Build Your Own OS #2

KERNEL_STACK_SIZE equ 4096            ; size of stack in bytes

section .bss
align 4 ; align at 4 bytes
kernel_stack: ; label points to beginning of memory
resb KERNEL_STACK_SIZE ; reserve stack for the kernel
mov esp, kernel_stack + KERNEL_STACK_SIZE   ; point esp to the start of the
int sum_of_three(int arg1, int arg2, int arg3)
return arg1 + arg2 + arg3;
external sum_of_three   ; the function sum_of_three is defined elsewhere

push dword 3 ; arg3
push dword 2 ; arg2
push dword 1 ; arg1
call sum_of_three ; call the function, the result will be in eax
-m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs
-Wall -Wextra -Werror
|-- bochsrc.txt
|-- iso
| |-- boot
| |-- grub
| |-- menu.lst
| |-- stage2_eltorito
|-- kmain.c
|-- loader.s
|-- Makefile




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Niroshan Pushparaj

Niroshan Pushparaj

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