File API info soon? about os-tutorial HOT 7 OPEN

Thanks for the comments @0xqookie, I'll definitely check those.

To all, sorry for the delays, this is a hobby project and I haven't had much time to update it, but it's definitely one of my priorities as soon as I can.

from os-tutorial.

@cfenollosa More links: http://wiki.osdev.org/PCI_IDE_Controller For writing an ATA/ATAPI driver.
My own ATA(No ATAPI) driver implementation:
https://gist.github.com/0xqookie/55926338493adcc337ff893c54558bc9
https://gist.github.com/0xqookie/61f5e6f1f4389cb45ddee6c3644e34c6
https://gist.github.com/0xqookie/da3c9b6ac585054a6336c13435ed5797
text_putstring() is kprint()
uint(x)_t is u(x) from cpu/types.h (eg. uint16_t = u16)

from os-tutorial.

This is what I'm currently into. And it's much more difficult than I expected.

Implementing FAT is easy, but to read from disk, you can either let the BIOS do it or implement an ATA/floppy driver. Many example OSs like this one just read from the disk in real mode, in assembly.

This is still undefined, but I'll probably try to make a dirty asm wrapper to read from disk, test the FAT driver, make the ATA/floppy driver, whichever is easier since qemu can mount disk images as both, then push the code. This will probably take a few weeks.

Thanks for your comments!

from os-tutorial.

I've been continuing my research into filesystems and the likes and it seems that the ASM wrapper SHOULD be the easiest way to go.

As a matter of personal opinion, I'm pretty much a happy camper as an OSdev if I can manage to get a simplistic shell with a simple text editor installed and running on a real device. :P

I shall be eagerly awaiting any updates while I muck about with liveUSBs and whatnot. Thanks again for making this tutorial, it's been immensely helpful!

from os-tutorial.

@cfenollosa You could take a look at DankOS floppy disk read routines. https://github.com/DankOSTeam/DankOS/tree/master/kernel/external/disk
Just realized it uses bios interrupt 0x13

from os-tutorial.

@cfenollosa You can also see this page http://web.archive.org/web/20041010081013/http://debs.future.easyspace.com/Programming/Hardware/FDC/floppy.html

from os-tutorial.

https://wiki.osdev.org/Floppy_Disk_Controller

EDIT:

https://wiki.osdev.org/ATA_read/write_sectors
https://board.flatassembler.net/topic.php?t=14373
https://programmersheaven.com/discussion/312492/how-to-get-bytes-from-hard-disk-inside-the-protected-mode-32-bit

from os-tutorial.