Messages in this thread Patch in this message | | | From | Mark Rutland <> | Subject | [PATCH 3/4] arm64: add credited/trusted RNG support | Date | Mon, 10 Feb 2020 13:00:14 +0000 |
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Currently arm64 doesn't initialize the primary CRNG in a (potentially) trusted manner as we only detect the presence of the RNG once secondary CPUs are up.
Now that the core RNG code distinguishes the early initialization of the primary CRNG, we can implement arch_get_random_seed_long_early() to support this.
This patch does so.
Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Brown <broonie@kernel.org> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Will Deacon <will@kernel.org> --- arch/arm64/include/asm/archrandom.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/arch/arm64/include/asm/archrandom.h b/arch/arm64/include/asm/archrandom.h index 3fe02da70004..fc1594a0710e 100644 --- a/arch/arm64/include/asm/archrandom.h +++ b/arch/arm64/include/asm/archrandom.h @@ -4,6 +4,8 @@ #ifdef CONFIG_ARCH_RANDOM +#include <linux/bug.h> +#include <linux/kernel.h> #include <linux/random.h> #include <asm/cpufeature.h> @@ -66,6 +68,18 @@ static inline bool __init __early_cpu_has_rndr(void) return (ftr >> ID_AA64ISAR0_RNDR_SHIFT) & 0xf; } +static inline bool __init __must_check +arch_get_random_seed_long_early(unsigned long *v) +{ + WARN_ON(system_state != SYSTEM_BOOTING); + + if (!__early_cpu_has_rndr()) + return false; + + return __arm64_rndr(v); +} +#define arch_get_random_seed_long_early arch_get_random_seed_long_early + #else static inline bool __arm64_rndr(unsigned long *v) { return false; } -- 2.11.0
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