;************************************************
;***                                          ***
;***    XmsDefs.ASM                           ***
;***                                          ***
;***    Contains definitions for XMS routines ***
;***                                          ***
;************************************************

;
;   Define the extended function interrupt which gives us the
;   XMS handler address:
;
XFunc       equ     2fh

;
;   Define the function code for XMS, and the two sub-codes:
;
XFuncXMS        equ     43h
XFuncXMSPres    equ     0h
XFuncXMSEntry   equ     10h

;
;   Define the XMSPresent response:
;
XMSPresent      equ     80h


;
;   Now define the 2.0 XMS function codes.
;   These are 8 bit values which are loaded into
;   AH before calling the XMS handler (the address of which
;   was determined using XFuncXMSEntry int).
;
XMSGetVersion   equ     00h
XMSAllocHMA     equ     01h
XMSFreeHMA      equ     02h
XMSGlobEnabA20  equ     03h
XMSGlobDisabA20 equ     04h
XMSLocEnabA20   equ     05h
XMSLocDisabA20  equ     06h
XMSGetA20State  equ     07h
XMSGetFreeXM    equ     08h
XMSAllocXM      equ     09h
XMSFreeXM       equ     0ah
XMSMoveXM       equ     0bh
XMSLockXM       equ     0ch
XMSUnlockXM     equ     0dh
XMSGetHandInfo  equ     0eh
XMSResizeXM     equ     0fh
XMSAllocUM      equ     10h
XMSFreeUM       equ     11h


;
;   Now define the XMS error codes:
;
XMSErrOK        equ     00h     ; No error
XMSErrUnimp     equ     80h     ; Unimplemented function
XMSErrVDISK     equ     81h     ; VDISK device detected
XMSErrA20       equ     82h     ; A20 error
XMSErrNoHMA     equ     90h     ; HMA does not exist
XMSErrHMAInUse  equ     91h     ; HMA already in use
XMSErrHMAMin    equ     92h     ; HMA space req. < /HMAMIN= parameter
XMSErrHMANotAll equ     93h     ; HMA not allocated
XMSErrA20Enab   equ     94h     ; A20 still enabled
XMSErrNoXMLeft  equ     0A0h    ; All XM allocated
XMSErrNoHandles equ     0A1h    ; All handles are allocated
XMSErrHandInv   equ     0A2h    ; Invalid handle
XMSErrSHandInv  equ     0A3h    ; Invalid Source Handle
XMSErrSOffInv   equ     0A4h    ; Invalid Source Offset
XMSErrDHandInv  equ     0A5h    ; Invalid Dest Handle
XMSErrDOffInv   equ     0A6h    ; Invalid Dest Offset
XMSErrLenInv    equ     0A7h    ; Invalid Length
XMSErrOverlap   equ     0A8h    ; Invalid move overlap
XMSErrParity    equ     0A9h    ; Parity error
XMSErrNoLock    equ     0AAh    ; Handle not locked
XMSErrLock      equ     0ABh    ; Handle Locked
XMSErrLockOvflo equ     0ACh    ; Lock count overflo
XMSErrLockFail  equ     0ADh    ; Lock fail
XMSErrSmUMB     equ     0B0h    ; Smaller UMB available
XMSErrNoUMB     equ     0B1h    ; No UMB's available
XMSErrUMBInv    equ     0B2h    ; Invalid UMB segment


;
;   Define the Bios interrupt and function codes
;
XMSBios         equ     15h

;
;   Define the two function codes
;
XMSBiosXMMove   equ     87h     ; Move a block of XMS
XMSBiosXMSize   equ     88h     ; Get size of extended memory

;
;   Define the access byte
;
XMSBiosAccess   equ     93h     ; The "correct" access byte