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70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
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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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#include <Kernel/Arch/i386/CPU.h>
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#include <Kernel/Devices/RandomDevice.h>
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#include <Kernel/Random.h>
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namespace Kernel {
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static KernelRng* s_the;
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KernelRng& KernelRng::the()
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{
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if (!s_the) {
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s_the = new KernelRng;
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}
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return *s_the;
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}
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KernelRng::KernelRng()
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{
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if (g_cpu_supports_rdrand) {
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for (size_t i = 0; i < KernelRng::pool_count * KernelRng::reseed_threshold; ++i) {
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u32 value = 0;
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asm volatile(
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"1:\n"
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"rdseed %0\n"
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"jnc 1b\n"
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: "=r"(value));
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this->add_random_event(value, i % 32);
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}
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}
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}
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void get_good_random_bytes(u8* buffer, size_t buffer_size)
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{
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KernelRng::the().get_random_bytes(buffer, buffer_size);
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}
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void get_fast_random_bytes(u8* buffer, size_t buffer_size)
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{
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return get_good_random_bytes(buffer, buffer_size);
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}
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}
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