CVS commit: src/sys/arch

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

Module Name:    src
Committed By:   maxv
Date:           Sat Aug 12 06:46:13 UTC 2017

Modified Files:
        src/sys/arch/amd64/conf: ALL
        src/sys/arch/i386/conf: ALL GENERIC GENERIC_PS2TINY GENERIC_TINY
            INSTALL_FLOPPY INSTALL_TINY NET4501 XEN3_DOM0 XEN3_DOMU files.i386
Removed Files:
        src/sys/arch/i386/i386: vm86.c

Log Message:
Remove support for vm86 on i386. It is bug-friendly, and there is no point
in having kernel support for this: the instruction set of the CPU is small,
and it can easily be emulated in userland entirely. There are also several
assumptions in the code that are not respected, and the slightest confusion
in the trap frame can lead to ring0 exploits.

vm86 has received zero maintenance. As far as I can tell, it was added
20 years ago in order to make doscmd work. But doscmd has not been
maintained either, and was removed from pkgsrc in 2011. dosbox can be used
instead: it does not require kernel support, and will produce better
results than our flimsy implementation.

Pass 1. (many pieces still in the tree)


To generate a diff of this commit:
cvs rdiff -u -r1.65 -r1.66 src/sys/arch/amd64/conf/ALL
cvs rdiff -u -r1.425 -r1.426 src/sys/arch/i386/conf/ALL
cvs rdiff -u -r1.1164 -r1.1165 src/sys/arch/i386/conf/GENERIC
cvs rdiff -u -r1.77 -r1.78 src/sys/arch/i386/conf/GENERIC_PS2TINY
cvs rdiff -u -r1.154 -r1.155 src/sys/arch/i386/conf/GENERIC_TINY
cvs rdiff -u -r1.40 -r1.41 src/sys/arch/i386/conf/INSTALL_FLOPPY
cvs rdiff -u -r1.153 -r1.154 src/sys/arch/i386/conf/INSTALL_TINY
cvs rdiff -u -r1.97 -r1.98 src/sys/arch/i386/conf/NET4501
cvs rdiff -u -r1.120 -r1.121 src/sys/arch/i386/conf/XEN3_DOM0
cvs rdiff -u -r1.84 -r1.85 src/sys/arch/i386/conf/XEN3_DOMU
cvs rdiff -u -r1.384 -r1.385 src/sys/arch/i386/conf/files.i386
cvs rdiff -u -r1.51 -r0 src/sys/arch/i386/i386/vm86.c

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