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- From: crusoe@cs.tu-berlin.de (Andre' Zehl)
- Newsgroups: comp.arch,comp.sys.hp
- Subject: HP-PA softw. virtual addr. translation HOW ?
- Date: 27 Jan 1993 17:37:53 GMT
- Organization: Technical University of Berlin, Germany
- Lines: 21
- Message-ID: <1k6h9hINN6dm@news.cs.tu-berlin.de>
- NNTP-Posting-Host: zaphod.cs.tu-berlin.de
- Keywords: HP-PA
-
- I'm working on a preparation on the HP-PA RISC Architecture.I'm desparately
- trying to figure out, how you administer the virtual to physical address
- translation.
-
- Unfortunately HP's description of this translation is very vague. They
- describe, that the virtual page number is hashed, thus providing a pointer
- in a hashtable (the PDIR INdex) which provides a pointer in the physical
- page directory (to chained PDIR-Entrys), where the page attributes are
- stored (NOT the physical page number).
-
- The physical page number (ppn) is identical with the index from the
- hashtable. But this only makes sense, if it's not the virtual page number (vpn)
- which is hashed, but the physical page number, coming out of the
- hardware translation? IS THIS SO ? Is the PDIR Index of the hashtable vpn
- the hashed ppn or the hashed ?
-
- I need help _very_ urgently, so evry little hint is appreciated _very_ much!
- Thank you very much in advance! Please e-mail reply.
- --
- Andre'_________________________________________________________________________
- crusoe@cs.tu-berlin.de
-