1 /*
2 * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // Implementation of class atomic
27
28 #ifdef M68K
29
30 /*
31 * __m68k_cmpxchg
32 *
33 * Atomically store newval in *ptr if *ptr is equal to oldval for user space.
34 * Returns newval on success and oldval if no exchange happened.
35 * This implementation is processor specific and works on
36 * 68020 68030 68040 and 68060.
37 *
38 * It will not work on ColdFire, 68000 and 68010 since they lack the CAS
39 * instruction.
40 * Using a kernelhelper would be better for arch complete implementation.
41 *
42 */
43
44 static inline int __m68k_cmpxchg(int oldval, int newval, volatile int *ptr) {
45 int ret;
274 intptr_t compare_value) {
275 #ifdef ARM
276 return arm_compare_and_swap(dest, compare_value, exchange_value);
277 #else
278 #ifdef M68K
279 return m68k_compare_and_swap(dest, compare_value, exchange_value);
280 #else
281 return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
282 #endif // M68K
283 #endif // ARM
284 }
285
286 inline void* Atomic::cmpxchg_ptr(void* exchange_value,
287 volatile void* dest,
288 void* compare_value) {
289
290 return (void *) cmpxchg_ptr((intptr_t) exchange_value,
291 (volatile intptr_t*) dest,
292 (intptr_t) compare_value);
293 }
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1 /*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef OS_CPU_LINUX_ZERO_VM_ATOMIC_LINUX_ZERO_INLINE_HPP
27 #define OS_CPU_LINUX_ZERO_VM_ATOMIC_LINUX_ZERO_INLINE_HPP
28
29 #include "orderAccess_linux_zero.inline.hpp"
30 #include "runtime/atomic.hpp"
31 #include "runtime/os.hpp"
32 #include "vm_version_zero.hpp"
33
34 // Implementation of class atomic
35
36 #ifdef M68K
37
38 /*
39 * __m68k_cmpxchg
40 *
41 * Atomically store newval in *ptr if *ptr is equal to oldval for user space.
42 * Returns newval on success and oldval if no exchange happened.
43 * This implementation is processor specific and works on
44 * 68020 68030 68040 and 68060.
45 *
46 * It will not work on ColdFire, 68000 and 68010 since they lack the CAS
47 * instruction.
48 * Using a kernelhelper would be better for arch complete implementation.
49 *
50 */
51
52 static inline int __m68k_cmpxchg(int oldval, int newval, volatile int *ptr) {
53 int ret;
282 intptr_t compare_value) {
283 #ifdef ARM
284 return arm_compare_and_swap(dest, compare_value, exchange_value);
285 #else
286 #ifdef M68K
287 return m68k_compare_and_swap(dest, compare_value, exchange_value);
288 #else
289 return __sync_val_compare_and_swap(dest, compare_value, exchange_value);
290 #endif // M68K
291 #endif // ARM
292 }
293
294 inline void* Atomic::cmpxchg_ptr(void* exchange_value,
295 volatile void* dest,
296 void* compare_value) {
297
298 return (void *) cmpxchg_ptr((intptr_t) exchange_value,
299 (volatile intptr_t*) dest,
300 (intptr_t) compare_value);
301 }
302
303 #endif // OS_CPU_LINUX_ZERO_VM_ATOMIC_LINUX_ZERO_INLINE_HPP
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