Can i allocate 4GB virtual addresses (more than a certain limit) using vmalloc?

[coolsandyforyou@gmail.com (sandeep kumar)]

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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