55 lines
2.1 KiB
Markdown
55 lines
2.1 KiB
Markdown
# What is this?
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This is a simple implementation of a computer kernel<br/>
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written in pure x86 assembly with features including
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- Read/Write disk operations
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- The ability to boot from the BIOS using the [JazzOS Bootloader](https://raw.githubusercontent.com/scprogramming/JazzOS/refs/heads/main/src/bootloader/boot.asm)
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- A modified [MikeOS BASIC interpreter](https://mikeos.sourceforge.net/handbook-appdev-basic.html)
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- A functional POSIX inspired CLI
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# What is it for?
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This project is aimed at people wanting to learn<br/>
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more about kernels and low level system functionality.<br/>
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In order to help with comprehension, there are a lot<br/>
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of inline comments descibing what each part does.
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# Commands
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- CAT <filename>: outputs the contents of the file.
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- LS: outputs a list of files on the system .
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- CLEAR: clears the screen.
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- REBOOT: reboots the system, this can also be done with [esc].
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- BAS <filename>: runs a basic script.
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# Running it
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In order to build this project on a Linux system run<br/>
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the following commands.
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```
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git clone https://git.javalsai.tuxcord.net/deadvey/crawos.git
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cd crawos
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sudo make
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```
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This will create a directory called 'disk_images' which<br/>
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contains optical and floppy images that can be ran in a<br/>
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virtual machine such as QEMU with
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```
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qemu-system-i386 -drive file=disk_images/crawos.img,if=floppy,format=raw
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```
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Or it can be burnt to a physical disk to be booted from<br/>
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hardware.
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# Development
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In order to run this project in testing mode you can use<br/>
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The 'test-linux.sh' bash script which will assemble and<br/>
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boot the virtual machine (QEMU) for testing purposes.<br/>
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```
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./test-linux.sh
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```
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This will dump the contents of memory in /dev/shm/qemu-ram<br/>
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To allow for easier debugging.
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# BASIC development
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Please refer to the [MikeOS BASIC documentation](https://mikeos.sourceforge.net/handbook-appdev-basic.html)<br/>
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docs on writing BASIC code. In order to create new<br/>
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files, place them in the /data/ directory, note the file<br/>
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names are limited to 11 characters due to FAT12 limitations<br/>
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(8 for the name and 3 for the extension).
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