1 /*
2 * Virtual hardware watchdog.
3 *
4 * Copyright (C) 2009 Red Hat Inc.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 *
19 * By Richard W.M. Jones (rjones@redhat.com).
20 */
21
22 #include "qemu-common.h"
23 #include "qemu-queue.h"
24 #include "sysemu.h"
25 #include "hw/watchdog.h"
26
27 static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
28
watchdog_add_model(WatchdogTimerModel * model)29 void watchdog_add_model(WatchdogTimerModel *model)
30 {
31 QLIST_INSERT_HEAD(&watchdog_list, model, entry);
32 }
33
34 /* Returns:
35 * 0 = continue
36 * 1 = exit program with error
37 * 2 = exit program without error
38 */
select_watchdog(const char * p)39 int select_watchdog(const char *p)
40 {
41 WatchdogTimerModel *model;
42
43 if (watchdog) {
44 fprintf(stderr,
45 "qemu: only one watchdog option may be given\n");
46 return 1;
47 }
48
49 /* -watchdog ? lists available devices and exits cleanly. */
50 if (strcmp(p, "?") == 0) {
51 QLIST_FOREACH(model, &watchdog_list, entry) {
52 fprintf(stderr, "\t%s\t%s\n",
53 model->wdt_name, model->wdt_description);
54 }
55 return 2;
56 }
57
58 QLIST_FOREACH(model, &watchdog_list, entry) {
59 if (strcasecmp(model->wdt_name, p) == 0) {
60 watchdog = model;
61 return 0;
62 }
63 }
64
65 fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
66 QLIST_FOREACH(model, &watchdog_list, entry) {
67 fprintf(stderr, "\t%s\t%s\n",
68 model->wdt_name, model->wdt_description);
69 }
70 return 1;
71 }
72
select_watchdog_action(const char * p)73 int select_watchdog_action(const char *p)
74 {
75 if (strcasecmp(p, "reset") == 0)
76 watchdog_action = WDT_RESET;
77 else if (strcasecmp(p, "shutdown") == 0)
78 watchdog_action = WDT_SHUTDOWN;
79 else if (strcasecmp(p, "poweroff") == 0)
80 watchdog_action = WDT_POWEROFF;
81 else if (strcasecmp(p, "pause") == 0)
82 watchdog_action = WDT_PAUSE;
83 else if (strcasecmp(p, "debug") == 0)
84 watchdog_action = WDT_DEBUG;
85 else if (strcasecmp(p, "none") == 0)
86 watchdog_action = WDT_NONE;
87 else
88 return -1;
89
90 return 0;
91 }
92
93 /* This actually performs the "action" once a watchdog has expired,
94 * ie. reboot, shutdown, exit, etc.
95 */
watchdog_perform_action(void)96 void watchdog_perform_action(void)
97 {
98 switch(watchdog_action) {
99 case WDT_RESET: /* same as 'system_reset' in monitor */
100 qemu_system_reset_request();
101 break;
102
103 case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */
104 qemu_system_powerdown_request();
105 break;
106
107 case WDT_POWEROFF: /* same as 'quit' command in monitor */
108 exit(0);
109 break;
110
111 case WDT_PAUSE: /* same as 'stop' command in monitor */
112 vm_stop(0);
113 break;
114
115 case WDT_DEBUG:
116 fprintf(stderr, "watchdog: timer fired\n");
117 break;
118
119 case WDT_NONE:
120 break;
121 }
122 }
123
watchdog_pc_init(PCIBus * pci_bus)124 void watchdog_pc_init(PCIBus *pci_bus)
125 {
126 if (watchdog)
127 watchdog->wdt_pc_init(pci_bus);
128 }
129
register_watchdogs(void)130 void register_watchdogs(void)
131 {
132 #if 0
133 wdt_ib700_init();
134 wdt_i6300esb_init();
135 #endif
136 }
137