1 /* $OpenBSD: ast.c,v 1.17 2021/03/25 04:12:00 jsg Exp $ */
2 /* $NetBSD: ast.c,v 1.6 2003/10/31 16:44:34 cl Exp $ */
3
4 /*
5 * Copyright (c) 1994,1995 Mark Brinicombe
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the RiscBSD team.
19 * 4. The name of the company nor the name of the author may be used to
20 * endorse or promote products derived from this software without specific
21 * prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * RiscBSD kernel project
36 *
37 * ast.c
38 *
39 * Code to handle ast's and returns to user mode
40 *
41 * Created : 11/10/94
42 */
43
44 #include <sys/param.h>
45 #include <sys/proc.h>
46 #include <sys/user.h>
47 #include <sys/systm.h>
48 #include <sys/vmmeter.h>
49 #include <sys/syscall.h>
50 #include <sys/syscall_mi.h>
51
52 #include <uvm/uvm_extern.h>
53
54 /*
55 * Prototypes
56 */
57 void ast(struct trapframe *);
58
59 int want_resched;
60 extern int astpending;
61
62 /*
63 * Handle asynchronous system traps.
64 * This is called from the irq handler to deliver signals
65 * and switch processes if required.
66 */
67
68 void
ast(struct trapframe * tf)69 ast(struct trapframe *tf)
70 {
71 struct proc *p = curproc;
72
73 uvmexp.traps++;
74 p->p_addr->u_pcb.pcb_tf = tf;
75 refreshcreds(p);
76 uvmexp.softs++;
77 mi_ast(p, want_resched);
78 userret(p);
79 }
80