arch/ppc-sam440/exec/superstate.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: SuperState() - Switch the processor into a higher plane.
   6     Lang: english
   7 */
   8
   9 #include <proto/exec.h>
  10 #include <asm/amcc440.h>
  11
  12 /* See rom/exec/superstate.c for documentation */
  13
  14 AROS_LH0(APTR, SuperState,
  15     struct ExecBase *, SysBase, 25, Exec)
  16 {
  17     AROS_LIBFUNC_INIT
  18
  19     asm volatile("li %%r3,%0; sc"::"i"(6 /*SC_SUPERSTATE*/):"memory","r3");
  20
  21     /* We have to return something. NULL is an invalid address for a
  22        stack, so it could be used to say that this function does
  23        nothing.
  24     */
  25     return NULL;
  26
  27     AROS_LIBFUNC_EXIT
  28 } /* SuperState() */