CVS commit: src/sys/arch

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Tue Mar 24 15:57:00 UTC 2026

Modified Files:
        src/sys/arch/m68k/include: cpu.h
        src/sys/arch/m68k/m68k: mmu_subr.s
        src/sys/arch/news68k/include: cpu.h types.h
        src/sys/arch/news68k/news68k: genassym.cf locore.s

Log Message:
Re-do the way the news1700's external cache vs. 68030 cache burst mode
issue is dealt with.

Rather than completely re-defining the high-level cache operation macros
to exclude the *_BE bits (which actually penalized systems without an EC
because the *_BE bits set in the CACR initiallly would be lost on the first
cache operation), instead we provide a "platform has dynamic CACR values"
hook.

For NEWS, the values default to the with-*_BE variant, but if an external
cache is discovered, the values are patched up with the non-*_BE variants.
Only one shared assembly language routine needs to be adjusted for this,
the rest of the scenarios where these values are used are handled by the
compiler via constraints.

For all other platforms that don't define __HAVE_M68K_DYNAMIC_CACR,
the values remain compile-time constants, as before.


To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/sys/arch/m68k/include/cpu.h
cvs rdiff -u -r1.4 -r1.5 src/sys/arch/m68k/m68k/mmu_subr.s
cvs rdiff -u -r1.58 -r1.59 src/sys/arch/news68k/include/cpu.h
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/news68k/include/types.h
cvs rdiff -u -r1.42 -r1.43 src/sys/arch/news68k/news68k/genassym.cf
cvs rdiff -u -r1.110 -r1.111 src/sys/arch/news68k/news68k/locore.s

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.