HalpIommuBlockDevice

INT64 __fastcall HalpIommuBlockDevice(INT64 *a1){
  UINT8 v1; 
  INT64 result; 
  char v3; 
  ULONG *v5; 
  int AcpiDeviceMapping; 
  ULONG *v7; 
  __int64 v8; 
  int v9; 
  _ETHREAD *CurrentThread; 
  unsigned int SessionId; 
  char v12; 
  int v13; 
  bool v14; 
  __int64 v15; 
  unsigned __int64 v16; 
  int v17; 
  unsigned int v18; 
  __int64 v19; 
  ULONG SortKey[4]; 
  __int64 v21; 
  int v22; 
  __int64 a2; 
  a2 = 0i64;
  result = 0i64;
  v3 = 0;
  v21 = 0i64;
  *(_OWORD *)SortKey = 0i64;
  if( !a1 )
    return result;
  v5 = (ULONG *)a1[4];
  if( *v5 == 2 )
  {
    AcpiDeviceMapping = (unsigned int)HalpIommuQueryAcpiDeviceMapping((PKDEVICE_QUEUE)a1[4], (ULONG)SortKey);
    v7 = SortKey;
    if( AcpiDeviceMapping < 0 )
      v7 = v5;
    v5 = v7;
  }
  if( *v5 != 1 )
    goto LABEL_10;
  ExAcquirePushLockExclusiveEx((UINT64)&HalpDeviceBlockUnblockPushLock, 0i64);
  v3 = 1;
  v9 = HalpIommuDecreaseAliasTrack((INT64)v5, &a2);
  if( v9 < 0 )
    goto LABEL_10;
  if( *(__int64 *)(a2 + 24) <= 0 )
  {
    HalpMmAllocCtxFree(v8, *(_QWORD *)(a2 + 16));
LABEL_10:
    v9 = (unsigned int)HalpIommuLeaveDmaDomain((KDEVICE_QUEUE *)a1, HalpIommuBypassDomain, v1);
  }
  HalpIommuDeleteDevice((UINT64 *)a1);
  if( v3 )
  {
    if( (_InterlockedExchangeAdd64((volatile signed __int64 *)&HalpDeviceBlockUnblockPushLock, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
      ExfTryToWakePushLock((volatile INT64 *)&HalpDeviceBlockUnblockPushLock);
    v22 = 0;
    CurrentThread = (_ETHREAD *)KeGetCurrentThread();
    if( (unsigned int)MiGetSystemRegionType((UINT64)&HalpDeviceBlockUnblockPushLock) == 1 )
      SessionId = MmGetSessionIdEx(*((_QWORD *)CurrentThread + 23));
    else
      SessionId = -1;
    --*((_WORD *)CurrentThread + 243);
    v12 = ++*((_BYTE *)CurrentThread + 794);
    v13 = (*((char *)CurrentThread + 792) | *((char *)CurrentThread + 870)) ^ 0x3F;
    while( 1 )
    {
      v14 = !_BitScanReverse((unsigned int *)&v15, v13);
      if( v14 )
        break;
      v16 = *((_QWORD *)CurrentThread + 100) + 96 * v15;
      v13 &= ~(1 << v15);
      if( (*(_BYTE *)(v16 + 26) & 1) != 0
        && (*(_DWORD *)(v16 + 32) & 1) == 0
        && (*(_QWORD *)(v16 + 32) & 0x7FFFFFFFFFFFFFFCi64) == ((unsigned __int64)&HalpDeviceBlockUnblockPushLock & 0x7FFFFFFFFFFFFFFCi64)
        && *(_DWORD *)(v16 + 40) == SessionId )
      {
        *(_BYTE *)(v16 + 26) &= ~1u;
        if( *(_QWORD *)(v16 + 32) )
        {
          if( v16 )
          {
            *(_BYTE *)(v16 + 32) |= 2u;
            if( *(__int64 *)(v16 + 32) < 0 )
              KiAbEntryRemoveFromTree(v16);
            v17 = *(_DWORD *)(v16 + 88) & 0x1FFFF;
            v18 = *(_DWORD *)(v16 + 88) & 0xFFFE0000;
            *(_BYTE *)(v16 + 25) &= ~1u;
            v22 = v17;
            *(_DWORD *)(v16 + 88) = v18;
            *(_QWORD *)(v16 + 32) = 0i64;
            v19 = (__int64)(v16 - *((_QWORD *)CurrentThread + 100)) / 96;
            if( v12 == 1 )
              *((_BYTE *)CurrentThread + 792) |= 1 << v19;
            else
              _InterlockedOr8((volatile signed __int8 *)CurrentThread + 870, 1 << v19);
            goto LABEL_29;
          }
          break;
        }
      }
    }
    if( (*((_DWORD *)CurrentThread + 30) & 0x10000) == 0 )
      KeBugCheckEx(0x162u, (ULONG_PTR)CurrentThread, (ULONG_PTR)&HalpDeviceBlockUnblockPushLock, SessionId, 0i64);
LABEL_29:
    --*((_BYTE *)CurrentThread + 794);
    KiAbThreadRemoveBoosts((ULONG_PTR)CurrentThread, (__int64)&HalpDeviceBlockUnblockPushLock, (unsigned int *)&v22);
    v14 = (*((_WORD *)CurrentThread + 243))++ == 0xFFFF;
    if( v14 && *((_ETHREAD **)CurrentThread + 19) != (_ETHREAD *)((char *)CurrentThread + 152) )
      KiCheckForKernelApcDelivery();
  }
  return(unsigned int)v9;
}

Referenced by: