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From: Peter Wemm <peter@FreeBSD.org>
Date: Thu, 8 May 2003 01:25:51 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/amd64/amd64 machdep.c trap.c
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peter       2003/05/08 01:25:51 PDT

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      machdep.c trap.c 
  Log:
  Oops.  Turn T_PAGEFLT back into an interrupt gate.  It is *critical*
  that interrupts be disabled and remain disabled until %cr2 is read.
  Otherwise we can preempt and another process can fault, and by the
  time we read %cr2, we see a different processes fault address.  This
  Greatly Confuses vm_fault() (to say the least).  The i386 port has
  got this marked as a bug workaround for a Cyrix CPU, which is what
  lead me astray.  Its actually necessary for preemption, regardless
  of whether Cyrix cpus had a bug or not.
  
  Revision  Changes    Path
  1.568     +1 -1      src/sys/amd64/amd64/machdep.c
  1.253     +9 -1      src/sys/amd64/amd64/trap.c