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