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e4d9fa914e
This is a very basic implementation that only requests 4096 bytes of entropy from the host once, but its still high quality entropy so it should be a good fix for #4490 (boot-time entropy starvation) for virtualized environments. Co-authored-by: Sahan <sahan.h.fernando@gmail.com>
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 VIRTIO_ENTROPY_PCI_DEVICE_ID 0x1005
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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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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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