sys/arch/powerpc/pic/ipi.c

   1 /* $NetBSD: ipi.c,v 1.3 2008/04/08 02:33:03 garbled 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 1.3 2008/04/08 02:33:03 garbled 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/malloc.h>
  41 #include <sys/kernel.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
  53 struct ipi_ops ipiops;
  54 volatile u_long IPI[CPU_MAXNUM];
  55
  56 /* Process an actual IPI */
  57
  58 int
  59 ppcipi_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_HALT) {
  80                 aprint_normal("halting CPU %d\n", cpu_id);
  81                 msr = (mfmsr() & ~PSL_EE) | PSL_POW;
  82                 for (;;) {
  83                         __asm volatile ("sync; isync");
  84                         mtmsr(msr);
  85                 }
  86         }
  87         return 1;
  88 }
  89
  90 #endif /*MULTIPROCESSOR*/