reactos/hal/halx86/dma.c

   1 /* $Id: dma.c,v 1.2 2002/09/07 15:12:10 chorns Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/hal/x86/dma.c
   6  * PURPOSE:         DMA functions
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <hal.h>
  15
  16 #define NDEBUG
  17 #include <internal/debug.h>
  18
  19
  20 ADAPTER_OBJECT AdapterObjects[] = {
  21   { 0, (PVOID)0x87, (PVOID)0x1, (PVOID)0x0, 0, NULL },
  22   { 1, (PVOID)0x83, (PVOID)0x3, (PVOID)0x2, 0, NULL },
  23   { 2, (PVOID)0x81, (PVOID)0x5, (PVOID)0x4, 0, NULL },
  24   { 3, (PVOID)0x82, (PVOID)0x7, (PVOID)0x6, 0, NULL } };
  25
  26
  27 /* FUNCTIONS *****************************************************************/
  28
  29 PVOID STDCALL
  30 HalAllocateCommonBuffer (PADAPTER_OBJECT                AdapterObject,
  31                          ULONG                  Length,
  32                          PPHYSICAL_ADDRESS      LogicalAddress,
  33                          BOOLEAN                        CacheEnabled)
  34 /*
  35  * FUNCTION: Allocates memory that is visible to both the processor(s) and
  36  * a dma device
  37  * ARGUMENTS:
  38  *         AdapterObject = Adapter object representing the bus master or
  39  *                         system dma controller
  40  *         Length = Number of bytes to allocate
  41  *         LogicalAddress = Logical address the driver can use to access the
  42  *                          buffer
  43  *         CacheEnabled = Specifies if the memory can be cached
  44  * RETURNS: The base virtual address of the memory allocated
  45  *          NULL on failure
  46  */
  47 {
  48    UNIMPLEMENTED;
  49 }
  50
  51 BOOLEAN STDCALL
  52 HalFlushCommonBuffer (ULONG     Unknown1,
  53                       ULONG     Unknown2,
  54                       ULONG     Unknown3,
  55                       ULONG     Unknown4,
  56                       ULONG     Unknown5,
  57                       ULONG     Unknown6,
  58                       ULONG     Unknown7,
  59                       ULONG     Unknown8)
  60 {
  61    return TRUE;
  62 }
  63
  64 VOID STDCALL
  65 HalFreeCommonBuffer (PADAPTER_OBJECT            AdapterObject,
  66                      ULONG                      Length,
  67                      PHYSICAL_ADDRESS   LogicalAddress,
  68                      PVOID                      VirtualAddress,
  69                      BOOLEAN                    CacheEnabled)
  70 {
  71    MmFreeContiguousMemory(VirtualAddress);
  72 }
  73
  74 PADAPTER_OBJECT STDCALL
  75 HalGetAdapter (PDEVICE_DESCRIPTION      DeviceDescription,
  76                PULONG                   NumberOfMapRegisters)
  77 /*
  78  * FUNCTION: Returns a pointer to an adapter object for the DMA device
  79  * defined in the device description structure
  80  * ARGUMENTS:
  81  *        DeviceDescription = Structure describing the attributes of the device
  82  *        NumberOfMapRegisters (OUT) = Returns the maximum number of map
  83  *                                     registers the device driver can
  84  *                                     allocate for DMA transfer operations
  85  * RETURNS: The allocated adapter object on success
  86  *          NULL on failure
  87  */
  88 {
  89   /* Validate parameters in device description, and return a pointer to
  90      the adapter object for the requested dma channel */
  91   if( DeviceDescription->Version != DEVICE_DESCRIPTION_VERSION )
  92     return NULL;
  93   if( DeviceDescription->Master )
  94     return NULL;
  95   if( DeviceDescription->ScatterGather )
  96     return NULL;
  97   if( DeviceDescription->AutoInitialize )
  98     return NULL;
  99   if( DeviceDescription->Dma32BitAddresses )
 100     return NULL;
 101   if( DeviceDescription->InterfaceType != Isa )
 102      return NULL;
 103   /*  if( DeviceDescription->DmaWidth != Width8Bits )
 104       return NULL;*/
 105   *NumberOfMapRegisters = 0x10;
 106   AdapterObjects[DeviceDescription->DmaChannel].Buffer = 0;
 107   return &AdapterObjects[DeviceDescription->DmaChannel];
 108 }
 109
 110 ULONG STDCALL
 111 HalReadDmaCounter (PADAPTER_OBJECT      AdapterObject)
 112 {
 113    UNIMPLEMENTED;
 114 }
 115
 116 /* EOF */