arch/arm-native/exec/superstate.c

   1 /*
   2     Copyright © 2013, 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
  11 /* See rom/exec/superstate.c for documentation */
  12
  13 AROS_LH0(APTR, SuperState,
  14     struct ExecBase *, SysBase, 25, Exec)
  15 {
  16     AROS_LIBFUNC_INIT
  17
  18     register unsigned int superSP;
  19
  20     asm volatile (
  21         "       stmfd   sp!, {lr}               \n"
  22         "       mov     r1, sp                  \n"
  23         "       swi     %[swi_no]               \n"
  24         "       mov     %[superSP], sp          \n"
  25         "       mov     sp, r1                  \n"
  26         "       ldmfd   sp!, {lr}               \n"
  27         : [superSP] "=r" (superSP)
  28         : [swi_no] "I" (6 /*SC_SUPERSTATE*/) : "r1"
  29     );
  30
  31     return (APTR)superSP;
  32
  33     AROS_LIBFUNC_EXIT
  34 } /* SuperState() */