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
22 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 void
dtrace_vtime_enable(void)28 dtrace_vtime_enable(void)
29 {
30 dtrace_vtime_state_t state, nstate = 0;
31
32 do {
33 state = dtrace_vtime_active;
34
35 switch (state) {
36 case DTRACE_VTIME_INACTIVE:
37 nstate = DTRACE_VTIME_ACTIVE;
38 break;
39
40 case DTRACE_VTIME_INACTIVE_TNF:
41 nstate = DTRACE_VTIME_ACTIVE_TNF;
42 break;
43
44 case DTRACE_VTIME_ACTIVE:
45 case DTRACE_VTIME_ACTIVE_TNF:
46 panic("DTrace virtual time already enabled");
47 /*NOTREACHED*/
48 }
49
50 } while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
51 state, nstate) != state);
52 }
53
54 void
dtrace_vtime_disable(void)55 dtrace_vtime_disable(void)
56 {
57 dtrace_vtime_state_t state, nstate = 0;
58
59 do {
60 state = dtrace_vtime_active;
61
62 switch (state) {
63 case DTRACE_VTIME_ACTIVE:
64 nstate = DTRACE_VTIME_INACTIVE;
65 break;
66
67 case DTRACE_VTIME_ACTIVE_TNF:
68 nstate = DTRACE_VTIME_INACTIVE_TNF;
69 break;
70
71 case DTRACE_VTIME_INACTIVE:
72 case DTRACE_VTIME_INACTIVE_TNF:
73 panic("DTrace virtual time already disabled");
74 /*NOTREACHED*/
75 }
76
77 } while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
78 state, nstate) != state);
79 }
80
81 void
dtrace_vtime_switch(kthread_t * next)82 dtrace_vtime_switch(kthread_t *next)
83 {
84 dtrace_icookie_t cookie;
85 hrtime_t ts;
86
87 cookie = dtrace_interrupt_disable();
88 ts = dtrace_gethrtime();
89
90 if (curthread->t_dtrace_start != 0) {
91 curthread->t_dtrace_vtime += ts - curthread->t_dtrace_start;
92 curthread->t_dtrace_start = 0;
93 }
94
95 if (next != NULL)
96 next->t_dtrace_start = ts;
97
98 dtrace_interrupt_enable(cookie);
99 }
100