Toro kernel

A dedicated kernel for multi-threading applications.

Thursday, May 24, 2018

Booting Toro in 123ms on QEMU-Lite

Hello folks! I have spent some time to port Toro to QEMU-Lite. This work is still very experimental and can be found in the branch feature-bootforqemu-lite. If you want to know more about QEMU-Lite check this great presentation. Roughly speaking,  QEMU-Lite is an improved version of QEMU, which is dedicated to boot a Linux kernel guest. QEMU-Lite improves the booting time by removing unnecessary steps in the booting process. For example, it removes the BIOS and the need of a bootloader. When QEMU jumps to the kernel code, the microprocessor is already in 64 bit long mode with paging enabled. To make Toro works on QEMU-Lite, I have to remove the whole bootloader and replace it by a simpler one that supports the Multiboot standar. So far I am only able to boot the application ToroHello.pas that takes only 123ms to boot. Future work will be to support multiprocessing so stay tuned!

Cheers, Matias.

Friday, April 20, 2018

Easing the sharing of files between host and guest by using the Qemu Fat feature

Hello folks! I have just committed the first version of a fat driver. This driver together with the vfat interface of Qemu eases the sharing of files between the guest and the host. This new feature relies on the mechanism of Qemu to present to a guest a fat partition from a directory in the host. This mechanism is enabled by passing "-drive file=fat:rw:ToroFiles", where ToroFiles is the path of a directory in the host machine. By doing so, Qemu presents to the guest a new block device in which there is a fat partition that includes all the file structure of the ToroFiles directory. Depending on some flags, the partition can be either fat32 or fat16. From the qemu's source code, it seems fat32 is not tested enough so I decided to support fat16 only. The main benefits of this mechanism is to ease the sharing of files between the guest and the host. The main drawback is you should not modify the directory while the guest is running because Qemu may get confused. To know more about this fetaure in qemu, you can visit The commit that adds this feature can be found here For the moment, the driver allows only read operations. I expect to have writing operations soon.


Saturday, February 10, 2018

Docker image to compile Toro on Linux, Part II

In the first part of this post (here), I explained how to use a docker image to compile Toro. I worked a bit on this procedure and I modified to make it use the container. To compile Toro by using, you need first to install docker and then follow these steps:
1. Pull the docker image from dokerhub
docker pull torokernel/ubuntu-for-toro
2. Clone torokernel git repo
3. Go to torokernel/examples and run:
./ ToroHello 
If everything goes well, you will get ToroHello.img in torokernel/examples. In addition, if you have installed KVM, you will get an instance of a Toro guest that runs ToroHello.  


Monday, February 05, 2018

Docker image to compile Toro

Hello folks! I just created a docker image to compile Toro kernel examples. You can find the image in To try it, follow the steps:

1. Install docker. You can find a good tutorial in

2. Once installed, in a command line run:

 docker pull torokernel/ubuntu-for-toro

3. Clone ToroKernel repository that will be used to provide the code to be compiled:

git clone

and then move current directory to ./torokernel

4. In a command line, run:

sudo docker run -it -v $(pwd):/home/torokernel torokernel/ubuntu-for-toro bash 

This command returns a bash in which current directory, i.e., torokernel directory, is mounted at /home/torokernel. So now we can just go to /home/torokernel/examples and run:

wine c:/lazarus/lazbuild.exe ToroHello.lpi

This will compile and build ToroHello.img. When we are done in the Docker, we can Exit.