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Kernel/riscv64: Use TimeManagement as an entropy source for now

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Better entropy will require us to parse the riscv,isa devicetree
property and then use the Zkr extension, if present.
This commit is contained in:
Sönke Holz 2024-02-22 20:02:19 +01:00 committed by Andrew Kaster
parent f6151b3c9e
commit cd389833d4
Notes: sideshowbarker 2024-07-16 17:05:37 +09:00 
Author: https://github.com/spholz
Commit: https://github.com/SerenityOS/serenity/commit/cd389833d4
Pull-request: https://github.com/SerenityOS/serenity/pull/23314
Reviewed-by: https://github.com/ADKaster ✅
1 changed files with 9 additions and 0 deletions
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9
Kernel/Security/Random.cpp
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@ -77,6 +77,15 @@ UNMAP_AFTER_INIT KernelRng::KernelRng()
current_time += 0x40b2u;
}
}
#elif ARCH(RISCV64)
// Fallback to TimeManagement as entropy
dmesgln("KernelRng: Using bad entropy source TimeManagement");
auto current_time = static_cast<u64>(TimeManagement::now().milliseconds_since_epoch());
for (size_t i = 0; i < pool_count * reseed_threshold; ++i) {
add_random_event(current_time, i % 32);
current_time *= 0x574au;
current_time += 0x40b2u;
}
#else
dmesgln("KernelRng: No entropy source available!");
#endif