sclp_quiesce.c (1310B)
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);