jjwang / hanos

Microkernel-based General Purpose Operating System #Hobby OS#

HanOS - Microkernel-based General Purpose Operating System

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Design as below

• Bootloader: Limine is used to get the kernel running as quickly possible. Limine boot protocol is chosed by HanOS.
• CPU mode: x86-64 Long Mode is supported in HanOS. HanOS does not has plan to support other x86 modes.
• GUI: GUI will not be the 1st priority for HanOS. But HanOS will port some GUI libraries in the future.

Progress update

• Framebuffer based terminal and kernel log system
• Initialize GDT and IDT to handle exceptions
• Physical memory allocator and virtual memory manager
• Parse ACPI tables and initialize MADT
• Start up all CPUs
• Set up APIC(Advanced Programmable Interrupt Controller) interrupt controller
• Read RTC time from CMOS and configure HPET timer
• Scheduling driven by APIC timer
• Keyboard/mouse driver and command line interface
• VFS, FAT32 and RAMFS file system. RAMFS is for loading and executing program from ELF file
• Tasks of kernel and user space
• Background image display for command line interface
• Implement syscalls for bash and other system tools
• Simple userspace shell apps ported from xv6

Fonts

• Adopted 14px fonts from https://font.gohu.org/ and convert to psf1 using bdf2psf.

bdf2psf gohufont-14.bdf /usr/share/bdf2psf/standard.equivalents /usr/share/bdf2psf/ascii.set 256 gohufont-14.psf

How to run

• The disk image file - "hdd.img" in release folder can be used for test.

qemu-system-x86_64 -serial stdio -M q35 -m 1G -smp 2 -no-reboot -rtc base=localtime -drive id=handisk,if=ide,format=raw,bus=0,unit=0,file=hdd.img

Screenshots

• Oct 17, 2023: Userspace Shell Demo