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1 /*
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2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Processor dependent parts of ThreadLocalStorage
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26
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27 private:
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28 static Thread* _get_thread_cache[]; // index by [(raw_id>>9)^(raw_id>>20) % _pd_cache_size]
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29 static Thread* get_thread_via_cache_slowly(uintptr_t raw_id, int index);
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30
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31 NOT_PRODUCT(static int _tcacheHit;)
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32 NOT_PRODUCT(static int _tcacheMiss;)
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33
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34 public:
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35 // Cache hit/miss statistics
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36 static void print_statistics() PRODUCT_RETURN;
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37
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38 enum Constants {
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39 #ifdef AMD64
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40 _pd_cache_size = 256*2 // projected typical # of threads * 2
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41 #else
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42 _pd_cache_size = 128*2 // projected typical # of threads * 2
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43 #endif // AMD64
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44 };
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45
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46 enum pd_tlsAccessMode {
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47 pd_tlsAccessUndefined = -1,
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48 pd_tlsAccessSlow = 0,
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49 pd_tlsAccessIndirect = 1,
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50 pd_tlsAccessDirect = 2
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51 } ;
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52
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53 static void set_thread_in_slot (Thread *) ;
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54
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55 static pd_tlsAccessMode pd_getTlsAccessMode () ;
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56 static ptrdiff_t pd_getTlsOffset () ;
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57
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58 static uintptr_t pd_raw_thread_id() {
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59 #ifdef _GNU_SOURCE
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60 #ifdef AMD64
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61 uintptr_t rv;
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62 __asm__ __volatile__ ("movq %%fs:0, %0" : "=r"(rv));
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63 return rv;
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64 #else
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65 return gs_thread();
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66 #endif // AMD64
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67 #else //_GNU_SOURCE
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68 return _raw_thread_id();
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69 #endif //_GNU_SOURCE
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70 }
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71
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72 static int pd_cache_index(uintptr_t raw_id) {
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73 // Copied from the sparc version. Dave said it should also work fine
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74 // for solx86.
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75 int ix = (int) (((raw_id >> 9) ^ (raw_id >> 20)) % _pd_cache_size);
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76 return ix;
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77 }
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78
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79 // Java Thread
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80 static inline Thread* thread();
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