CVS commit: src/sys/arch

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

Module Name:    src
Committed By:   maxv
Date:           Fri Apr 24 16:27:28 UTC 2020

Modified Files:
        src/sys/arch/amd64/amd64: netbsd32_machdep.c
        src/sys/arch/amd64/include: gdt.h
        src/sys/arch/i386/include: gdt.h
        src/sys/arch/x86/include: pmap.h
        src/sys/arch/x86/x86: pmap.c svs.c sys_machdep.c

Log Message:
Give the ldt a fixed size of one page (512 slots), and drop the variable-
sized mechanism that was too complex.

This fixes a race between USER_LDT and SVS: during context switches, the
way SVS installs the new ldt relies on the ldt pointer AND the ldt size,
but both cannot be accessed atomically at the same time.


To generate a diff of this commit:
cvs rdiff -u -r1.134 -r1.135 src/sys/arch/amd64/amd64/netbsd32_machdep.c
cvs rdiff -u -r1.10 -r1.11 src/sys/arch/amd64/include/gdt.h
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/i386/include/gdt.h
cvs rdiff -u -r1.117 -r1.118 src/sys/arch/x86/include/pmap.h
cvs rdiff -u -r1.381 -r1.382 src/sys/arch/x86/x86/pmap.c
cvs rdiff -u -r1.32 -r1.33 src/sys/arch/x86/x86/svs.c
cvs rdiff -u -r1.53 -r1.54 src/sys/arch/x86/x86/sys_machdep.c

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