diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2020-01-21 12:58:52 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-01-22 09:54:18 +0000 |
| commit | 1a50ec0b3b2e9a83f1b1245ea37a853aac2f741c (patch) | |
| tree | 14509c3a940e8c2072ff34ffef36d0c53c9905b6 /arch/arm64/include/uapi | |
| parent | 46cf053efec6a3a5f343fead837777efe8252a46 (diff) | |
arm64: Implement archrandom.h for ARMv8.5-RNG
Expose the ID_AA64ISAR0.RNDR field to userspace, as the RNG system
registers are always available at EL0.
Implement arch_get_random_seed_long using RNDR. Given that the
TRNG is likely to be a shared resource between cores, and VMs,
do not explicitly force re-seeding with RNDRRS. In order to avoid
code complexity and potential issues with hetrogenous systems only
provide values after cpufeature has finalized the system capabilities.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
[Modified to only function after cpufeature has finalized the system
capabilities and move all the code into the header -- broonie]
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
[will: Advertise HWCAP via /proc/cpuinfo]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/uapi')
| -rw-r--r-- | arch/arm64/include/uapi/asm/hwcap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index a1e72886b30c..f192ac33fc76 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -65,5 +65,6 @@ #define HWCAP2_SVESM4 (1 << 6) #define HWCAP2_FLAGM2 (1 << 7) #define HWCAP2_FRINT (1 << 8) +#define HWCAP2_RNG (1 << 9) #endif /* _UAPI__ASM_HWCAP_H */ |