Building an OS - 6 - FAT subdirectory support

We adapt and improve the FAT driver written in part 3, adding support for parsing entire paths, and providing an stdio.h - like FILE API.

Links:

Documentation:

Chapters:
0:00 Introduction
0:35 Implementing DISK functions
12:44 FAT API
15:57 Implementing FAT initialize
22:19 Implementing FAT open
36:37 Implementing FAT read
41:00 Implementing FAT read directory entry
41:18 Implementing FAT close
41:34 Implementing FAT find file
44:38 Testing
47:40 Debugging
1:04:39 Conclusion

[treytomes]

I loved that portion on debugging. I've had too many days like that.

[redhawk]

I had to do a low level file system on Linux for Uni, and this is very much so what we had to do. It was extremely hard to program and the teacher wasn't as helpful as he should of.

[crazygames]

At the flashback I thought YouTube was glitching or something

[meiskam]

why is this complicated fat driver and custom libraries needed while still in stage2? isn't the cpu still in 16 bit real mode, meaning this won't be reusable once the kernel is loaded?

[alexandrubossro]

i am struggling with context switching and address spaces... maybe in the future you'll make a tutorial about this, but this tutorial made me understand even better the things about an operating system

[imafishI]

It only took you 3 hours to fix all the bugs? Unbelievable! I might took me a day.

[sreyanchakravarty]

Please don't stop with these low level videos. There are very little information about these topics out there.

[burhanuddinmurtazatinwala]

in x86.asm, the disk read function is taking the drive number which is 8 bit from bp+4 position and the next arguement from bp+6 but it is 8 bits so only 8 bits would have been pushed onto stack right?, why are we considering 16 bits

[swartex]

what theme are you using in VSCode in this video??

[omarfaruk]

thank you broh, i was finding this. will you please give me which destro you are using ??

[caibi_]

Is it possible to change fat12 to exfat after reaching this point?

[Shadowblitz]

you might have a bug when reading folders. I tried opening and reading the mydir folder and it spammed alot of whitespace

[Airknightangel]

Hey! Can you please explain the purpose of "far". It seems you just define it, but i dont see why is this relevant. Thank you!