Windows 95 VxD C Source Code for VANYDEVD

 

Listing 3

/// VANYDEVDc.c

// --------------------------------------------// Dynamically loadable VxD for ANYDEV board// --------------------------------------------#define WIN32_LEAN_AND_MEAN // Excludes un-needed parts of windows.h#include "windows.h"#include <e:\ddk95\inc32\vmm.h>#include <e:\ddk95\inc32\vwin32.h>#include <e:\ddk95\inc32\debug.h>#include "VANYDEVD.H"// -------------------------------------// Externs defined in assembly module // -------------------------------------// These defined in assembly for the VMM.INC or VPICD.INC file inclusionextern DWORD GET_BD_MEM(void);extern DWORD Virt_IRQ(void);extern DWORD Get_IRQ_Status(void);extern void UNVirt_IRQ(DWORD IRQhandle);extern void End_ISR(DWORD IRQhandle);extern void Physically_Mask_IRQ(DWORD IRQhandle);extern void Physically_UNMask_IRQ(DWORD IRQhandle);// ------------------------// PRAGMA for this DATA // ------------------------// Establish segment#pragma data_seg ( "_LDATA","_LCODE")// ------------------------------------// Data structures MUST be INITIALIZED// ------------------------------------ADEV ANYDEVX = {0}; // Main structure for ANYDEV -- shared by app // ------------------------// PRAGMAS for this CODE // ------------------------// Establish segment#pragma code_seg ( "_LTEXT", "_LCODE" )//No stack checking for routines in this module#pragma check_stack(off)// ----------------// Disable hardware// ----------------void Disable_AnyDev(void){	//This would likely be a port WRITE to DISABLE the board's interrupt	 		}// ----------------// Enable hardware// ----------------void Enable_AnyDev(void){	//This would likely be a port WRITE to ENABLE the board's interrupt	 		}// --------------------------// ISR Processing for ANYDEV// --------------------------void Process_ISR(void){	//This is where the user might SET FLAGS and indicators in the ANYDEVX structure	//in order to notify the application that data is available below 1MB	 		}// -----------------// ISR for ANYDEV// -----------------void _declspec(naked)ISR_ANYDEV(void){	// Save registers	_asm sti	_asm pushad	_asm pushfd	//Process the ISR 	Process_ISR();	//End ISR	_asm clc	End_ISR(ANYDEVX.IRQhandle);	//Set GOOD return code	_asm clc	//Restore saved registers	_asm popfd	_asm popad	_asm ret;}// -------------------// Virtualize the IRQ// -------------------DWORD CVirt_IRQ(void){	// If in use by an instance of this program, RETURN with BAD code	if (ANYDEVX.IRQcount)		return (BOGUSADDRESS);	// If in use by another program, RETURN with BAD code	ANYDEVX.IRQstatus = Get_IRQ_Status();	if (ANYDEVX.IRQstatus)		return (BOGUSADDRESS);	// If IRQ NOT in use this point is reached	// Set BAD return code	ANYDEVX.IRQhandle = BOGUSADDRESS;	// Disable ANYDEV hardware		Disable_AnyDev();	// Get global memory address below 1mb	ANYDEVX.Global_addr_1MB = GET_BD_MEM();	if (ANYDEVX.Global_addr_1MB != BOGUSADDRESS)		{		// Virtualize the IRQ		ANYDEVX.IRQhandle = Virt_IRQ();			if (ANYDEVX.IRQhandle != BOGUSADDRESS)			{			// unmask the IRQ, set OK flag & increment IRQ count	 		Physically_UNMask_IRQ(ANYDEVX.IRQhandle);	 		ANYDEVX.IRQflags |= IRQ_VIRT_OK;			++(ANYDEVX.IRQcount);			}		}	return(ANYDEVX.IRQhandle);}// ----------------------// UN Virtualize the IRQ// ----------------------void CUNVirt_IRQ(DWORD IRQhandle){ // if IRQ has been successfully virtualized if ((ANYDEVX.IRQhandle != 0) &&  (ANYDEVX.IRQhandle != BOGUSADDRESS)) 	{	// Physically mask the IRQ and UN virtualized it	Physically_Mask_IRQ(ANYDEVX.IRQhandle);	UNVirt_IRQ(ANYDEVX.IRQhandle);	}// Set UNvirtualized flags and indicatorsANYDEVX.IRQhandle = BOGUSADDRESS;ANYDEVX.IRQflags &= ~IRQ_VIRT_OK;	return;}// ---------------------------------------// Set Good Return code for DIOC requests// ---------------------------------------void _declspec(naked)GoodReturnDIOC(void){	// Clear eax and carry flag for GOOD return	_asm xor eax,eax	_asm clc	_asm ret;}// ---------------------------------------// Set Bad Return code for DIOC requests// ---------------------------------------void _declspec(naked) BadReturnDIOC(void){	// NOTE: 50 is a FCN NOT SUPPORTED code -- ok to use	// SET carry flag for BAD return	_asm mov eax,50	_asm stc	_asm ret;}// ------------------------------// Routine for ANYDEV Device UNINIT  // ------------------------------void CVANYDEVD_Device_UNInit(){// Disable ANYDEV, Unvirtualize IRQ, set GOOD return code	Disable_AnyDev();				CUNVirt_IRQ(ANYDEVX.IRQhandle);		GoodReturnDIOC();				return;}// ------------------------------// Routine for ANYDEV Device INIT  // ------------------------------void CVANYDEVD_Device_Init(){DWORD retcode;	// Try to virtualize the IRQ	retcode = CVirt_IRQ();	// Set GOOD or BAD return code based on success	if (retcode == BOGUSADDRESS)		BadReturnDIOC();	else	    GoodReturnDIOC();	return;}// --------------------------------// Routine for ANYDEV Device IO ctrl  // --------------------------------void CVANYDEVD_Device_IOctrl(PDIOCPARAMETERS ptr){DWORD *obuf1;	// Field the DEV IO requests from VMM	switch(ptr->dwIoControlCode)		{		case(VANYDEVD_INIT_ADEV_HARDWARE):			ANYDEVX.flags = 0;			//User likely to require other initialization here		break;		case(VANYDEVD_GRAB_ADDRESSES):			// Point to Output buffer			obuf1 = (DWORD *) ptr->lpvOutBuffer;			// Return GLOBAL 1MB addr, addr of data structure			// and return indicators of IRQ virtuaization request			*obuf1 = ANYDEVX.Global_addr_1MB;		  	*(obuf1+1) = (DWORD) &ANYDEVX;			*(obuf1+2) = (DWORD) ANYDEVX.IRQhandle;			*(obuf1+3) = (DWORD) ANYDEVX.IRQflags;			//User might want to return other/different values here		break;		case(VANYDEVD_ENABLE_ANYDEV_HDWR):			//Call routine to enable interrupt			Enable_AnyDev();		break;		case(VANYDEVD_DISABLE_ANYDEV_HWR):			//Call routine to disable interrupt			Disable_AnyDev();		break;		//The below DIOC_GETVERSION is a part of the dynamic load protocol		//It MUST return a GOOD code (all codes here use GoodReturnDIOC()		case(DIOC_GETVERSION):		case(DIOC_CLOSEHANDLE):		default:		break;		} 	GoodReturnDIOC();	return;}

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