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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Facilities for cross-processor subroutine calls using "mailbox" interrupts.
*/
#include <sys/types.h>
#include <sys/thread.h>
#include <sys/cpuvar.h>
#include <sys/x_call.h>
#include <sys/systm.h>
#include <sys/machsystm.h>
#include <sys/intr.h>
#include <sys/xc_impl.h>
/*
* Interrupt another CPU.
* This is useful to make the other CPU go through a trap so that
* it recognizes an address space trap (AST) for preempting a thread.
*
* It is possible to be preempted here and be resumed on the CPU
* being poked, so it isn't an error to poke the current CPU.
* We could check this and still get preempted after the check, so
* we don't bother.
*/
void
poke_cpu(int cpun)
{
uint32_t *ptr = (uint32_t *)&cpu[cpun]->cpu_m.poke_cpu_outstanding;
/*
* If panicstr is set or a poke_cpu is already pending,
* no need to send another one. Use atomic swap to protect
* against multiple CPUs sending redundant pokes.
*/
if (panicstr || *ptr == B_TRUE ||
atomic_swap_32(ptr, B_TRUE) == B_TRUE)
return;
xt_one(cpun, setsoftint_tl1, poke_cpu_inum, 0);
}
extern int xc_spl_enter[];
/*
* Call a function on a target CPU
*/
void
cpu_call(cpu_t *cp, cpu_call_func_t func, uintptr_t arg1, uintptr_t arg2)
{
if (panicstr)
return;
/*
* Prevent CPU from going offline
*/
kpreempt_disable();
/*
* If we are on the target CPU, call the function directly, but raise
* the PIL to XC_PIL.
* This guarantees that functions called via cpu_call() can not ever
* interrupt each other.
*/
if (CPU != cp) {
xc_one(cp->cpu_id, (xcfunc_t *)func, (uint64_t)arg1,
(uint64_t)arg2);
} else {
int lcx;
int opl;
XC_SPL_ENTER(lcx, opl);
func(arg1, arg2);
XC_SPL_EXIT(lcx, opl);
}
kpreempt_enable();
}
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