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authorH. Peter Anvin <hpa@linux.intel.com>2014-03-17 16:36:30 -0700
committerTheodore Ts'o <tytso@mit.edu>2014-03-19 22:24:08 -0400
commit7b878d4b48c4e04b936918bb83836a107ba453b3 (patch)
tree83df1d702e0162dc7785730356d934b8d59c45e2 /arch
parent331c6490c7f10dcf263712e313b7c0bc7fb6d77a (diff)
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 <hpa@linux.intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/archrandom.h9
-rw-r--r--arch/x86/include/asm/archrandom.h3
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h
index 801beba4e64b..bde531103638 100644
--- a/arch/powerpc/include/asm/archrandom.h
+++ b/arch/powerpc/include/asm/archrandom.h
@@ -25,6 +25,11 @@ static inline int arch_get_random_int(unsigned int *v)
return rc;
}
+static inline int arch_has_random(void)
+{
+ return !!ppc_md.get_random_long;
+}
+
int powernv_get_random_long(unsigned long *v);
static inline int arch_get_random_seed_long(unsigned long *v)
@@ -35,6 +40,10 @@ static inline int arch_get_random_seed_int(unsigned int *v)
{
return 0;
}
+static inline int arch_has_random_seed(void)
+{
+ return 0;
+}
#endif /* CONFIG_ARCH_RANDOM */
diff --git a/arch/x86/include/asm/archrandom.h b/arch/x86/include/asm/archrandom.h
index 6ad7f6d3f97f..69f1366f1aa3 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)