arch/arm-raspi/kernel/issuper.c

   1 /*
   2     Copyright © 2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/kernel.h>
   7 #include <aros/libcall.h>
   8
   9 #include <aros/arm/cpucontext.h>
  10
  11 #include <kernel_base.h>
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/kernel.h>
  17
  18 AROS_LH0I(int, KrnIsSuper,
  19
  20 /*  SYNOPSIS */
  21
  22 /*  LOCATION */
  23         struct KernelBase *, KernelBase, 13, Kernel)
  24
  25 /*  FUNCTION
  26         Determine if the caller is running in supervisor mode
  27
  28     INPUTS
  29         None
  30
  31     RESULT
  32         Nonzero for supervisor mode, zero for user mode
  33
  34     NOTES
  35         Callers should only test the return value against zero.
  36         Nonzero values may actually be different, since they
  37         may carry some private implementation-dependent information
  38         (like CPU privilege level, for example).
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45
  46     INTERNALS
  47
  48 ******************************************************************************/
  49 {
  50     AROS_LIBFUNC_INIT
  51
  52     register unsigned int reg;
  53     asm volatile("mrs %[reg], cpsr" : [reg] "=r" (reg) );
  54
  55     return !(((reg & CPUMODE_MASK) == CPUMODE_USER) || ((reg & CPUMODE_MASK) == CPUMODE_SYSTEM));
  56
  57     AROS_LIBFUNC_EXIT
  58 }