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Re: HIGHMEM

To: "Ralf Baechle" <ralf@linux-mips.org>
Subject: Re: HIGHMEM
From: "Hdei Nunoe" <nunoe@co-nss.co.jp>
Date: Tue, 14 Dec 2004 13:26:55 +0900
Cc: <linux-mips@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <001101c4dbf9$1da02270$3ca06096@NUNOE> <20041207095837.GA13264@linux-mips.org>
Sender: linux-mips-bounce@linux-mips.org
Ralf,

Thanks for the info! I still have a ocuple of question, hope you do not mind.

In 2.4 the support for CONFIG_DISCONTIG and CONFIG_NUMA are a bit tangled
with each other because IP27 is the only platform to uses these features
and it needs both.

Is it named "sgi-ip27"?

Other than that you can also just setup your system
as 0x0 - 0x10000000 being RAM, 0x10000000 - 0x20000000 being reserved
memory and 0x20000000 - 0x30000000 being highmem.  Which works but is a
bit wasteful.

The gap in physical memory is 0x10000000 - 0x20000000, but it is 0x90000000 - 0xC0000000 in virtual memory because there is K1 segment. So the macros such as __pa() or __va() does not work, I think. Started to wonder it might not be easy
as just changing the PAGE_OFFSET value.  Do you see?

cheers,
-hdei


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