From 7b878d4b48c4e04b936918bb83836a107ba453b3 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Mon, 17 Mar 2014 16:36:30 -0700 Subject: random: Add arch_has_random[_seed]() Add predicate functions for having arch_get_random[_seed]*(). The only current use is to avoid the loop in arch_random_refill() when arch_get_random_seed_long() is unavailable. Signed-off-by: H. Peter Anvin Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Signed-off-by: Theodore Ts'o --- arch/x86/include/asm/archrandom.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86/include/asm/archrandom.h') diff --git a/arch/x86/include/asm/archrandom.h b/arch/x86/include/asm/archrandom.h index 6ad7f6d..69f1366 100644 --- a/arch/x86/include/asm/archrandom.h +++ b/arch/x86/include/asm/archrandom.h @@ -114,6 +114,9 @@ GET_SEED(arch_get_random_seed_int, unsigned int, RDSEED_INT, ASM_NOP4); #endif /* CONFIG_X86_64 */ +#define arch_has_random() static_cpu_has(X86_FEATURE_RDRAND) +#define arch_has_random_seed() static_cpu_has(X86_FEATURE_RDSEED) + #else static inline int rdrand_long(unsigned long *v) -- cgit v1.1