Writing a Microkernel OS in Rust: Memory Management & Scheduling

Writing an operating system in Rust combines the language's safety guarantees with the raw power of bare-metal programming. This series documents building a microkernel from the bootloader up.

Implementation Phases

1. **Freestanding Rust**: no_std, custom target specification, and bootable image creation
2. **VGA Text Mode & Serial**: Early debugging output without a display driver
3. **x86_64 Paging**: Identity mapping, recursive page tables, and kernel heap allocation
4. **Interrupt Handling**: IDT setup, PIC/APIC configuration, and syscall interface design
5. **Preemptive Multitasking**: An async/await executor for cooperative and preemptive scheduling
6. **Userspace Processes**: ELF binary loading, ring 3 transitions, and system calls

All code is available on GitHub with detailed commit history, and each phase includes unit tests and integration tests running in QEMU CI.