1 | /* $NetBSD: userret.h,v 1.26 2013/04/07 07:54:53 kiyohara Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1998, 2000, 2003, 2006, 2008 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Charles M. Hannum, and Andrew Doran. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /*- |
33 | * Copyright (c) 1990 The Regents of the University of California. |
34 | * All rights reserved. |
35 | * |
36 | * This code is derived from software contributed to Berkeley by |
37 | * William Jolitz. |
38 | * |
39 | * Redistribution and use in source and binary forms, with or without |
40 | * modification, are permitted provided that the following conditions |
41 | * are met: |
42 | * 1. Redistributions of source code must retain the above copyright |
43 | * notice, this list of conditions and the following disclaimer. |
44 | * 2. Redistributions in binary form must reproduce the above copyright |
45 | * notice, this list of conditions and the following disclaimer in the |
46 | * documentation and/or other materials provided with the distribution. |
47 | * 3. Neither the name of the University nor the names of its contributors |
48 | * may be used to endorse or promote products derived from this software |
49 | * without specific prior written permission. |
50 | * |
51 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
52 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
53 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
54 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
55 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
56 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
57 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
58 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
59 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
60 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
61 | * SUCH DAMAGE. |
62 | * |
63 | */ |
64 | |
65 | #ifndef _SYS_USERRET_H_ |
66 | #define _SYS_USERRET_H_ |
67 | |
68 | #include <sys/lockdebug.h> |
69 | #include <sys/intr.h> |
70 | |
71 | /* |
72 | * Define the MI code needed before returning to user mode, for |
73 | * trap and syscall. |
74 | */ |
75 | static __inline void |
76 | mi_userret(struct lwp *l) |
77 | { |
78 | #ifndef __HAVE_PREEMPTION |
79 | struct cpu_info *ci; |
80 | #endif |
81 | |
82 | KASSERT(l->l_blcnt == 0); |
83 | #ifndef __HAVE_PREEMPTION |
84 | KASSERT(curcpu()->ci_biglock_count == 0); |
85 | #endif |
86 | |
87 | /* |
88 | * Handle "exceptional" events: pending signals, stop/exit actions, |
89 | * etc. Note that the event must be flagged BEFORE any AST is |
90 | * posted as we are reading unlocked. |
91 | */ |
92 | #ifdef __HAVE_PREEMPTION |
93 | if (__predict_false(l->l_flag & LW_USERRET)) { |
94 | lwp_userret(l); |
95 | } |
96 | l->l_kpriority = false; |
97 | /* |
98 | * cpu_set_curpri(prio) is a MD optimized version of: |
99 | * |
100 | * kpreempt_disable(); |
101 | * curcpu()->ci_schedstate.spc_curpriority = prio; |
102 | * kpreempt_enable(); |
103 | */ |
104 | cpu_set_curpri(l->l_priority); /* XXX this needs to die */ |
105 | #else |
106 | ci = l->l_cpu; |
107 | if (((l->l_flag & LW_USERRET) | ci->ci_data.cpu_softints) != 0) { |
108 | lwp_userret(l); |
109 | ci = l->l_cpu; |
110 | } |
111 | l->l_kpriority = false; |
112 | ci->ci_schedstate.spc_curpriority = l->l_priority; |
113 | #endif |
114 | |
115 | LOCKDEBUG_BARRIER(NULL, 0); |
116 | KASSERT(l->l_nopreempt == 0); |
117 | } |
118 | |
119 | #endif /* !_SYS_USERRET_H_ */ |
120 | |