148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
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/*++ BUILD Version: 0001 // Increment this if a change has global effects
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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ixfwhal.h
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Abstract:
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This header file defines the private Hardware Architecture Layer (HAL)
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Intel x86 specific interfaces, defines and structures.
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Author:
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Jeff Havens (jhavens) 20-Jun-91
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Revision History:
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--*/
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#ifndef _IXHALP_
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#define _IXHALP_
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//
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// The MAXIMUM_MAP_BUFFER_SIZE defines the maximum map buffers which the system
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// will allocate for devices which require phyically contigous buffers.
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//
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#define MAXIMUM_MAP_BUFFER_SIZE 0x1000000
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//
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// Define the initial buffer allocation size for a map buffers.
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//
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#define INITIAL_MAP_BUFFER_SIZE 0x20000
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//
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// Define the incremental buffer allocation for a map buffers.
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//
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#define INCREMENT_MAP_BUFFER_SIZE 0x10000
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//
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// Define the maximum number of map registers that can be requested at one time
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// if actual map registers are required for the transfer.
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//
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#define MAXIMUM_ISA_MAP_REGISTER 16
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//
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// Define the maximum physical address which can be handled by an Isa card.
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//
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#define MAXIMUM_PHYSICAL_ADDRESS 0x01000000
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//
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// Define adapter object structure.
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//
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typedef struct _ADAPTER_OBJECT {
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CSHORT Type;
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CSHORT Size;
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ULONG MapRegistersPerChannel;
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PVOID AdapterBaseVa;
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PVOID MapRegisterBase;
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ULONG NumberOfMapRegisters;
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UCHAR ChannelNumber;
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UCHAR AdapterNumber;
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UCHAR AdapterMode;
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UCHAR ExtendedModeFlags;
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USHORT DmaPortAddress;
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BOOLEAN NeedsMapRegisters;
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BOOLEAN IsaDevice;
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BOOLEAN MasterDevice;
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BOOLEAN Width16Bits;
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BOOLEAN AdapterInUse;
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PUCHAR PagePort;
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} ADAPTER_OBJECT;
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//
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// Define map register translation entry structure.
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//
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typedef struct _TRANSLATION_ENTRY {
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PVOID VirtualAddress;
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ULONG PhysicalAddress;
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ULONG Index;
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} TRANSLATION_ENTRY, *PTRANSLATION_ENTRY;
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//
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// Define External data structures.
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//
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//
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// Some devices require a phyicially contiguous data buffers for DMA transfers.
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// Map registers are used give the appearance that all data buffers are
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// contiguous. In order to pool all of the map registers a master
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// adapter object is used. This object is allocated and saved internal to this
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// file. It contains a bit map for allocation of the registers and a queue
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// for requests which are waiting for more map registers. This object is
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// allocated during the first request to allocate an adapter which requires
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// map registers.
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//
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// In this system, the map registers are translation entries which point to
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// map buffers. Map buffers are physically contiguous and have physical memory
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// addresses less than 0x01000000. All of the map registers are allocated
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// initialially; however, the map buffers are allocated base in the number of
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// adapters which are allocated.
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//
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// If the master adapter is NULL in the adapter object then device does not
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// require any map registers.
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//
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extern PADAPTER_OBJECT MasterAdapterObject;
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extern POBJECT_TYPE IoAdapterObjectType;
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extern BOOLEAN LessThan16Mb;
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//
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// Define function prototypes.
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//
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BOOLEAN
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HalpGrowMapBuffers(
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PADAPTER_OBJECT AdapterObject,
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ULONG Amount
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);
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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 MapRegisterBase
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);
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VOID
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HalpInitializeDisplay(
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IN PUSHORT VideoBufferAddress
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);
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#endif // _IXHALP_
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