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;******************************************************************************
TITLE VNMID -
;******************************************************************************
;
; (C) Copyright MICROSOFT Corp., 1990
;
; Title: VNMID.ASM -
;
; Version: 3.00
;
; Date: 8-Oct-1990
;
; Author: Neil Sandlin
;
;
;------------------------------------------------------------------------------
;
; Change log:
;
; DATE REV DESCRIPTION
; ----------- --- -----------------------------------------------------------
;
;==============================================================================
.386p
;******************************************************************************
; I N C L U D E S
;******************************************************************************
.XLIST
INCLUDE VMM.Inc
INCLUDE Debug.Inc
.LIST
;******************************************************************************
; V I R T U A L D E V I C E D E C L A R A T I O N
;******************************************************************************
Declare_Virtual_Device VNMID, 3, 0, VNMID_Control, Undefined_Device_ID ,,,
;******************************************************************************
; L O C A L D A T A
;******************************************************************************
VxD_LOCKED_DATA_SEG
NMI_Chain dd ?
VxD_LOCKED_DATA_ENDS
;******************************************************************************
; I N I T I A L I Z A T I O N C O D E
;******************************************************************************
VxD_ICODE_SEG
;******************************************************************************
;
; VNMID_Device_Init
;
; DESCRIPTION:
; This routine installs the NMI handler.
;
;
;==============================================================================
BeginProc VNMID_Device_Init
IFDEF DEBUG
Trace_Out "VNMID installed."
ENDIF
VMMcall Get_NMI_Handler_Addr ; get current handler
mov [NMI_Chain], esi
mov esi, OFFSET32 VNMID_Handler ; setup up our NMI handler
VMMcall Set_NMI_Handler_Addr
mov esi, OFFSET32 VNMID_Event_Handler ; setup our event handler
VMMcall Hook_NMI_Event
clc
ret
EndProc VNMID_Device_Init
VxD_ICODE_ENDS
;******************************************************************************
VxD_LOCKED_CODE_SEG
;******************************************************************************
;
; VNMID_Control
;
; DESCRIPTION:
;
; This is a call-back routine to handle the messages that are sent
; to VxD's to control system operation.
;
;
;==============================================================================
BeginProc VNMID_Control
Control_Dispatch Device_Init, VNMID_Device_Init
clc
ret
EndProc VNMID_Control
;******************************************************************************
;
; VNMID_Handler
;
; DESCRIPTION:
;
; This handler is called at NMI time, so what can be done here is
; limited. The following comes from the "Virtual Device Adaptation Guide":
;
; Notice that you NMI interrupt handler can only touch local data in the
; device's VxD_LOCKED_DATA_SEG. It cannot touch memory in a VM handle,
; V86 memory, or any other memory. It also cannot call ANY services,
; INCLUDING services that can be called during normal hardware interrupts.
; Because an NMI can occur at any time, it is difficult to do much of
; anything during interrupt time that is guaranteed not to reenter a
; non-reentrant procedure or affect a data structure.
;
;
;******************************************************************************
BeginProc VNMID_Handler
; Code inserted here would be executed in the event of an NMI
jmp [NMI_Chain] ; chain to next
EndProc VNMID_Handler
VxD_LOCKED_CODE_ENDS
VxD_CODE_SEG
;******************************************************************************
;
; VNMID_Event_Handler
;
; DESCRIPTION:
;
; This event handler is called sometime after the interrupt handler
; was called, when VMM has had a chance to get everything in order.
; Here, services can be called as required.
;
; ENTRY:
;
;
;******************************************************************************
BeginProc VNMID_Event_Handler
IFDEF DEBUG
Trace_Out "VNMID: Event received"
ENDIF
clc
ret
EndProc VNMID_Event_Handler
VxD_CODE_ENDS
END
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