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      1 /*	$NetBSD: dtrace_vtime.c,v 1.3 2018/05/28 21:05:03 chs Exp $	*/
      2 
      3 /*
      4  * CDDL HEADER START
      5  *
      6  * The contents of this file are subject to the terms of the
      7  * Common Development and Distribution License (the "License").
      8  * You may not use this file except in compliance with the License.
      9  *
     10  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     11  * or http://www.opensolaris.org/os/licensing.
     12  * See the License for the specific language governing permissions
     13  * and limitations under the License.
     14  *
     15  * When distributing Covered Code, include this CDDL HEADER in each
     16  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     17  * If applicable, add the following below this CDDL HEADER, with the
     18  * fields enclosed by brackets "[]" replaced with your own identifying
     19  * information: Portions Copyright [yyyy] [name of copyright owner]
     20  *
     21  * CDDL HEADER END
     22  *
     23  * $FreeBSD: head/sys/cddl/dev/dtrace/dtrace_vtime.c 179237 2008-05-23 05:59:42Z jb $
     24  */
     25 
     26 /*
     27  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     28  * Use is subject to license terms.
     29  */
     30 
     31 void
     32 dtrace_vtime_enable(void)
     33 {
     34 	dtrace_vtime_state_t state, nstate = 0;
     35 
     36 	do {
     37 		state = dtrace_vtime_active;
     38 
     39 		switch (state) {
     40 		case DTRACE_VTIME_INACTIVE:
     41 			nstate = DTRACE_VTIME_ACTIVE;
     42 			break;
     43 
     44 		case DTRACE_VTIME_INACTIVE_TNF:
     45 			nstate = DTRACE_VTIME_ACTIVE_TNF;
     46 			break;
     47 
     48 		case DTRACE_VTIME_ACTIVE:
     49 		case DTRACE_VTIME_ACTIVE_TNF:
     50 			panic("DTrace virtual time already enabled");
     51 			/*NOTREACHED*/
     52 		}
     53 
     54 	} while	(dtrace_cas32((uint32_t *)&dtrace_vtime_active,
     55 	    state, nstate) != state);
     56 }
     57 
     58 void
     59 dtrace_vtime_disable(void)
     60 {
     61 	dtrace_vtime_state_t state, nstate = 0;
     62 
     63 	do {
     64 		state = dtrace_vtime_active;
     65 
     66 		switch (state) {
     67 		case DTRACE_VTIME_ACTIVE:
     68 			nstate = DTRACE_VTIME_INACTIVE;
     69 			break;
     70 
     71 		case DTRACE_VTIME_ACTIVE_TNF:
     72 			nstate = DTRACE_VTIME_INACTIVE_TNF;
     73 			break;
     74 
     75 		case DTRACE_VTIME_INACTIVE:
     76 		case DTRACE_VTIME_INACTIVE_TNF:
     77 			panic("DTrace virtual time already disabled");
     78 			/*NOTREACHED*/
     79 		}
     80 
     81 	} while	(dtrace_cas32((uint32_t *)&dtrace_vtime_active,
     82 	    state, nstate) != state);
     83 }
     84 
     85 void
     86 dtrace_vtime_switch(kthread_t *next)
     87 {
     88 	dtrace_icookie_t cookie;
     89 	hrtime_t ts;
     90 
     91 	cookie = dtrace_interrupt_disable();
     92 	ts = dtrace_gethrtime();
     93 
     94 	if (curthread->t_dtrace_start != 0) {
     95 		curthread->t_dtrace_vtime += ts - curthread->t_dtrace_start;
     96 		curthread->t_dtrace_start = 0;
     97 	}
     98 
     99 	if (next != NULL)
    100 		next->t_dtrace_start = ts;
    101 
    102 	dtrace_interrupt_enable(cookie);
    103 }
    104