arch/all-pc/exec/shutdowna.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: ShutdownA() - Shut down the machine, PC version.
   6     Lang: english
   7 */
   8
   9 #include <asm/io.h>
  10 #include <proto/dos.h>
  11 #include <proto/exec.h>
  12
  13 /*
  14  * This code performs machine reset via legacy PC keyboard controller hardware.
  15  * On modern machines it's replaced by either efi.resource or acpi.resource,
  16  * using SetFunction().
  17  */
  18 AROS_LH1(ULONG, ShutdownA,
  19          AROS_LHA(ULONG, action, D0),
  20          struct ExecBase *, SysBase, 173, Exec)
  21 {
  22     AROS_LIBFUNC_INIT
  23
  24     /* Nothing worked, poor-man fallback */
  25     if (action == SD_ACTION_COLDREBOOT)
  26     {
  27         struct DosLibrary *DOSBase;
  28
  29         outb(0xFE, 0x64);
  30         /*
  31          * Keyboard controller can be slow, so we need to wait for some time.
  32          * If we don't do this, we'll can see "Unsupported action" error, immediately
  33          * followed by a restart, which looks strange.
  34          * we use dos.library/Delay() here for simplicity. It works from within tasks.
  35          */
  36         DOSBase = (APTR)OpenLibrary("dos.library", 36);
  37         if (DOSBase)
  38         {
  39             Delay(50);
  40             CloseLibrary((struct Library *)DOSBase);
  41         }
  42         /*
  43          * On some machines (new PCs without PS/2 keyboard and ACPI disabled)
  44          * this might not work.
  45          * So we need to be able to return cleanly.
  46          */
  47     }
  48     return 0;
  49
  50     AROS_LIBFUNC_EXIT
  51 }