What is a protected mode?

In computer terminology, the X86 -protected phrase mode, which offers greater security by enabling key software functions. When operating in a protected mode, which is also called protected virtual address mode, the computer operating system is imposed by an improved check -up inspection on the machine. This improved control protects the operating system by granting a system for a system to close dangerous processes and delegate processes to be carried out in a virtual memory space.

In operating systems that include the processing of protected mode, there are several key features that make the service useful. The primary feature is the use of privileges for software operations. In the protected mode settings, all software is given a circular value of 0, 1, 2, or 3. These circular values ​​indicate permissible permits for the program. Program with an annual value of 0 is a super-administer program that has an overall access permissions such as operationsYstém files. The Ring 3 program 3, the default value for the applications, has a very limited authorization, thus protecting the operating system from damage by dishonest programs.

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protected mode also offers to improve the use of program memory. The use of paging sources is the application effectively firewalled to its own operating memory. The paging source maintains individual virtual memory segments safe as the system limits access to these areas. With the ability to use part of the available space on the hard disk drive as a paging file, it is possible to use more memory applications than physically available.

Using protected mode, space available in page files and virtual memory is assigned to use. The processes can be removed from physical memory and placed in virtual memory files located on the hard disk. Restrictions on Application of these banks virtual memoryThey not only accelerate the central processor units (CPU) processing time, but also help security. This is because virtual memory sources are kept separated from all other system resources, creating a part that is specially reserved for the application.

Multitasking is another advantage offered by using the operation of protected mode. When this operating mode is connected, the system is capable of using the gateway permits, calls and segments of tasks to prefer certain operations and processes. This level of priority controls what percentage of the processor time is devoted to the function of a specific application or process. With this level of independent control, the protected mode operating system can safely turn off programs and applications without fear of falling the whole system.