simple protected mode code runner qemu-system-i386

; File: kernel.asm

; Assemble and link to a Mulitboot ELF executable using:
;     nasm -felf32 kernel.asm -o kernel.o
;     ld -Ttext=0x100000 -melf_i386 kernel.o -o kernel.elf
;
; Run in QEMU with:
;     qemu-system-i386 -kernel kernel.elf

bits 32
global _start

MB1_MAGIC    equ 0x1badb002
MB1_FLAGS    equ 0x0
MB1_CHECKSUM equ -MB1_MAGIC

section .text
align 4
    dd MB1_MAGIC
    dd MB1_FLAGS
    dd MB1_CHECKSUM

_start:
    ; Insert code here
    mov dword [0xb8000], 0x2f4b2f4f

    ; End with infinite loop
    cli
hltloop:
    hlt
    jmp hltloop