Chapter 39 Flashcards
1
Q
8088 processor have how many bits
A
16 and 32
2
Q
What is protected mode
A
Switching of processor from 16 bit to 32 bit
3
Q
How protected mode works
A
Turn on the least significant bit of a new register called CR0 (Control Register 0) and the processor switches into 32bit mode
4
Q
Can operating system define the possible descriptors for a program
A
Yes
5
Q
What is role of descriptor
A
Descriptor describes the base, limit, and attributes of a segment
6
Q
What is selector
A
Selector selects descriptors from the table
7
Q
What is privilege level of the program
A
The ability of a program to select descriptor from tables selected by OS
8
Q
What is GDT
A
Global Descriptor Table is a table of descriptors set by OS
