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Im having problems locating avaiable memory for my 'os'.
When i boot up my code, i have no idea where is memory i can copy my code.

How do i find this memory? Is there any way, or i must list pci devices, get somehow ammount of memory, and find gaps?

How you do it? How it should be done?


Im using int 13h to access disk. (question 2: how do i do it without bios)

http://wiki.osdev.org/Detecting_Memory_%28x86%29
http://www.o3one.org/hwdocs/bios_doc/dosref22.html - Chapter 2

You don't - it's not safe. Your bootloader can however do the work for you, whether you use GRUB or write your own.

Whats not safe about it? Do you mean i have direct access to metadata (sector numbers, ecc, ...) wich wich i can destroy? I though i can only send commands like to read/write given sector, and controller can only low-level format disk. Are you telling, its possible using direct mmio/pio interface?

Sorry, I was referring to memory detection.