anderson@granite.cr.bull.com (David Anderson) (12/21/89)
Just wondering...
It seems that MIPS has thrown out "upward compatibility" in designing
the 6000, since "/usr/include/sys/immu_r6000.h" defines 16K pages,
a resulting difference in the TLB EntryLo register, i.e. a 22 bit PFN,
and of course a change in all of the page-size-related constants.
Is there an addendum or update to Gary Kane's book that outlines
the differences between MIPS current processor line and the upcoming
6000?
==============================================================================
Dave Anderson
Bull HN Information Systems anderson@granite.cr.bull.com
300 Concord Road.
Billerica, MA 01862 508-671-3253
==============================================================================rogerk@mips.COM (Roger B.A. Klorese) (12/22/89)
In article <1989Dec21.150346.10211@granite.cr.bull.com> anderson@granite.cr.bull.com (David Anderson) writes: > It seems that MIPS has thrown out "upward compatibility" in designing > the 6000, since "/usr/include/sys/immu_r6000.h" defines 16K pages, > a resulting difference in the TLB EntryLo register, i.e. a 22 bit PFN, > and of course a change in all of the page-size-related constants. Upward compatibility for user-mode programs is guaranteed. Kernel-mode and diagnostic-mode software is indeed incompatible, but some of it is incompatible between machines implemented with R2000s or R3000s (due to different memory system implementations, etc.). > Is there an addendum or update to Gary Kane's book that outlines > the differences between MIPS current processor line and the upcoming > 6000? Remember that the RC6280 is not yet shipping, and the R6000 chipset is not announced as a chip product. There is a new edition of the Book "MIPS RISC Architecture" (by Joe Heinrich and Gerry Kane) currently in review, for publication early next year. It covers the ISA extensions, as well as more detail, opcode bit patterns, etc. for all MIPS processors. -- ROGER B.A. KLORESE MIPS Computer Systems, Inc. phone: +1 408 720-2939 928 E. Arques Ave. Sunnyvale, CA 94086 rogerk@mips.COM {ames,decwrl,pyramid}!mips!rogerk "Two guys, one cart, fresh pasta... *you* figure it out." -- Suzanne Sugarbaker