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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sun, 23 May 2010 02:31:37 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/powerpc/aim ofw_machdep.c
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nwhitehorn    2010-05-23 02:31:37 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/powerpc/aim      ofw_machdep.c 
  Log:
  SVN rev 208429 on 2010-05-23 02:31:37Z by nwhitehorn
  
  MFC r205497,208364,208405:
  
  Fix a long-standing bug in the PowerPC OFW call function on SMP machines
  by forcing all secondary CPUs into a busy wait with interrupts off during
  the call. This bug caused ofwdump -a to hang the system.
  
  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.
  
  Revision  Changes    Path
  1.24.2.4  +57 -4     src/sys/powerpc/aim/ofw_machdep.c