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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Thu, 20 May 2010 21:07:58 +0000 (UTC)
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Subject: cvs commit: src/sys/powerpc/aim ofw_machdep.c
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nwhitehorn    2010-05-20 21:07:58 UTC

  FreeBSD src repository

  Modified files:
    sys/powerpc/aim      ofw_machdep.c 
  Log:
  SVN rev 208364 on 2010-05-20 21:07:58Z by nwhitehorn
  
  Fix a long-standing bug in the PowerPC OFW call function on SMP machines
  where running ofwdump could cause hangs by forcing all secondary CPUs
  into a busy wait with interrupts off during the call.
  
  Following section 8.4 of the Open Firmware PowerPC processor binding,
  the firmware is free to overwrite the system interrupt handlers during
  OF calls, restoring the OS handlers on exit. On single CPU systems, this
  process is invisible to the operating system. On multiple CPU systems,
  taking any exception on a secondary CPU while an OF call is in progress
  ends with that exception vectored into OF, resulting in a slow movement
  of the entire system into firmware context and a machine hang.
  
  MFC after:      3 days
  
  Revision  Changes    Path
  1.29      +64 -5     src/sys/powerpc/aim/ofw_machdep.c