RtlpHpFixedVsAllocate

VOID __fastcall RtlpHpFixedVsAllocate(UINT64 a1, UINT64 a2, CHAR a3, _DWORD *a4, _DWORD *a5){
  unsigned __int64 v5; 
  UINT64 v6; 
  int v8; 
  UINT8 v9; 
  __m128i v10; 
  UINT64 v11; 
  UINT8 v12; 
  int LongestRunClear; 
  _ETHREAD *CurrentThread; 
  unsigned int SessionId; 
  char v16; 
  int v17; 
  bool v18; 
  __int64 v19; 
  unsigned __int64 v20; 
  __int64 v21; 
  __int64 v22[3]; 
  UINT64 StartingIndex; 
  int v24; 
  int v25; 
  _DWORD *v26; 
  v26 = a4;
  v5 = (unsigned int)a2;
  v6 = a1 + 24;
  v8 = a3 & 1;
  if( (a3 & 1) != 0 )
    v9 = -1;
  else
    v9 = RtlpHpAcquireLockExclusive((INT64 *)(a1 + 24), *(unsigned int *)(a1 + 32));
  v10 = *(__m128i *)(a1 + 48);
  v22[0] = *(_QWORD *)(a1 + 48);
  v22[1] = a1 ^ _mm_srli_si128(v10, 8).m128i_u64[0];
  StartingIndex = RtlFindClearBitsAndSetEx((UINT64 *)v22, v5 >> 12, 0i64);
  if( StartingIndex == -1i64 )
  {
    LongestRunClear = RtlFindLongestRunClearEx((_RTL_BITMAP_EX *)v22, &StartingIndex, v11, v12);
    *a5 = LongestRunClear << 12;
  }
  else
  {
    *a5 = 0;
    *v26 = 0;
  }
  if( !v8 )
  {
    if( *(_DWORD *)(a1 + 32) )
    {
      ExReleaseSpinLockExclusiveFromDpcLevel((INT64 *)v6);
      __writecr8(v9);
    }
    else
    {
      if( (_InterlockedExchangeAdd64((volatile signed __int64 *)v6, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
        ExfTryToWakePushLock((volatile INT64 *)v6);
      v25 = 0;
      CurrentThread = (_ETHREAD *)KeGetCurrentThread();
      if( (unsigned int)MiGetSystemRegionType(v6) == 1 )
        SessionId = MmGetSessionIdEx(*((_QWORD *)CurrentThread + 23));
      else
        SessionId = -1;
      --*((_WORD *)CurrentThread + 243);
      v16 = ++*((_BYTE *)CurrentThread + 794);
      v17 = (*((char *)CurrentThread + 792) | *((char *)CurrentThread + 870)) ^ 0x3F;
      while( 1 )
      {
        v18 = !_BitScanReverse((unsigned int *)&v19, v17);
        v24 = v19;
        if( v18 )
          goto LABEL_17;
        v20 = *((_QWORD *)CurrentThread + 100) + 96 * v19;
        v17 &= ~(1 << v19);
        if( (*(_BYTE *)(v20 + 26) & 1) != 0
          && (*(_DWORD *)(v20 + 32) & 1) == 0
          && (*(_QWORD *)(v20 + 32) & 0x7FFFFFFFFFFFFFFCi64) == (v6 & 0x7FFFFFFFFFFFFFFCi64)
          && *(_DWORD *)(v20 + 40) == SessionId )
        {
          *(_BYTE *)(v20 + 26) &= ~1u;
          if( *(_QWORD *)(v20 + 32) )
            break;
        }
      }
      if( !v20 )
      {
LABEL_17:
        if( (*((_DWORD *)CurrentThread + 30) & 0x10000) == 0 )
          KeBugCheckEx(0x162u, (ULONG_PTR)CurrentThread, v6, SessionId, 0i64);
        goto LABEL_29;
      }
      *(_BYTE *)(v20 + 32) |= 2u;
      if( *(__int64 *)(v20 + 32) < 0 )
        KiAbEntryRemoveFromTree(v20);
      v25 = *(_DWORD *)(v20 + 88) & 0x1FFFF;
      *(_DWORD *)(v20 + 88) &= 0xFFFE0000;
      *(_BYTE *)(v20 + 25) &= ~1u;
      *(_QWORD *)(v20 + 32) = 0i64;
      v21 = (__int64)(v20 - *((_QWORD *)CurrentThread + 100)) / 96;
      if( v16 == 1 )
        *((_BYTE *)CurrentThread + 792) |= 1 << v21;
      else
        _InterlockedOr8((volatile signed __int8 *)CurrentThread + 870, 1 << v21);
LABEL_29:
      --*((_BYTE *)CurrentThread + 794);
      KiAbThreadRemoveBoosts((ULONG_PTR)CurrentThread, v6, (unsigned int *)&v25);
      v18 = (*((_WORD *)CurrentThread + 243))++ == 0xFFFF;
      if( v18 && *((_ETHREAD **)CurrentThread + 19) != (_ETHREAD *)((char *)CurrentThread + 152) )
        KiCheckForKernelApcDelivery();
      KiLeaveGuardedRegionUnsafe((__int64)KeGetCurrentThread());
    }
  }
}

Referenced by: