Luna/kernel/src/main.asm

global _main
extern _start

_main:
    xor rbp, rbp
    call _start

global _userspace
_userspace:
    mov rdi, 4000 ; 4000 ms / 4 seconds
    int 33h ; Sleep
    mov rcx, 10
.loop:
    dec rcx
    mov rdi, .message
    int 32h ; Print string
    mov rdi, 200 ; 200 ms / 0.2 seconds
    int 33h ; Sleep
    cmp rcx, 0
    jne .loop
    cli ; WE ARE IN RING 3!! So this should GPF and the kernel should exit us as "misbehaved"
    int 31h ; Exit current task
.message:
    db "hello from userspace!", 0xA, 0