LXR linux/drivers/s390/char/sclp

   1/*
   2 *  drivers/s390/char/sclp_quiesce.c
   3 *     signal quiesce handler
   4 *
   5 *  (C) 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/module.h>
  11#include <linux/types.h>
  12#include <linux/cpumask.h>
  13#include <linux/smp.h>
  14#include <linux/init.h>
  15#include <linux/reboot.h>
  16#include <asm/atomic.h>
  17#include <asm/ptrace.h>
  18#include <asm/sigp.h>
  19#include <asm/smp.h>
  20
  21#include "sclp.h"
  22
  23/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
  24static void
  25do_machine_quiesce(void)
  26{
  27        psw_t quiesce_psw;
  28
  29        smp_send_stop();
  30        quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
  31        quiesce_psw.addr = 0xfff;
  32        __load_psw(quiesce_psw);
  33}
  34
  35/* Handler for quiesce event. Start shutdown procedure. */
  36static void
  37sclp_quiesce_handler(struct evbuf_header *evbuf)
  38{
  39        _machine_restart = (void *) do_machine_quiesce;
  40        _machine_halt = do_machine_quiesce;
  41        _machine_power_off = do_machine_quiesce;
  42        ctrl_alt_del();
  43}
  44
  45static struct sclp_register sclp_quiesce_event = {
  46        .receive_mask = EVTYP_SIGQUIESCE_MASK,
  47        .receiver_fn = sclp_quiesce_handler
  48};
  49
  50/* Initialize quiesce driver. */
  51static int __init
  52sclp_quiesce_init(void)
  53{
  54        return sclp_register(&sclp_quiesce_event);
  55}
  56
  57module_init(sclp_quiesce_init);
  58