1 /* $OpenBSD: usertc.c,v 1.3 2021/07/25 22:58:39 jca Exp $ */ 2 /* 3 * Copyright (c) 2020 Visa Hankala 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 get_cp0_count(void) 23 { 24 uint32_t count; 25 26 __asm volatile ( 27 " .set push\n" 28 " .set mips64r2\n" 29 " rdhwr %0, $2\n" 30 " .set pop\n" 31 : "=r" (count)); 32 33 return count; 34 } 35 36 static int 37 tc_get_timecount(struct timekeep *tk, u_int *tc) 38 { 39 switch (tk->tk_user) { 40 case TC_CP0_COUNT: 41 *tc = get_cp0_count(); 42 return 0; 43 } 44 45 return -1; 46 } 47 48 int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount; 49