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NetBSD 6.1.5 - man page for x86_64_iopl (netbsd section 2)

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X86_64_IOPL(2)			  BSD/x86_64 System Calls Manual		   X86_64_IOPL(2)

NAME
     x86_64_iopl -- change the x86_64 I/O privilege level

LIBRARY
     x86_64 Architecture Library (libx86_64, -lx86_64)

SYNOPSIS
     #include <sys/types.h>
     #include <machine/sysarch.h>

     int
     x86_64_iopl(int iopl);

DESCRIPTION
     x86_64_iopl() sets the x86_64 I/O privilege level to the value specified by iopl.	This call
     is restricted to the super-user.

RETURN VALUES
     Upon successful completion, x86_64_iopl() returns 0.  Otherwise, a value of -1 is returned
     and the global variable errno is set to indicate the error.

ERRORS
     x86_64_iopl() will fail if:

     [EPERM]   The caller was not the super-user, or the operation was not permitted at the cur-
	       rent security level.

WARNING
     You can really hose your machine if you enable user-level I/O and write to hardware ports
     without care.

BSD					   July 3, 2002 				      BSD
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