/* $NetBSD: ipi.c,v 1.13 2008/05/11 21:48:02 ad Exp $ */ /*- * Copyright (c) 2000, 2008 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by RedBack Networks Inc. * * Author: Bill Sommerfeld * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: ipi.c,v 1.13 2008/05/11 21:48:02 ad Exp $"); #include <sys/param.h> #include <sys/device.h> #include <sys/systm.h> #include <sys/atomic.h> #include <sys/intr.h> #include <sys/cpu.h> #include <machine/cpuvar.h> #include <machine/i82093var.h> #include <machine/i82489reg.h> #include <machine/i82489var.h> #ifdef MULTIPROCESSOR int x86_send_ipi(struct cpu_info *ci, int ipimask) { int ret; atomic_or_32(&ci->ci_ipis, ipimask); /* Don't send IPI to CPU which isn't (yet) running. */ if (!(ci->ci_flags & CPUF_RUNNING)) return ENOENT; ret = x86_ipi(LAPIC_IPI_VECTOR, ci->ci_cpuid, LAPIC_DLMODE_FIXED); if (ret != 0) { printf("ipi of %x from %s to %s failed\n", ipimask, device_xname(curcpu()->ci_dev), device_xname(ci->ci_dev)); } return ret; } void x86_broadcast_ipi(int ipimask) { struct cpu_info *ci, *self = curcpu(); int count = 0; CPU_INFO_ITERATOR cii; for (CPU_INFO_FOREACH(cii, ci)) { if (ci == self) continue; if ((ci->ci_flags & CPUF_RUNNING) == 0) continue; atomic_or_32(&ci->ci_ipis, ipimask); count++; } if (!count) return; x86_ipi(LAPIC_IPI_VECTOR, LAPIC_DEST_ALLEXCL, LAPIC_DLMODE_FIXED); } void x86_multicast_ipi(int cpumask, int ipimask) { struct cpu_info *ci; CPU_INFO_ITERATOR cii; if ((cpumask &= ~curcpu()->ci_cpumask) == 0) return; for (CPU_INFO_FOREACH(cii, ci)) { if ((cpumask & ci->ci_cpumask) != 0) x86_send_ipi(ci, ipimask); } } void x86_ipi_handler(void) { struct cpu_info *ci = curcpu(); uint32_t pending; int bit; pending = atomic_swap_32(&ci->ci_ipis, 0); KDASSERT((pending >> X86_NIPI) == 0); while ((bit = ffs(pending)) != 0) { bit--; pending &= ~(1<<bit); ci->ci_ipi_events[bit].ev_count++; (*ipifunc[bit])(ci); } } #else int x86_send_ipi(struct cpu_info *ci, int ipimask) { return 0; } void x86_broadcast_ipi(int ipimask) { } void x86_multicast_ipi(int cpumask, int ipimask) { } #endif