arch/m68k-all/kernel/setprotection.c

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