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Old Unix and Linux 10-03-2012   -   Original Discussion by Neo
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The system call interface layer could mislead the uninitiated into believing that system calls exist outside/above the kernel. If that were my "onion", I would delete the system call layer and enlarge the kernel, subdividing it into two layers (perhaps with a bit of shading): 1) drivers, adjacent to the hardware, and 2) system calls adjacent to userland.

EDIT: Put differently, I'd relabel "kernel" as "drivers" and indicate that "kernel = system call interface + drivers".

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Alister