如何设置堆栈段

Question

Can some one help understand the how to set the stack for the OS.

As far as I understood, the SS is to be set by the "programmer" to 1024 (1k) and move the SP to the top of it, is that correct?

and I found the below on MikeOS tutorial, not sure how adding 544 to 07c0 will add 4k buffer

bootloader_start:

    mov ax, 07C0h           ; Set up 4K of stack space above buffer

    add ax, 544         ; 8k buffer = 512 paragraphs + 32 paragraphs 

Answer 1

This is the code I use to set the stack segment.

; NASM syntax
xor ax, ax ; or set ax to whatever segment you wish
mov ss, ax ; IIRC, you can't just go mov ss, 0
mov sp, 0xF000 ; or set sp to whatever you wish

I don't think I had to put the stack there. You can put it wherever you want, as long as you don't overwrite system data.