1 /* 2 * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE 3 * Copyright 2003 Andi Kleen, SuSE Labs. 4 * 5 * Thanks to hpa@transmeta.com for some useful hint. 6 * Special thanks to Ingo Molnar for his early experience with 7 * a different vsyscall implementation for Linux/IA32 and for the name. 8 */ 9 10 #include <linux/time.h> 11 #include <linux/timekeeper_internal.h> 12 13 #include <asm/vvar.h> 14 15 void update_vsyscall_tz(void) 16 { 17 if (unlikely(vvar_data == NULL)) 18 return; 19 20 vvar_data->tz_minuteswest = sys_tz.tz_minuteswest; 21 vvar_data->tz_dsttime = sys_tz.tz_dsttime; 22 } 23 24 void update_vsyscall(struct timekeeper *tk) 25 { 26 struct vvar_data *vdata = vvar_data; 27 28 if (unlikely(vdata == NULL)) 29 return; 30 31 vvar_write_begin(vdata); 32 vdata->vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode; 33 vdata->clock.cycle_last = tk->tkr_mono.cycle_last; 34 vdata->clock.mask = tk->tkr_mono.mask; 35 vdata->clock.mult = tk->tkr_mono.mult; 36 vdata->clock.shift = tk->tkr_mono.shift; 37 38 vdata->wall_time_sec = tk->xtime_sec; 39 vdata->wall_time_snsec = tk->tkr_mono.xtime_nsec; 40 41 vdata->monotonic_time_sec = tk->xtime_sec + 42 tk->wall_to_monotonic.tv_sec; 43 vdata->monotonic_time_snsec = tk->tkr_mono.xtime_nsec + 44 (tk->wall_to_monotonic.tv_nsec << 45 tk->tkr_mono.shift); 46 47 while (vdata->monotonic_time_snsec >= 48 (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) { 49 vdata->monotonic_time_snsec -= 50 ((u64)NSEC_PER_SEC) << tk->tkr_mono.shift; 51 vdata->monotonic_time_sec++; 52 } 53 54 vdata->wall_time_coarse_sec = tk->xtime_sec; 55 vdata->wall_time_coarse_nsec = 56 (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift); 57 58 vdata->monotonic_time_coarse_sec = 59 vdata->wall_time_coarse_sec + tk->wall_to_monotonic.tv_sec; 60 vdata->monotonic_time_coarse_nsec = 61 vdata->wall_time_coarse_nsec + tk->wall_to_monotonic.tv_nsec; 62 63 while (vdata->monotonic_time_coarse_nsec >= NSEC_PER_SEC) { 64 vdata->monotonic_time_coarse_nsec -= NSEC_PER_SEC; 65 vdata->monotonic_time_coarse_sec++; 66 } 67 68 vvar_write_end(vdata); 69 } 70