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
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>
15#include <linux/reboot.h>
16#include <asm/atomic.h>
17#include <asm/ptrace.h>
18#include <asm/sigp.h>
19#include <asm/smp.h>
20
21#include "sclp.h"
22
23/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
24static void
25do_machine_quiesce(void)
26{
27	psw_t quiesce_psw;
28
29	smp_send_stop();
30	quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
31	quiesce_psw.addr = 0xfff;
32	__load_psw(quiesce_psw);
33}
34
35/* Handler for quiesce event. Start shutdown procedure. */
36static void
37sclp_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
45static struct sclp_register sclp_quiesce_event = {
46	.receive_mask = EVTYP_SIGQUIESCE_MASK,
47	.receiver_fn = sclp_quiesce_handler
48};
49
50/* Initialize quiesce driver. */
51static int __init
52sclp_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
63module_init(sclp_quiesce_init);
64