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Re: calculating physical memory address


On Tue, 8 Nov 2005, Greg Freemyer wrote:

On 11/8/05, pkirsch@xxxxxxxxxx <pkirsch@xxxxxxxxxx> wrote:
hey,

can somebody tell me, which function translates the real physical memory
address to the linear logical address.

thanks. 

Are you talking about the translation that occurs each and every time
RAM is accessed?

That is done in hardware.  CPU asks for a logical address, MMU
converts that to a physical address on the fly.  Details are
architecture specific.

I think he meant the reverse page table lookup, i.e., from a physical memory address to a virtual memory address. In the Linux kernel, this is done by rmap. Read mm/rmap.c

-
Hai


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