/*

 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

// Processor dependent parts of ThreadLocalStorage

private:

  static Thread* _get_thread_cache[];  // index by [(raw_id>>9)^(raw_id>>20) % _pd_cache_size]

  static Thread* get_thread_via_cache_slowly(uintptr_t raw_id, int index);

  NOT_PRODUCT(static int _tcacheHit;)

  NOT_PRODUCT(static int _tcacheMiss;)

public:

  // Cache hit/miss statistics

  static void print_statistics() PRODUCT_RETURN;

  enum Constants {

#ifdef AMD64

    _pd_cache_size         =  256*2   // projected typical # of threads * 2

#else

    _pd_cache_size         =  128*2   // projected typical # of threads * 2

#endif // AMD64

  };

  enum pd_tlsAccessMode {

     pd_tlsAccessUndefined      = -1,

     pd_tlsAccessSlow           = 0,

     pd_tlsAccessIndirect       = 1,

     pd_tlsAccessDirect         = 2

  } ;

  static void set_thread_in_slot (Thread *) ;

  static pd_tlsAccessMode pd_getTlsAccessMode () ;

  static ptrdiff_t pd_getTlsOffset () ;

  static uintptr_t pd_raw_thread_id() {

#ifdef _GNU_SOURCE

#ifdef AMD64

    uintptr_t rv;

    __asm__ __volatile__ ("movq %%fs:0, %0" : "=r"(rv));

    return rv;

#else

    return gs_thread();

#endif // AMD64

#else  //_GNU_SOURCE

    return _raw_thread_id();

#endif //_GNU_SOURCE

  }

  static int pd_cache_index(uintptr_t raw_id) {

    // Copied from the sparc version. Dave said it should also work fine

    // for solx86.

    int ix = (int) (((raw_id >> 9) ^ (raw_id >> 20)) % _pd_cache_size);

    return ix;

  }

  // Java Thread

  static inline Thread* thread();