aiaos

A C89 nostdlib bare metal 64bit operating system with a custom bootloader.

The name AIAOS is a simplification and stands for "Application is an Operating System".

Warning

THIS PROJECT IS A WORK IN PROGRESS! ANYTHING CAN CHANGE AT ANY MOMENT WITHOUT ANY NOTICE! USE THIS PROJECT AT YOUR OWN RISK!

Quick Start

On Windows just run the "build.bat" file which compiles and links the bootloader and kernel and creates an elf bootable image.

Building Windows cross compilation setup

In this section we will build an x86_64-elf cross compiler based on GCC using the MSYS2 subsystem.

Download and Install the MSYS2 package: https://www.msys2.org/wiki/MSYS2-installation/

Once you have it setup install nasm (needed for assembly files), gcc and other libraries needed for gcc cross compilation:

pacman -S base-devel make nasm gcc mingw-w64-x86_64-gcc mingw-w64-x86_64-qemu git gmp-devel mpfr-devel mpc-devel mpc isl-devel zlib-devel

Verify in the MSYS2 shell that they are installed:

make --version
nasm --version
gcc --version

Build x86_64-elf binutils for objcopy and ld linker command:

git clone --depth 1 https://sourceware.org/git/binutils-gdb.git
cd binutils-gdb
./configure --target=x86_64-elf --prefix=$HOME/opt/cross --disable-nls --disable-werror
make -j$(nproc)
make install
cd ..

Build x86_64-elf gcc cross compiler:

git clone --depth 1 https://gcc.gnu.org/git/gcc.git gcc-src
cd gcc-src
./contrib/download_prerequisites

mkdir build-gcc
cd build-gcc
../configure --target=x86_64-elf --prefix=$HOME/opt/cross --disable-nls --enable-languages=c --without-headers
make all-gcc -j$(nproc)
make all-target-libgcc -j$(nproc)
make install-gcc
make install-target-libgcc

Afterwards you should be able to call these executables:

x86_64-elf-gcc --version
x86_64-elf-ld --version
x86_64-elf-objcopy --version