Re: [Linux-ia64] [PATCH] set ar.k0 on APs

From: David Mosberger <>
Date: 2002-04-02 10:15:25
>>>>> On Mon, 1 Apr 2002 16:54:20 -0700, Bjorn Helgaas <> said:

  Bjorn> We currently set ar.k0 on the BP, but not on the APs.  The following
  Bjorn> patch does it for APs as well.

  Bjorn> Apparently Intel firmware sets ar.k0, but HP firmware doesn't.
  Bjorn> If the kernel doesn't set ar.k0, X won't start up on APs because
  Bjorn> it uses ar.k0 to access I/O port space.

Sounds good.

  Bjorn> +	/*
  Bjorn> +	 * Set I/O port base per CPU
  Bjorn> +	 */
  Bjorn> +	ia64_set_kr(IA64_KR_IO_BASE, ia64_iobase & ~PAGE_OFFSET);

But you shouldn't mask anything with PAGE_OFFSET (it's a base-address,
not a mask).  __pa() can be used instead.  I see that setup.c had the
same problem, so I cleaned that up as well, plus I made it use
ioremap(), instead of hardcoding the formation of an uncachable


Received on Mon Apr 01 16:16:58 2002

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