hal/halx86/dma.c

   1 /* $Id$
   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 <ddk/ntddk.h>
  15
  16 #include <internal/debug.h>
  17 #include <hal.h>
  18
  19 ADAPTER_OBJECT AdapterObjects[] = {
  20   { 0, (PVOID)0x87, (PVOID)0x1, (PVOID)0x0, { 0 }, NULL },
  21   { 1, (PVOID)0x83, (PVOID)0x3, (PVOID)0x2, { 0 }, NULL },
  22   { 2, (PVOID)0x81, (PVOID)0x5, (PVOID)0x4, { 0 }, NULL },
  23   { 3, (PVOID)0x82, (PVOID)0x7, (PVOID)0x6, { 0 }, NULL } };
  24
  25
  26 /* FUNCTIONS *****************************************************************/
  27
  28 PVOID STDCALL
  29 HalAllocateCommonBuffer (PADAPTER_OBJECT                AdapterObject,
  30                          ULONG                  Length,
  31                          PPHYSICAL_ADDRESS      LogicalAddress,
  32                          BOOLEAN                        CacheEnabled)
  33 /*
  34  * FUNCTION: Allocates memory that is visible to both the processor(s) and
  35  * a dma device
  36  * ARGUMENTS:
  37  *         AdapterObject = Adapter object representing the bus master or
  38  *                         system dma controller
  39  *         Length = Number of bytes to allocate
  40  *         LogicalAddress = Logical address the driver can use to access the
  41  *                          buffer
  42  *         CacheEnabled = Specifies if the memory can be cached
  43  * RETURNS: The base virtual address of the memory allocated
  44  *          NULL on failure
  45  */
  46 {
  47    UNIMPLEMENTED;
  48 }
  49
  50 BOOLEAN STDCALL
  51 HalFlushCommonBuffer (ULONG     Unknown1,
  52                       ULONG     Unknown2,
  53                       ULONG     Unknown3,
  54                       ULONG     Unknown4,
  55                       ULONG     Unknown5,
  56                       ULONG     Unknown6,
  57                       ULONG     Unknown7,
  58                       ULONG     Unknown8)
  59 {
  60    return TRUE;
  61 }
  62
  63 VOID STDCALL
  64 HalFreeCommonBuffer (PADAPTER_OBJECT            AdapterObject,
  65                      ULONG                      Length,
  66                      PHYSICAL_ADDRESS   LogicalAddress,
  67                      PVOID                      VirtualAddress,
  68                      BOOLEAN                    CacheEnabled)
  69 {
  70    MmFreeContiguousMemory(VirtualAddress);
  71 }
  72
  73 PADAPTER_OBJECT STDCALL
  74 HalGetAdapter (PDEVICE_DESCRIPTION      DeviceDescription,
  75                PULONG                   NumberOfMapRegisters)
  76 /*
  77  * FUNCTION: Returns a pointer to an adapter object for the DMA device
  78  * defined in the device description structure
  79  * ARGUMENTS:
  80  *        DeviceDescription = Structure describing the attributes of the device
  81  *        NumberOfMapRegisters (OUT) = Returns the maximum number of map
  82  *                                     registers the device driver can
  83  *                                     allocate for DMA transfer operations
  84  * RETURNS: The allocated adapter object on success
  85  *          NULL on failure
  86  */
  87 {
  88   /* Validate parameters in device description, and return a pointer to
  89      the adapter object for the requested dma channel */
  90   if( DeviceDescription->Version != DEVICE_DESCRIPTION_VERSION )
  91     return NULL;
  92   if( DeviceDescription->Master )
  93     return NULL;
  94   if( DeviceDescription->ScatterGather )
  95     return NULL;
  96   if( DeviceDescription->AutoInitialize )
  97     return NULL;
  98   if( DeviceDescription->Dma32BitAddress )
  99     return NULL;
 100   if( DeviceDescription->InterfaceType != Isa )
 101      return NULL;
 102   /*  if( DeviceDescription->DmaWidth != Width8Bits )
 103       return NULL;*/
 104   *NumberOfMapRegisters = 0x10;
 105   AdapterObjects[DeviceDescription->DmaChannel].Buffer = 0;
 106   return &AdapterObjects[DeviceDescription->DmaChannel];
 107 }
 108
 109 ULONG STDCALL
 110 HalReadDmaCounter (PADAPTER_OBJECT      AdapterObject)
 111 {
 112    UNIMPLEMENTED;
 113 }
 114
 115 /* EOF */