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global long_mode_start section .text bits 64 long_mode_start: ; load 0 into all data segment registers mov ax, 0 mov ss, ax mov ds, ax mov es, ax mov fs, ax mov gs, ax ; print `Uff!` to screen mov rax, 0x8521846683668255 mov qword [0xb8000], rax extern _start jmp _start