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https://github.com/RGBCube/serenity
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aee4786d8e
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.
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/HID/VMWareMouseDevice.h>
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#include <Kernel/Devices/VMWareBackdoor.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT RefPtr<VMWareMouseDevice> VMWareMouseDevice::try_to_initialize(const I8042Controller& ps2_controller)
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{
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if (!VMWareBackdoor::the())
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return {};
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if (!VMWareBackdoor::the()->vmmouse_is_absolute())
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return {};
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auto mouse_device_or_error = DeviceManagement::try_create_device<VMWareMouseDevice>(ps2_controller);
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// FIXME: Find a way to propagate errors
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VERIFY(!mouse_device_or_error.is_error());
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if (mouse_device_or_error.value()->initialize())
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return mouse_device_or_error.release_value();
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return {};
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}
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void VMWareMouseDevice::irq_handle_byte_read(u8)
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{
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VERIFY(VMWareBackdoor::the());
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VERIFY(VMWareBackdoor::the()->vmmouse_is_absolute());
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// We won't receive complete packets with the backdoor enabled,
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// we will only get one byte for each event, which we'll just
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// discard. If we were to wait until we *think* that we got a
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// full PS/2 packet then we would create a backlog in the VM
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// because we wouldn't read the appropriate number of mouse
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// packets from VMWareBackdoor.
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auto mouse_packet = VMWareBackdoor::the()->receive_mouse_packet();
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if (mouse_packet.has_value()) {
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m_entropy_source.add_random_event(mouse_packet.value());
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{
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SpinlockLocker lock(m_queue_lock);
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m_queue.enqueue(mouse_packet.value());
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}
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evaluate_block_conditions();
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}
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return;
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}
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VMWareMouseDevice::VMWareMouseDevice(const I8042Controller& ps2_controller)
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: PS2MouseDevice(ps2_controller)
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{
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}
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VMWareMouseDevice::~VMWareMouseDevice()
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{
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}
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}
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