Propose Method to Access Protected Mode of Windows Operating System

F. Aziz, Enas

doi:10.32894/kujss.2011.43111

	Propose Method to Access Protected Mode of Windows Operating System
Kirkuk Journal of Science
Article 1, Volume 6, Issue 2, 2011, Pages 43-49 PDF (0 K)
DOI: 10.32894/kujss.2011.43111
Author
Enas F. Aziz
Abstract
Current day computer systems allow multiple programs to be loaded into memory and to be executed concurrently. This evolution required protection among those various programs. To ensure this protection, operating systems provide protected mode that contains descriptor tables that in its turn, control access to memory segment. In the Intel Architecture, and more precisely in protected mode, most of the memory management and Interrupt Service Routines are controlled through tables of descriptors. Each descriptor stores information about a single object (e.g. a service routine, a task, a chunk of code or data, whatever) the CPU might need at some time. In this research, these tables with their contents are studied and given a method to know the contents of these tables and to study the behavior of the O.S, In other words, access to the protected status and work with printing the contents of some special registers that cannot be accessible only within the protected mode (Ring 0). The program in this research is written in Assembly language (MASM version 7) and tested under Windows Me. The program executed with 32-bit microprocessor, because it contains instruction that can deal with the special registers (GDTR & LDTR) that contains addresses of descriptor tables.
Keywords
Propose; method; access; Protected; Mode of Windows; Operating; System

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