extern unsigned int cpu_khz;
extern unsigned int tsc_khz;
+extern void disable_TSC(void);
+
static inline cycles_t get_cycles(void)
{
unsigned long long ret = 0;
if (!cpu_has_tsc)
return 0;
#endif
-
-#if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC)
rdtscll(ret);
-#endif
+
return ret;
}
-/* Like get_cycles, but make sure the CPU is synchronized. */
-static __always_inline cycles_t get_cycles_sync(void)
+static inline cycles_t vget_cycles(void)
{
- unsigned long long ret;
- unsigned eax, edx;
-
- /*
- * Use RDTSCP if possible; it is guaranteed to be synchronous
- * and doesn't cause a VMEXIT on Hypervisors
- */
- alternative_io(ASM_NOP3, ".byte 0x0f,0x01,0xf9", X86_FEATURE_RDTSCP,
- ASM_OUTPUT2("=a" (eax), "=d" (edx)),
- "a" (0U), "d" (0U) : "ecx", "memory");
- ret = (((unsigned long long)edx) << 32) | ((unsigned long long)eax);
- if (ret)
- return ret;
-
/*
- * Don't do an additional sync on CPUs where we know
- * RDTSC is already synchronous:
+ * We only do VDSOs on TSC capable CPUs, so this shouldnt
+ * access boot_cpu_data (which is not VDSO-safe):
*/
- alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC,
- "=a" (eax), "0" (1) : "ebx","ecx","edx","memory");
- rdtscll(ret);
-
- return ret;
+#ifndef CONFIG_X86_TSC
+ if (!cpu_has_tsc)
+ return 0;
+#endif
+ return (cycles_t) __native_read_tsc();
}
extern void tsc_init(void);
extern void check_tsc_sync_source(int cpu);
extern void check_tsc_sync_target(void);
-#ifdef CONFIG_X86_64
extern void tsc_calibrate(void);
-#endif
+extern int notsc_setup(char *);
#endif