Cothreads do not have a globaldata context and cannot handle signals
[dragonfly.git] / sys / platform / vkernel / platform / machintr.c
1 /*
2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
3  * 
4  * This code is derived from software contributed to The DragonFly Project
5  * by Matthew Dillon <dillon@backplane.com>
6  * 
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 
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
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  * 3. Neither the name of The DragonFly Project nor the names of its
18  *    contributors may be used to endorse or promote products derived
19  *    from this software without specific, prior written permission.
20  * 
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  * 
34  * $DragonFly: src/sys/platform/vkernel/platform/machintr.c,v 1.17 2008/04/30 16:59:45 dillon Exp $
35  */
36
37 #include <sys/types.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/machintr.h>
41 #include <sys/errno.h>
42 #include <sys/mman.h>
43 #include <sys/globaldata.h>
44 #include <sys/interrupt.h>
45 #include <stdio.h>
46 #include <signal.h>
47 #include <machine/globaldata.h>
48 #include <machine/md_var.h>
49 #include <sys/thread2.h>
50
51 /*
52  * Interrupt Subsystem ABI
53  */
54
55 static void dummy_intrdis(int);
56 static void dummy_intren(int);
57 static int dummy_vectorctl(int, int, int);
58 static int dummy_setvar(int, const void *);
59 static int dummy_getvar(int, void *);
60 static void dummy_finalize(void);
61 static void dummy_intrcleanup(void);
62
63 struct machintr_abi MachIntrABI = {
64         MACHINTR_GENERIC,
65         .intrdis =      dummy_intrdis,
66         .intren =       dummy_intren,
67         .vectorctl =    dummy_vectorctl,
68         .setvar =       dummy_setvar,
69         .getvar =       dummy_getvar,
70         .finalize =     dummy_finalize,
71         .cleanup =      dummy_intrcleanup
72 };
73
74 static void
75 dummy_intrdis(int intr)
76 {
77 }
78
79 static void
80 dummy_intren(int intr)
81 {
82 }
83
84 static int
85 dummy_vectorctl(int op, int intr, int flags)
86 {
87         return (0);
88         /* return (EOPNOTSUPP); */
89 }
90
91 static int
92 dummy_setvar(int varid, const void *buf)
93 {
94         return (ENOENT);
95 }
96
97 static int
98 dummy_getvar(int varid, void *buf)
99 {
100         return (ENOENT);
101 }
102
103 static void
104 dummy_finalize(void)
105 {
106 }
107
108 static void
109 dummy_intrcleanup(void)
110 {
111 }
112
113 /*
114  * Process pending interrupts
115  */
116 void
117 splz(void)
118 {
119         struct mdglobaldata *gd = mdcpu;
120         thread_t td = gd->mi.gd_curthread;
121         int irq;
122
123         while (gd->mi.gd_reqflags & (RQF_IPIQ|RQF_INTPEND)) {
124                 crit_enter_quick(td);
125 #ifdef SMP
126                 if (gd->mi.gd_reqflags & RQF_IPIQ) {
127                         atomic_clear_int_nonlocked(&gd->mi.gd_reqflags,
128                                                    RQF_IPIQ);
129                         lwkt_process_ipiq();
130                 }
131 #endif
132                 if (gd->mi.gd_reqflags & RQF_INTPEND) {
133                         atomic_clear_int_nonlocked(&gd->mi.gd_reqflags,
134                                                    RQF_INTPEND);
135                         while ((irq = ffs(gd->gd_spending)) != 0) {
136                                 --irq;
137                                 atomic_clear_int(&gd->gd_spending, 1 << irq);
138                                 irq += FIRST_SOFTINT;
139                                 sched_ithd(irq);
140                         }
141                         while ((irq = ffs(gd->gd_fpending)) != 0) {
142                                 --irq;
143                                 atomic_clear_int(&gd->gd_fpending, 1 << irq);
144                                 sched_ithd(irq);
145                         }
146                 }
147                 crit_exit_noyield(td);
148         }
149 }
150
151 /*
152  * Allows an unprotected signal handler or mailbox to signal an interrupt
153  */
154 void
155 signalintr(int intr)
156 {
157         struct mdglobaldata *gd = mdcpu;
158         thread_t td = gd->mi.gd_curthread;
159
160         if (td->td_pri >= TDPRI_CRIT) {
161                 atomic_set_int_nonlocked(&gd->gd_fpending, 1 << intr);
162                 atomic_set_int_nonlocked(&gd->mi.gd_reqflags, RQF_INTPEND);
163         } else {
164                 crit_enter_quick(td);
165                 atomic_clear_int(&gd->gd_fpending, 1 << intr);
166                 sched_ithd(intr);
167                 crit_exit_quick(td);
168         }
169 }
170
171 void
172 cpu_disable_intr(void)
173 {
174         sigblock(sigmask(SIGALRM)|sigmask(SIGIO));
175 }
176
177 void
178 cpu_enable_intr(void)
179 {
180         sigsetmask(0);
181 }
182
183 void
184 cpu_mask_all_signals(void)
185 {
186         sigblock(sigmask(SIGALRM)|sigmask(SIGIO)|sigmask(SIGQUIT)|
187                  sigmask(SIGUSR1)|sigmask(SIGTERM)|sigmask(SIGWINCH)|
188                  sigmask(SIGUSR2));
189 }
190
191 void
192 cpu_unmask_all_signals(void)
193 {
194         sigsetmask(0);
195 }
196
197 void
198 cpu_invlpg(void *addr)
199 {
200         madvise(addr, PAGE_SIZE, MADV_INVAL);
201 }
202
203 void
204 cpu_invltlb(void)
205 {
206         madvise((void *)KvaStart, KvaEnd - KvaStart, MADV_INVAL);
207 }
208