kvm-unit-tests/x86/kvmclock.c

18  * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
19  * yielding a 64-bit result.
29 		delta >>= -shift;  in scale_delta()
77 		rem -= (u64) (high*base) << 32;  in __div64_32()
87 			rem -= b;  in __div64_32()
112  * set_normalized_timespec - set timespec sec and nsec parts and normalize
114  * @ts:		pointer to timespec variable to be set
115  * @sec:	seconds to set
116  * @nsec:	nanoseconds to set
119  * normalize to the timespec storage format
134 		nsec -= NSEC_PER_SEC;  in set_normalized_timespec()
140 		--sec;  in set_normalized_timespec()
142 	ts->tv_sec = sec;  in set_normalized_timespec()
143 	ts->tv_nsec = nsec;  in set_normalized_timespec()
149 	unsigned version = src->version & ~1;  in pvclock_read_begin()
150 	/* Make sure that the version is read before the data. */  in pvclock_read_begin()
159 	/* Make sure that the version is re-read after the data. */  in pvclock_read_retry()
161 	return version != src->version;  in pvclock_read_retry()
168 	 * to 2x speedup  in rdtsc_ordered()
177 	u64 delta = rdtsc_ordered() - src->tsc_timestamp;  in __pvclock_read_cycles()
178 	cycle_t offset = scale_delta(delta, src->tsc_to_system_mul,  in __pvclock_read_cycles()
179 					     src->tsc_shift);  in __pvclock_read_cycles()
180 	return src->system_time + offset;  in __pvclock_read_cycles()
193 		flags = src->flags;  in pvclock_clocksource_read()
209 	 * We just need to make sure we are not seeing a backwards event.  in pvclock_clocksource_read()
213 	 * making the assumption that last_value always go forward fail to hold.  in pvclock_clocksource_read()
241         printf("kvm-clock: cpu %d, msr %p\n", index, hvc);  in kvm_clock_init()
260 		version = wall_clock->version;  in pvclock_read_wallclock()
262 		now.tv_sec  = wall_clock->sec;  in pvclock_read_wallclock()
263 		now.tv_nsec = wall_clock->nsec;  in pvclock_read_wallclock()
265 	} while ((wall_clock->version & 1) || (version != wall_clock->version));  in pvclock_read_wallclock()