X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=arch%2Farch-x86_64.h;h=8f33fc541ee6f266e96f9f507ccc3782d618392c;hb=c73b19534c73a4c42a531c71a9de3bea59d84477;hp=d7ea12e0d0723d6e8c8d9d9671cc3ab151d5645b;hpb=6a79a4cbe0c9c9a72a1064b55fdefbcb6257942d;p=fio.git

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index d7ea12e0..8f33fc54 100644
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -5,7 +5,7 @@ static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
 			    unsigned int *ecx, unsigned int *edx)
 {
 	asm volatile("cpuid"
-		: "=a" (*eax), "=b" (*ebx), "=r" (*ecx), "=d" (*edx)
+		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
 		: "0" (*eax), "2" (*ecx)
 		: "memory");
 }
@@ -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