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Viewing changes to lib/include/vm_atomic.h

  • Committer: Bazaar Package Importer
  • Author(s): Daniel Baumann
  • Date: 2009-03-20 10:19:00 UTC
  • mfrom: (1.1.4 upstream) (2.4.3 squeeze)
  • Revision ID: james.westby@ubuntu.com-20090320101900-1o604camiubq2de8
Tags: 2009.03.18-154848-2
http://bugs.debian.org/520493
Correcting patch system depends (Closes: #520493).

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Lines of Context:
lib/include/vm_atomic.h
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AtomicEpilogue(void)
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{
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#ifdef ATOMIC_USE_FENCE
 
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#ifdef VMM
 
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      /* The monitor conditionally patches out the lfence when not needed.*/
 
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      /* Construct a MonitorPatchTextEntry in the .patchtext section. */
 
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   asm volatile ("1:\n\t"
 
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                 "lfence\n\t"
 
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                 "2:\n\t"
 
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                 ".pushsection .patchtext\n\t"
 
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#ifdef VMM32
 
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                 ".long 1b\n\t"
 
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                 ".long 0\n\t"
 
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                 ".long 2b\n\t"
 
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                 ".long 0\n\t"
 
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#else 
 
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                 ".quad 1b\n\t"
 
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                 ".quad 2b\n\t"
 
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#endif
 
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                 ".popsection\n\t" ::: "memory");
 
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#else
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   if (UNLIKELY(AtomicUseFence)) {
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      asm volatile ("lfence" ::: "memory");
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   }
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#endif
 
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#endif
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}
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#endif
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#ifdef VMKERNEL
 
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/*
 
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 *-----------------------------------------------------------------------------
 
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 *
 
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 * CMPXCHG1B --
 
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 *
 
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 *      Compare and exchange a single byte.
 
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 *
 
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 * Results:
 
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 *      The value read from ptr.
 
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 *
 
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 * Side effects:
 
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 *      None
 
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 *
 
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 *-----------------------------------------------------------------------------
 
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 */
 
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static INLINE uint8
 
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CMPXCHG1B(volatile uint8 *ptr, // IN
 
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          uint8 oldVal,        // IN
 
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          uint8 newVal)        // IN
 
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{
 
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   uint8 val;
 
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   __asm__ __volatile__("lock; cmpxchgb %b2, %1"
 
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                        : "=a" (val),
 
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                          "+m" (*ptr)
 
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                        : "r" (newVal),
 
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                          "0" (oldVal)
 
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                        : "cc");
 
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   return val;
 
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}
 
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#endif
 
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/*
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 * Usage of this helper struct is strictly reserved to the following
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 * function. --hpreg