shellcode.s

[BITS 64]
%macro check_bit 1
    mov rcx, 1
    shl rcx, %1
    test rcx, rsi
    jz %%skip
    or rsi, rcx
    shl rcx, %1
    mov rcx, 1
    %%skip:
%endmacro

xor esi, esi
mov rdi, [0x2170000]
mov [0x2170000], rsi
mov rsi, rdi
mov rdi, rsi

%assign i 0 
%rep    64 
    check_bit i
%assign i i+1 
%endrep

mov rdi, 0
mov rax, 60
syscall