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https://github.com/LadybirdBrowser/ladybird.git
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ed0e7b53a5
Currently, when passing buffers into VirtIOQueues, we use scatter-gather lists, which contain an internal vector of buffers. This vector is allocated, filled and the destroy whenever we try to provide buffers into a virtqueue, which would happen a lot in performance cricital code (the main transport mechanism for certain paravirtualized devices). This commit moves it over to using VirtIOQueueChains and building the chain in place in the VirtIOQueue. Also included are a bunch of fixups for the VirtIO Console device, making it use an internal VM::RingBuffer instead.
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
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 <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/Random.h>
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#include <Kernel/VirtIO/VirtIO.h>
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namespace Kernel {
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#define REQUESTQ 0
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class VirtIORNG final : public CharacterDevice
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, public VirtIODevice {
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public:
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virtual const char* class_name() const override { return m_class_name.characters(); }
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virtual bool can_read(const FileDescription&, size_t) const override { return false; }
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return 0; }
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virtual bool can_write(const FileDescription&, size_t) const override { return false; }
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return 0; }
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virtual mode_t required_mode() const override { return 0666; }
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virtual String device_name() const override { return "hwrng"; }
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VirtIORNG(PCI::Address);
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virtual ~VirtIORNG() override;
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private:
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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<Region> m_entropy_buffer;
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EntropySource m_entropy_source;
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};
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}
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