kern/i386/halt.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2008  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/cpu/io.h>
  20 #include <grub/cpu/halt.h>
  21 #include <grub/machine/init.h>
  22 #include <grub/misc.h>
  23
  24 const char bochs_shutdown[] = "Shutdown";
  25
  26 void
  27 grub_halt (void)
  28 {
  29   unsigned int i;
  30
  31   /* Disable interrupts.  */
  32   __asm__ __volatile__ ("cli");
  33
  34   /* Bochs, QEMU, etc.  */
  35   for (i = 0; i < sizeof (bochs_shutdown) - 1; i++)
  36     grub_outb (bochs_shutdown[i], 0x8900);
  37
  38   grub_printf ("GRUB doesn't know how to halt this machine yet!\n");
  39
  40   /* In order to return we'd have to check what the previous status of IF
  41      flag was.  But user most likely doesn't want to return anyway ...  */
  42   grub_stop ();
  43 }