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[NTOSKRNL] Implement ExAllocateCacheAwareRundownProtection() and ExFreeCacheAwareRundownProtection()

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This commit is contained in:
Pierre Schweitzer 2018-11-17 14:48:24 +01:00
parent cfff74daed
commit bc77f83888
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GPG key ID: 7545556C3D585B0B
1 changed files with 74 additions and 8 deletions
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82
ntoskrnl/ex/rundown.c
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@ -461,28 +461,94 @@ ExfReInitializeRundownProtectionCacheAware(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRef
}
/*
* @unimplemented NT5.2
* @implemented NT5.2
*/
PEX_RUNDOWN_REF_CACHE_AWARE
NTAPI
ExAllocateCacheAwareRundownProtection(IN POOL_TYPE PoolType,
IN ULONG Tag)
{
DBG_UNREFERENCED_PARAMETER(PoolType);
DBG_UNREFERENCED_PARAMETER(Tag);
UNIMPLEMENTED;
return NULL;
PVOID PoolToFree;
PEX_RUNDOWN_REF RunRef;
ULONG RunRefSize, Count, Offset;
PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware;
PAGED_CODE();
/* Allocate the master structure */
RunRefCacheAware = ExAllocatePoolWithTag(PoolType, sizeof(EX_RUNDOWN_REF_CACHE_AWARE), Tag);
if (RunRefCacheAware == NULL)
{
return NULL;
}
/* Compute the size of each runref */
RunRefCacheAware->Number = KeNumberProcessors;
if (KeNumberProcessors <= 1)
{
RunRefSize = sizeof(EX_RUNDOWN_REF);
}
else
{
RunRefSize = KeGetRecommendedSharedDataAlignment();
ASSERT((RunRefSize & (RunRefSize - 1)) == 0);
}
/* It must at least hold a EX_RUNDOWN_REF structure */
ASSERT(sizeof(EX_RUNDOWN_REF) <= RunRefSize);
RunRefCacheAware->RunRefSize = RunRefSize;
/* Allocate our runref pool */
PoolToFree = ExAllocatePoolWithTag(PoolType, RunRefSize * RunRefCacheAware->Number, Tag);
if (PoolToFree == NULL)
{
ExFreePoolWithTag(RunRefCacheAware, Tag);
return NULL;
}
/* On SMP, check for alignment */
if (RunRefCacheAware->Number > 1)
{
/* FIXME: properly align run refs */
UNIMPLEMENTED;
}
RunRefCacheAware->RunRefs = PoolToFree;
RunRefCacheAware->PoolToFree = PoolToFree;
/* And initialize runref */
if (RunRefCacheAware->Number != 0)
{
for (Count = 0; Count < RunRefCacheAware->Number; ++Count)
{
Offset = RunRefCacheAware->RunRefSize * Count;
RunRef = (PEX_RUNDOWN_REF)((ULONG_PTR)RunRefCacheAware->RunRefs + Offset);
RunRef->Count = 0;
}
}
return RunRefCacheAware;
}
/*
* @unimplemented NT5.2
* @implemented NT5.2
*/
VOID
NTAPI
ExFreeCacheAwareRundownProtection(IN PEX_RUNDOWN_REF_CACHE_AWARE RunRefCacheAware)
{
DBG_UNREFERENCED_PARAMETER(RunRefCacheAware);
UNIMPLEMENTED;
PAGED_CODE();
/*
* This is to be called for RunRefCacheAware that were allocated with
* ExAllocateCacheAwareRundownProtection and not for user-allocated
* ones
*/
ASSERT(RunRefCacheAware->PoolToFree != (PVOID)0xBADCA11);
/* We don't know the tag that as used for allocation */
ExFreePoolWithTag(RunRefCacheAware->PoolToFree, 0);
ExFreePoolWithTag(RunRefCacheAware, 0);
}
/*