MSIM is a computer simulator based on MIPS R4000. HelenOS mips32-msim target runs on MSIM and, since MSIM now runs on HelenOS, you can run HelenOS within HelenOS.
Running HelenOS in HelenOS
You need to configure your HelenOS build to include MSIM. You also need to transfer
a mips32-msim boot image (e.g.
and MSIM configuration file
onto the system. Either add them under
uspace/dist before building the system,
or mount them from a disk / virtual disk image (when running in an emulator).
Within HelenOS, change to the directory that contains
msim.conf and the system image
msim. (It can take a while to boot.)