528 lines
14 KiB
NASM
528 lines
14 KiB
NASM
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;****************************************************************************
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; *
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; THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY *
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; KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE *
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; IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR *
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; PURPOSE. *
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; *
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; Copyright (C) 1993-95 Microsoft Corporation. All Rights Reserved. *
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; *
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;****************************************************************************
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PAGE 58,132
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;******************************************************************************
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TITLE GENERIC - Generic VxD
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;******************************************************************************
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;
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; Title: GENERIC.ASM - Generic VxD
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;
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; Version: 1.00
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;
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;==============================================================================
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.386p
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;******************************************************************************
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; I N C L U D E S
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;******************************************************************************
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DDK_VERSION EQU 400H
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.XLIST
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INCLUDE VMM.Inc
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INCLUDE Debug.Inc
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.LIST
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;******************************************************************************
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; V I R T U A L D E V I C E D E C L A R A T I O N
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;------------------------------------------------------------------------------
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; The VxD declaration statement defines the VxD name, version number,
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; control proc entry point, VxD ID, initialization order, and VM API
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; entry points. What follows is a minimal VxD declaration, defining
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; only the name, version, control proc, and an undefined ID. Depending
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; on the requirements of the VxD, the following may be added:
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;
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; - Defined VxD ID: See VXDID.TXT for more information
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; - Init order: If your Vxd MUST load before or after a specific VxD,
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; the init order can be defined. See VMM.INC for the
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; definition of the init order of the standard devices.
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; - V86,PM API: You may wish to allow application or library code running
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; in a virtual machine to communicate with your VxD directly.
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; See the chapter entitled "VxD APIs (Call-Ins)" in the
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; Virtual Device Adaptation Guide.
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;
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;******************************************************************************
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Declare_Virtual_Device PCMVXD, 1, 0, VXD_Control, 77h, \
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Undefined_Init_Order,GENERIC_PM_API,GENERIC_PM_API
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;******************************************************************************
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; D A T A
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;******************************************************************************
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VxD_IDATA_SEG
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; Initialization data here - discarded after Init_Complete
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VxD_IDATA_ENDS
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VxD_DATA_SEG
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; Normal Data here
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PM_API_Table label DWORD
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dd OFFSET32 PM_GetVersion
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dd OFFSET32 PM_OpenPin
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dd OFFSET32 PM_ClosePin
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dd OFFSET32 PM_Write
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CallbackSeg dw 0
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CallbackOff dw 0
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CallbackRef dd 0
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EXTRN _OpenPin:near
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EXTRN _ClosePin:near
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EXTRN _WritePin:near
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VxD_DATA_ENDS
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write_context STRUC
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WH_Data DD ?
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WH_BufferLength DD ?
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WH_BytesRecorded DD ?
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WH_User DD ?
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WH_Flags DD ?
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WH_Loops DD ?
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WH_Next DD ?
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WH_reserved DD ?
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WC_ClientContext DD ?
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WC_CallbackOffset DW ?
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WC_CallbackSegment DW ?
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WC_ClientThread DD ?
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WC_Reserved DD ?
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write_context ENDS
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VxD_LOCKED_DATA_SEG
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; Pagelocked data here - try to keep this to a minimum.
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VxD_LOCKED_DATA_ENDS
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;******************************************************************************
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; I N I T I A L I Z A T I O N C O D E
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;------------------------------------------------------------------------------
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; Code in the initialization segment is discarded after Init_Complete
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;******************************************************************************
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VxD_ICODE_SEG
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;******************************************************************************
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;
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; VXD_Device_Init
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;
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; DESCRIPTION:
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; This is a shell for a routine that is called at system BOOT.
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; Typically, a VxD would do its initialization in this routine.
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;
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; ENTRY:
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; EBX = System VM handle
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;
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; EXIT:
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; Carry clear to indicate load success
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; Carry set to abort loading this VxD
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;
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; USES:
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; flags
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;
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;==============================================================================
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BeginProc VXD_Device_Init
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clc ;no error - load VxD
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ret
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EndProc VXD_Device_Init
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VxD_ICODE_ENDS
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;******************************************************************************
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; C O D E
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;------------------------------------------------------------------------------
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; The 'body' of the VxD would typically be in the standard code segment.
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;******************************************************************************
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VxD_CODE_SEG
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;******************************************************************************
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;
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; VXD_Create_VM
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;
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; DESCRIPTION:
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; This is a shell for a routine that is called when a virtual
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; machine is created. A typical VxD might perform some action
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; here to prepare for handling the new VM in the system.
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;
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; ENTRY:
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; EBX = VM handle
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;
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; EXIT:
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; Carry clear to continue creating VM
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; Carry set to abort the creation of the VM
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;
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; USES:
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; flags
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;
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;==============================================================================
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BeginProc VXD_Create_VM
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clc ;no error - continue
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ret
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EndProc VXD_Create_VM
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc GENERIC_PM_API,PUBLIC
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movzx eax,[ebp.Client_AX] ; get function code
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cmp eax,PM_Write
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ja VPA_Failed
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jmp dword ptr PM_API_Table[eax*4]
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VPA_Failed:
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mov [ebp.Client_AX],0
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ret
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EndProc GENERIC_PM_API
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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;
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc PM_GetVersion,PUBLIC
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int 3
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ret
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EndProc PM_GetVersion
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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;
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc PM_OpenPin,CCALL,PUBLIC
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cCall _OpenPin
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ret
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EndProc PM_OpenPin
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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;
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc PM_ClosePin,PUBLIC
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cCall _ClosePin
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ret
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EndProc PM_ClosePin
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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;
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc PM_Write,PUBLIC
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; DS:SI is ptr to WaveHdr
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; ES:DI is callback for completion (do callback with DS:SI as context)
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; Allocate space to store our write context
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VMMcall _HeapAllocate, <(SIZE write_context), 0>
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or eax, eax ; zero if error
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jz error
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; Remember our write context pointer (we pop it three times below)
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push eax
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push eax
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push eax
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; Store a pointer to the callback routine
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mov cx, [ebp.Client_ES]
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mov [eax.WC_CallbackSegment],cx
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mov cx, [ebp.Client_DI]
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mov [eax.WC_CallbackOffset],cx
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; Store the client's context (for use during callback)
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mov cx, [ebp.Client_DS]
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mov WORD PTR [eax.WC_ClientContext + 2],cx
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mov cx, [ebp.Client_SI]
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mov WORD PTR [eax.WC_ClientContext],cx
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VMMCall Get_Cur_Thread_Handle ; returned in edi
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mov [eax.WC_ClientThread], edi
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; Convert the WaveHdr pointer to a flat address
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Client_Ptr_Flat esi, DS, SI
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; Copy the WaveHdr structure from the client to our WaveHdr
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mov ecx, 32
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pop edi
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cld
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rep movsb
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; Get the current VM (returned in EBX)
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VMMcall Get_Cur_VM_Handle
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; Map the Wave data selector to its flat base address
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pop eax
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movzx ecx, WORD PTR [eax + 2]
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VMMcall _SelectorMapFlat, <ebx, ecx, 0>
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pop ecx ; get back write context ptr
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cmp eax, 0FFFFFFFFh ; 0FFFFFFFFh if error
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je error
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; Munge the user-mode address of our data
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movzx ebx, WORD PTR [ecx.WH_Data]
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add eax, ebx
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mov [ecx.WH_Data], eax
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mov eax, OFFSET32 PM_Callback
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cCall _WritePin, <ecx, eax, ecx>
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error:
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ret
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EndProc PM_Write
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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;
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc PM_ScheduledCallback,PUBLIC
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; ebx VMHandle
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; edi ThreadHandle
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; edx RefData
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; ebp OFFSET32 Client_Reg_Struc
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push edx
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Push_Client_State ; does VMMCall Save_Client_State
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VMMCall Begin_Nest_Exec ; or Begin_Nest_V86_Exec
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; edx holds our write context
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mov ax, WORD PTR [edx.WC_ClientContext]
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mov [ebp.Client_SI], ax
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mov ax, WORD PTR [edx.WC_ClientContext + 2]
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mov [ebp.Client_DS], ax
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mov eax, edx
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mov cx, [eax.WC_CallbackSegment]
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movzx edx, [eax.WC_CallbackOffset]
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VMMCall Simulate_Far_Call ; set up CX:EDX as CS:EIP to call
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VMMCall Resume_Exec ; do it!
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VMMCall End_Nest_Exec
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Pop_Client_State ; does VMMCall Restore_Client_State
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pop edx
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VMMcall _HeapFree, <edx, 0>
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ret
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EndProc PM_ScheduledCallback
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;******************************************************************************
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;
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;
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; Description:
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;
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; Entry:
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;
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; Exit:
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; Uses:
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;==============================================================================
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BeginProc PM_Callback,CCALL,PUBLIC
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ArgVar DevObject,DWORD
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ArgVar pIrp,DWORD
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ArgVar Context,DWORD
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EnterProc
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SaveReg <esi, edi>
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mov eax, Context
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mov ebx, [eax.WC_ClientThread]
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mov ecx, (PEF_Thread_Event)
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; OR PEF_Wait_Not_Nested_Exec)
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mov edx, Context
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mov esi, OFFSET32 PM_ScheduledCallback
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mov edi, 0
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mov eax, 0 ; no priority boost
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VMMcall Call_Restricted_Event
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RestoreReg <edi, esi>
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LeaveProc
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xor eax, eax
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ret 12
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EndProc PM_Callback
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VxD_CODE_ENDS
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;******************************************************************************
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; P A G E L O C K E D C O D E
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;------------------------------------------------------------------------------
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; Memory is a scarce resource. Use this only where necessary.
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;******************************************************************************
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VxD_LOCKED_CODE_SEG
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;******************************************************************************
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;
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; VXD_Control
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|
;
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|
|
; DESCRIPTION:
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||
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|
;
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|
|
; This is a call-back routine to handle the messages that are sent
|
||
|
|
; to VxD's to control system operation. Every VxD needs this function
|
||
|
|
; regardless if messages are processed or not. The control proc must
|
||
|
|
; be in the LOCKED code segment.
|
||
|
|
;
|
||
|
|
; The Control_Dispatch macro used in this procedure simplifies
|
||
|
|
; the handling of messages. To handle a particular message, add
|
||
|
|
; a Control_Dispatch statement with the message name, followed
|
||
|
|
; by the procedure that should handle the message.
|
||
|
|
;
|
||
|
|
; The two messages handled in this sample control proc, Device_Init
|
||
|
|
; and Create_VM, are done only to illustrate how messages are
|
||
|
|
; typically handled by a VxD. A VxD is not required to handle any
|
||
|
|
; messages.
|
||
|
|
;
|
||
|
|
; ENTRY:
|
||
|
|
; EAX = Message number
|
||
|
|
; EBX = VM Handle
|
||
|
|
;
|
||
|
|
;==============================================================================
|
||
|
|
|
||
|
|
BeginProc VXD_Control
|
||
|
|
|
||
|
|
Control_Dispatch Device_Init, VXD_Device_Init
|
||
|
|
Control_Dispatch Create_VM, VXD_Create_VM
|
||
|
|
clc
|
||
|
|
ret
|
||
|
|
|
||
|
|
EndProc VXD_Control
|
||
|
|
|
||
|
|
VxD_LOCKED_CODE_ENDS
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;******************************************************************************
|
||
|
|
; R E A L M O D E C O D E
|
||
|
|
;******************************************************************************
|
||
|
|
|
||
|
|
;******************************************************************************
|
||
|
|
;
|
||
|
|
; Real mode initialization code
|
||
|
|
;
|
||
|
|
; DESCRIPTION:
|
||
|
|
; This code is called when the system is still in real mode, and
|
||
|
|
; the VxDs are being loaded.
|
||
|
|
;
|
||
|
|
; This routine as coded shows how a VxD (with a defined VxD ID)
|
||
|
|
; could check to see if it was being loaded twice, and abort the
|
||
|
|
; second without an error message. Note that this would require
|
||
|
|
; that the VxD have an ID other than Undefined_Device_ID. See
|
||
|
|
; the file VXDID.TXT more details.
|
||
|
|
;
|
||
|
|
; ENTRY:
|
||
|
|
; AX = VMM Version
|
||
|
|
; BX = Flags
|
||
|
|
; Bit 0: duplicate device ID already loaded
|
||
|
|
; Bit 1: duplicate ID was from the INT 2F device list
|
||
|
|
; Bit 2: this device is from the INT 2F device list
|
||
|
|
; EDX = Reference data from INT 2F response, or 0
|
||
|
|
; SI = Environment segment, passed from MS-DOS
|
||
|
|
;
|
||
|
|
; EXIT:
|
||
|
|
; BX = ptr to list of pages to exclude (0, if none)
|
||
|
|
; SI = ptr to list of instance data items (0, if none)
|
||
|
|
; EDX = DWORD of reference data to be passed to protect mode init
|
||
|
|
;
|
||
|
|
;==============================================================================
|
||
|
|
|
||
|
|
VxD_REAL_INIT_SEG
|
||
|
|
|
||
|
|
BeginProc VxD_Real_Init_Proc
|
||
|
|
|
||
|
|
test bx, Duplicate_Device_ID ; check for already loaded
|
||
|
|
jnz short duplicate ; jump if so
|
||
|
|
|
||
|
|
xor bx, bx ; no exclusion table
|
||
|
|
xor si, si ; no instance data table
|
||
|
|
xor edx, edx ; no reference data
|
||
|
|
|
||
|
|
mov ax, Device_Load_Ok
|
||
|
|
ret
|
||
|
|
|
||
|
|
duplicate:
|
||
|
|
mov ax, Abort_Device_Load + No_Fail_Message
|
||
|
|
ret
|
||
|
|
|
||
|
|
EndProc VxD_Real_Init_Proc
|
||
|
|
|
||
|
|
|
||
|
|
VxD_REAL_INIT_ENDS
|
||
|
|
|
||
|
|
|
||
|
|
END
|
||
|
|
|