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
    mov rax, 2 ; sys_sleep
    int 42h ; syscall
    mov rcx, 10
.loop:
    dec rcx
    mov rdi, .message
    mov rsi, 22
    mov rax, 3 ; sys_write
    int 42h ; syscall
    mov rdi, 200 ; 200 ms / 0.2 seconds
    mov rax, 2
    int 42h ; syscall
    cmp rcx, 0
    jne .loop
    mov rax, 0
    int 42h ; Exit current task
.message:
    db "hello from userspace!", 0xA, 0