arch/m68k-all/kernel/setprotection.c

   1 /*
   2     Copyright © 1995-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/kernel.h>
   7 #include <aros/libcall.h>
   8
   9 #include <kernel_base.h>
  10 #include <kernel_intern.h>
  11
  12 #include <proto/kernel.h>
  13
  14 /* See rom/kernel/setprotection.c for documentation */
  15
  16 AROS_LH3(void, KrnSetProtection,
  17     AROS_LHA(void *, address, A0),
  18     AROS_LHA(uint32_t, length, D0),
  19     AROS_LHA(KRN_MapAttr, flags, D1),
  20     struct KernelBase *, KernelBase, 21, Kernel)
  21 {
  22     AROS_LIBFUNC_INIT
  23
  24     BOOL invalid = (flags & (MAP_Readable | MAP_Writable | MAP_Executable)) == 0;
  25     BOOL readonly = (flags & MAP_Writable) == 0;
  26     BOOL supervisor = (flags & MAP_Supervisor) != 0;
  27     UBYTE cm = (flags & MAP_CacheInhibit) ? CM_SERIALIZED : ((flags & MAP_WriteThrough) ? CM_WRITETHROUGH : CM_COPYBACK);
  28
  29     /* We need MAP_Supervisor and MAP_CacheInhibitSerialized */
  30
  31     if ((ULONG)address < 0x00200000 && cm == CM_SERIALIZED)
  32         cm = CM_NONCACHEABLE; /* Chip RAM does not need to be non-cacheable + serialized, only noncacheable */
  33
  34     map_region(KernelBase, address, NULL, length, invalid, readonly, supervisor, cm);
  35
  36     AROS_LIBFUNC_EXIT
  37 }