⚠️ This is no longer maintained. ⚠️

Utero is an operating system (for x86_64) written in Crystal as much as possible.

This is the work in progress.

• Crystal 0.23.0
  • llvm
  • Please see All required libraries
• nasm
• grub-mkrescue
• xorriso
• qemu-system-x86_64
• mformat (included in mtools)
  • optional, See more details https://os.phil-opp.com/multiboot-kernel.html#creating-the-iso

To make an ISO file and run on Qemu

$ make run

To make an ISO file

$ make iso

To make a binary file of the kernel

$ make or $ make all

To compile the OS in DEBUG mode and run on Qemu

$ make debug

Note: in DEBUG mode, logging uses the serial port COM1 to write various debugging information. qemu is configured to write the output of this serial port to /tmp/serial.log.

To clean up

$ make clean

On a system that uses EFI boot, like dual boot macOS and Ubuntu(16.04) on MacBook Pro

Error on Qemu like this

Could not read from CDROM (code 0009)

The solution may be:

$ sudo apt-get install grub-pc-bin

After the install grub-pc-bin, you will need to recreate the ISO file like this:

$ make clean
$ make # or make iso
$ make run

The following links saved my life:

microsoft/WSL#1043

https://intermezzos.github.io/book/appendix/troubleshooting.html#Could%20not%20read%20from%20CDROM%20%28code%200009%29

1. Fork it ( https://github.com/UteroOS/utero-archive/fork )
2. Clone it (including submodules)

git clone --recursive <YOUR-FORKED-UTERO-URL>

or

git clone <YOUR-FORKED-UTERO-URL>
git submodule update --init --recursive

3. Create your feature branch (git checkout -b my-new-feature)
4. Commit your changes (git commit -am 'Add some feature')
5. Push to the branch (git push origin my-new-feature)
6. Create a new Pull Request

• noriyotcp Noriyo Akita - creator, maintainer, breeder of utero-archive

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.