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https://github.com/SerenityOS/serenity
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bd474dab14
As part of a commit series trying to make the prekernel nicer, we should move and refactor functions out of the init.cpp file if possible.
40 lines
985 B
C++
40 lines
985 B
C++
/*
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* Copyright (c) 2024, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Platform.h>
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#include <Kernel/Boot/Multiboot.h>
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#include <Kernel/Prekernel/Prekernel.h>
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#include <Kernel/Prekernel/Random.h>
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#if ARCH(X86_64)
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# include <Kernel/Arch/x86_64/ASM_wrapper.h>
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# include <Kernel/Arch/x86_64/CPUID.h>
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#endif
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u64 generate_secure_seed()
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{
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u32 seed = 0xFEEBDAED;
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#if ARCH(X86_64)
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Kernel::CPUID processor_info(0x1);
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if (processor_info.edx() & (1 << 4)) // TSC
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seed ^= Kernel::read_tsc();
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if (processor_info.ecx() & (1 << 30)) // RDRAND
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seed ^= Kernel::read_rdrand();
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Kernel::CPUID extended_features(0x7);
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if (extended_features.ebx() & (1 << 18)) // RDSEED
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seed ^= Kernel::read_rdseed();
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#else
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# warning No native randomness source available for this architecture
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#endif
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seed ^= multiboot_info_ptr->mods_addr;
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seed ^= multiboot_info_ptr->framebuffer_addr;
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return seed;
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}
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