x86_64 · c · nasm · solo build

CharisOS

A from-scratch operating system. Not a Linux fork. Not a tutorial project.

# CharisOS build status — 2026

# Phases 1-5 complete. Real status, not a roadmap promise.

[DONE] Phase 1 · Boot · GRUB2 multiboot, GDT, IDT, PIC, timer

[DONE] Phase 2 · Memory · PMM, VMM, paging, heap allocator

[DONE] Phase 3 · Syscalls · SYSCALL/SYSRET, capability security model

[DONE] Phase 4 · Filesystem · VFS layer, FAT32 driver, ELF binary loader

[DONE] Phase 5 · Graphics · Framebuffer stack, PSF2 bitmap font rendering

[WIP] Phase 6 · Desktop · Window manager, desktop shell, app loader

[WIP] Phase 7 · IPC · Inter-process communication, socket layer

Phase 8+ · Networking, audio, USB, SMP, ACPI — stubs exist

phases 1–5 detail

What's actually built

No vague claims — every item below compiles, links, and runs.

Boot & interrupts done

GRUB2 multiboot2, GDT with ring 0/3 descriptors, IDT, PIC, timer, keyboard driver

Memory management done

PMM (physical memory manager), VMM (virtual memory, 4-level paging), slab heap allocator

System calls done

SYSCALL/SYSRET (AMD64 fast path), capability-based security model, userspace ring 3 entry

Filesystem & ELF loader done

VFS abstraction layer, FAT32 driver (read/write), ELF64 binary loader with dynamic linking stubs

Framebuffer graphics done

UEFI/BIOS framebuffer driver, PSF2 bitmap font renderer, filled primitives, double-buffering

Window manager in progress

Framebuffer-backed WM, desktop shell, application launcher, Z-order management

IPC & networking in progress

Message-passing IPC, UNIX-style sockets, userspace socket API