1 /* $OpenBSD: usertc.c,v 1.2 2021/07/24 22:41:09 jca Exp $ */ 2 /* 3 * Copyright (c) 2020 Paul Irofti <paul@irofti.net> 4 * Copyright (c) 2021 Jeremie Courreges-Anglas <jca@wxcvbn.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/timetc.h> 21 22 static inline u_int 23 rdtime(void) 24 { 25 uint64_t ret; 26 27 __asm volatile("rdtime %0" : "=r"(ret)); 28 29 return ret; 30 } 31 32 static int 33 tc_get_timecount(struct timekeep *tk, u_int *tc) 34 { 35 switch (tk->tk_user) { 36 case TC_TB: 37 *tc = rdtime(); 38 return 0; 39 } 40 41 return -1; 42 } 43 44 int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount; 45