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i have a line in my notes--------  IN Order to switch from User mode to Kernel mode during execution . we just have to change  one Bit at hardware level..   I am not remembering concept plzz help
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The idea is very simple. To distinguish between the mode system is currently running in we provide a mode bit.

When the value of mode bit is 0 it is in kernel mode. And when it is 1, the system is said to run in user mode.

Reference-

Galvin, Chapter 1, page no-22, 9th Edition.

I hope it helps.

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