reactos/subsystems/mvdm/ntvdm/ems.h

   1 /*
   2  * COPYRIGHT:       GPLv2+ - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            ems.h
   5  * PURPOSE:         Expanded Memory Support
   6  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   7  */
   8
   9 #ifndef _EMS_H_
  10 #define _EMS_H_
  11
  12 /* DEFINITIONS ****************************************************************/
  13
  14 #define EMS_INTERRUPT_NUM   0x67
  15 #define EMS_SEGMENT         0xD000
  16 #define EMS_MAX_HANDLES     16
  17 #define EMS_TOTAL_PAGES     256
  18 #define EMS_PAGE_BITS       14
  19 #define EMS_PAGE_SIZE       (1 << EMS_PAGE_BITS)
  20 #define EMS_ADDRESS         0xA00000
  21 #define EMS_PHYSICAL_PAGES  4
  22
  23 #define EMS_STATUS_OK                   0x00
  24 #define EMS_STATUS_INTERNAL_ERROR       0x80
  25 #define EMS_STATUS_INVALID_HANDLE       0x83
  26 #define EMS_STATUS_NO_MORE_HANDLES      0x85
  27 #define EMS_STATUS_INSUFFICIENT_PAGES   0x88
  28 #define EMS_STATUS_ZERO_PAGES           0x89
  29 #define EMS_STATUS_INV_LOGICAL_PAGE     0x8A
  30 #define EMS_STATUS_INV_PHYSICAL_PAGE    0x8B
  31 #define EMS_STATUS_UNKNOWN_FUNCTION     0x8F
  32
  33 #define ARRAY_INDEX(ptr, array) ((ULONG)(((ULONG_PTR)(ptr) - (ULONG_PTR)(array)) / sizeof(*array)))
  34
  35 typedef struct _EMS_HANDLE
  36 {
  37     BOOLEAN Allocated;
  38     USHORT PageCount;
  39     LIST_ENTRY PageList;
  40 } EMS_HANDLE, *PEMS_HANDLE;
  41
  42 typedef struct _EMS_PAGE
  43 {
  44     LIST_ENTRY Entry;
  45     USHORT Handle;
  46 } EMS_PAGE, *PEMS_PAGE;
  47
  48 #pragma pack(push, 1)
  49
  50 typedef struct _EMS_COPY_DATA
  51 {
  52     ULONG RegionLength;
  53     UCHAR SourceType;
  54     USHORT SourceHandle;
  55     USHORT SourceOffset;
  56     USHORT SourceSegment;
  57     UCHAR DestType;
  58     USHORT DestHandle;
  59     USHORT DestOffset;
  60     USHORT DestSegment;
  61 } EMS_COPY_DATA, *PEMS_COPY_DATA;
  62
  63 #pragma pack(pop)
  64
  65 /* FUNCTIONS ******************************************************************/
  66
  67 VOID EmsInitialize(VOID);
  68 VOID EmsCleanup(VOID);
  69
  70 #endif // _EMS_H_
  71
  72 /* EOF */