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PAGE ,132
TITLE DXOEM.ASM -- Dos Extender OEM Interface
; Copyright (c) Microsoft Corporation 1988-1991. All Rights Reserved.
;***********************************************************************
;
; DXOEM.ASM - DOS Extender OEM Interface
;
;-----------------------------------------------------------------------
;
; This module contains the routines that may need to be modified by OEMs
; when adding new device/interface support to the Microsoft 286 DOS
; Extender portion of Windows/286. There are four routines contained
; in this module:
;
; InitializeOEM - called during DOSX initialization
;
; SuspendOEM - called when the protected mode app is about
; to be suspended (currently when running a
; standard DOS 'old' app from Windows).
;
; ResumeOEM - called when the protected mode app is about
; to be resumed (currently when returning from
; a standard DOS 'old' app to Windows).
;
; TerminateOEM - called during DOSX termination
;
; Note: when this module refers to the 'OEM layer,' it is refering to
; the 286 DOS Extender device drivers, API mappers, etc., not the
; Windows OEM layer.
;
;-----------------------------------------------------------------------
;
; 06/28/89 jimmat Original version.
; 11/29/90 amitc Removed SuspendOEM/ResumeOEM - not required for 3.1
; 11/29/90 amitc Moved call to 'InitLowHeap' from here to DXNETBIO.ASM
;
;***********************************************************************
.286p
; -------------------------------------------------------
; INCLUDE FILE DEFINITIONS
; -------------------------------------------------------
.xlist
.sall
include segdefs.inc
include gendefs.inc
include pmdefs.inc
.list
; -------------------------------------------------------
; GENERAL SYMBOL DEFINITIONS
; -------------------------------------------------------
; -------------------------------------------------------
; EXTERNAL SYMBOL DEFINITIONS
; -------------------------------------------------------
extrn InitNetMapper:NEAR
extrn TermNetMapper:NEAR
extrn ReleaseLowHeap:NEAR
; -------------------------------------------------------
; DATA SEGMENT DEFINITIONS
; -------------------------------------------------------
DXDATA segment
extrn NetHeapSize:WORD
DXDATA ends
; -------------------------------------------------------
; CODE SEGMENT VARIABLES
; -------------------------------------------------------
DXCODE segment
DXCODE ends
DXPMCODE segment
DXPMCODE ends
; -------------------------------------------------------
subttl OEM Initialization Routine
page
; -------------------------------------------------------
; OEM INITIALIZATION ROUTINE
; -------------------------------------------------------
DXPMCODE segment
assume cs:DXPMCODE
;--------------------------------------------------------
; InitializeOEM -- This routine is called during DOSX initialization
; in order to initialize the OEM layer (device drivers, API
; mappers, etc.). It expectes to be called late enough in the
; initialization process that other interrupt mapping functions
; (like Int 21h) are available.
;
; This routine is called in protected mode, and can enable/disable
; interrupts if it so requires.
;
; Input: none
; Output: none
; Errors: none
; Uses: ax, all others preserved
assume ds:DGROUP,es:NOTHING,ss:NOTHING
public InitializeOEM
InitializeOEM proc near
; Initialize the NetBios mapper.
mov ax,NetHeapSize ;don't initialize if net heap
or ax,ax ; size set to zero
jz @f
call InitNetMapper ;initialize the NetBIOS mapper--CY set
; if NetBIOS not installed
@@:
ret
InitializeOEM endp
; -------------------------------------------------------
DXPMCODE ends
; -------------------------------------------------------
subttl OEM Termination Routine
page
; -------------------------------------------------------
; OEM TERMINATION ROUTINE
; -------------------------------------------------------
DXCODE segment
assume cs:DXCODE
; -------------------------------------------------------
; TerminateOEM -- This routine is called during DOSX termination
; to disable the OEM layer.
;
; Note: This routine must is called in REAL MODE! If some termination
; code must run in protected mode, the routine must switch to
; protected mode itself, and switch back to real mode before
; returning.
;
; Input: none
; Output: none
; Errors: none
; Uses: ax,bx,cx,dx,si,di,es
;
assume ds:DGROUP,es:NOTHING,ss:NOTHING
public TerminateOEM
TerminateOEM proc near
call TermNetMapper ;terminate the NetBIOS mapper
call ReleaseLowHeap ; and release the low net heap
ret
TerminateOEM endp
; -------------------------------------------------------
DXCODE ends
;****************************************************************
end
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