This source file includes following definitions.
- do_machine_quiesce
- sclp_quiesce_handler
- sclp_quiesce_pm_event
- sclp_quiesce_init
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10 #include <linux/types.h>
11 #include <linux/cpumask.h>
12 #include <linux/smp.h>
13 #include <linux/init.h>
14 #include <linux/reboot.h>
15 #include <linux/atomic.h>
16 #include <asm/ptrace.h>
17 #include <asm/smp.h>
18
19 #include "sclp.h"
20
21 static void (*old_machine_restart)(char *);
22 static void (*old_machine_halt)(void);
23 static void (*old_machine_power_off)(void);
24
25
26 static void do_machine_quiesce(void)
27 {
28 psw_t quiesce_psw;
29
30 smp_send_stop();
31 quiesce_psw.mask =
32 PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT;
33 quiesce_psw.addr = 0xfff;
34 __load_psw(quiesce_psw);
35 }
36
37
38 static void sclp_quiesce_handler(struct evbuf_header *evbuf)
39 {
40 if (_machine_restart != (void *) do_machine_quiesce) {
41 old_machine_restart = _machine_restart;
42 old_machine_halt = _machine_halt;
43 old_machine_power_off = _machine_power_off;
44 _machine_restart = (void *) do_machine_quiesce;
45 _machine_halt = do_machine_quiesce;
46 _machine_power_off = do_machine_quiesce;
47 }
48 ctrl_alt_del();
49 }
50
51
52 static void sclp_quiesce_pm_event(struct sclp_register *reg,
53 enum sclp_pm_event sclp_pm_event)
54 {
55 switch (sclp_pm_event) {
56 case SCLP_PM_EVENT_RESTORE:
57 if (old_machine_restart) {
58 _machine_restart = old_machine_restart;
59 _machine_halt = old_machine_halt;
60 _machine_power_off = old_machine_power_off;
61 old_machine_restart = NULL;
62 old_machine_halt = NULL;
63 old_machine_power_off = NULL;
64 }
65 break;
66 case SCLP_PM_EVENT_FREEZE:
67 case SCLP_PM_EVENT_THAW:
68 break;
69 }
70 }
71
72 static struct sclp_register sclp_quiesce_event = {
73 .receive_mask = EVTYP_SIGQUIESCE_MASK,
74 .receiver_fn = sclp_quiesce_handler,
75 .pm_event_fn = sclp_quiesce_pm_event
76 };
77
78
79 static int __init sclp_quiesce_init(void)
80 {
81 return sclp_register(&sclp_quiesce_event);
82 }
83 device_initcall(sclp_quiesce_init);