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https://github.com/RGBCube/serenity
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7718842829
Simplify core methods in the VirtIO bus handling code by ensuring proper error propagation. This makes initialization of queues, handling changes in device configuration, and other core patterns more readable as well. It also allows us to remove the obnoxious pattern of checking for boolean "success" and if we get false answer then returning an actual errno code.
38 lines
998 B
C++
38 lines
998 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/AtomicRefCounted.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/Security/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 AtomicRefCounted<RNG>
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, public VirtIO::Device {
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public:
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static NonnullLockRefPtr<RNG> must_create_for_pci_instance(PCI::DeviceIdentifier const&);
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virtual ~RNG() override = default;
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virtual ErrorOr<void> initialize_virtio_resources() override;
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private:
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virtual StringView class_name() const override { return "VirtIORNG"sv; }
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explicit RNG(NonnullOwnPtr<TransportEntity>);
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virtual ErrorOr<void> 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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