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- /* Tell GAS to generate 16 bit code. */
- .code16
- /* Don't listen to interrupts. */
- cli
- /* Zero ds.
- *
- * This is only needed if we are going to access memory.
- *
- * The program might work on QEMU without this, but fail on real hardware:
- * http://stackoverflow.com/questions/32508919/how-to-produce-a-minimal-bios-hello-world-boot-sector-with-gcc-that-works-from-a
- *
- * You cannot write immediates direclty to it, must pass through ax:
- * http://stackoverflow.com/questions/19074666/8086-why-cant-we-move-an-immediate-data-into-segment-register
- */
- xor %ax, %ax
- mov %ax, %ds
- /* Stop the processor. */
- ret
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