/* $OpenBSD: ipi.c,v 1.7 2007/05/25 16:22:11 art Exp $ */
/* $NetBSD: ipi.c,v 1.2 2003/03/01 13:05:37 fvdl Exp $ */
/*-
* Copyright (c) 2000 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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> /* RCS ID & Copyright macro defns */
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <machine/intr.h>
#include <machine/atomic.h>
#include <machine/cpuvar.h>
#include <machine/i82093var.h>
#include <machine/i82489reg.h>
#include <machine/i82489var.h>
int
x86_send_ipi(struct cpu_info *ci, int ipimask)
{
int ret;
x86_atomic_setbits_l(&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_apicid, LAPIC_DLMODE_FIXED);
if (ret != 0) {
printf("ipi of %x from %s to %s failed\n",
ipimask,
curcpu()->ci_dev->dv_xname,
ci->ci_dev->dv_xname);
}
return ret;
}
int
x86_fast_ipi(struct cpu_info *ci, int ipi)
{
if (!(ci->ci_flags & CPUF_RUNNING))
return (ENOENT);
return (x86_ipi(ipi, ci->ci_apicid, LAPIC_DLMODE_FIXED));
}
void
x86_broadcast_ipi(int ipimask)
{
struct cpu_info *ci, *self = curcpu();
int count = 0;
CPU_INFO_ITERATOR cii;
CPU_INFO_FOREACH(cii, ci) {
if (ci == self)
continue;
if ((ci->ci_flags & CPUF_RUNNING) == 0)
continue;
x86_atomic_setbits_l(&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;
cpumask &= ~(1U << cpu_number());
if (cpumask == 0)
return;
CPU_INFO_FOREACH(cii, ci) {
if ((cpumask & (1U << ci->ci_cpuid)) == 0)
continue;
x86_send_ipi(ci, ipimask);
}
}
void
x86_ipi_handler(void)
{
extern struct evcount ipi_count;
struct cpu_info *ci = curcpu();
u_int32_t pending;
int bit;
pending = x86_atomic_testset_ul(&ci->ci_ipis, 0);
for (bit = 0; bit < X86_NIPI && pending; bit++) {
if (pending & (1<<bit)) {
pending &= ~(1<<bit);
(*ipifunc[bit])(ci);
ipi_count.ec_count++;
}
}
}