1 /* $OpenBSD: usertc.c,v 1.2 2020/07/08 09:20:28 kettenis Exp $ */ 2 /* 3 * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <sys/timetc.h> 20 21 static inline u_int 22 tick_get_timecount(struct timecounter *tc) 23 { 24 u_int64_t tick; 25 26 __asm volatile("rd %%tick, %0" : "=r" (tick)); 27 28 return (tick & ~0u); 29 } 30 31 static inline u_int 32 sys_tick_get_timecount(struct timecounter *tc) 33 { 34 u_int64_t tick; 35 36 __asm volatile("rd %%sys_tick, %0" : "=r" (tick)); 37 38 return (tick & ~0u); 39 } 40 41 static int 42 tc_get_timecount(struct timekeep *tk, u_int *tc) 43 { 44 switch (tk->tk_user) { 45 case TC_TICK: 46 *tc = tick_get_timecount(NULL); 47 return 0; 48 case TC_SYS_TICK: 49 *tc = sys_tick_get_timecount(NULL); 50 return 0; 51 } 52 53 return -1; 54 } 55 56 int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount; 57