From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Thu, 01 Aug 2002 18:17:00 +0000 Subject: Re: [Linux-ia64] 64K pages on Itanium 1 Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Fri, 02 Aug 2002 01:00:42 +1000, Keith Owens said: Keith> A recent 2.4.18 ia64 patch removed 64K page support for Keith> Itanium 1, only allowing it for McKinley. What is the Keith> restriction on Itanium 1? I have a test case that needs 64K Keith> pages and I was hoping to run it on Big Sur. The simple test Keith> of allowing 64K for Itanium 1 breaks as soon as it enters Keith> user space, during binfmt_elf processing. The problem is that Itanium 1 has few enough virtual address bits that with 64KB pages, you end up with an overlap between the user address space and the virtually mapped linear page table. This can be worked around (there was a patch from someone at SGI, at some point), but it wasn't very clean and I didn't think it's worth bothering with it introduced, given that Itanium 2 solves the problem automagically (since it supports the full 64 bits of virtual address space). --david