arch/m68k-all/exec/cachepostdma.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: CachePostDMA() - Do what is necessary for DMA.
   6     Lang: english
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <exec/types.h>
  11 #include <exec/execbase.h>
  12 #include <aros/libcall.h>
  13
  14 extern void AROS_SLIB_ENTRY(CachePostDMA_00,Exec,128)(void);
  15 extern void AROS_SLIB_ENTRY(CachePostDMA_30,Exec,128)(void);
  16 extern void AROS_SLIB_ENTRY(CachePostDMA_40,Exec,128)(void);
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <proto/exec.h>
  21
  22         AROS_LH3(void, CachePostDMA,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(APTR,    address, A0),
  26         AROS_LHA(ULONG *, length,  A1),
  27         AROS_LHA(ULONG,   flags,  D0),
  28
  29 /*  LOCATION */
  30         struct ExecBase *, SysBase, 128, Exec)
  31
  32 /*  FUNCTION
  33         Do everything necessary to make CPU caches aware that a DMA has
  34         happened.
  35
  36     INPUTS
  37         address - Virtual address of memory affected by the DMA
  38         *length - Number of bytes affected
  39         flags   - DMA_NoModify    - Indicate that the memory did not change.
  40                   DMA_ReadFromRAM - Indicate that the DMA goes from RAM
  41                                     to the device. Set this bit in
  42                                     both calls.
  43
  44     RESULT
  45
  46     NOTES
  47         DMA must follow a call to CachePostDMA() and must be followed
  48         by a call to CachePostDMA().
  49
  50     EXAMPLE
  51
  52     BUGS
  53
  54     SEE ALSO
  55         CachePostDMA()
  56
  57     INTERNALS
  58
  59 ******************************************************************************/
  60 {
  61     AROS_LIBFUNC_INIT
  62     void (*func)(void);
  63
  64     /* When called the first time, this patches up the
  65      * Exec syscall table to directly point to the right routine.
  66      */
  67     Disable();
  68     if (SysBase->AttnFlags & AFF_68040) {
  69         /* 68040 support */
  70         func = AROS_SLIB_ENTRY(CachePostDMA_40, Exec, 128);
  71     } else if (SysBase->AttnFlags & AFF_68030) {
  72         /* 68030 support */
  73         func = AROS_SLIB_ENTRY(CachePostDMA_30, Exec, 128);
  74     } else {
  75         /* Everybody else (68000, 68010) */
  76         func = AROS_SLIB_ENTRY(CachePostDMA_00, Exec, 128);
  77     }
  78
  79     SetFunction((struct Library *)SysBase, -LIB_VECTSIZE * 128, func);
  80     Enable();
  81
  82     /* Call 'myself', which is now pointing to the correct routine */
  83     return CachePostDMA(address, length, flags);
  84
  85     AROS_LIBFUNC_EXIT
  86 } /* CachePostDMA */
  87