The 16-bit assembly Operating System 16 year old me wrote in college.
This project sat untouched for quite a few years before finding the source on an old Linux installation. I've been having fun working on it so except some updates every now and then.
The project is pretty pointless and serves as nothing but an assembly playground project for me.
- Working filesystem ( bs:fs v1 )
- Basic commands for navigation
- Shell command line
- User login
Before the shell is started, the kernel will load the login program where you will be prompted to enter a username and password. This will be checked and load the shell.
Default users
root :: 123
krnsh :: 000
You can add new users to /usr.txt following the established format.
Currently the login is more of a detail thing as user permissions were never added into the filesystem, though I do have plans on changing this in the future.
EpicOS uses its own filesystem bs:fs (BullSh#t FileSystem) The filesystem data starts at sector 16 where 4 sectors store the entities which consist of 40 bytes.
0x0 - File type
0x1 - File ID
0x2 - Parent ID
0x3 - Global flag
0x4 - File name ( rest of the space )
File types
0x0 - Directory
0x1 - Binary file
0x2 - Kernel File
0x3 - Text file
Parent ID referrs to the entity ID the file belongs to which is usually a directory though is not limited as such.
The global flag declares if the directory has to be checked or whether it can be accessed anywhere. For example, programs such as ls or cd are stored in the /bin/ directory and are set as global
The contents of the file is stored after the 4 sectors of entity data. This location can be found with the following:
entity_data + (4 * 512) + (file_id * 512)
However, this means in bs:fs v1, files can only be 512 bytes large until I work on expanding and disk fragmenting more.