From mboxrd@z Thu Jan 1 00:00:00 1970
From: htmldeveloper@gmail.com (Peter Teoh)
Date: Tue, 31 May 2011 23:27:00 +0800
Subject: Can i allocate 4GB virtual addresses (more than a certain limit)
using vmalloc?
In-Reply-To:
References:
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To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org
To answer your subject: I think the straight answer is "no". Many
reason, among them:
ARM is still 32-bit, at least at the present moment:
http://www.google.com/search?q=does+arm+have+64bit&num=100
so with hardware 32-bit based, doing MMU at the 64-bit level is still
not possible (without the MMU 64-bit hardware architecture, I don't
think it is possible to do any >4GB memory translation stuff. Am I
not wrong?
On Tue, May 31, 2011 at 1:54 PM, sandeep kumar
wrote:
> Hi all,
> The following link gives the memory map for the arm architecture.
> http://www.arm.linux.org.uk/developer/memory.txt
>
> I have the following doubts..
> 1) Any chipset(based on arm) manufacturer(qualcom,samsung..) should follow
> the same memory map.
> Is it hardly constrained or can be changed?
> Where are?this constraints are implemented in the kernel source tree?
>
> 2) while i was student,?i read in?OS concepts?that, "Virtual memory gives?an
> illusion?to a?process,
> that it?has always a larger?continuous address space (even more than RAM)
> available to it."
> So i thought i could allocate howmuch ever memory i want.
> But seeing the above link,i observed?there is some limitation in the address
> space created by the vmalloc().
> So i m now thinking that vmalloc has some?limit.
>
> Please make me clear these things....
>
>
> With regards,
> Sandeep Kumar Anantapalli,
>
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>
>
--
Regards,
Peter Teoh