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Physical Memory Access Driver for MS Windows 9x/Me

 
   

Objectives

While running the SMBIOS Inventory Tool, it turned out that the inventory process failed on some notebook models because some SMBIOS data was not accessible. In particular, this happened on Toshiba and FUJITSU laptops. During the inventory process it was necessary to read the memory by physical adresses.

The SMBIOS Inventory Tool is a Win16 application, so it was able to address the memory directly in the 0-16 Mb range, and the problem machines had the necessary data located out of that range. The project was aimed at providing access to the SMBIOS data located above the 0-16 Mb range of memory under MS Windows 9x/Me.
 

Results

As a result of this project we implemented the mechanism allowing SMBIOS Inventory Tool to read the memory by physical addresses while running under MS Windows 9x/Me. The use of this mechanism fixed the inventory problem of the SMBIOS data located above the 0-16 Mb memory range.

Technical peculiarities

To work with physical memory under MS Windows 9x/Me, we chose the standard way - to design a VXD driver able to run on Ring-0 and address physical memory. The driver provides the functionality of copying a portion of physical memory into the specified buffer.