#define ARCH_HAVE_INIT
extern int tsc_reliable;
+extern int arch_random;
-static inline int arch_init_intel(unsigned int level)
+static inline void arch_init_intel(unsigned int level)
{
unsigned int eax, ebx, ecx = 0, edx;
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);
- return edx & (1U << 8);
+ 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 int arch_init_amd(unsigned int level)
+static inline void arch_init_amd(unsigned int level)
{
unsigned int eax, ebx, ecx, edx;
cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
if (eax < 0x80000007)
- return 0;
+ return;
cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
- if (edx & (1 << 8))
- return 1;
-
- return 0;
+ tsc_reliable = (edx & (1U << 8)) != 0;
}
-static inline int arch_init(char *envp[])
+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"))
- tsc_reliable = arch_init_intel(level);
+ arch_init_intel(level);
else if (!strcmp(str, "AuthenticAMD"))
- tsc_reliable = arch_init_amd(level);
-
- return 0;
+ arch_init_amd(level);
}
#endif
#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