Operating Systems In Progress

APEX-OS

Custom operating system development requiring kernel design, driver architecture, security model, and performance optimization. FDRP provides progressive disclosure of OS layers with expert expansion from kernel through userspace.

The Problem

Operating system design is a layered engineering challenge where decisions at each layer constrain all layers above it:

Kernel architecture (monolithic vs. microkernel vs. hybrid) determines the security boundary model
Memory management design affects every driver, service, and userspace application
Scheduler policy trades off latency, throughput, and fairness in ways specific to the target workload
Driver model (in-kernel vs. user-mode) affects both performance and fault isolation
Security model must be designed into the kernel, not added retroactively

The challenge for AI-assisted design: each layer requires specialists who understand not just their own layer but how their decisions propagate upward. A kernel memory management expert who does not understand userspace allocation patterns will make locally optimal but globally poor decisions.

FDRP Application

Progressive Layer Disclosure

FDRP's progressive disclosure maps directly to OS architecture layers. Each layer is reviewed by specialists before the next layer begins, ensuring foundational decisions are stable before dependent designs are committed.

Kernel Core Architecture selection, boot, memory manager

Driver Framework Device model, I/O scheduling, DMA management

Process Management Scheduler, IPC, thread model, signals

Userspace Services Init system, service management, filesystem

Security Model Capability system, MAC policy, audit framework

Expert Expansion Pattern

Kernel to Drivers: Kernel architecture experts identify driver interface constraints. Driver specialists evaluate whether the proposed interfaces support required device classes (storage, network, display, input).
Drivers to Userspace: Driver framework design exposes system call interface requirements. Userspace specialists review whether the syscall surface is sufficient, secure, and performance-viable for target applications.
Userspace to Security: Userspace service design reveals the access control requirements. Security specialists evaluate whether the proposed capability model provides the necessary granularity without excessive complexity.

This case study is in progress. Design review results will be published as each OS layer passes its FDRP gate review.

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