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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Random.h>
#include <Kernel/VirtIO/VirtIO.h>
namespace Kernel {
#define REQUESTQ 0
class VirtIORNG final : public CharacterDevice
, public VirtIODevice {
public:
virtual StringView purpose() const override { return class_name(); }
virtual StringView class_name() const override { return m_class_name; }
virtual bool can_read(const FileDescription&, size_t) const override { return false; }
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override { return 0; }
virtual bool can_write(const FileDescription&, size_t) const override { return false; }
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return 0; }
virtual mode_t required_mode() const override { return 0666; }
virtual String device_name() const override { return "hwrng"; }
VirtIORNG(PCI::Address);
virtual ~VirtIORNG() override;
private:
virtual bool handle_device_config_change() override;
virtual void handle_queue_update(u16 queue_index) override;
void request_entropy_from_host();
OwnPtr<Memory::Region> m_entropy_buffer;
EntropySource m_entropy_source;
};
}
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