SonnaOS

Writing an operating system to explore low-level architecture and hardware programming.
(because I want to occupy my time)

Hardware Requirements

• Firmware: UEFI
• CPU: 64-bit x86 processor with x2APIC support
• ACPI 2.0+

Kernel

Estella - x86_64 EFI kernel using the Limine bootloader protocol.

Current status

• ✅ UEFI boot via Limine bootloader on x86_64
• ✅ Long mode + higher-half kernel - by Limine
• ✅ Serial (COM1) debug output
• ✅ Framebuffer text console (PSF2 font: Spleen 12x24)
• ✅ Initrd (CPIO newc) with file lookup
• ✅ GDT + TSS
• ✅ IDT + basic exception handlers - ISRs
• ✅ ACPI parsing (RSDP, XSDT, MADT, HPET)
• ✅ x2APIC support
• ✅ LAPIC timer in TSC-deadline mode (when invariant TSC available)
• ✅ TSC frequency detection (CPUID 0x15/0x16 + HPET fallback calibration)
• ✅ Physical Memory Manager (PMM) with self-tests
• ✅ Virtual Memory Manager (VMM) with self-tests
• ✅ PS/2 keyboard driver
• ✅ Temporarily kernelspace shell
• ✅ Current UTC time with (boot_time via limine) + (tsc(time after boot))
• ✅ Loading program in ring3
• ✅ Elf loader
• 🚧 Syscalls: read(0), write (1), getpid(39), exit(60)
• 🚧 Userspace lib: crt0, printf
• ✅ A few example userspace programs in userspace/programs
• ✅ Preemptive round-robin scheduler (LAPIC TSC-deadline)

Requirements

• clang + ld.lld
• QEMU + OVMF
• make, git, curl/wget

Build & Run

git clone https://github.com/aprentxdev/SonnaOS
cd SonnaOS
make run