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Kernel: Add a more expressive API for getting random bytes
We now have these API's in <Kernel/Random.h>: - get_fast_random_bytes(u8* buffer, size_t buffer_size) - get_good_random_bytes(u8* buffer, size_t buffer_size) - get_fast_random<T>() - get_good_random<T>() Internally they both use x86 RDRAND if available, otherwise they fall back to the same LCG we had in RandomDevice all along. The main purpose of this patch is to give kernel code a way to better express its needs for random data. Randomness is something that will require a lot more work, but this is hopefully a step in the right direction.
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11 changed files with 87 additions and 48 deletions
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@ -524,6 +524,7 @@ void sse_init()
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bool g_cpu_supports_nx;
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bool g_cpu_supports_pae;
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bool g_cpu_supports_pge;
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bool g_cpu_supports_rdrand;
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bool g_cpu_supports_smep;
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bool g_cpu_supports_sse;
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bool g_cpu_supports_tsc;
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@ -536,6 +537,7 @@ void detect_cpu_features()
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g_cpu_supports_pge = (processor_info.edx() & (1 << 13));
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g_cpu_supports_sse = (processor_info.edx() & (1 << 25));
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g_cpu_supports_tsc = (processor_info.edx() & (1 << 4));
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g_cpu_supports_rdrand = (processor_info.ecx() & (1 << 30));
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CPUID extended_processor_info(0x80000001);
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g_cpu_supports_nx = (extended_processor_info.edx() & (1 << 20));
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