Ars Boretskii OC

UNIX like, multitask, i80386 PM + MMU, well-commented.

Well commented kernel based on micro architecture. This helps you to write your own OC. Main goal to give you small well-commended features that you can reuse in your OC. Currently all tasks work in kernel mode.

Content

• scheduler (/kernel/sched)
• initial ram disk (/initrd)
• shell task (/initrd/sh.c)
• tty character device driver (/kernel/dev/tty.c)
• abstract file operations (/kernel/vfs/file.c)
• interprocess communication (/kernel/ipc)
• architecture support (/arch)
• small c lib with lists support (/lib)

Info

Target processor: i80386 (Protected mode).

Dependencies

First, share folder on via VirtualBox.

$ VBoxManage sharedfolder add <vmname> --name <name> --hostpath <path>

On your guest os:
$ sudo apt-get install virtualbox-guest-utils
$ sudo mount -t vboxsf -o uid=1000,gid=1000 <name> <target-path>

When shared folder is ready, install build tools.

Linux lite (support qemu only):
$ sudo apt-get install gcc
$ sudo apt-get install gcc-arm-none-eabi
$ sudo apt-get install qemu

Ubuntu (support both bochs and qemu):
$ sudo apt-get install gcc
$ sudo apt-get install bochs
$ sudo apt-get install bochs-x

Build sources and run on qemu

Qemu x86:
$ mkdir bin
$ sudo make qemu-x86

Qemu arm:
$ mkdir bin
$ sudo make qemu-arm

Build sources and run on bochs

Bochs x86:
$ sudo mkdir bin
$ sudo mkdir /mnt/kernel_u
$ sudo losetup -a               # check loop13 is free
$ sudo losetup -d /dev/loop13   # release it if not free
$ sudo losetup -a               # make shure loop13 is not present
$ sudo make bochs-x86

Shell commands

Process list:

Ars Boretskii kernel 1.0
# ps

Exit from current process (returns you to kernel console):

Ars Boretskii kernel 1.0
# exit

Kill process:

Ars Boretskii kernel 1.0
# kill 1

Exec elf on initrd:

Ars Boretskii kernel 1.0
# exec <name>

Clear screen:

Ars Boretskii kernel 1.0
# clear

Example:

Ars Boretskii kernel 1.0
# ps
# clear
# exec sh.elf
# ps
# kill 4
# exit

Contributors

• Ilya Starchenko (thanks for bochs)

Wish list

• User mode & TSS (ring3)
• Extend initrd to support more that 4Kb (reseach needed why qemu cut it)
• Forth interpreter (as next initrd elf)