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ipi.c revision 1.2.12.2 
      1 /* $NetBSD: ipi.c,v 1.2.12.2 2007/11/06 23:20:54 matt 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  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *        This product includes software developed by the NetBSD
     20  *        Foundation, Inc. and its contributors.
     21  * 4. Neither the name of The NetBSD Foundation nor the names of its
     22  *    contributors may be used to endorse or promote products derived
     23  *    from this software without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     26  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: ipi.c,v 1.2.12.2 2007/11/06 23:20:54 matt Exp $");
     40 
     41 #include "opt_multiprocessor.h"
     42 #include "opt_pic.h"
     43 #include "opt_interrupt.h"
     44 #include "opt_altivec.h"
     45 
     46 #include <sys/param.h>
     47 #include <sys/malloc.h>
     48 #include <sys/kernel.h>
     49 
     50 #include <powerpc/atomic.h>
     51 #include <powerpc/fpu.h>
     52 #include <powerpc/altivec.h>
     53 
     54 #include <arch/powerpc/pic/picvar.h>
     55 #include <arch/powerpc/pic/ipivar.h>
     56 #include "opt_ipi.h"
     57 
     58 #ifdef MULTIPROCESSOR
     59 
     60 struct ipi_ops ipiops;
     61 volatile u_long IPI[CPU_MAXNUM];
     62 
     63 /* Process an actual IPI */
     64 
     65 int
     66 ppcipi_intr(void *v)
     67 {
     68 	int cpu_id = cpu_number();
     69 	int msr;
     70 	u_long ipi;
     71 
     72 	curcpu()->ci_ev_ipi.ev_count++;
     73 	ipi = atomic_loadlatch_ulong(&IPI[cpu_id], 0);
     74 
     75 	if (ipi == PPC_IPI_NOMESG)
     76 		return 1;
     77 
     78 	if (ipi & PPC_IPI_FLUSH_FPU)
     79 		save_fpu_cpu();
     80 
     81 #ifdef ALTIVEC
     82 	if (ipi & PPC_IPI_FLUSH_VEC)
     83 		save_vec_cpu();
     84 #endif
     85 
     86 	if (ipi & PPC_IPI_HALT) {
     87 		aprint_normal("halting CPU %d\n", cpu_id);
     88 		msr = (mfmsr() & ~PSL_EE) | PSL_POW;
     89 		for (;;) {
     90 			__asm volatile ("sync; isync");
     91 			mtmsr(msr);
     92 		}
     93 	}
     94 	return 1;
     95 }
     96 
     97 #endif /*MULTIPROCESSOR*/
     98