mirror of
https://github.com/RGBCube/serenity
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ed6c1f53af
This ensures we safely handle interrupts (which can call virtual functions), so they don't happen in the constructor - this pattern can lead to a crash, if we are still in the constructor context because not all methods are available for usage (some are pure virtual, so it's possible to call __cxa_pure_virtual). Also, under some conditions like adding a PCI device via PCI-passthrough mechanism in QEMU, it became exposed to the eye that the code asserts on RNG::handle_device_config_change(). That device has no configuration but if the hypervisor still misbehaves and tries to configure it, we should simply return false to indicate nothing happened.
39 lines
970 B
C++
39 lines
970 B
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/RefCounted.h>
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#include <Kernel/Bus/VirtIO/Device.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/Random.h>
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namespace Kernel::VirtIO {
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#define REQUESTQ 0
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class RNG final
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: public RefCounted<RNG>
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, public VirtIO::Device {
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public:
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static NonnullRefPtr<RNG> must_create(PCI::Address address);
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virtual StringView purpose() const override { return class_name(); }
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virtual ~RNG() override = default;
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virtual void initialize() override;
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private:
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virtual StringView class_name() const override { return "VirtIOConsole"; }
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explicit RNG(PCI::Address);
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virtual bool handle_device_config_change() override;
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virtual void handle_queue_update(u16 queue_index) override;
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void request_entropy_from_host();
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OwnPtr<Memory::Region> m_entropy_buffer;
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EntropySource m_entropy_source;
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};
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}
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