Question

Explain protection mechanism of 80386.

Answer 1

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The 80386 provides four protection levels for supporting a multitasking operating system to isolate and protect user programs from each other and the operating system. The privilege level controls the use of privileged instructions, I/O instructions, and access to segments and segment descriptors.

Answer 2

The 80386 microprocessor is a 32-bit processor that can do 32-bit operations in a single cycle. It has a 32-bit data bus and a 32-bit address bus. As a result, it can access 4 GB (or 232) of physical memory.

Protection mechanism of 80386 microprocessor

The 80386 microprocessor's two most important features are multitasking and security. Internal dedicated hardware in the 80386 allows for multitasking.

There are five aspects to protection in the 80386:

1. Type checking
2. Limit checking
3. Restriction of addressable domain
4. Restriction of procedure entry points
5. Restriction of instruction set

The memory management hardware of the 80386 includes the memory protection circuitry. The term "protection" refers to both segment and page translation.

The hardware examines each memory reference to ensure that it meets the protection standards. All of these checks are performed before the memory cycle begins; any violation prevents the cycle from beginning and causes an exception. There is no performance penalty because the checks are conducted concurrently with address generation.

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