Toy operating system

This is a toy 32bit operating system based on the x86 bare bones series written in C11 and some assembler. This OS is a learning exercise to myself and reference to others.

Build

Toolchain

You will need to setup a cross compiler toolchain for gcc and binutils in $HOME/Tmp/toolchain-i686.

First setup the environment so $TARGET,$PATH and $PREFIX are initilized.

source ./setupenv.sh

Then from the same shell run:

mkdir -p third_party
cd third_party
wget ftp://ftp.fu-berlin.de/unix/gnu/binutils/binutils-2.27.tar.bz2
atool -x binutils-2.27.tar.bz2
cd bintuitl-2.27
mkdir build
cd build
../configure --target=$TARGET --prefix="$PREFIX" --with-sysroot --disable-nls
make -j`nproc`
make install

This will compile and install binutils for the target platfrom i686. To compile and install GCC 6.2 run the following:

mkdir -p third_party
cd third_party
wget ftp://ftp.fu-berlin.de/unix/languages/gcc/releases/gcc-6.2.0/gcc-6.2.0.tar.bz2
atool -x gcc-6.2.0.tar.bz2
cd gcc-6.2.0
mkdir build
cd build
../configure --target=$TARGET --prefix="$PREFIX" --disable-nls --enable-languages=c,c++ --without-headers
make -j`nproc` all-gcc
make -j`nproc` all-target-libgcc
make install-gcc
make install-target-libgcc

Compile the Kernel

After you have setup the toolchain compile the kernel using:

source ./setupenv.sh
make

You can launch the kernel using make qemu if you have QEMU for i686 installed.

To compile and run test kernels run:

make tests

Things this OS does not have

• A filesystem
• Device drivers (other then VGA maybe)

Goals

• Simple VGA output
• Virtual memory
• Task management

Open questions

• Effort to port to ARMv7
• Effort to port to x86_64