I am reading some code of Linux. The keyboard.S has something like
outb %al,$0x61
and
inb $0x61,%al
I think the pending 'b' means 'byte', but i still cannot find what these instructions mean.
what does "outb" in AT&T asm mean?
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OUTandINare instructions for transferring data between I/O ports. Those are a couple of links I found which provide a bit more information.As you mentioned, the
bis thebyteform of those instructions, which is appropriate since you're using the lower byte ofax(al).