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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
Subject: early_res and find_e820_area for i386?
Date: Tue, 04 Mar 2008 11:38:03 +0800	[thread overview]
Message-ID: <1204601883.4707.96.camel@caritas-dev.intel.com> (raw)

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


             reply	other threads:[~2008-03-04  3:39 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-04  3:38 Huang, Ying [this message]
2008-03-04  4:23 ` early_res and find_e820_area for i386? H. Peter Anvin
2008-03-04 10:34   ` Ingo Molnar
2008-03-04 10:41 ` Andi Kleen
2008-03-04 10:48   ` Ingo Molnar
2008-03-04 11:46     ` Andi Kleen
2008-03-04 16:31     ` H. Peter Anvin

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