reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/emsdrv.h

   1 /*
   2  * COPYRIGHT:       GPLv2+ - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            emsdrv.h
   5  * PURPOSE:         DOS EMS Driver
   6  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   7  */
   8
   9 #ifndef _EMSDRV_H_
  10 #define _EMSDRV_H_
  11
  12 /* DEFINITIONS ****************************************************************/
  13
  14 #define EMS_VERSION_NUM     0x40
  15 #define EMS_INTERRUPT_NUM   0x67
  16 #define EMS_SEGMENT         0xD000
  17 #define EMS_MAX_HANDLES     16
  18 #define EMS_PAGE_BITS       14
  19 #define EMS_PAGE_SIZE       (1 << EMS_PAGE_BITS)
  20 #define EMS_PHYSICAL_PAGES  4
  21
  22 #define EMS_STATUS_OK                   0x00
  23 #define EMS_STATUS_INTERNAL_ERROR       0x80
  24 #define EMS_STATUS_INVALID_HANDLE       0x83
  25 #define EMS_STATUS_NO_MORE_HANDLES      0x85
  26 #define EMS_STATUS_INSUFFICIENT_PAGES   0x88
  27 #define EMS_STATUS_ZERO_PAGES           0x89
  28 #define EMS_STATUS_INV_LOGICAL_PAGE     0x8A
  29 #define EMS_STATUS_INV_PHYSICAL_PAGE    0x8B
  30 #define EMS_STATUS_UNKNOWN_FUNCTION     0x8F
  31
  32 typedef struct _EMS_HANDLE
  33 {
  34     BOOLEAN Allocated;
  35     USHORT PageCount;
  36     LIST_ENTRY PageList;
  37     UCHAR Name[8];
  38 } EMS_HANDLE, *PEMS_HANDLE;
  39
  40 typedef struct _EMS_PAGE
  41 {
  42     LIST_ENTRY Entry;
  43     USHORT Handle;
  44 } EMS_PAGE, *PEMS_PAGE;
  45
  46 #pragma pack(push, 1)
  47
  48 typedef struct _EMS_COPY_DATA
  49 {
  50     ULONG RegionLength;
  51     UCHAR SourceType;
  52     USHORT SourceHandle;
  53     USHORT SourceOffset;
  54     USHORT SourceSegment;
  55     UCHAR DestType;
  56     USHORT DestHandle;
  57     USHORT DestOffset;
  58     USHORT DestSegment;
  59 } EMS_COPY_DATA, *PEMS_COPY_DATA;
  60
  61 typedef struct _EMS_HARDWARE_INFO
  62 {
  63     WORD RawPageSize;
  64     WORD AlternateRegSets;
  65     WORD ContextAreaSize;
  66     WORD DmaRegisterSets;
  67     WORD DmaChannelOperation;
  68 } EMS_HARDWARE_INFO, *PEMS_HARDWARE_INFO;
  69
  70 #pragma pack(pop)
  71
  72 #endif
  73
  74 /* FUNCTIONS ******************************************************************/
  75
  76 BOOLEAN EmsDrvInitialize(ULONG TotalPages);
  77 VOID EmsDrvCleanup(VOID);