README.md

printOS

How to setup

Requirements

• NASM
• gcc && g++
• Qemu (sudo apt install qemu qemu-utils qemu-system-x86 qemu-system-gui)

Start development

1. Download a GNU-EFI source code. Place it in the bootloader/gnuefi directory.
2. ./init.sh

Run OS

Tool chain: ./recompile.sh && ./build-img.sh && ./run.sh

Kernel

64-bit simple hobby kernel written in C++ for educational purpose and fun.

Features

• CPUID - state and features checking
• Framebuffer (double-buffering) driver, writing output, colors
• Basic read-only console (+ auto-scroll)
• GDT - flat model
• Physical memory allocator
• Virtual memory - 64-bit paging
• IDT - basic interrupts
• Very basic libc (it will be written further if needed)
• Kernel panic && asserts
• ACPI support
• Local APIC and I/O APIC support
• High Precision Event Timer (HPET): one-shot and periodic mode
• Heap (kmalloc & free)
• PS/2 driver (keyboard support)
• All x86 exceptions
• Uniprocessor multitasking
• User mode
• Virtual relocation over 0xFFFFFFFF

Bootloader (UEFI)

My GNU-EFI (UEFI) bootloader written in C for fun and education.

Features

• Reading kernel file from drive
• ELF kernel parsing and loading into memory
• Framebuffer initialization
• Memory map gathering
• Psf font loading
• ACPI support
• Error checking
• Jumping into kernel

Documentation & specifications abbreviations used in comments

• IM3 - Intel Manual, vol. 3
• EFI - UEFI Specification
• ACP - ACPI Documentation
• APC - APIC Specification
• IOA - IO APIC Documentation
• HPT - HPET Documentation