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+;******************************************************************************
+;
+;   (C) Copyright MICROSOFT Corp. 1986
+;
+;   Title:    CEMM.EXE - COMPAQ Expanded Memory Manager 386 Driver
+;               EMMLIB.LIB - Expanded Memory Manager Library
+;
+;   Module:   EMMDEF.INC - defines for EMM code.
+;
+;   Version:  0.04
+;
+;   Date:     June 21, 1986
+;
+;******************************************************************************
+;
+;   Change log:
+;
+;     DATE    REVISION                  DESCRIPTION
+;   --------  --------  -------------------------------------------------------
+;   06/21/86  Original
+;   06/25/86  0.02      Changed HANDLE_CNT to 255 to match LIM spec (SBP).
+;   06/28/86  0.02      Name change from CEMM386 to CEMM (SBP).
+;   07/06/86  0.04      Changed save area struct (SBP).
+;   05/25/88            Changed to meet LIM 4.0 Spec (PC)
+;******************************************************************************
+ifndef  INC_LIST
+.xlist
+endif
+
+;******************************************************************************
+;       G E N E R A L   D E F I N E S
+;******************************************************************************
+EMM_PAGE_CNT    = 2048                  ; maximum of 2048 EMM pages (32MB)
+HANDLE_CNT      = 255                   ; maximum of 255 EMM handles
+FRS_COUNT       = 16                    ; number of 'Fast Register Sets'
+
+EMM32_PHYS_PAGES = 4                            ; page frame contains 4 pages
+;
+; The 0 to 1M contains 64 physical pages.  Of these we are not mapping anything
+; between E000 and FFFF, 0000 and 4000.  So the Maximum physcial pages we can
+; get for mapping is 40.
+
+TOT_PHYS_PAGES  equ     64
+MAX_PHYS_PAGES  equ     40                      ; Life, the Universe
+                                                ; and Everything
+PAGE_SIZE       = 1000h
+;
+; Of the above mappable pages the regions C000h to Dfffh have to be searched
+; for the mappable pages.
+;
+ABOVE_CONV_STRT_SEG equ 0C000h
+ABOVE_CONV_STRT_PG  equ ABOVE_CONV_STRT_SEG SHR 10
+;
+ABOVE_CONV_END_SEG  equ 0DC00h
+ABOVE_CONV_END_PG   equ ABOVE_CONV_END_SEG SHR  10
+;
+MAX_ABOVE_CONV_PAGES    EQU 8
+;
+; Also the system memory mappable region starts at 4000h
+;
+CONV_STRT_SEG       equ 4000h
+CONV_STRT_PG        equ CONV_STRT_SEG SHR 10
+;
+NUM_CONV_PGS        equ (0A000h -4000h) SHR 10
+;
+; During init we keep track of mappable pages with an array of mappable_segs
+;
+
+PAGE_MAPPABLE       equ     0FFh                    ;
+PAGE_NOT_MAPPABLE   equ       0h                    ;
+
+
+NULL_PAGE       = 0FFFFh
+NULL_HANDLE     = 00FFFh
+
+
+;
+; Flags for memory move/xchg
+;
+Source_GT_Dest_Flag = 80h               ; Source > Destination for copy / xchg
+Overlap_Flag        = 40h               ; Copy overlapping memory
+Backward_Copy_Flag  = 20h               ; copy is going to be backward
+;
+; Flags for PFlag use in Alter Map and Jump
+;
+PFLAG_VM                = 0002h         ; VM bit in High word of EFLAG
+PFLAG_VIRTUAL           = 0020h         ; wheather it's call from virtual or proected mode
+PFLAG_PATCH_CS_IP       = 0008h         ; Tell Protected mode dispatch to
+                                        ; patch new CS:IP onto it's return address
+;******************************************************************************
+;       S T A T U S   D E F I N E S
+;******************************************************************************
+OK                      =       0
+EMM_SW_MALFUNCTION      =       80h
+EMM_HW_MALFUNCTION      =       81h
+INVALID_HANDLE          =       83h
+INVALID_FUNCTION        =       84h
+NO_MORE_HANDLES         =       85h
+SAVED_PAGE_DEALLOC      =       86h
+NOT_ENOUGH_EXT_MEM      =       87h
+NOT_ENOUGH_FREE_MEM     =       88h
+ZERO_PAGES              =       89h
+LOG_PAGE_RANGE          =       8Ah
+PHYS_PAGE_RANGE         =       8Bh
+SAVE_AREA_FULL          =       8Ch
+MAP_PREV_SAVED          =       8Dh
+NO_MAP_SAVED            =       8Eh
+INVALID_SUBFUNCTION     =       8Fh
+
+; LIM 4.0 extras
+
+VALID_OVERLAP           =       92h
+INSUFFICIENT_EMM_PAGES  =       93h
+CONVENTIONAL_EMM_OVERLAP=       94h
+INVALID_OFFSET          =       95h
+INVALID_REGION_LENGTH   =       96h
+OVERLAPPING_EXCHANGE    =       97h
+INVALID_MEMORY_TYPE     =       98h
+FRSETS_UNSUPPORTED      =       99h
+INVALID_FRSET           =       9Ah
+NO_MORE_FRSETS          =       9Bh
+FRSET_NON_ZERO          =       9Ch
+FRSET_UNDEFINED         =       9Dh
+FRSET_NO_DMA            =       9Eh
+FRSET_INVALID_DMA       =       9Fh
+HANDLE_NAME_NOT_FOUND   =      0A0h
+DUPLICATE_HANDLE_NAME   =      0A1h
+INVALID_WRAPAROUND      =      0A2h
+SOURCE_CORRUPTED        =      0A3h
+ACCESS_DENIED           =      0A4h
+
+
+;******************************************************************************
+;       GET/SET PAGE MAP SUBFUNCTION CODES
+;******************************************************************************
+GSPM_GET        equ     0
+GSPM_SET        equ     1
+GSPM_GETSET     equ     2
+GSPM_SIZE       equ     3
+
+;
+; OSEnabled Values
+;
+OS_IDLE         equ     0
+OS_ENABLED      equ     1
+OS_DISABLED     equ     2
+
+;******************************************************************************
+;        S T R U C T U R E S
+;******************************************************************************
+
+;
+;  stack frame after pushad on real/virtual mode entry
+;
+r67_Frame       struc
+rDI     dd      ?
+rSI     dd      ?
+rBP     dd      ?
+rSP     dd      ?
+rBX     dd      ?
+rDX     dd      ?
+rCX     dd      ?
+rAX     dd      ?
+retaddr dw      ?
+rCS     dw      ?
+PFlag   dw      ?
+rDS     dw      ?
+rES     dw      ?
+rGS     dw      ?
+rFS     dw      ?
+r67_Frame       ends
+
+
+;
+; for _handle_table
+;
+HandleTable_struc       struc
+ht_index        dw      NULL_PAGE       ; index into emm_page for handle's pgs
+ht_count        dw      0               ; number of emm_pages for this handle
+HandleTable_struc       ends
+
+;
+; for _save_area
+;
+SaveMap_struc   struc
+s_handle        dw      NULL_HANDLE                             ; owning handle
+s_map           dw      EMM32_PHYS_PAGES dup (NULL_PAGE)        ; EMM page #s
+SaveMap_struc   ends
+
+;
+; structure linking segment with physical page number
+;
+Mappable_Page   struc
+mappable_seg    dw      ?
+mappable_pg     dw      ?
+Mappable_Page   ends
+
+;
+; Get Partial Page Map
+;
+gppm_struc      struc
+gppm_count      dw      ?
+gppm_segs       dw      ?
+gppm_struc      ends
+
+;
+; Structures used as arguments to Map Handle Array function
+;
+
+; For subfunction 0:
+mha_array0      struc
+mha0_log_pg     dw      ?
+mha0_phys_pg    dw      ?
+mha_array0      ends
+
+; For subfunction 1:
+mha_array1      struc
+mha1_log_pg     dw      ?
+mha1_seg        dw      ?
+mha_array1      ends
+
+; Used by Map and Jump and Map and Call -- Identical to mha_array0 and 1
+log_phys_map_struct  struc
+log_page_number      dw ?
+phys_page_number_seg dw ?
+log_phys_map_struct  ends
+
+; Map and Jump structure
+maj_struct      struc
+maj_target_address   dd ?
+maj_log_phys_map_len db ?
+maj_map_address      dd ?
+maj_struct      ends
+
+; Map and Call structure
+mac_struct      struc
+mac_target_address   dd ?
+mac_new_page_map_len db ?
+mac_new_map_address  dd ?
+mac_old_page_map_len db ?
+mac_old_map_address  dd ?
+mac_reserved         dw 4 dup (?)
+mac_struct      ends
+
+; Move / Exchange memory structure
+mem_memory_descriptor_struct    struc
+mem_memory_type      db ?
+mem_handle           dw ?
+mem_initial_offset   dw ?
+mem_initial_seg_page dw ?
+mem_memory_descriptor_struct    ends
+
+
+mem_struct      struc
+mem_region_length   dd  ?
+mem_source          db  (SIZE mem_memory_descriptor_struct) dup (?)
+mem_dest            db  (SIZE mem_memory_descriptor_struct) dup (?)
+mem_struct      ends
+
+;
+; Fast Register Set Description
+;
+FRS_struc       struc
+FRS_Window      dw      MAX_PHYS_PAGES dup (NULL_PAGE)  ; emm page numbers
+FRS_alloc       dw      0                               ; Is this set allocated
+FRS_struc       ends
+
+        page
+;****************************************************************************
+;
+;   Dword_Align -- Aligns code to dword boundry by inserting nops
+;
+;****************************************************************************
+
+Dword_Align MACRO Seg_Name
+IF (($ - OFFSET Seg_Name:0) MOD 4)
+        db      90h                  ;; Nop in code / else byte of 90h in data
+        Dword_Align Seg_Name
+ENDIF
+            ENDM
+
+        page
+;***********************************************
+;
+; Validate_Handle - check the handle in DX
+;
+;       ENTRY:  Handle as per LIM4.0 spec. in DX
+;
+;       EXIT:   If the handle is invalid jump To Death_Label, otherwise,
+;               EDX points to the _handle_table entry for the handle
+;
+;       USES:   EDX
+;
+;***********************************************
+Validate_Handle MACRO   Death_Label
+
+        cmp     dx, [_handle_table_size]        ;Q: handle in range ?
+        jae     Death_Label                     ;  N: go to error label
+        shl     dx, 2                           ;  Y: convert handle to
+        add     dx, offset _handle_table        ;     pointer
+        xchg    bx, dx
+        cmp     [bx.ht_index], NULL_PAGE        ;Q: is this handle active ?
+        xchg    bx, dx
+        je      Death_Label                     ;  N: return error
+
+        ENDM
+
+;***********************************************
+;
+; Handle2HandlePtr - convert the handle in DX to
+;               points into handle_table
+;
+;       ENTRY:  Handle as per LIM4.0 spec. in DX
+;
+;       EXIT:   EDX points to the _handle_table entry for the handle
+;
+;       USES:   EDX
+;
+;***********************************************
+Handle2HandlePtr MACRO
+
+        shl     dx, 2                           ;  Y: convert handle to
+        add     dx, offset _handle_table        ;     pointer
+
+        ENDM
+
+.list           ; end of EMMDEF.INC
+
+
+
+
\ No newline at end of file