Christer Weinigel wrote:

out 80h, al is only two bytes.  Any alternative that has been suggested
in this discussion will use more space.  mov dx, alt_port; out dx, al
will be larger, a function call will definitely be a lot larger. People
have been making changes to the kernel to save a couple of hundred
bytes of text size.


If text size becomes a problem in this case, then we can use an alternatives-like mechanism to fix up the kernel. However, realistically this probably should be a function call *combined with* the out and in; that reduces the impact somewhat.

        -hpa
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