EvalynOS

A W.I.P 64 Bit OS Kernel

Compiling & Running

You will need to install the following arch packages to compile (Non inclusive, More testing needs to be done)

• base-devel
• python3
• qemu-desktop
• edk2-ovmf
• limine

You will need to run the get-deps script before starting

Compile with make

Run and compile with make run

Run and compile and generate symbols (Compiles twice) with make debug

Compile Flags

• -DMUTE_KERNEL_PANIC: Disables the 1khz tone played on a kernel panic for when doing active work on the kernel

Add these flags to the GNUmakefile CFLAGS section

Real Hardware

This kernel is designed to be able to run on REAL hardware if it meets the following requirements

• x86-64 CPU
• 512MB Memory
• A 1280x720 or higher monitor (1920x1080 recommended)
• A PS/2 keyboard
• A PC speaker

Copy the EFI folder and limine.conf and kernel.elf and initramfs.tar to the root of a GPT formatted USB stick with the boot and esp flags set and then boot to it

Kernel Mode Shell Commands

• TEST: Prints a test message
• CREDITS: Prints credits.txt
• CLEAR: Clears the terminal (ALIAS: CLS)
• CLEARFB: Clears the framebufer (ALIAS: CLSFB)
• MMAP: Prints the memory map provided by the bootloader
• PANIC: Causes a kernel panic
• FAULT: Causes a Page Fault to panic with extended info
• BADAPPLE: Plays the Bad Apple demo inside userspace