haiirOS

My first Kernel based on C

Fun project to learn C, Assembly x86 and how Kernels work

Support for

• x86_64 little endian
• Legacy boot (enable CSM if you have UEFI)
• no RAID support (disable RAID in BIOS to get AHCI controller instead)

ToDo-List

• Documention
  • VGA text buffer
  • Paging
  • mapping
• drivers
  • AHCI
  • XHCI
  • NVMe
• Interrupts
  • Keyboard
  • timer
  • exceptions
• Memory
  • get memory map
  • create page tables
  • mapping
  • frame allocator (really basic)
    • use memory map
  • heap allocation
• Error handling
  • exceptions
• Basic IO
  • print
  • keyboard input
• Basic syscalls
  • write
  • exit
  • mmap
  • sched_yield
  • fork
  • open
  • read
  • close
  • shutdown
  • restart
  • kill
  • getcwd
  • mkdir
  • rmdir
  • rename
  • pause
  • nanosleep

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Environment

• OS:
  • Linux
  • Windows with WSL2
• IDE:
  • VSCode
  • Neovim

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Dev dependencies

• create iso:
  • sudo apt install grub2 xorriso (debian based)
  • sudo pacman -S libisoburn (arch based)
• VSCode:
  • install extension C/C++ (ms-vscode.cpptools) (language server / Debugging)
• Neovim:
  • install cpptools (Debugger)
  • install clangd (i.e. via lsp_installer) (language server)
• compiling/(assembling):
  • install nasm (assembler)
  • install ld (Linker)
  • install gcc (should already be installed) (C compiler)
  • install make (run Makefile / automation)
• Testing/Debugging:
  • install qemu/qemu-desktop (virtual-machine)

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Run kernel in a VM

• run make run

Debugging

• run make debug
• VSCode
  • press f5 or run task "(gdb) Launch"
  • using extension: "C/C++" (ms-vscode.cpptools)
• Neovim
  • press f5 or :lua require'dap'.continue()
  • using plugin: nvim-dap

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Resources

• Main source for developing an OS