1 /* $NetBSD: ipi.c,v 1.16 2020/07/06 11:01:24 rin Exp $ */
2 /*-
3 * Copyright (c) 2007 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Tim Rightnour
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: ipi.c,v 1.16 2020/07/06 11:01:24 rin Exp $");
33
34 #ifdef _KERNEL_OPT
35 #include "opt_multiprocessor.h"
36 #endif
37
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/xcall.h>
41 #include <sys/ipi.h>
42 #include <sys/atomic.h>
43 #include <sys/cpu.h>
44
45 #include <powerpc/psl.h>
46
47 #include <powerpc/pic/picvar.h>
48 #include <powerpc/pic/ipivar.h>
49
50 #ifdef MULTIPROCESSOR
51
52 struct ipi_ops ipiops;
53
54 /* Process an actual IPI */
55
56 int
ipi_intr(void * v)57 ipi_intr(void *v)
58 {
59 struct cpu_info * const ci = curcpu();
60 int cpu_id = cpu_index(ci);
61 int msr;
62 uint32_t ipi;
63
64 ci->ci_ev_ipi.ev_count++;
65 ipi = atomic_swap_32(&ci->ci_pending_ipis, 0);
66
67 if (ipi == IPI_NOMESG)
68 return 1;
69
70 if (ipi & IPI_XCALL)
71 xc_ipi_handler();
72
73 if (ipi & IPI_GENERIC)
74 ipi_cpu_handler();
75
76 if (ipi & IPI_SUSPEND)
77 cpu_pause(NULL);
78
79 if (ipi & IPI_AST)
80 ci->ci_onproc->l_md.md_astpending = 1;
81
82 if (ipi & IPI_HALT) {
83 struct cpuset_info * const csi = &cpuset_info;
84 aprint_normal("halting CPU %d\n", cpu_id);
85 kcpuset_set(csi->cpus_halted, cpu_id);
86 msr = (mfmsr() & ~PSL_EE) | PSL_POW;
87 for (;;) {
88 __asm volatile ("sync; isync");
89 mtmsr(msr);
90 }
91 }
92
93 return 1;
94 }
95 #endif /*MULTIPROCESSOR*/
96