1// SPDX-License-Identifier: GPL-2.0
2/*
3 *     signal quiesce handler
4 *
5 *  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/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/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
22static void do_machine_quiesce(void)
23{
24	psw_t quiesce_psw;
25
26	smp_send_stop();
27	quiesce_psw.mask =
28		PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT;
29	quiesce_psw.addr = 0xfff;
30	__load_psw(quiesce_psw);
31}
32
33/* Handler for quiesce event. Start shutdown procedure. */
34static void sclp_quiesce_handler(struct evbuf_header *evbuf)
35{
36	_machine_restart = (void *) do_machine_quiesce;
37	_machine_halt = do_machine_quiesce;
38	_machine_power_off = do_machine_quiesce;
39	ctrl_alt_del();
40}
41
42static struct sclp_register sclp_quiesce_event = {
43	.receive_mask = EVTYP_SIGQUIESCE_MASK,
44	.receiver_fn = sclp_quiesce_handler,
45};
46
47/* Initialize quiesce driver. */
48static int __init sclp_quiesce_init(void)
49{
50	return sclp_register(&sclp_quiesce_event);
51}
52device_initcall(sclp_quiesce_init);
53