x15/kern/shutdown.c

/*
 * Copyright (c) 2017 Richard Braun.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>

#include <kern/init.h>
#include <kern/plist.h>
#include <kern/shell.h>
#include <kern/shutdown.h>
#include <machine/boot.h>
#include <machine/cpu.h>

static struct plist shutdown_ops_list;

#ifdef CONFIG_SHELL

static void
shutdown_shell_halt (struct shell *shell __unused,
                     int argc __unused, char **argv __unused)
{
  shutdown_halt ();
}

static void
shutdown_shell_reboot (struct shell *shell __unused,
                       int argc __unused, char **argv __unused)
{
  shutdown_reboot ();
}

static struct shell_cmd shutdown_shell_cmds[] =
{
  SHELL_CMD_INITIALIZER ("shutdown_halt", shutdown_shell_halt,
                         "shutdown_halt", "halt the system"),
  SHELL_CMD_INITIALIZER ("shutdown_reboot", shutdown_shell_reboot,
                         "shutdown_reboot", "reboot the system"),
};

static int __init
shutdown_setup_shell (void)
{
  SHELL_REGISTER_CMDS (shutdown_shell_cmds, shell_get_main_cmd_set ());
  return (0);
}

INIT_OP_DEFINE (shutdown_setup_shell,
                INIT_OP_DEP (shell_setup, true),
                INIT_OP_DEP (shutdown_setup, true));

#endif

static int __init
shutdown_bootstrap (void)
{
  plist_init (&shutdown_ops_list);
  return (0);
}

INIT_OP_DEFINE (shutdown_bootstrap);

static int __init
shutdown_setup (void)
{
  return (0);
}

INIT_OP_DEFINE (shutdown_setup,
                INIT_OP_DEP (boot_setup_shutdown, true),
                INIT_OP_DEP (cpu_setup, true),
                INIT_OP_DEP (printf_setup, true),
                INIT_OP_DEP (shutdown_bootstrap, true));

void __init
shutdown_register (struct shutdown_ops *ops, unsigned int priority)
{
  plist_node_init (&ops->node, priority);
  plist_add (&shutdown_ops_list, &ops->node);
}

static void
shutdown_halt_other_cpus (void)
{
  cpu_intr_disable ();
  cpu_halt_broadcast ();
}

void
shutdown_halt (void)
{
  shutdown_halt_other_cpus();
  printf ("shutdown: system halted\n");
  cpu_halt ();
}

void
shutdown_reboot (void)
{
  if (plist_empty (&shutdown_ops_list))
    {
      printf ("shutdown: no reset operation available, halting\n");
      shutdown_halt();
    }

  shutdown_halt_other_cpus ();
  printf ("shutdown: rebooting...\n");

  struct shutdown_ops *ops;
  plist_for_each_entry_reverse (&shutdown_ops_list, ops, node)
    ops->reset ();

  cpu_halt ();
}