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      1 /* $NetBSD: ipi.c,v 1.16 2020/07/06 11:01:24 rin 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 1.16 2020/07/06 11:01:24 rin Exp $");
     33 
     34 #ifdef _KERNEL_OPT
     35 #include "opt_multiprocessor.h"
     36 #endif
     37 
     38 #include <sys/param.h>
     39 #include <sys/kernel.h>
     40 #include <sys/xcall.h>
     41 #include <sys/ipi.h>
     42 #include <sys/atomic.h>
     43 #include <sys/cpu.h>
     44 
     45 #include <powerpc/psl.h>
     46 
     47 #include <powerpc/pic/picvar.h>
     48 #include <powerpc/pic/ipivar.h>
     49 
     50 #ifdef MULTIPROCESSOR
     51 
     52 struct ipi_ops ipiops;
     53 
     54 /* Process an actual IPI */
     55 
     56 int
     57 ipi_intr(void *v)
     58 {
     59 	struct cpu_info * const ci = curcpu();
     60 	int cpu_id = cpu_index(ci);
     61 	int msr;
     62 	uint32_t ipi;
     63 
     64 	ci->ci_ev_ipi.ev_count++;
     65 	ipi = atomic_swap_32(&ci->ci_pending_ipis, 0);
     66 
     67 	if (ipi == IPI_NOMESG)
     68 		return 1;
     69 
     70 	if (ipi & IPI_XCALL)
     71 		xc_ipi_handler();
     72 
     73 	if (ipi & IPI_GENERIC)
     74 		ipi_cpu_handler();
     75 
     76 	if (ipi & IPI_SUSPEND)
     77 		cpu_pause(NULL);
     78 
     79 	if (ipi & IPI_AST)
     80 		ci->ci_onproc->l_md.md_astpending = 1;
     81 
     82 	if (ipi & IPI_HALT) {
     83 		struct cpuset_info * const csi = &cpuset_info;
     84 		aprint_normal("halting CPU %d\n", cpu_id);
     85 		kcpuset_set(csi->cpus_halted, cpu_id);
     86 		msr = (mfmsr() & ~PSL_EE) | PSL_POW;
     87 		for (;;) {
     88 			__asm volatile ("sync; isync");
     89 			mtmsr(msr);
     90 		}
     91 	}
     92 
     93 	return 1;
     94 }
     95 #endif /*MULTIPROCESSOR*/
     96