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| author | H. Peter Anvin <hpa@zytor.com> | 2011-07-31 14:02:19 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2011-07-31 14:02:19 -0700 |
| commit | 49d859d78c5aeb998b6936fcb5f288f78d713489 (patch) | |
| tree | 04b7746d1b79ab12bf94ff1eaf9ab91e74db37ef /arch/x86/include | |
| parent | 628c6246d47b85f5357298601df2444d7f4dd3fd (diff) | |
| download | linux-stable-49d859d78c5aeb998b6936fcb5f288f78d713489.tar.gz linux-stable-49d859d78c5aeb998b6936fcb5f288f78d713489.tar.bz2 linux-stable-49d859d78c5aeb998b6936fcb5f288f78d713489.zip | |
x86, random: Verify RDRAND functionality and allow it to be disabled
If the CPU declares that RDRAND is available, go through a guranteed
reseed sequence, and make sure that it is actually working (producing
data.) If it does not, disable the CPU feature flag.
Allow RDRAND to be disabled on the command line (as opposed to at
compile time) for a user who has special requirements with regards to
random numbers.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/archrandom.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/archrandom.h b/arch/x86/include/asm/archrandom.h index b7b5bc02e361..0d9ec770f2f8 100644 --- a/arch/x86/include/asm/archrandom.h +++ b/arch/x86/include/asm/archrandom.h @@ -70,4 +70,6 @@ GET_RANDOM(arch_get_random_int, unsigned int, RDRAND_INT, ASM_NOP3); #endif /* CONFIG_ARCH_RANDOM */ +extern void x86_init_rdrand(struct cpuinfo_x86 *c); + #endif /* ASM_X86_ARCHRANDOM_H */ |