| 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. */ |
| 22 | static 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. */ |
| 34 | static 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 | |
| 42 | static struct sclp_register sclp_quiesce_event = { |
| 43 | .receive_mask = EVTYP_SIGQUIESCE_MASK, |
| 44 | .receiver_fn = sclp_quiesce_handler, |
| 45 | }; |
| 46 | |
| 47 | /* Initialize quiesce driver. */ |
| 48 | static int __init sclp_quiesce_init(void) |
| 49 | { |
| 50 | return sclp_register(reg: &sclp_quiesce_event); |
| 51 | } |
| 52 | device_initcall(sclp_quiesce_init); |
| 53 |