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- Path: sparky!uunet!charon.amdahl.com!amdahl!JUTS!macaw!haw30
- From: haw30@macaw.ccc.amdahl.com (Henry A Worth)
- Newsgroups: comp.arch
- Subject: PA-RISC Virt Addr > 32 bits (was Re: Caches and Hashing)
- Message-ID: <baQk02L41el501@JUTS.ccc.amdahl.com>
- Date: 20 Aug 92 19:54:21 GMT
- References: <Bt5DKp.z0@netnews.jhuapl.edu> <1360024@aspen.NSA.HP.COM>
- Sender: netnews@ccc.amdahl.com
- Organization: Amdahl Corporation, Sunnyvale CA
- Lines: 20
-
- In article <1360024@aspen.NSA.HP.COM> morris@aspen.NSA.HP.COM (Dale Morris) writes:
- >
- > Although the user-visible virtual address space in current PA-RISC
- > products is 32-bit, PA machines actually implement a larger virtual
- > address space (48 bits in the snakes workstations). This large global
- > address space is used by the OS in many ways to improve performance.
-
- Is the >32 bit virtual addressing strictly limited to the OS, or is
- it possible for user processes to map multiple address spaces and use
- "far pointers"? If not, is there any announced intent to provide
- such features in future OS's? Likewise, does anyone know if >32 bit
- virtual addressing in user processes is (or will be) supported in OS's
- for the MIPS R4000 or IBM RS6000 (and, of course in a few years there will
- be the SPARC-64, late to the party again ;-) )?
-
- - Thanks
-
- --
- Henry Worth
- No, I don't speak for Amdahl... I'm not even sure I speak for myself.
-