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104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* COPYRIGHT: GPLv2+ - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h
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* PURPOSE: DOS EMS Driver
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*/
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#ifndef _EMSDRV_H_
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#define _EMSDRV_H_
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/* DEFINITIONS ****************************************************************/
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#define EMS_VERSION_NUM 0x40
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#define EMS_INTERRUPT_NUM 0x67
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#define EMS_SEGMENT 0xD000 // Default segment
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// Specification: Operating system handle 0x0000; user handles from 0x0001 to 0x00FE
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#define EMS_MAX_HANDLES 255
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#define EMS_PAGE_BITS 14
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#define EMS_PAGE_SIZE (1 << EMS_PAGE_BITS)
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#define EMS_PHYSICAL_PAGES 4
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/* 16 MB of EMS memory */
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#define EMS_TOTAL_PAGES 1024
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#define EMS_STATUS_SUCCESS 0x00
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#define EMS_STATUS_INTERNAL_ERROR 0x80
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#define EMS_STATUS_INVALID_HANDLE 0x83
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#define EMS_STATUS_UNKNOWN_FUNCTION 0x84
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#define EMS_STATUS_NO_MORE_HANDLES 0x85
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#define EMS_STATUS_INSUFFICIENT_PAGES 0x88
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#define EMS_STATUS_ZERO_PAGES 0x89
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#define EMS_STATUS_INV_LOGICAL_PAGE 0x8A
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#define EMS_STATUS_INV_PHYSICAL_PAGE 0x8B
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#define EMS_STATUS_INVALID_SUBFUNCTION 0x8F
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#define EMS_STATUS_HANDLE_NOT_FOUND 0xA0
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#define EMS_STATUS_UNNAMED_HANDLE 0xA1
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#define EMS_STATUS_HANDLE_ALREADY_EXISTS 0xA1
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typedef struct _EMS_HANDLE
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{
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BOOLEAN Allocated;
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USHORT PageCount;
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LIST_ENTRY PageList;
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UCHAR Name[8];
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} EMS_HANDLE, *PEMS_HANDLE;
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typedef struct _EMS_PAGE
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{
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LIST_ENTRY Entry;
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USHORT Handle;
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} EMS_PAGE, *PEMS_PAGE;
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#pragma pack(push, 1)
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typedef struct _EMS_HANDLE_PAGE_INFO
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{
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USHORT Handle;
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USHORT PageCount;
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} EMS_HANDLE_PAGE_INFO, *PEMS_HANDLE_PAGE_INFO;
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typedef struct _EMS_HANDLE_DIR_ENTRY
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{
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USHORT Handle;
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UCHAR Name[8];
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} EMS_HANDLE_DIR_ENTRY, *PEMS_HANDLE_DIR_ENTRY;
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typedef struct _EMS_COPY_DATA
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{
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ULONG RegionLength;
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UCHAR SourceType;
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USHORT SourceHandle;
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USHORT SourceOffset;
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USHORT SourceSegment;
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UCHAR DestType;
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USHORT DestHandle;
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USHORT DestOffset;
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USHORT DestSegment;
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} EMS_COPY_DATA, *PEMS_COPY_DATA;
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typedef struct _EMS_MAPPABLE_PHYS_PAGE
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{
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USHORT PageSegment;
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USHORT PageNumber;
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} EMS_MAPPABLE_PHYS_PAGE, *PEMS_MAPPABLE_PHYS_PAGE;
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typedef struct _EMS_HARDWARE_INFO
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{
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WORD RawPageSize;
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WORD AlternateRegSets;
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WORD ContextAreaSize;
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WORD DmaRegisterSets;
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WORD DmaChannelOperation;
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} EMS_HARDWARE_INFO, *PEMS_HARDWARE_INFO;
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#pragma pack(pop)
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/* FUNCTIONS ******************************************************************/
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BOOLEAN EmsDrvInitialize(USHORT Segment, ULONG TotalPages);
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VOID EmsDrvCleanup(VOID);
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#endif /* _EMSDRV_H_ */
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