1 /* $OpenBSD: ipi.c,v 1.18 2022/11/10 08:26:54 jmatthew Exp $ */
2 /* $NetBSD: ipi.c,v 1.2 2003/03/01 13:05:37 fvdl Exp $ */
3
4 /*-
5 * Copyright (c) 2000 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by RedBack Networks Inc.
10 *
11 * Author: Bill Sommerfeld
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <sys/param.h>
36 #include <sys/device.h>
37 #include <sys/systm.h>
38
39 #include <machine/intr.h>
40 #include <machine/atomic.h>
41 #include <machine/cpuvar.h>
42 #include <machine/i82489reg.h>
43 #include <machine/i82489var.h>
44
45 void
x86_send_ipi(struct cpu_info * ci,int ipimask)46 x86_send_ipi(struct cpu_info *ci, int ipimask)
47 {
48 x86_atomic_setbits_u32(&ci->ci_ipis, ipimask);
49
50 /* Don't send IPI to cpu which isn't (yet) running. */
51 if (!(ci->ci_flags & CPUF_RUNNING))
52 return;
53
54 x86_ipi(LAPIC_IPI_VECTOR, ci->ci_apicid, LAPIC_DLMODE_FIXED);
55 }
56
57 int
x86_fast_ipi(struct cpu_info * ci,int ipi)58 x86_fast_ipi(struct cpu_info *ci, int ipi)
59 {
60 if (!(ci->ci_flags & CPUF_RUNNING))
61 return (ENOENT);
62
63 x86_ipi(ipi, ci->ci_apicid, LAPIC_DLMODE_FIXED);
64
65 return 0;
66 }
67
68 void
x86_broadcast_ipi(int ipimask)69 x86_broadcast_ipi(int ipimask)
70 {
71 struct cpu_info *ci, *self = curcpu();
72 int count = 0;
73 CPU_INFO_ITERATOR cii;
74
75 CPU_INFO_FOREACH(cii, ci) {
76 if (ci == self)
77 continue;
78 if ((ci->ci_flags & CPUF_RUNNING) == 0)
79 continue;
80 x86_atomic_setbits_u32(&ci->ci_ipis, ipimask);
81 count++;
82 }
83 if (!count)
84 return;
85
86 x86_ipi(LAPIC_IPI_VECTOR, LAPIC_DEST_ALLEXCL, LAPIC_DLMODE_FIXED);
87 }
88
89 void
x86_ipi_handler(void)90 x86_ipi_handler(void)
91 {
92 extern struct evcount ipi_count;
93 struct cpu_info *ci = curcpu();
94 u_int32_t pending;
95 int bit;
96 int floor;
97
98 floor = ci->ci_handled_intr_level;
99 ci->ci_handled_intr_level = ci->ci_ilevel;
100
101 pending = atomic_swap_uint(&ci->ci_ipis, 0);
102 for (bit = 0; bit < X86_NIPI && pending; bit++) {
103 if (pending & (1 << bit)) {
104 pending &= ~(1 << bit);
105 (*ipifunc[bit])(ci);
106 evcount_inc(&ipi_count);
107 }
108 }
109
110 ci->ci_handled_intr_level = floor;
111 }
112