an x86 operating system project built using C 20

• 1. Building
  • 1.1. Cross-compiling GCC
  • 1.2. Building xos
• 2. Running
  • 2.1. Running in QEMU
• 3. License

I develop XOS on an Arch machine, so I don't guarantee buildability for any of the other distributions (Debian, Ubuntu, etc.). The toolchain I currently use is GCC 10.2.0

pacman -Syu base-devel gmp libmpc mpfr

Download the newest Binutils and GCC and extract them wherever.

Set PREFIX to the directory you want your toolchain installed into. If the prefix is not a root directory, you don't need sudo for make install commands.

export PREFIX="/usr/local/gcc/i686-elf"
export TARGET="i686-elf"
export PATH="$PREFIX/bin:$PATH"

binutils is the source directory you extracted them to.

cd binutils
mkdir build
cd build

../configure --target=$TARGET --prefix="$PREFIX" --with-sysroot --disable-nls --disable-werror
make
sudo make install

gcc is the source directory you extracted them to.

cd gcc
mkdir build
cd build

../configure --target=$TARGET --prefix="$PREFIX" --disable-nls --enable-languages=c,c   --without-headers
make all-gcc
make all-target-libgcc
sudo make install-gcc
sudo make install-target-libgcc

The only way currently to get the sources is via the xos git repository. You can download a zip archive or use git.

git clone [email protected]:xgallom/xos.git

Set XOS_SYSROOT to the directory you have installed your toolchain into.

cd xos
mkdir build
cd build

XOS_BUILD_TYPE=Release XOS_ARCH=i386 XOS_SYSROOT=/usr/local/gcc/i686-elf ../configure

Making a bootable iso requires GRUB v2 and xorriso.

# For building a multiboot executable
make xos

# For building an iso via grub-mkrescue
make build_image_root

qemu-system-i386 -kernel "./xos/xos"

qemu-system-i386 -cdrom "./xos.iso"

This software is licensed with the GPLv2, available in the attached LICENSE.md file.

Copyright (C) 2020 Milan Gallo