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