a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
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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/module.h>
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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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module_init(sclp_quiesce_init);
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