Re:

[Timur Tabi <ttabi@interactivesi.com>]

** Reply to message from "hai huang" <haih@umich.edu> on Tue, 13 Feb 2001
09:11:23 -0800


> Thanks for your quick response Rik.  But to me, it seems that there must be
> some kind of mechanism similar to an inverted page table so the kernel knows
> which physical memory maps to which virtual memory. 

No, there isn't.

My current job required me to write a routine which would allow a driver to
allocate a specific physical page, provided that page was not already allocated.
In order for me to do that, I had to search the free physical page structures
for a block of free pages that contained the page I wanted.  When I found it, I
had to reorganize those structures so that get_free_pages would allocate that
particular block.

I would not have needed to do all this if there was a mapping that you describe.


-- 
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com

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