X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=arch%2Farch-x86_64.h;h=8f33fc541ee6f266e96f9f507ccc3782d618392c;hb=16dc07107d2abddccf7e42f684c16c3d8657b324;hp=61ac75eefef97a64423cecbef4eff32c2b7199ff;hpb=68d96e515825185b232bbc8d2e5b5136b90514be;p=fio.git

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index 61ac75ee..8f33fc54 100644
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -60,4 +60,34 @@ static inline unsigned long long get_cpu_clock(void)
 #define ARCH_HAVE_SSE4_2
 #define ARCH_HAVE_CPU_CLOCK
 
+#define RDRAND_LONG	".byte 0x48,0x0f,0xc7,0xf0"
+#define RDSEED_LONG	".byte 0x48,0x0f,0xc7,0xf8"
+#define RDRAND_RETRY	100
+
+static inline int arch_rand_long(unsigned long *val)
+{
+	int ok;
+
+	asm volatile("1: " RDRAND_LONG "\n\t"
+		     "jc 2f\n\t"
+		     "decl %0\n\t"
+		     "jnz 1b\n\t"
+		     "2:"
+		     : "=r" (ok), "=a" (*val)
+		     : "0" (RDRAND_RETRY));
+
+	return ok;
+}
+
+static inline int arch_rand_seed(unsigned long *seed)
+{
+	unsigned char ok;
+
+	asm volatile(RDSEED_LONG "\n\t"
+			"setc %0"
+			: "=qm" (ok), "=a" (*seed));
+
+	return 0;
+}
+
 #endif