/*      $OpenBSD: ast.c,v 1.18 2026/03/08 17:07:31 deraadt Exp $        */
/*      $NetBSD: ast.c,v 1.6 2003/10/31 16:44:34 cl Exp $       */

/*
 * Copyright (c) 1994,1995 Mark Brinicombe
 * All rights reserved.
 *
 * 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 RiscBSD team.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR OR CONTRIBUTERS 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.
 *
 * RiscBSD kernel project
 *
 * ast.c
 *
 * Code to handle ast's and returns to user mode
 *
 * Created      : 11/10/94
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>
#include <sys/syscall.h>
#include <sys/syscall_mi.h>

#include <uvm/uvm_extern.h>

/*
 * Prototypes
 */
void ast(struct trapframe *);
 
int want_resched;
extern int astpending;

/*
 * Handle asynchronous system traps.
 * This is called from the irq handler to deliver signals
 * and switch processes if required.
 */

void
ast(struct trapframe *tf)
{
        struct proc *p = curproc;

        atomic_inc_int(&uvmexp.traps);
        p->p_addr->u_pcb.pcb_tf = tf;
        refreshcreds(p);
        atomic_inc_int(&uvmexp.softs);
        mi_ast(p, want_resched);
        userret(p);
}