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ipi.c revision 1.6.2.1 
      1 /* $NetBSD: ipi.c,v 1.6.2.1 2011/06/06 09:06:30 jruoho 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 1.6.2.1 2011/06/06 09:06:30 jruoho 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/atomic.h>
     43 #include <sys/cpu.h>
     44 
     45 #include <arch/powerpc/pic/picvar.h>
     46 #include <arch/powerpc/pic/ipivar.h>
     47 #include "opt_ipi.h"
     48 
     49 #ifdef MULTIPROCESSOR
     50 
     51 struct ipi_ops ipiops;
     52 
     53 /* Process an actual IPI */
     54 
     55 int
     56 ipi_intr(void *v)
     57 {
     58 	struct cpu_info * const ci = curcpu();
     59 	int cpu_id = cpu_index(ci);
     60 	int msr;
     61 	uint32_t ipi;
     62 
     63 	ci->ci_ev_ipi.ev_count++;
     64 	ipi = atomic_swap_32(&ci->ci_pending_ipis, 0);
     65 
     66 	if (ipi == IPI_NOMESG)
     67 		return 1;
     68 
     69 	if (ipi & IPI_XCALL)
     70 		xc_ipi_handler();
     71 
     72 	if (ipi & IPI_HALT) {
     73 		aprint_normal("halting CPU %d\n", cpu_id);
     74 		msr = (mfmsr() & ~PSL_EE) | PSL_POW;
     75 		for (;;) {
     76 			__asm volatile ("sync; isync");
     77 			mtmsr(msr);
     78 		}
     79 	}
     80 
     81 	return 1;
     82 }
     83 #endif /*MULTIPROCESSOR*/
     84