ipi.c revision 1.6 
1/* $NetBSD: ipi.c,v 1.6 2010/06/25 19:00:05 rmind 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 1.6 2010/06/25 19:00:05 rmind 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
43#include <powerpc/atomic.h>
44#include <powerpc/fpu.h>
45#include <powerpc/altivec.h>
46
47#include <arch/powerpc/pic/picvar.h>
48#include <arch/powerpc/pic/ipivar.h>
49#include "opt_ipi.h"
50
51#ifdef MULTIPROCESSOR
52
53struct ipi_ops ipiops;
54volatile u_long IPI[CPU_MAXNUM];
55
56/* Process an actual IPI */
57
58int
59ppcipi_intr(void *v)
60{
61	int cpu_id = curcpu()->ci_index;
62	int msr;
63	u_long ipi;
64
65	curcpu()->ci_ev_ipi.ev_count++;
66	ipi = atomic_loadlatch_ulong(&IPI[cpu_id], 0);
67
68	if (ipi == PPC_IPI_NOMESG)
69		return 1;
70
71	if (ipi & PPC_IPI_FLUSH_FPU)
72		save_fpu_cpu();
73
74#ifdef ALTIVEC
75	if (ipi & PPC_IPI_FLUSH_VEC)
76		save_vec_cpu();
77#endif
78
79	if (ipi & PPC_IPI_XCALL)
80		xc_ipi_handler();
81
82	if (ipi & PPC_IPI_HALT) {
83		aprint_normal("halting CPU %d\n", cpu_id);
84		msr = (mfmsr() & ~PSL_EE) | PSL_POW;
85		for (;;) {
86			__asm volatile ("sync; isync");
87			mtmsr(msr);
88		}
89	}
90
91	return 1;
92}
93
94/*
95 * MD support for xcall(9) interface.
96 */
97
98void
99xc_send_ipi(struct cpu_info *ci)
100{
101
102	KASSERT(kpreempt_disabled());
103	KASSERT(curcpu() != ci);
104
105	if (ci) {
106		/* Unicast: remote CPU. */
107		ppc_send_ipi(ci->ci_cpuid, PPC_IPI_XCALL);
108	} else {
109		/* Broadcast: all, but local CPU (caller will handle it). */
110		ppc_send_ipi(IPI_T_NOTME, PPC_IPI_XCALL);
111	}
112}
113
114#endif /*MULTIPROCESSOR*/
115