What does GDTR mean in GENERAL
In computing, GDTR stands for Global Descriptor Table Register. It is a feature of the Intel x86 architecture that stores information about memory segments used by the processor during program execution. This register allows a programmer to specify which segment or group of memory should be used at any given time. The GDTR is part of the processor's robust memory protection mechanisms, as it ensures that only authorized programs and services are granted access to specific areas of memory.
GDTR meaning in General in Computing
GDTR mostly used in an acronym General in Category Computing that means Global Descriptor Table Register
Shorthand: GDTR,
Full Form: Global Descriptor Table Register
For more information of "Global Descriptor Table Register", see the section below.
What is GDTR?
A Global Descriptor Table (GDT) is an advanced type of descriptor table used in protected mode operating systems, such as IBM PC DOS 4 and modern versions of Microsoft Windows. It provides details about how different types of memory are to be handled by the processor. For example, when using a GDT, one can specify which areas of memory should be readable or executable and which ones should be inaccessible due to security reasons. To control this table from the operating system's point-of-view, an additional register known as the Global Descriptor Table Register (GDTR) was designed into the processor architecture for this purpose.
How does GDTR work?
The contents of the GDT are specified by loading data into the GDTR register before entering protected mode. When protected mode is enabled, all subsequent instructions will utilize this new GDT until a new one is loaded into place via another loading instruction. It should also be noted that instructions reading from or writing into a GDT must execute from within Ring 0 privilege level (the highest privilege level). By specifying what segments can access certain areas of memory via a GDT and then regulating access to these areas with correct privilege levels assigned by either hardware or software mechanisms, we have created something called “memory protection” in our system - meaning only those applications/services allowed by the administrator will have access to sensitive areas of main memory.
Essential Questions and Answers on Global Descriptor Table Register in "COMPUTING»GENERALCOMP"
In conclusion, GDTR stands for Global Descriptor Table Register and serves as an important tool for controlling how different types of memory are accessed on a computer. By allowing administrators to set privileges on certain areas through its GDTs and restricting high-privilege instructions with appropriate Ring levels, GDTR helps create powerful security measures that protect both user data and system code from being compromised by malicious entities or accidental errors.