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Win95/98/NT 下对内存、端口、中断的直接控制和读写

王朝vc·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

TVicHw32.DLL version 2.0

Copyright (C) 1997 Victor Ishikeev

e-mail: victor@ivi.ugatu.ac.ru

Portions Copyright (C) 1997 EnTech Taiwan

e-mail: tools@entechtaiwan.com

AS_DLL.TXT

CONTENTS

========

1. GENERAL TVicHW32 FUNCTIONS

2. DIRECT MEMORY ACCESS WITH TVicHW32

3. DIRECT PORT I/O WITH TVicHW32

4. HARDWARE INTERRUPT HANDLING WITH TVicHW32

5. CONTACT INFORMATION

1. GENERAL TVicHW32 FUNCTIONS

====================================================

TVicHW32 has the following general functions:

bool VICFN OpenTVicHW32(void);

-------------------------------

Loads the vichwXX.vxd (under Windows 95) or vichwXX.sys (under

Windows NT) kernel-mode driver, providing direct access to the

hardware. If the kernel-mode driver was successfully opened, the

IsDriverOpened() returns True; if the function fails, the IsDriverOpened()

returns False.

void VICFN CloseTVicHW32(void);

----------------------

Closes the kernel-mode driver and releases memory allocated to it.

If a hardware interrupt was "unmasked", the "mask" is restored. If the

driver was successfully closed, the IsDriverOpened() always returns False.

bool VICFN IsDriverOpened (void);

----------------------------------------------

This boolean function specifies whether the kernel-mode driver is open.

Returns True if the driver is already open, or False if it is not.

2. DIRECT MEMORY ACCESS WITH TVicHW32

=====================================

The following function permits direct memory acccess:

void* VICFN MapPhysToLinear(DWORD PhAddr, DWORD Size);

---------------------------------------- ----------------------

Maps a specific physical address to a pointer in linear memory,

where PhAddr is the base address and Size is the actual number of

bytes to which access is required.

Note that a subsequent call to MapPhysToLinear invalidates the

previous pointer.

The following example returns a pointer to the system ROM BIOS area:

char *pBios;

OpenVicHW32();

if (IsDriverOpened()) {

pBios = MapPhysToLinear (0xF8000,256); file://255 bytes beginning at $F8000

file://...working with pBIOS...

CloseVicHW32();

}

else ... // failed

3. DIRECT PORT I/O WITH TVicHW32

================================

The following functions permit direct I/O port access:

------------------------------------------------------

BYTE VICFN ReadPort (WORD wPortAddress); // read one byte

WORD VICFN ReadPortW (WORD wPortAddress); // read one word

DWORD VICFN ReadPortL (WORD wPortAddress); // read four bytes

void VICFN WritePort (WORD wPortAddress, BYTE bData); // write one byte

void VICFN WritePortW (WORD wPortAddress, WORD wData); // write one word

void VICFN WritePortL (WORD wPortAddress, DWORD lData); // write four bytes

void VICFN SetHardAccess(bool HardAccess);

-------------------------------------------

The SetHardAccess() function determines whether the kernel-mode driver

should use "hard" or "soft" access to the I/O ports. If set to True

"hard" access is employed; if set to False "soft" access is employed.

"Soft" access provides higher performance access to ports, but may fail

if the port(s) addressed are already in use by another kernel-mode

driver. While slower, "Hard" access provides more reliable access to

ports which have already been opened by another kernel-mode driver.

bool VICFN TestHardAccess(void);

---------------------------------

Returns True is "hard" access is used.

4. HARDWARE INTERRUPT HANDLING WITH TVicHW32

============================================

In a Win32 environment, hardware interrupts are normally prohibited

by Windows; the TVicHW32 kernel-mode driver allows you to use the

interrupt for direct handling by your application. Note that only one

interrupt can be handled at a time.

The following functions permit access to hardware interrupts.

void VICFN SetIRQ(BYTE IRQNumber, void * lpfnOnHwInterrupt);

-------------------------------------------------------------

Assign the interrupt specified by the IRQNumber value (1..15) to

the lpfnOnHwInterrrupt() handler. If success then IsIRQSet() function

(see below) returns True.

Note that IRQ0 (the system timer) is *not* supported.

bool VICFN IsIRQSet(void);

----------------------------------------

Specifies whether the hardware interrupt handler has been

created by the SetIRQ method.

void VICFN UnMaskIRQ(void);

----------------------------

Physically unmasks the hardware interrupt specified by the IRQNumber

property, so that an lpfnOnHWInterrupt function will be generated

when a hardware interrupt occurs.

void VICFN MaskIRQ(void);

--------------------------

Physically masks the hardware interrupt specified by the IRQNumber value.

bool VICFN IsMasked(void);

---------------------------

Function which specifies whether the hardware interrupt

handler has been physically masked (True).

void VICFN DestroyIRQ(void);

-----------------------------

Frees the memory and code previously assigned for the hardware

interrupt specified by the IRQNumber value.

DWORD VICFN GetInterruptCounter(void);

--------------------------------------

Function which counts the number of hardware interrupts

intercepted by the TVicHW32 kernel-mode driver. The GetInterruptCounter()

function is provided largely for debugging purposes, allowing you to

compare the actual number of hardware interrupts generated with the

number processed by your application.

void VICFN SimulateHWInt(void);

-------------------------------

This function is provided for purposes of debugging, and allows you to

simulate a hardware interrupt. When this procedure is called, the TVicHW32

kernel-mode driver will feign a "hardware interrupt", without directly

affecting the hardware.

5. CONTACT INFORMATION

======================

Comments, questions and suggestions regarding TVicHW32 can be directed

by e-mail to victor@ivi.ugatu.ac.ru or tools@entechtaiwan.com.

With best wishes,

Victor Ishikeev

Jun 1997

 
 
 
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