RtlpHpVsSubsegmentCommitPages

INT64 __fastcall RtlpHpVsSubsegmentCommitPages(INT64 a1, INT64 a2, UINT64 a3, UINT64 a4, INT64 a5){
  unsigned __int64 v6; 
  unsigned __int64 v7; 
  unsigned __int64 v9; 
  volatile signed __int64 *v10; 
  unsigned int v11; 
  __int64 v12; 
  INT64 v13; 
  UINT8 CurrentIrql; 
  UINT8 v15; 
  INT64 v16; 
  unsigned __int64 v17; 
  int v18; 
  _ETHREAD *v20; 
  unsigned int SessionId; 
  char v22; 
  int v23; 
  bool v24; 
  __int64 v25; 
  unsigned __int64 v26; 
  __int64 v27; 
  _ETHREAD *CurrentThread; 
  int v29; 
  UINT8 v30; 
  int v31; 
  v6 = (unsigned int)a4;
  _BitScanForward64(&v7, a3);
  _BitScanReverse64(&v9, a3);
  v10 = (volatile signed __int64 *)(a2 + 24);
  v29 = v9 - v7 + 1;
  v11 = v29 << 12;
  v12 = ((1i64 << v29) - 1) << v7;
  v13 = a2 + (unsigned int)((_DWORD)v7 << 12);
  if( *(_DWORD *)(a1 + 8) )
  {
    CurrentIrql = KeGetCurrentIrql();
    __writecr8(2ui64);
    ExpAcquireSpinLockExclusive((INT64 *)(a2 + 24), CurrentIrql);
    v15 = CurrentIrql;
    v11 = v29 << 12;
    v30 = v15;
  }
  else
  {
    CurrentThread = (_ETHREAD *)KeGetCurrentThread();
    v30 = 0;
    --*((_WORD *)CurrentThread + 243);
    ExAcquirePushLockExclusiveEx(a2 + 24, 0i64);
  }
  v16 = a1 ^ *(_QWORD *)(a1 + 128);
  if( !(_DWORD)a5 )
  {
    ((void(__fastcall *)(INT64, INT64, _QWORD))(a1 ^ RtlpHpHeapGlobals ^ *(_QWORD *)(a1 + 160)))(v16, v13, v11);
    *(_QWORD *)(a2 + 16) &= ~v12;
    v17 = -(int)v6;
LABEL_5:
    _InterlockedExchangeAdd64((volatile signed __int64 *)(a1 + 48), v17);
    v18 = 0;
    goto LABEL_6;
  }
  v18 = ((__int64(__fastcall *)(INT64, INT64, _QWORD))(a1 ^ RtlpHpHeapGlobals ^ *(_QWORD *)(a1 + 152)))(v16, v13, v11);
  if( v18 >= 0 )
  {
    *(_QWORD *)(a2 + 16) |= v12;
    v17 = v6;
    goto LABEL_5;
  }
LABEL_6:
  if( *(_DWORD *)(a1 + 8) )
  {
    *(_DWORD *)v10 = 0;
    __writecr8(v30);
  }
  else
  {
    if( (_InterlockedExchangeAdd64(v10, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
      ExfTryToWakePushLock((volatile INT64 *)(a2 + 24));
    v31 = 0;
    v20 = (_ETHREAD *)KeGetCurrentThread();
    if( (unsigned int)MiGetSystemRegionType(a2 + 24) == 1 )
      SessionId = MmGetSessionIdEx(*((_QWORD *)v20 + 23));
    else
      SessionId = -1;
    --*((_WORD *)v20 + 243);
    v22 = ++*((_BYTE *)v20 + 794);
    v23 = (*((char *)v20 + 792) | *((char *)v20 + 870)) ^ 0x3F;
    v24 = !_BitScanReverse((unsigned int *)&v25, v23);
    if( v24 )
      goto LABEL_31;
    while( 1 )
    {
      v26 = *((_QWORD *)v20 + 100) + 96 * v25;
      v23 &= ~(1 << v25);
      if( (*(_BYTE *)(v26 + 26) & 1) != 0
        && (*(_DWORD *)(v26 + 32) & 1) == 0
        && (*(_QWORD *)(v26 + 32) & 0x7FFFFFFFFFFFFFFCi64) == ((unsigned __int64)v10 & 0x7FFFFFFFFFFFFFFCi64)
        && *(_DWORD *)(v26 + 40) == SessionId )
      {
        *(_BYTE *)(v26 + 26) &= ~1u;
        if( *(_QWORD *)(v26 + 32) )
          break;
      }
      v24 = !_BitScanReverse((unsigned int *)&v25, v23);
      if( v24 )
        goto LABEL_31;
    }
    if( !v26 )
    {
LABEL_31:
      if( (*((_DWORD *)v20 + 30) & 0x10000) == 0 )
        KeBugCheckEx(0x162u, (ULONG_PTR)v20, a2 + 24, SessionId, 0i64);
    }
    else
    {
      *(_BYTE *)(v26 + 32) |= 2u;
      if( *(__int64 *)(v26 + 32) < 0 )
        KiAbEntryRemoveFromTree(v26);
      v31 = *(_DWORD *)(v26 + 88) & 0x1FFFF;
      *(_DWORD *)(v26 + 88) &= 0xFFFE0000;
      *(_BYTE *)(v26 + 25) &= ~1u;
      *(_QWORD *)(v26 + 32) = 0i64;
      v27 = (__int64)(v26 - *((_QWORD *)v20 + 100)) / 96;
      if( v22 == 1 )
        *((_BYTE *)v20 + 792) |= 1 << v27;
      else
        _InterlockedOr8((volatile signed __int8 *)v20 + 870, 1 << v27);
    }
    --*((_BYTE *)v20 + 794);
    KiAbThreadRemoveBoosts((ULONG_PTR)v20, a2 + 24, (unsigned int *)&v31);
    v24 = (*((_WORD *)v20 + 243))++ == 0xFFFF;
    if( v24 && *((_ETHREAD **)v20 + 19) != (_ETHREAD *)((char *)v20 + 152) )
      KiCheckForKernelApcDelivery();
    KiLeaveGuardedRegionUnsafe((__int64)KeGetCurrentThread());
  }
  return(unsigned int)v18;
}

Referenced by: