ipi.c revision 1.14 
1/* $NetBSD: ipi.c,v 1.14 2019/12/01 15:34:45 ad 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 1.14 2019/12/01 15:34:45 ad Exp $");
33
34#include "opt_multiprocessor.h"
35#include "opt_pic.h"
36#include "opt_interrupt.h"
37#include "opt_altivec.h"
38
39#include <sys/param.h>
40#include <sys/kernel.h>
41#include <sys/xcall.h>
42#include <sys/ipi.h>
43#include <sys/atomic.h>
44#include <sys/cpu.h>
45
46#include <powerpc/psl.h>
47
48#include <powerpc/pic/picvar.h>
49#include <powerpc/pic/ipivar.h>
50#include "opt_ipi.h"
51
52#ifdef MULTIPROCESSOR
53
54struct ipi_ops ipiops;
55
56/* Process an actual IPI */
57
58int
59ipi_intr(void *v)
60{
61	struct cpu_info * const ci = curcpu();
62	int cpu_id = cpu_index(ci);
63	int msr;
64	uint32_t ipi;
65
66	ci->ci_ev_ipi.ev_count++;
67	ipi = atomic_swap_32(&ci->ci_pending_ipis, 0);
68
69	if (ipi == IPI_NOMESG)
70		return 1;
71
72	if (ipi & IPI_XCALL)
73		xc_ipi_handler();
74
75	if (ipi & IPI_GENERIC)
76		ipi_cpu_handler();
77
78	if (ipi & IPI_SUSPEND)
79		cpu_pause(NULL);
80
81	if (ipi & IPI_AST)
82		ci->ci_onproc->l_md.md_astpending = 1;
83
84	if (ipi & IPI_HALT) {
85		struct cpuset_info * const csi = &cpuset_info;
86		aprint_normal("halting CPU %d\n", cpu_id);
87		kcpuset_set(csi->cpus_halted, cpu_id);
88		msr = (mfmsr() & ~PSL_EE) | PSL_POW;
89		for (;;) {
90			__asm volatile ("sync; isync");
91			mtmsr(msr);
92		}
93	}
94
95	return 1;
96}
97#endif /*MULTIPROCESSOR*/
98