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§§§ (x86) cause delay by IO to 0x80

this article says “to output any byte to the port 0x80 should delay exactly 1 microsecond”. But I can’t find a reference yet.

/arch/x86/boot/boot.h

static inline void io_delay(void)
{
	const u16 DELAY_PORT = 0x80;
	outb(0, DELAY_PORT);
}

More: https://stackoverflow.com/questions/6793899/what-does-the-0x80-port-address-connect-to





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