linux-kernel - Booting Kernel from a Higher Physical Memory Base on x86/x86

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Message-ID: <b2ac5deb0910120709y59051b92s64d20374d3ef32e8@mail.gmail.com>
Date:	Mon, 12 Oct 2009 19:39:50 +0530
From:	Swapnil Pimpale <swapnil.pict@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Booting Kernel from a Higher Physical Memory Base on x86/x86_64

Hi All,

I want to run a kernel in a higher physical offset. i.e. If I have 1
GB of memory, I want to give only upper 512 MB to the kernel and keep
lower 512 MB free (not mapped in virtual memory). Is this possible for
x86 or x86_64 architecture?

I have found that there is a PHYS_OFFSET macro in arm kernel which
makes it possible to use higher physical base address. Is there
anything similar to this for x86/x86_64?

Thanks in advance,
Swapnil Pimpale
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