projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 1da177e4 LT |
2 | * signal quiesce handler |
| 3 | * | |
| a53c8fab | 4 | * Copyright IBM Corp. 1999, 2004 |
| 1da177e4 LT |
5 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 6 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | |
| 7 | */ | |
| 8 | ||
| 1da177e4 LT |
9 | #include <linux/module.h> |
| 10 | #include <linux/types.h> | |
| 11 | #include <linux/cpumask.h> | |
| 12 | #include <linux/smp.h> | |
| 13 | #include <linux/init.h> | |
| 83cc5ed3 | 14 | #include <linux/reboot.h> |
| 60063497 | 15 | #include <linux/atomic.h> |
| 1da177e4 | 16 | #include <asm/ptrace.h> |
| 188596fa | 17 | #include <asm/smp.h> |
| 1da177e4 LT |
18 | |
| 19 | #include "sclp.h" | |
| 20 | ||
| 8b94c1ed MS |
21 | static void (*old_machine_restart)(char *); |
| 22 | static void (*old_machine_halt)(void); | |
| 23 | static void (*old_machine_power_off)(void); | |
| 24 | ||
| 1da177e4 | 25 | /* Shutdown handler. Signal completion of shutdown by loading special PSW. */ |
| 8b94c1ed | 26 | static void do_machine_quiesce(void) |
| 1da177e4 LT |
27 | { |
| 28 | psw_t quiesce_psw; | |
| 29 | ||
| c6b5b847 | 30 | smp_send_stop(); |
| b50511e4 MS |
31 | quiesce_psw.mask = |
| 32 | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT; | |
| 1da177e4 LT |
33 | quiesce_psw.addr = 0xfff; |
| 34 | __load_psw(quiesce_psw); | |
| 35 | } | |
| 1da177e4 | 36 | |
| 1da177e4 | 37 | /* Handler for quiesce event. Start shutdown procedure. */ |
| 8b94c1ed | 38 | static void sclp_quiesce_handler(struct evbuf_header *evbuf) |
| 1da177e4 | 39 | { |
| 8b94c1ed MS |
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 | } | |
| 1da177e4 LT |
48 | ctrl_alt_del(); |
| 49 | } | |
| 50 | ||
| 8b94c1ed MS |
51 | /* Undo machine restart/halt/power_off modification on resume */ |
| 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 | ||
| 1da177e4 | 72 | static struct sclp_register sclp_quiesce_event = { |
| 6d4740c8 | 73 | .receive_mask = EVTYP_SIGQUIESCE_MASK, |
| 8b94c1ed MS |
74 | .receiver_fn = sclp_quiesce_handler, |
| 75 | .pm_event_fn = sclp_quiesce_pm_event | |
| 1da177e4 LT |
76 | }; |
| 77 | ||
| 78 | /* Initialize quiesce driver. */ | |
| 8b94c1ed | 79 | static int __init sclp_quiesce_init(void) |
| 1da177e4 | 80 | { |
| a12c53f4 | 81 | return sclp_register(&sclp_quiesce_event); |
| 1da177e4 LT |
82 | } |
| 83 | ||
| 84 | module_init(sclp_quiesce_init); |