Re: [ros-dev] [ros-diffs] [sginsberg] 43958: - Fix the "fix" of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the custom Invalid Opcode handler
7 Nov
7 Nov
10:04 p.m.
New subject: [ros-diffs] [sginsberg] 43958: - Fix the "fix" of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the custom Invalid Opcode handler
Ok...so how does it crash? And where? Can I get a backtrace or something?
Date: Sat, 7 Nov 2009 22:30:05 +0300
From: d.g.gorbachev(a)gmail.com
To: ros-dev(a)reactos.org
Subject: Re: [ros-dev] [ros-diffs] [sginsberg] 43958: - Fix the "fix"
of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the
custom Invalid Opcode handler
Hi!
This change causes a crash when booting, on Pentium.
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8 Nov
8 Nov
9:13 p.m.
New subject: [ros-diffs] [sginsberg] 43958: - Fix the "fix" of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the custom Invalid Opcode handler
Ok...so how does it crash? And where? Can I get a
backtrace or something?
First time, HalpBiosDisplayReset() is called when booting, before
KiI386PentiumLockErrataFixup(). Recent changes cause a page to be
protected from writing. Then kernel tries to write to this page and
crashes. Another time, HalpBiosDisplayReset() is called when shutting
down; before r39959, crash happened to be there. From r39959 and
before r43958, write protection was established only in
KiI386PentiumLockErrataFixup().
It appears that a fix for a fix for a fix is now needed:)
9:46 p.m.
New subject: [ros-diffs] [sginsberg] 43958: - Fix the "fix" of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the custom Invalid Opcode handler
Should be fixed as of 44032.
Date: Mon, 9 Nov 2009 00:13:51 +0300
From: gorbachev(a)reactos.org
To: ros-dev(a)reactos.org
Subject: Re: [ros-dev] [ros-diffs] [sginsberg] 43958: - Fix the "fix"
of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the
custom Invalid Opcode handler
_________________________________________________________________
Keep your friends updated—even when you’re not signed in.
http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/so…
Ok...so how does it crash? And where? Can I get a
backtrace or something?
First time, HalpBiosDisplayReset() is called when booting, before
KiI386PentiumLockErrataFixup(). Recent changes cause a page to be
protected from writing. Then kernel tries to write to this page and
crashes. Another time, HalpBiosDisplayReset() is called when shutting
down; before r39959, crash happened to be there. From r39959 and
before r43958, write protection was established only in
KiI386PentiumLockErrataFixup().
It appears that a fix for a fix for a fix is now needed:)
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Ros-dev mailing list
Ros-dev(a)reactos.org
http://www.reactos.org/mailman/listinfo/ros-dev
10:30 p.m.
New subject: [ros-diffs] [sginsberg] 43958: - Fix the "fix" of un-protecting the 7 IDT entries on P5 in HAL's BIOS call code when setting the custom Invalid Opcode handler
Ok, it works. Thanks. :)
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4 comments
3 participants
participants (3)
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Dmitry Gorbachev -
Dmitry Gorbachev -
Stefan Ginsberg