Re: PowerPC VSID

I never found documentation on this matter.  Espen derived our  
solution: use the page directory address; this gives a unique ID for  
every address space, with no effort.  And it lets you reverse map the  
VSID to a page directory.

-Josh



On Apr 13, 2006, at 06:41, Matthias Lange wrote:

Hi,

after reading a lot in the PowerPC Programming Environments Manual to  
understand virtual addressing on PowerPC, I haven't found an answer  
to how VSIDs are determined/calculated on 32bit processors.

So, how do I determine/calculate this 24bit value for each of the 16  
segment registers? Or are the VSIDs fixed on 32bit processors and I  
don't need to do anything?

Can someone give me a pointer or a short explanation?

Thanks,

Matthias.

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