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// SPDX-License-Identifier: GPL-2.0
/*
* signal quiesce handler
*
* Copyright IBM Corp. 1999, 2004
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#include <linux/types.h>
#include <linux/cpumask.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/atomic.h>
#include <asm/ptrace.h>
#include <asm/smp.h>
#include "sclp.h"
/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
static void do_machine_quiesce(void)
{
psw_t quiesce_psw;
smp_send_stop();
quiesce_psw.mask =
PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT;
quiesce_psw.addr = 0xfff;
__load_psw(quiesce_psw);
}
/* Handler for quiesce event. Start shutdown procedure. */
static void sclp_quiesce_handler(struct evbuf_header *evbuf)
{
_machine_restart = (void *) do_machine_quiesce;
_machine_halt = do_machine_quiesce;
_machine_power_off = do_machine_quiesce;
ctrl_alt_del();
}
static struct sclp_register sclp_quiesce_event = {
.receive_mask = EVTYP_SIGQUIESCE_MASK,
.receiver_fn = sclp_quiesce_handler,
};
/* Initialize quiesce driver. */
static int __init sclp_quiesce_init(void)
{
return sclp_register(&sclp_quiesce_event);
}
device_initcall(sclp_quiesce_init);
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