CVS commit: src/sys

["Nick Hudson" <skrll%netbsd.org@localhost>]

Module Name:    src
Committed By:   skrll
Date:           Sun Apr 19 15:09:50 UTC 2026

Modified Files:
        src/sys/arch/aarch64/aarch64: aarch64_tlb.c pmap.c pmap_machdep.c
        src/sys/arch/aarch64/include: pmap.h pmap_machdep.h
        src/sys/arch/arm/arm32: arm32_tlb.c pmap.c
        src/sys/arch/arm/include/arm32: pmap.h
        src/sys/arch/m68k/include: pmap_coldfire.h
        src/sys/arch/mips/include: pmap.h
        src/sys/arch/powerpc/include/booke: pmap.h
        src/sys/arch/riscv/include: pmap.h
        src/sys/arch/riscv/riscv: pmap_machdep.c
        src/sys/uvm/pmap: pmap.c pmap_segtab.c pmap_tlb.c

Log Message:
pmap: move userland xtab activate/deactivate into pmap_md_asid{,de}activate

pmap_segtab_{,de}activate() no longer calls pmap_md_xtab_{,de}activate()

Instead move the calls into
    - pmap_tlb_asid_acquire()
    - pmap_tlb_asid_deactivate()

respectively.

Rename xtab to asid at the same time so that the functions are now named
pmap_md_asid_{,de}activate(), and are provided as static inline to improve
code size.

On arm32 and aarch64 TTBR0 is disabled for the entire time that a userland
process in not pmap_activate()ed and only ever enabled if a userland
process is pmap_activate()ed. This results in less twiddling of the disable
bit, and no speculation window there incorrect TTBR0 walks can occur.

The last part makes GENERIC64_PMAPMI stable on Fusion on an M4 laptop.


To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 src/sys/arch/aarch64/aarch64/aarch64_tlb.c
cvs rdiff -u -r1.153 -r1.154 src/sys/arch/aarch64/aarch64/pmap.c
cvs rdiff -u -r1.12 -r1.13 src/sys/arch/aarch64/aarch64/pmap_machdep.c
cvs rdiff -u -r1.59 -r1.60 src/sys/arch/aarch64/include/pmap.h
cvs rdiff -u -r1.11 -r1.12 src/sys/arch/aarch64/include/pmap_machdep.h
cvs rdiff -u -r1.15 -r1.16 src/sys/arch/arm/arm32/arm32_tlb.c
cvs rdiff -u -r1.447 -r1.448 src/sys/arch/arm/arm32/pmap.c
cvs rdiff -u -r1.178 -r1.179 src/sys/arch/arm/include/arm32/pmap.h
cvs rdiff -u -r1.7 -r1.8 src/sys/arch/m68k/include/pmap_coldfire.h
cvs rdiff -u -r1.78 -r1.79 src/sys/arch/mips/include/pmap.h
cvs rdiff -u -r1.25 -r1.26 src/sys/arch/powerpc/include/booke/pmap.h
cvs rdiff -u -r1.27 -r1.28 src/sys/arch/riscv/include/pmap.h
cvs rdiff -u -r1.25 -r1.26 src/sys/arch/riscv/riscv/pmap_machdep.c
cvs rdiff -u -r1.88 -r1.89 src/sys/uvm/pmap/pmap.c
cvs rdiff -u -r1.34 -r1.35 src/sys/uvm/pmap/pmap_segtab.c
cvs rdiff -u -r1.66 -r1.67 src/sys/uvm/pmap/pmap_tlb.c

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