[comp.arch] mapping bothers physical i-cache?

andrew@frip.wv.tek.com (Andrew Klossner) (03/29/89)

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	"About physical i-caches: it is not clear to me that a context
	switch may not render lines in even physical i-caches invalid.
	In a processor where the i-fetch unit is what fills the
	i-cache, there is a chance that after a context switch the OS
	will map a different page (of instructions, perhaps) into a
	physical page frame that has some lines in the i-cache."

Huh?  If both the i-cache and the d-cache are physical, then it doesn't
matter what page mappings the OS sets up, since that's all upstream of
the cache.

  -=- Andrew Klossner   (uunet!tektronix!orca!frip!andrew)      [UUCP]
                        (andrew%frip.wv.tek.com@relay.cs.net)   [ARPA]