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From: Joseph Koshy <jkoshy@FreeBSD.org>
Date: Tue, 3 Feb 2009 09:01:45 +0000 (UTC)
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Subject: cvs commit: src/sys/amd64/amd64 exception.S machdep.c mp_machdep.c
 src/sys/amd64/include intr_machdep.h
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jkoshy      2009-02-03 09:01:45 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      exception.S machdep.c mp_machdep.c 
    sys/amd64/include    intr_machdep.h 
  Log:
  SVN rev 188065 on 2009-02-03 09:01:45Z by jkoshy
  
  Improve robustness of NMI handling, for NMIs recognized in kernel
  mode.
  
  - Make the NMI handler run on its own stack (TSS_IST2).
  - Store the GSBASE value for each CPU just before the start of
    each NMI stack, permitting efficient retrieval using %rsp-relative
    addressing.
  - For NMIs taken from kernel mode, program MSR_GSBASE explicitly
    since one or both of MSR_GSBASE and MSR_KGSBASE can be potentially
    invalid.  The current contents of MSR_GSBASE are saved and restored
    at exit.
  - For NMIs handled from user mode, continue to use 'swapgs' to
    load the per-CPU GSBASE.
  
  Reviewed by:    jeff
  Debugging help: jeff
  Tested by:      gnn, Artem Belevich <artemb at gmail dot com>
  
  Revision  Changes    Path
  1.137     +52 -25    src/sys/amd64/amd64/exception.S
  1.691     +13 -1     src/sys/amd64/amd64/machdep.c
  1.297     +10 -0     src/sys/amd64/amd64/mp_machdep.c
  1.21      +9 -0      src/sys/amd64/include/intr_machdep.h