X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=arch%2Farch-x86-common.h;h=5140f238fb78557d20e176d6160b72a7a4a97334;hb=632b28a93154cb1be203d911f758d5932c0a8f86;hp=d533d22d536bce1ffbc162a1cdb50af1ae4f3848;hpb=267339ff794d41af0f3714483c7ab75985d8a85f;p=fio.git

diff --git a/arch/arch-x86-common.h b/arch/arch-x86-common.h
index d533d22d..5140f238 100644
--- a/arch/arch-x86-common.h
+++ b/arch/arch-x86-common.h
@@ -1,18 +1,23 @@
 #ifndef FIO_ARCH_X86_COMMON
 #define FIO_ARCH_X86_COMMON
 
-static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
-			    unsigned int *ecx, unsigned int *edx)
+#include <string.h>
+
+static inline void cpuid(unsigned int op,
+			 unsigned int *eax, unsigned int *ebx,
+			 unsigned int *ecx, unsigned int *edx)
 {
-	asm volatile("cpuid"
-		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
-		: "0" (*eax), "2" (*ecx)
-		: "memory");
+	*eax = op;
+	*ecx = 0;
+	do_cpuid(eax, ebx, ecx, edx);
 }
 
 #define ARCH_HAVE_INIT
-extern int tsc_reliable;
-static inline int arch_init(char *envp[])
+
+extern bool tsc_reliable;
+extern int arch_random;
+
+static inline void arch_init_intel(void)
 {
 	unsigned int eax, ebx, ecx = 0, edx;
 
@@ -22,15 +27,51 @@ static inline int arch_init(char *envp[])
 	eax = 1;
 	do_cpuid(&eax, &ebx, &ecx, &edx);
 	if (!(edx & (1U << 4)))
-		return 0;
+		return;
 
 	/*
 	 * Check for constant rate and synced (across cores) TSC
 	 */
 	eax = 0x80000007;
 	do_cpuid(&eax, &ebx, &ecx, &edx);
-	tsc_reliable = edx & (1U << 8);
-	return 0;
+	tsc_reliable = (edx & (1U << 8)) != 0;
+
+	/*
+	 * Check for FDRAND
+	 */
+	eax = 0x1;
+	do_cpuid(&eax, &ebx, &ecx, &edx);
+	arch_random = (ecx & (1U << 30)) != 0;
+}
+
+static inline void arch_init_amd(void)
+{
+	unsigned int eax, ebx, ecx, edx;
+
+	cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
+	if (eax < 0x80000007)
+		return;
+
+	cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
+	tsc_reliable = (edx & (1U << 8)) != 0;
+}
+
+static inline void arch_init(char *envp[])
+{
+	unsigned int level;
+	char str[13];
+
+	arch_random = tsc_reliable = 0;
+
+	cpuid(0, &level, (unsigned int *) &str[0],
+			 (unsigned int *) &str[8],
+			 (unsigned int *) &str[4]);
+
+	str[12] = '\0';
+	if (!strcmp(str, "GenuineIntel"))
+		arch_init_intel();
+	else if (!strcmp(str, "AuthenticAMD"))
+		arch_init_amd();
 }
 
 #endif