Holler. I posted a list of examples to linux-kernel already. iopl and ioperm
are not portable in the way /dev/port is. ioperm/iopl also doesnt work
with most scripting languages, java tools trying to avoid JNI etc
I've seen it used in tools written in java, python, perl, even tcl
Other examples include libieee1284, the pic 16x84 programmer, hwclock,
older kbdrate, /sbin/clock on machines that don't have /dev/rtc.
Not everything in the world is an x86, and not every app wants to be Linux/x86
specific or use weird syscalls
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