From:	"Alexei A. Frounze" <dummy_addressee AT hotmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: CWSDPMR0: system crash on INVD
Date:	Wed, 28 Mar 2001 12:40:01 -0500
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"Clark L. Coleman" <clc5q AT cobra DOT cs DOT Virginia DOT EDU> wrote in message
news:99t5g6$m5r$1 AT murdoch DOT acc DOT Virginia DOT EDU...
>
> When using the CWSDPR0.EXE (via stubedit), there is a privileged
> instruction that still crashes my machine: "invd", which invalidates
> the caches but does not write back dirty lines to main memory (i.e. is
> used only when coherency is not an issue.) Switching to the "wbinvd"
> instruction gets rid of the problem.
>
> I.e.:
>
> __asm__ __volatile__ ("invd");
>
> from within my C code causes a DOS crash and reboot.

INVD is a PL#0 instruction and must be invoked only by a OS software, not
user applications.

For more info check out intel manuals (specifically:

Intel Architecture
Software Developer's
Manual
Volume 3:
System Programming
NOTE: The Intel Architecture Software Developer's Manual consists of
three volumes: Basic Architecture, Order Number 243190; Instruction Set
Reference, Order Number 243191; and the System Programming Guide,
Order Number 243192.

)

Good Luck
--
Alexei A. Frounze
alexfru [AT] chat [DOT] ru
http://alexfru.chat.ru
http://members.xoom.com/alexfru/
http://welcome.to/pmode/

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