rom/exec/setsr.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: SetSR() - Modify the CPU status register.
   6     Lang: english
   7 */
   8
   9 /*****************************************************************************
  10
  11     NAME */
  12 #include <proto/exec.h>
  13
  14         AROS_LH2(ULONG, SetSR,
  15
  16 /*  SYNOPSIS */
  17         AROS_LHA(ULONG, newSR, D0),
  18         AROS_LHA(ULONG, mask,  D1),
  19
  20 /*  LOCATION */
  21         struct ExecBase *, SysBase, 24, Exec)
  22
  23 /*  FUNCTION
  24         Read/Modify the CPU status register in an easy way. Only the bits
  25         set it the mask parameter will be changed.
  26
  27         The bits in the register mapped to those of the Motorola MC680x0
  28         family of microprocessors.
  29
  30     INPUTS
  31         newSR   -   The new contents of the status register.
  32         mask    -   Mask of bits to change.
  33
  34     RESULT
  35         The old contents of the status register or ~0UL if this function
  36         is not implemented.
  37
  38     NOTES
  39         This function is of limited use.
  40
  41     EXAMPLE
  42         You can read the status register by calling SetSR(0,0).
  43
  44     BUGS
  45         This function may do nothing on non-mc680x0 systems.
  46
  47     SEE ALSO
  48
  49     INTERNALS
  50
  51 ******************************************************************************/
  52 {
  53     AROS_LIBFUNC_INIT
  54
  55     /*
  56         You can just as easily leave this function as a NOP, or alternatively
  57         map the flag bits to your local processor and implement the function.
  58
  59         I used to have this as a print, but it is used by the math*.library's
  60     */
  61
  62     return ~0UL;
  63
  64     AROS_LIBFUNC_EXIT
  65 } /* SetSR() */