diff options
| author | Andre Przywara <andre.przywara@arm.com> | 2021-01-06 10:34:50 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-01-21 17:42:46 +0000 |
| commit | a37e31fc97efe7f7c68cb381cf4390e472c09061 (patch) | |
| tree | 942a1153458f65a2e67743b87d1e1ec0d381fbae /arch/arm64/include | |
| parent | 67c6bb56b649590a3f59c2a92331aa4e83d4534c (diff) | |
firmware: smccc: Introduce SMCCC TRNG framework
The ARM DEN0098 document describe an SMCCC based firmware service to
deliver hardware generated random numbers. Its existence is advertised
according to the SMCCC v1.1 specification.
Add a (dummy) call to probe functions implemented in each architecture
(ARM and arm64), to determine the existence of this interface.
For now this return false, but this will be overwritten by each
architecture's support patch.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/archrandom.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/archrandom.h b/arch/arm64/include/asm/archrandom.h index ffb1a40d5475..abe07c21da8e 100644 --- a/arch/arm64/include/asm/archrandom.h +++ b/arch/arm64/include/asm/archrandom.h @@ -8,6 +8,11 @@ #include <linux/kernel.h> #include <asm/cpufeature.h> +static inline bool __init smccc_probe_trng(void) +{ + return false; +} + static inline bool __arm64_rndr(unsigned long *v) { bool ok; @@ -79,5 +84,12 @@ arch_get_random_seed_long_early(unsigned long *v) } #define arch_get_random_seed_long_early arch_get_random_seed_long_early +#else /* !CONFIG_ARCH_RANDOM */ + +static inline bool __init smccc_probe_trng(void) +{ + return false; +} + #endif /* CONFIG_ARCH_RANDOM */ #endif /* _ASM_ARCHRANDOM_H */ |