120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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ixphwsup.c
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Abstract:
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This module contains the IopXxx routines for the NT I/O system that
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are hardware dependent. Were these routines not hardware dependent,
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they would normally reside in the internal.c module.
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Author:
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Darryl E. Havens (darrylh) 11-Apr-1990
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Environment:
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Kernel mode, local to I/O system
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Revision History:
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--*/
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#include "bootx86.h"
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#include "arc.h"
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#include "ixfwhal.h"
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#include "eisa.h"
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PADAPTER_OBJECT
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IopAllocateAdapter(
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IN ULONG MapRegistersPerChannel,
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IN PVOID AdapterBaseVa,
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IN PVOID ChannelNumber
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)
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/*++
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Routine Description:
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This routine allocates and initializes an adapter object to represent an
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adapter or a DMA controller on the system. If no map registers are required
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then a standalone adapter object is allocated with no master adapter.
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If map registers are required, then a master adapter object is used to
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allocate the map registers. For Isa systems these registers are really
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phyically contiguous memory pages.
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Arguments:
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MapRegistersPerChannel - Specifies the number of map registers that each
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channel provides for I/O memory mapping.
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AdapterBaseVa - Address of the the DMA controller.
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ChannelNumber - Unused.
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Return Value:
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The function value is a pointer to the allocate adapter object.
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--*/
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{
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PADAPTER_OBJECT AdapterObject;
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CSHORT Size;
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//
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// Determine the size of the adapter.
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//
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Size = sizeof( ADAPTER_OBJECT );
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//
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// Now create the adapter object.
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//
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AdapterObject = FwAllocateHeap(Size);
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//
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// If the adapter object was successfully created, then attempt to insert
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// it into the the object table.
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//
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if (AdapterObject) {
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RtlZeroMemory(AdapterObject, Size);
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//
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// Initialize the adapter object itself.
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//
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AdapterObject->Type = IO_TYPE_ADAPTER;
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AdapterObject->Size = Size;
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AdapterObject->MapRegistersPerChannel = 0;
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AdapterObject->AdapterBaseVa = AdapterBaseVa;
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AdapterObject->PagePort = NULL;
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AdapterObject->AdapterInUse = FALSE;
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} else {
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//
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// An error was incurred for some reason. Set the return value
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// to NULL.
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//
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return(NULL);
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}
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return AdapterObject;
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}
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