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 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #include <sys/thread.h>
30 #include <sys/cpuvar.h>
31 #include <sys/machsystm.h>
32 #include <sys/systm.h>
33 #include <sys/promif.h>
34 #include <sys/xc_levels.h>
35 #include <sys/spl.h>
36 #include <sys/bitmap.h>
37
38 /*
39 * Interrupt another CPU.
40 * This is useful to make the other CPU go through a trap so that
41 * it recognizes an address space trap (AST) for preempting a thread.
42 *
43 * It is possible to be preempted here and be resumed on the CPU
44 * being poked, so it isn't an error to poke the current CPU.
45 * We could check this and still get preempted after the check, so
46 * we don't bother.
47 */
48 void
poke_cpu(int cpun)49 poke_cpu(int cpun)
50 {
51 if (panicstr)
52 return;
53 /*
54 * We don't need to receive an ACK from the CPU being poked,
55 * so just send out a directed interrupt.
56 */
57 send_dirint(cpun, XC_CPUPOKE_PIL);
58 }
59
60 /*
61 * Call a function on a target CPU
62 */
63 void
cpu_call(cpu_t * cp,cpu_call_func_t func,uintptr_t arg1,uintptr_t arg2)64 cpu_call(cpu_t *cp, cpu_call_func_t func, uintptr_t arg1, uintptr_t arg2)
65 {
66 cpuset_t set;
67
68 if (panicstr)
69 return;
70
71 /*
72 * Prevent CPU from going off-line
73 */
74 kpreempt_disable();
75
76 /*
77 * If we are on the target CPU, call the function directly, but raise
78 * the PIL to XC_PIL.
79 * This guarantees that functions called via cpu_call() can not ever
80 * interrupt each other.
81 */
82 if (CPU == cp) {
83 int save_spl = splr(ipltospl(XC_HI_PIL));
84
85 (*func)(arg1, arg2);
86 splx(save_spl);
87 } else {
88 CPUSET_ONLY(set, cp->cpu_id);
89 xc_call((xc_arg_t)arg1, (xc_arg_t)arg2, 0, CPUSET2BV(set),
90 (xc_func_t)(uintptr_t)func);
91 }
92 kpreempt_enable();
93 }
94