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The OS communicates with the CPU via the "kernel" - which is actually a core part of the OS.

When an operating system is loaded into memory, the kernel loads first and remains in memory until the operating system is shut down again. It should load into a protected portion of memory that cannot be written to by any other process. A computer kernel interfaces between the three major computer hardware components, providing services between:

  • the application/user interface
  • the CPU, memory
  • other hardware I/O devices
The rest of the OS makes calls to the kernel, which then interacts with the CPU (or other hardware). If properly implemented, this enforces the principle of "least privilege" - one of the fundamental tenets of computer security.
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