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1010
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1 /*
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2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * Copyright 2007, 2008, 2009 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 #ifdef ARM
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27
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28 /*
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29 * ARM Kernel helper for memory barrier.
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30 * Using __asm __volatile ("":::"memory") does not work reliable on ARM
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31 * and gcc __sync_synchronize(); implementation does not use the kernel
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32 * helper for all gcc versions so it is unreliable to use as well.
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33 */
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34 typedef void (__kernel_dmb_t) (void);
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35 #define __kernel_dmb (*(__kernel_dmb_t *) 0xffff0fa0)
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36
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37 #define FULL_MEM_BARRIER __kernel_dmb()
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38 #define READ_MEM_BARRIER __kernel_dmb()
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39 #define WRITE_MEM_BARRIER __kernel_dmb()
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40
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41 #else // ARM
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42
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43 #define FULL_MEM_BARRIER __sync_synchronize()
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44
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45 #ifdef PPC
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46
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47 #define READ_MEM_BARRIER __asm __volatile ("isync":::"memory")
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48 #ifdef __NO_LWSYNC__
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49 #define WRITE_MEM_BARRIER __asm __volatile ("sync":::"memory")
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50 #else
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51 #define WRITE_MEM_BARRIER __asm __volatile ("lwsync":::"memory")
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52 #endif
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53
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54 #else // PPC
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55
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56 #define READ_MEM_BARRIER __asm __volatile ("":::"memory")
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57 #define WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
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58
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59 #endif // PPC
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60
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61 #endif // ARM
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62
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63
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64 inline void OrderAccess::loadload() { acquire(); }
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65 inline void OrderAccess::storestore() { release(); }
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66 inline void OrderAccess::loadstore() { acquire(); }
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67 inline void OrderAccess::storeload() { fence(); }
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68
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69 inline void OrderAccess::acquire() {
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70 READ_MEM_BARRIER;
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71 }
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72
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73 inline void OrderAccess::release() {
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74 WRITE_MEM_BARRIER;
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75 }
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76
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77 inline void OrderAccess::fence() {
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78 FULL_MEM_BARRIER;
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79 }
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80
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81 inline jbyte OrderAccess::load_acquire(volatile jbyte* p) { jbyte data = *p; acquire(); return data; }
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82 inline jshort OrderAccess::load_acquire(volatile jshort* p) { jshort data = *p; acquire(); return data; }
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83 inline jint OrderAccess::load_acquire(volatile jint* p) { jint data = *p; acquire(); return data; }
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84 inline jlong OrderAccess::load_acquire(volatile jlong* p) {
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85 jlong tmp;
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86 os::atomic_copy64(p, &tmp);
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87 acquire();
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88 return tmp;
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89 }
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90 inline jubyte OrderAccess::load_acquire(volatile jubyte* p) { jubyte data = *p; acquire(); return data; }
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91 inline jushort OrderAccess::load_acquire(volatile jushort* p) { jushort data = *p; acquire(); return data; }
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92 inline juint OrderAccess::load_acquire(volatile juint* p) { juint data = *p; acquire(); return data; }
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93 inline julong OrderAccess::load_acquire(volatile julong* p) {
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94 julong tmp;
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95 os::atomic_copy64(p, &tmp);
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96 acquire();
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97 return tmp;
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98 }
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99 inline jfloat OrderAccess::load_acquire(volatile jfloat* p) { jfloat data = *p; acquire(); return data; }
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100 inline jdouble OrderAccess::load_acquire(volatile jdouble* p) {
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101 jdouble tmp;
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102 os::atomic_copy64(p, &tmp);
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103 acquire();
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104 return tmp;
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105 }
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106
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107 inline intptr_t OrderAccess::load_ptr_acquire(volatile intptr_t* p) {
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108 intptr_t data = *p;
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109 acquire();
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110 return data;
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111 }
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112 inline void* OrderAccess::load_ptr_acquire(volatile void* p) {
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113 void *data = *(void* volatile *)p;
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114 acquire();
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115 return data;
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116 }
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117 inline void* OrderAccess::load_ptr_acquire(const volatile void* p) {
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118 void *data = *(void* const volatile *)p;
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119 acquire();
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120 return data;
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121 }
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122
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123 inline void OrderAccess::release_store(volatile jbyte* p, jbyte v) { release(); *p = v; }
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124 inline void OrderAccess::release_store(volatile jshort* p, jshort v) { release(); *p = v; }
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125 inline void OrderAccess::release_store(volatile jint* p, jint v) { release(); *p = v; }
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126 inline void OrderAccess::release_store(volatile jlong* p, jlong v)
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127 { release(); os::atomic_copy64(&v, p); }
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128 inline void OrderAccess::release_store(volatile jubyte* p, jubyte v) { release(); *p = v; }
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129 inline void OrderAccess::release_store(volatile jushort* p, jushort v) { release(); *p = v; }
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130 inline void OrderAccess::release_store(volatile juint* p, juint v) { release(); *p = v; }
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131 inline void OrderAccess::release_store(volatile julong* p, julong v)
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132 { release(); os::atomic_copy64(&v, p); }
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133 inline void OrderAccess::release_store(volatile jfloat* p, jfloat v) { release(); *p = v; }
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134 inline void OrderAccess::release_store(volatile jdouble* p, jdouble v)
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135 { release(); os::atomic_copy64(&v, p); }
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136
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137 inline void OrderAccess::release_store_ptr(volatile intptr_t* p, intptr_t v) { release(); *p = v; }
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138 inline void OrderAccess::release_store_ptr(volatile void* p, void* v)
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139 { release(); *(void* volatile *)p = v; }
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140
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141 inline void OrderAccess::store_fence(jbyte* p, jbyte v) { *p = v; fence(); }
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142 inline void OrderAccess::store_fence(jshort* p, jshort v) { *p = v; fence(); }
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143 inline void OrderAccess::store_fence(jint* p, jint v) { *p = v; fence(); }
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144 inline void OrderAccess::store_fence(jlong* p, jlong v) { os::atomic_copy64(&v, p); fence(); }
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145 inline void OrderAccess::store_fence(jubyte* p, jubyte v) { *p = v; fence(); }
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146 inline void OrderAccess::store_fence(jushort* p, jushort v) { *p = v; fence(); }
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147 inline void OrderAccess::store_fence(juint* p, juint v) { *p = v; fence(); }
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148 inline void OrderAccess::store_fence(julong* p, julong v) { os::atomic_copy64(&v, p); fence(); }
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149 inline void OrderAccess::store_fence(jfloat* p, jfloat v) { *p = v; fence(); }
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150 inline void OrderAccess::store_fence(jdouble* p, jdouble v) { os::atomic_copy64(&v, p); fence(); }
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151
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152 inline void OrderAccess::store_ptr_fence(intptr_t* p, intptr_t v) { *p = v; fence(); }
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153 inline void OrderAccess::store_ptr_fence(void** p, void* v) { *p = v; fence(); }
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154
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155 inline void OrderAccess::release_store_fence(volatile jbyte* p, jbyte v) { release_store(p, v); fence(); }
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156 inline void OrderAccess::release_store_fence(volatile jshort* p, jshort v) { release_store(p, v); fence(); }
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157 inline void OrderAccess::release_store_fence(volatile jint* p, jint v) { release_store(p, v); fence(); }
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158 inline void OrderAccess::release_store_fence(volatile jlong* p, jlong v) { release_store(p, v); fence(); }
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159 inline void OrderAccess::release_store_fence(volatile jubyte* p, jubyte v) { release_store(p, v); fence(); }
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160 inline void OrderAccess::release_store_fence(volatile jushort* p, jushort v) { release_store(p, v); fence(); }
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161 inline void OrderAccess::release_store_fence(volatile juint* p, juint v) { release_store(p, v); fence(); }
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162 inline void OrderAccess::release_store_fence(volatile julong* p, julong v) { release_store(p, v); fence(); }
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163 inline void OrderAccess::release_store_fence(volatile jfloat* p, jfloat v) { release_store(p, v); fence(); }
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164 inline void OrderAccess::release_store_fence(volatile jdouble* p, jdouble v) { release_store(p, v); fence(); }
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165
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166 inline void OrderAccess::release_store_ptr_fence(volatile intptr_t* p, intptr_t v) { release_store_ptr(p, v); fence(); }
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167 inline void OrderAccess::release_store_ptr_fence(volatile void* p, void* v) { release_store_ptr(p, v); fence(); }
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