RtlpCSparseBitmapPageCommit

NTSTATUS __fastcall RtlpCSparseBitmapPageCommit(INT64 a4, UINT64 a2, INT64 *a3, _OWORD *r9_0){
  unsigned __int64 v5; 
  unsigned __int64 v7; 
  int v9; 
  int v11; 
  INT64 v12; 
  UINT64 v13; 
  INT64 v14; 
  INT64 v15; 
  INT64 v16; 
  INT64 v17; 
  INT64 v18[2]; 
  UINT8 v19[16]; 
  __int64 v20; 
  INT64 v21; 
  VOID *CompareAddress; 

  CompareAddress = (VOID *)a2;
  v5 = a2 >> 15;
  v7 = a2;
  if( !_bittest64((const signed __int64 *)(a4 + 56), a2 >> 15) )
  {
    LODWORD(v17) = 0;
    v21 = 4096i64;
    v18[0] = *(_QWORD *)a4 + (v5 << 12);
    LODWORD(v15) = *(unsigned __int8 *)(a4 + 50);
    LODWORD(v14) = *(unsigned __int8 *)(a4 + 49);
    LODWORD(v13) = 4;
    v9 = RtlpHpEnvAllocVA(v18, &v21, 0i64, 1073745920i64, v13, v14, v15, v16, v17);
    if( v9 < 0 )
      return v9;
    _interlockedbittestandset64((volatile signed __int32 *)(a4 + 56), v5);
    v7 = (unsigned __int64)CompareAddress;
  }
  *r9_0 = *(_OWORD *)RtlCSparseBitmapEnterLockingRegion(&v20, a4);
  while( 1 )
  {
    RtlpCSparseBitmapLock(a4, 0, (__int64)a3);
    if( *(_QWORD *)(a4 + 32) != v7 )
      break;
    RtlpCSparseBitmapUnlock(a3);
    RtlpCSparseBitmapWaitOnAddress((VOID *)(a4 + 32), &CompareAddress, v12, a4);
  }
  if( !_bittest64(*(const signed __int64 **)a4, v7) )
  {
    v11 = *(unsigned __int8 *)(a4 + 49);
    LODWORD(v17) = 0;
    v18[0] = *(_QWORD *)(a4 + 8) + (v7 << 12);
    LODWORD(v15) = *(unsigned __int8 *)(a4 + 50);
    LODWORD(v14) = v11;
    v21 = 4096i64;
    LODWORD(v13) = 4;
    v9 = RtlpHpEnvAllocVA(v18, &v21, 0i64, 1073745920i64, v13, v14, v15, v16, v17);
    if( v9 < 0 )
    {
      RtlpCSparseBitmapUnlock(a3);
      *(_OWORD *)v19 = *r9_0;
      RtlCSparseBitmapLeaveLockingRegion(v19);
      return v9;
    }
    _interlockedbittestandset64(*(volatile signed __int32 **)a4, v7);
  }
  return 0;
}

Referenced by: