7 +285,6 @@ void init_stage2(void*)
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VirtualFileSystem::initialize();
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NullDevice::initialize();
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if (!get_serial_debug())
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(void)SerialDevice::must_create(0).leak_ref();
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(void)SerialDevice::must_create(1).leak_ref();
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