CVS commit: src/sys/arch

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Thu Jul 26 09:29:08 UTC 2018

Modified Files:
        src/sys/arch/amd64/amd64: locore.S machdep.c netbsd32_machdep.c trap.c
        src/sys/arch/amd64/include: pcb.h userret.h
        src/sys/arch/i386/i386: locore.S machdep.c trap.c
        src/sys/arch/i386/include: pcb.h userret.h
        src/sys/arch/x86/include: dbregs.h
        src/sys/arch/x86/x86: dbregs.c vm_machdep.c

Log Message:
Rework dbregs, to switch the registers during context switches, and not on
each user->kernel transition via userret. Reloads of DR6/DR7 are expensive
on both native and xen.


To generate a diff of this commit:
cvs rdiff -u -r1.172 -r1.173 src/sys/arch/amd64/amd64/locore.S
cvs rdiff -u -r1.308 -r1.309 src/sys/arch/amd64/amd64/machdep.c
cvs rdiff -u -r1.115 -r1.116 src/sys/arch/amd64/amd64/netbsd32_machdep.c
cvs rdiff -u -r1.113 -r1.114 src/sys/arch/amd64/amd64/trap.c
cvs rdiff -u -r1.28 -r1.29 src/sys/arch/amd64/include/pcb.h
cvs rdiff -u -r1.12 -r1.13 src/sys/arch/amd64/include/userret.h
cvs rdiff -u -r1.159 -r1.160 src/sys/arch/i386/i386/locore.S
cvs rdiff -u -r1.807 -r1.808 src/sys/arch/i386/i386/machdep.c
cvs rdiff -u -r1.295 -r1.296 src/sys/arch/i386/i386/trap.c
cvs rdiff -u -r1.57 -r1.58 src/sys/arch/i386/include/pcb.h
cvs rdiff -u -r1.14 -r1.15 src/sys/arch/i386/include/userret.h
cvs rdiff -u -r1.5 -r1.6 src/sys/arch/x86/include/dbregs.h
cvs rdiff -u -r1.10 -r1.11 src/sys/arch/x86/x86/dbregs.c
cvs rdiff -u -r1.35 -r1.36 src/sys/arch/x86/x86/vm_machdep.c

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