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 /* 16 MB of EMS memory */
  23 #define EMS_TOTAL_PAGES     1024
  24
  25 #define EMS_STATUS_OK                   0x00
  26 #define EMS_STATUS_INTERNAL_ERROR       0x80
  27 #define EMS_STATUS_INVALID_HANDLE       0x83
  28 #define EMS_STATUS_NO_MORE_HANDLES      0x85
  29 #define EMS_STATUS_INSUFFICIENT_PAGES   0x88
  30 #define EMS_STATUS_ZERO_PAGES           0x89
  31 #define EMS_STATUS_INV_LOGICAL_PAGE     0x8A
  32 #define EMS_STATUS_INV_PHYSICAL_PAGE    0x8B
  33 #define EMS_STATUS_UNKNOWN_FUNCTION     0x8F
  34
  35 typedef struct _EMS_HANDLE
  36 {
  37     BOOLEAN Allocated;
  38     USHORT PageCount;
  39     LIST_ENTRY PageList;
  40     UCHAR Name[8];
  41 } EMS_HANDLE, *PEMS_HANDLE;
  42
  43 typedef struct _EMS_PAGE
  44 {
  45     LIST_ENTRY Entry;
  46     USHORT Handle;
  47 } EMS_PAGE, *PEMS_PAGE;
  48
  49 #pragma pack(push, 1)
  50
  51 typedef struct _EMS_COPY_DATA
  52 {
  53     ULONG RegionLength;
  54     UCHAR SourceType;
  55     USHORT SourceHandle;
  56     USHORT SourceOffset;
  57     USHORT SourceSegment;
  58     UCHAR DestType;
  59     USHORT DestHandle;
  60     USHORT DestOffset;
  61     USHORT DestSegment;
  62 } EMS_COPY_DATA, *PEMS_COPY_DATA;
  63
  64 typedef struct _EMS_HARDWARE_INFO
  65 {
  66     WORD RawPageSize;
  67     WORD AlternateRegSets;
  68     WORD ContextAreaSize;
  69     WORD DmaRegisterSets;
  70     WORD DmaChannelOperation;
  71 } EMS_HARDWARE_INFO, *PEMS_HARDWARE_INFO;
  72
  73 #pragma pack(pop)
  74
  75 #endif
  76
  77 /* FUNCTIONS ******************************************************************/
  78
  79 BOOLEAN EmsDrvInitialize(ULONG TotalPages);
  80 VOID EmsDrvCleanup(VOID);