diff options
Diffstat (limited to 'src/arch/x86/rdrand.c')
| -rw-r--r-- | src/arch/x86/rdrand.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/arch/x86/rdrand.c b/src/arch/x86/rdrand.c index dc7ed60a61..97aabd4ab5 100644 --- a/src/arch/x86/rdrand.c +++ b/src/arch/x86/rdrand.c @@ -38,6 +38,7 @@ static inline uint8_t rdrand_32(uint32_t *rand) return carry; } +#if ENV_X86_64 /* * Generate a 64-bit random number through RDRAND instruction. * Carry flag is set on RDRAND success and 0 on failure. @@ -51,6 +52,7 @@ static inline uint8_t rdrand_64(uint64_t *rand) : "=a" (*rand), "=qm" (carry)); return carry; } +#endif int get_random_number_32(uint32_t *rand) { @@ -71,9 +73,12 @@ int get_random_number_64(uint64_t *rand) /* Perform a loop call until RDRAND succeeds or returns failure. */ for (i = 0; i < RDRAND_RETRY_LOOPS; i++) { - if (ENV_X86_64 && rdrand_64(rand)) +#if ENV_X86_64 + if (rdrand_64(rand)) return 0; - else if (rdrand_32(&rand_high) && rdrand_32(&rand_low)) { + else +#endif + if (rdrand_32(&rand_high) && rdrand_32(&rand_low)) { *rand = ((uint64_t)rand_high << 32) | (uint64_t)rand_low; return 0; |