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[NTOSKRNL] Implement ExfAcquireRundownProtectionCacheAware(), ExfReleaseRundownProtectionCacheAware()

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This commit is contained in:
Pierre Schweitzer 2018-11-17 15:25:26 +01:00
parent 47d309b262
commit 7e36e76d5d
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GPG key ID: 7545556C3D585B0B
1 changed files with 46 additions and 7 deletions
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53
ntoskrnl/ex/rundown.c
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@ -378,15 +378,35 @@ ExfWaitForRundownProtectionRelease(IN PEX_RUNDOWN_REF RunRef)
/* FIXME: STUBS **************************************************************/ /* FIXME: STUBS **************************************************************/
/* /*
* @unimplemented NT5.2 * @implemented NT5.2
*/ */
BOOLEAN BOOLEAN
FASTCALL FASTCALL
ExfAcquireRundownProtectionCacheAware(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware) ExfAcquireRundownProtectionCacheAware(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware)
{ {
DBG_UNREFERENCED_PARAMETER(RunRefCacheAware); ULONG Value;
UNIMPLEMENTED; BOOLEAN Acquired;
return FALSE; PEX_RUNDOWN_REF RunRef;
RunRef = (PEX_RUNDOWN_REF)((ULONG_PTR)RunRefCacheAware->RunRefs +
RunRefCacheAware->RunRefSize *
(KeGetCurrentProcessorNumber() % RunRefCacheAware->Number));
/* Get current value */
Value = RunRef->Count & !EX_RUNDOWN_ACTIVE;
/* Try to acquire the quick way if already active */
if (ExpChangeRundown(RunRef,
((RunRef->Count & !EX_RUNDOWN_ACTIVE) + EX_RUNDOWN_COUNT_INC),
Value) == Value)
{
Acquired = 1;
}
else
{
Acquired = ExfAcquireRundownProtection(RunRef);
}
return Acquired;
} }
/* /*
@ -404,14 +424,33 @@ ExfAcquireRundownProtectionCacheAwareEx(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCac
} }
/* /*
* @unimplemented NT5.2 * @implemented NT5.2
*/ */
VOID VOID
FASTCALL FASTCALL
ExfReleaseRundownProtectionCacheAware(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware) ExfReleaseRundownProtectionCacheAware(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware)
{ {
DBG_UNREFERENCED_PARAMETER(RunRefCacheAware); ULONG Value;
UNIMPLEMENTED; PEX_RUNDOWN_REF RunRef;
RunRef = (PEX_RUNDOWN_REF)((ULONG_PTR)RunRefCacheAware->RunRefs +
RunRefCacheAware->RunRefSize *
(KeGetCurrentProcessorNumber() % RunRefCacheAware->Number));
/* Get current value */
Value = RunRef->Count & !EX_RUNDOWN_ACTIVE;
/* Try to release the quick way if multiple actived */
if (ExpChangeRundown(RunRef,
((RunRef->Count & !EX_RUNDOWN_ACTIVE) - EX_RUNDOWN_COUNT_INC),
Value) == Value)
{
/* Sanity check */
ASSERT((Value >= EX_RUNDOWN_COUNT_INC) || (KeNumberProcessors > 1));
}
else
{
ExfReleaseRundownProtection(RunRef);
}
} }
/* /*