Architecture Overview

Sinux is organized into clearly separated subsystems. Architecture-specific code lives under arch/, while the portable kernel logic, memory managers, drivers, and userspace are kept apart.

Source tree

sinux/
├── arch/x86_64/        Architecture-specific (GDT, IDT, PIC, PIT, syscall, boot)
├── kernel/
│   ├── core/           kernel_main, panic, multiboot2 parser
│   ├── proc/           Process management, ELF loader, scheduler, usermode
│   ├── fs/             VFS, ramfs, ext2, procfs
│   ├── ipc/            Pipes, signals
│   └── syscall/        Syscall dispatch table
├── mm/                 Physical (PMM) and virtual (VMM) memory managers
├── drivers/            VGA, serial, keyboard, TTY, ATA
├── lib/                string, printk, io.h
├── userspace/
│   ├── libc/           Minimal C library
│   └── hello/          Example userspace program
├── boot/               grub.cfg, linker.ld
└── scripts/            iso.mk, qemu.mk, mkdisk.sh

Subsystem summary

Subsystem	Responsibility
arch/x86_64	Low-level CPU setup: GDT, IDT, PIC, PIT, syscall entry, boot stub
kernel/core	Entry point, panic handling, Multiboot2 parsing
kernel/proc	Processes, scheduler, ELF64 loader, ring-3 transitions
kernel/fs	VFS abstraction over ramfs, ext2, and procfs
kernel/ipc	Pipes and signal delivery
kernel/syscall	Syscall dispatch table (Linux x86_64 ABI)
mm	Physical (PMM) and virtual (VMM) memory management
drivers	VGA text, serial COM1, PS/2 keyboard, TTY, ATA PIO
userspace	Minimal libc and example programs

Continue to the boot flow to see how the kernel comes up, or jump to the memory layout.