Subject: early_res and find_e820_area for i386?
From: "Huang, Ying" <ying.huang@intel.com>
To: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
       Thomas Gleixner <tglx@linutronix.de>, Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org
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Date: Tue, 04 Mar 2008 11:38:03 +0800
Message-Id: <1204601883.4707.96.camel@caritas-dev.intel.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi,

Before bootmem allocator is available, kernel needs allocate memory
pages such as page table and some NUMA structures. On x86_64, this is
done by early_res and find_e820_area. On i386, this is done through
using the memory area after kernel itself which is tracked with
init_pg_tables_end.

Is it better to implement early_res and find_e820_area on i386? Can we
trust E820 table on i386?

Or we add an early_alloc, which allocate memory from the memory area
after kernel itself and check the early_res areas and E820 table too.

BTW: Why not merge e820_32.c and e820_64.c? At least part of them.

Best Regards,
Huang Ying

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