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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/RandomDevice.h>
#include <Kernel/Random.h>
#include <Kernel/Sections.h>
namespace Kernel {
UNMAP_AFTER_INIT NonnullRefPtr<RandomDevice> RandomDevice::must_create()
{
auto random_device_or_error = DeviceManagement::try_create_device<RandomDevice>();
// FIXME: Find a way to propagate errors
VERIFY(!random_device_or_error.is_error());
return random_device_or_error.release_value();
}
UNMAP_AFTER_INIT RandomDevice::RandomDevice()
: CharacterDevice(1, 8)
{
}
UNMAP_AFTER_INIT RandomDevice::~RandomDevice() = default;
bool RandomDevice::can_read(const OpenFileDescription&, u64) const
{
return true;
}
ErrorOr<size_t> RandomDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
return buffer.write_buffered<256>(size, [&](Bytes bytes) {
get_good_random_bytes(bytes);
return bytes.size();
});
}
ErrorOr<size_t> RandomDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
{
// FIXME: Use input for entropy? I guess that could be a neat feature?
return size;
}
}
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