1 /* src/vm/jit/arm/atomic.hpp - ARM atomic instructions
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 #ifndef _MD_ATOMIC_HPP
27 #define _MD_ATOMIC_HPP
33 #include "threads/atomic.hpp"
35 /* Apparently, this is the best way to define a memory barrier on Linux.
36 * See for example: http://icedtea.classpath.org/hg/icedtea6/file/7c7835fceadc/ports/hotspot/src/os_cpu/linux_zero/vm/orderAccess_linux_zero.inline.hpp#l29
38 typedef void (__kernel_dmb_t)(void);
39 #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
44 * An atomic compare and swap for 32-bit integer values.
46 * @param p Pointer to memory address.
47 * @param oldval Old value to be expected.
48 * @param newval New value to be stored.
50 * @return value of the memory location before the store
52 inline uint32_t compare_and_swap(volatile uint32_t *p, uint32_t oldval, uint32_t newval)
54 return __sync_val_compare_and_swap(p, oldval, newval);
59 * An atomic compare and swap for 64-bit integer values.
61 * @param p Pointer to memory address.
62 * @param oldval Old value to be expected.
63 * @param newval New value to be stored.
65 * @return value of the memory location before the store
67 inline uint64_t compare_and_swap(volatile uint64_t *p, uint64_t oldval, uint64_t newval)
69 return Atomic::generic_compare_and_swap(p, oldval, newval);
76 inline void memory_barrier(void)
83 * A write memory barrier.
85 inline void write_memory_barrier(void)
92 * An instruction barrier.
94 inline void instruction_barrier(void)
96 __asm__ __volatile__ ("" : : : "memory");
101 #endif // _MD_ATOMIC_HPP
105 * These are local overrides for various environment variables in Emacs.
106 * Please do not remove this and leave it at the end of the file, where
107 * Emacs will automagically detect them.
108 * ---------------------------------------------------------------------
111 * indent-tabs-mode: t
115 * vim:noexpandtab:sw=4:ts=4: