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Privileged modes

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The four privileged modes (Ring 0 to Ring 3 as provided by x86) are the minimum levels of execution modes required for an operating system to operate correctly
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harsh yadav asked Dec 4, 2018
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#Privileged vs Non Privileged mode
A CPU has 2 modes, privileged and non-privileged. In order to change the mode from non-privileged to privileged normally software interrupt is used but can a hardware interrupt can change the mode from non-privileged to privileged?
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cse7 asked Oct 22, 2016
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does operating system always runs in privileged mode
does operating system always runs in privileged mode or is there any other way also?
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resilientknight asked Sep 1, 2016
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OS - Privileged,non-privileged concept,typical/crucial
can a non privileged instruction be executed in privileged mode?(like when returning from kernel to user mode) or is it necessary to make it a privileged instruction?
can a non privileged instruction be executed in privileged mode?(like when returning from kernel to user mode) or is it necessary to make it a privileged instruction?
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