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