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 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.12 */
31
32 #include <sys/types.h>
33 #include <sys/param.h>
34 #include <sys/sysmacros.h>
35 #include <sys/signal.h>
36 #include <sys/pcb.h>
37 #include <sys/user.h>
38 #include <sys/systm.h>
39 #include <sys/sysinfo.h>
40 #include <sys/var.h>
41 #include <sys/errno.h>
42 #include <sys/cmn_err.h>
43 #include <sys/proc.h>
44 #include <sys/debug.h>
45 #include <sys/inline.h>
46 #include <sys/disp.h>
47 #include <sys/class.h>
48 #include <sys/kmem.h>
49 #include <sys/cpuvar.h>
50 #include <sys/priocntl.h>
51
52 /*
53 * Class specific code for the sys class. There are no
54 * class specific data structures associated with
55 * the sys class and the scheduling policy is trivially
56 * simple. There is no time slicing.
57 */
58
59 pri_t sys_init(id_t, int, classfuncs_t **);
60 static int sys_getclpri(pcpri_t *);
61 static int sys_fork(kthread_t *, kthread_t *, void *);
62 static int sys_enterclass(kthread_t *, id_t, void *, cred_t *, void *);
63 static int sys_canexit(kthread_t *, cred_t *);
64 static int sys_nosys();
65 static int sys_donice(kthread_t *, cred_t *, int, int *);
66 static int sys_doprio(kthread_t *, cred_t *, int, int *);
67 static void sys_forkret(kthread_t *, kthread_t *);
68 static void sys_nullsys();
69 static int sys_alloc(void **, int);
70
71 struct classfuncs sys_classfuncs = {
72 /* messages to class manager */
73 {
74 sys_nosys, /* admin */
75 sys_nosys, /* getclinfo */
76 sys_nosys, /* parmsin */
77 sys_nosys, /* parmsout */
78 sys_nosys, /* vaparmsin */
79 sys_nosys, /* vaparmsout */
80 sys_getclpri, /* getclpri */
81 sys_alloc,
82 sys_nullsys, /* free */
83 },
84 /* operations on threads */
85 {
86 sys_enterclass, /* enterclass */
87 sys_nullsys, /* exitclass */
88 sys_canexit,
89 sys_fork,
90 sys_forkret, /* forkret */
91 sys_nullsys, /* parmsget */
92 sys_nosys, /* parmsset */
93 sys_nullsys, /* stop */
94 sys_nullsys, /* exit */
95 sys_nullsys, /* active */
96 sys_nullsys, /* inactive */
97 sys_nullsys, /* trapret */
98 setfrontdq, /* preempt */
99 setbackdq, /* setrun */
100 sys_nullsys, /* sleep */
101 sys_nullsys, /* tick */
102 setbackdq, /* wakeup */
103 sys_donice,
104 (pri_t (*)())sys_nosys, /* globpri */
105 sys_nullsys, /* set_process_group */
106 sys_nullsys, /* yield */
107 sys_doprio,
108 }
109
110 };
111
112
113 /* ARGSUSED */
114 pri_t
115 sys_init(cid, clparmsz, clfuncspp)
116 id_t cid;
117 int clparmsz;
118 classfuncs_t **clfuncspp;
119 {
120 *clfuncspp = &sys_classfuncs;
121 return ((pri_t)v.v_maxsyspri);
122 }
123
124 /*
125 * Get maximum and minimum priorities enjoyed by sysclass threads
126 */
127 static int
128 sys_getclpri(pcpri_t *pcprip)
129 {
130 pcprip->pc_clpmax = maxclsyspri;
131 pcprip->pc_clpmin = minclsyspri;
132 return (0);
133 }
134
135 /* ARGSUSED */
136 static int
137 sys_enterclass(t, cid, parmsp, reqpcredp, bufp)
138 kthread_t *t;
139 id_t cid;
140 void *parmsp;
141 cred_t *reqpcredp;
142 void *bufp;
143 {
144 return (0);
145 }
146
147 /* ARGSUSED */
148 static int
149 sys_canexit(kthread_t *t, cred_t *reqpcredp)
150 {
151 return (0);
152 }
153
154 /* ARGSUSED */
155 static int
156 sys_fork(t, ct, bufp)
157 kthread_t *t;
158 kthread_t *ct;
159 void *bufp;
160 {
161 /*
162 * No class specific data structure
163 */
164 return (0);
165 }
166
167
168 /* ARGSUSED */
169 static void
170 sys_forkret(t, ct)
171 kthread_t *t;
172 kthread_t *ct;
173 {
174 register proc_t *pp = ttoproc(t);
175 register proc_t *cp = ttoproc(ct);
176
177 ASSERT(t == curthread);
178 ASSERT(MUTEX_HELD(&pidlock));
179
180 /*
181 * Grab the child's p_lock before dropping pidlock to ensure
182 * the process does not disappear before we set it running.
183 */
184 mutex_enter(&cp->p_lock);
185 mutex_exit(&pidlock);
186 continuelwps(cp);
187 mutex_exit(&cp->p_lock);
188
189 mutex_enter(&pp->p_lock);
190 continuelwps(pp);
191 mutex_exit(&pp->p_lock);
192 }
193
194 static int
195 sys_nosys()
196 {
197 return (ENOSYS);
198 }
199
200
201 static void
202 sys_nullsys()
203 {
204 }
205
206 /* ARGSUSED */
207 static int
208 sys_donice(kthread_t *t, cred_t *cr, int incr, int *retvalp)
209 {
210 return (EINVAL);
211 }
212
213 /* ARGSUSED */
214 static int
215 sys_doprio(kthread_t *t, cred_t *cr, int incr, int *retvalp)
216 {
217 return (EINVAL);
218 }
219
220 /* ARGSUSED */
221 static int
222 sys_alloc(void **p, int flag)
223 {
224 *p = NULL;
225 return (0);
226 }