Christopher R. Johnson cjohnson at
Thu Apr 29 02:04:21 EST 2004

I stand humbled before the master.  Not that I ever doubted, really.
 Please forward information regarding your favorite local bar or liquor
store, along with your beer preference.

Is there a concept of having "I/O permissions" for user mode programs on
ppc?  If so, how do they acquire such permission?

Wolfgang Denk wrote:

>In message <408EACA5.8090005 at> you wrote:
>>Normally I would agree, except that he's getting link errors with
>>ioperm, inb and outb - he's not even running the code.  As to whether
>>the code will work, you have an excellent point.  Maybe we're both
>>right, so beers all around!
>He's on a PowerPC system. Quoting "arch/ppc/kernel/syscalls.c":
>int sys_ioperm(unsigned long from, unsigned long num, int on)
>	printk(KERN_ERR "sys_ioperm()\n");
>	return -EIO;
>Guess what?
>Wolfgang Denk
>Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
>Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at
>If you think the problem is bad now, just wait until we've solved it.
>                                                        Epstein's Law

Christopher R. Johnson
Principal Software Engineer
GCC Printers

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