Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/char/sclp_quiesce.c |
| 3 | * signal quiesce handler |
| 4 | * |
| 5 | * (C) Copyright IBM Corp. 1999,2004 |
| 6 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 7 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> |
| 8 | */ |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/cpumask.h> |
| 13 | #include <linux/smp.h> |
| 14 | #include <linux/init.h> |
Adrian Bunk | 83cc5ed | 2006-06-25 05:47:41 -0700 | [diff] [blame] | 15 | #include <linux/reboot.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <asm/atomic.h> |
| 17 | #include <asm/ptrace.h> |
| 18 | #include <asm/sigp.h> |
Jan Glauber | 188596f | 2007-02-21 10:55:03 +0100 | [diff] [blame] | 19 | #include <asm/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | #include "sclp.h" |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | /* Shutdown handler. Signal completion of shutdown by loading special PSW. */ |
| 24 | static void |
| 25 | do_machine_quiesce(void) |
| 26 | { |
| 27 | psw_t quiesce_psw; |
| 28 | |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 29 | smp_send_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; |
| 31 | quiesce_psw.addr = 0xfff; |
| 32 | __load_psw(quiesce_psw); |
| 33 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | /* Handler for quiesce event. Start shutdown procedure. */ |
| 36 | static void |
| 37 | sclp_quiesce_handler(struct evbuf_header *evbuf) |
| 38 | { |
| 39 | _machine_restart = (void *) do_machine_quiesce; |
| 40 | _machine_halt = do_machine_quiesce; |
| 41 | _machine_power_off = do_machine_quiesce; |
| 42 | ctrl_alt_del(); |
| 43 | } |
| 44 | |
| 45 | static struct sclp_register sclp_quiesce_event = { |
Stefan Haberland | 6d4740c | 2007-04-27 16:01:53 +0200 | [diff] [blame^] | 46 | .receive_mask = EVTYP_SIGQUIESCE_MASK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | .receiver_fn = sclp_quiesce_handler |
| 48 | }; |
| 49 | |
| 50 | /* Initialize quiesce driver. */ |
| 51 | static int __init |
| 52 | sclp_quiesce_init(void) |
| 53 | { |
| 54 | int rc; |
| 55 | |
| 56 | rc = sclp_register(&sclp_quiesce_event); |
| 57 | if (rc) |
| 58 | printk(KERN_WARNING "sclp: could not register quiesce handler " |
| 59 | "(rc=%d)\n", rc); |
| 60 | return rc; |
| 61 | } |
| 62 | |
| 63 | module_init(sclp_quiesce_init); |