arch/m68k-all/exec/cachepredma.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: CachePreDMA() - Do what is necessary for DMA.
   6     Lang: english
   7 */
   8
   9 #define DEBUG 0
  10
  11 #include <aros/debug.h>
  12 #include <exec/types.h>
  13 #include <aros/libcall.h>
  14
  15 extern void AROS_SLIB_ENTRY(CachePreDMA_00,Exec,127)(void);
  16 extern void AROS_SLIB_ENTRY(CachePreDMA_40,Exec,127)(void);
  17
  18 #include <proto/exec.h>
  19
  20 /* See rom/exec/cachepredma.c for documentation */
  21
  22 AROS_LH3(APTR, CachePreDMA,
  23     AROS_LHA(APTR,    address, A0),
  24     AROS_LHA(ULONG *, length,  A1),
  25     AROS_LHA(ULONG,   flags,  D0),
  26     struct ExecBase *, SysBase, 127, Exec)
  27 {
  28     AROS_LIBFUNC_INIT
  29     void (*func)(void);
  30
  31     /* When called the first time, this patches up the
  32      * Exec syscall table to directly point to the right routine.
  33      */
  34     Disable();
  35     if (SysBase->AttnFlags & AFF_68040) {
  36         /* 68040 support */
  37         func = AROS_SLIB_ENTRY(CachePreDMA_40, Exec, 127);
  38     } else {
  39         /* Everybody else (68000, 68010) */
  40         func = AROS_SLIB_ENTRY(CachePreDMA_00, Exec, 127);
  41     }
  42
  43     SetFunction((struct Library *)SysBase, -LIB_VECTSIZE * 127, func);
  44     Enable();
  45
  46     /* Call 'myself', which is now pointing to the correct routine */
  47     return CachePreDMA(address, length, flags);
  48
  49     AROS_LIBFUNC_EXIT
  50 } /* CachePreDMA() */