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1// SPDX-License-Identifier: GPL-2.02/*3 * signal quiesce handler4 *5 * Copyright IBM Corp. 1999, 20046 * 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