5.5.4. - Enabling I/O Ports On PC Platforms Running linux
On PC systems running
linux,
I/O port access is achieved by changing the process's
I/O privilege level using the system call
iopl().
For this method to work, the spec executable must be set-user-id
root.
Note, though, that the root privilege
is only enabled for the duration of the system
call.
The rest of the time, the process only has the access privileges of the
real user.
(Prior to spec release 4.03.01, I/O port access on
linux
required
a kernel patch.)
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