- alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC,
- "=a" (eax), "0" (1) : "ebx","ecx","edx","memory");
-
- return 0;
-}
-
-static __always_inline cycles_t get_cycles_sync(void)
-{
- unsigned long long ret;
- ret = __get_cycles_sync();
- if (!ret)
- rdtscll(ret);
- return ret;
-}
-
-#ifdef CONFIG_PARAVIRT
-/*
- * For paravirt guests, some functionalities are executed through function
- * pointers in the various pvops structures.
- * These function pointers exist inside the kernel and can not
- * be accessed by user space. To avoid this, we make a copy of the
- * get_cycles_sync (called in kernel) but force the use of native_read_tsc.
- * Ideally, the guest should set up it's own clock and vread
- */
-static __always_inline long long vget_cycles_sync(void)
-{
- unsigned long long ret;
- ret = __get_cycles_sync();
- if (!ret)
- ret = native_read_tsc();
- return ret;
-}
-#else
-# define vget_cycles_sync() get_cycles_sync()