Computer Science / Unit 6 CS 0297 short lesson, about 20 seconds
Kernel Mode and the System Call
Captions available
The idea
A system call is a request from user mode asking kernel mode to perform an action — crossing an isolation boundary that protects the kernel and programs from each other.
In practice
A records app never opens the disk itself; a request crosses the line.
Where people slip
The boundary protects; the call is the door.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
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