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Does there exist a (micro-)kernel of an operating system that is fully implemented in hardware? That is, a kernel that is not stored in RAM, and loaded into CPU registers after an interrupt or system call, but is instead a fully hardcoded part of the CPU itself, so that a system call/interrupt never leads to a context switch?

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The key search terms here are FPGA and ASIC, since at this point the OS is no longer running on instructions executed by a CPU in the conventional sense.

Here is a relevant result I found with a quick Google search on microkernel fpga and os kernel fpga:

Susanna Nordström et al. Application Specific Real-Time Microkernel in Hardware.

In the RTU, the scheduling, inter process communication, interrupt management, resource management, synchronization and time management control are implemented in hardware (using VHDL).

This paper goes a step further and describes an OS-like environment for FPGA programs themselves: Kermin Fleming et al. The LEAP FPGA Operating System.

Like a software operating environment, LEAP provides both basic device abstractions for FPGAs and a collection of standard I/O and memory management services.

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