Date: Thu, 16 Jun 2011 01:52:42 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/atkbdc atkbd.c Message-ID: <201106160152.p5G1qsu5002878@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
delphij 2011-06-16 01:52:42 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_8)
sys/dev/atkbdc atkbd.c
Log:
SVN rev 223134 on 2011-06-16 01:52:42Z by delphij
MFC r222795 (jkim) + 222967:
Validate INT 15h and 16h vectors more strictly. Traditionally these entry
points are fixed addresses and (U)EFI CSM specification also mandated that.
Unfortunately, (U)EFI CSM specification does not specifically mention this
is to call service routine via interrupt vector table or to jump directly
to the entry point. As a result, some CSM seems to install two routines
and acts differently, depending on how it was executed, unfortunately.
When INT 15h is used, it calls a function pointer (which is probably a UEFI
service function). When it jumps directly to the entry point, it executes
a simple and traditional INT 15h service routine. Therefore, actually there
are two possible fixes, i. e., this fix or jumping directly to the fixed
entry point. However, we chose this fix because a) keyboard typematic
support via BIOS is becoming extremely rarer and b) we cannot support random
service routine installed by a firmware or a boot loader. This should fix
Lenovo X220 laptop, specifically.
Revision Changes Path
1.54.2.3 +11 -1 src/sys/dev/atkbdc/atkbd.c
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201106160152.p5G1qsu5002878>