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90 lines
3.3 KiB
90 lines
3.3 KiB
/*
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* Copyright (C) 2006 iptelorg GmbH
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* @file
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* @brief Memory barriers for SPARC32 ( version < v 9))
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*
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* Memory barriers for SPARC32 ( version < v 9)), see atomic_ops.h for more
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* details.
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*
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* Config defines:
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* - NOSMP
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* @ingroup atomic
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*/
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/*
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* History:
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* --------
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* 2006-03-28 created by andrei
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* 2007-05-29 added membar_depends(), membar_*_atomic_op and
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* membar_*_atomic_setget (andrei)
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*/
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#ifndef _atomic_sparc_h
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#define _atomic_sparc_h
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#define HAVE_ASM_INLINE_MEMBAR
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#warning "sparc32 atomic operations support not tested"
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#ifdef NOSMP
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#define membar() asm volatile ("" : : : "memory") /* gcc do not cache barrier*/
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#define membar_read() membar()
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#define membar_write() membar()
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#define membar_depends() do {} while(0) /* really empty, not even a cc bar. */
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/* lock barrriers: empty, not needed for NOSMP; the lock/unlock should already
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* contain gcc barriers*/
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#define membar_enter_lock() do {} while(0)
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#define membar_leave_lock() do {} while(0)
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/* membars after or before atomic_ops or atomic_setget -> use these or
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* mb_<atomic_op_name>() if you need a memory barrier in one of these
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* situations (on some archs where the atomic operations imply memory
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* barriers is better to use atomic_op_x(); membar_atomic_op() then
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* atomic_op_x(); membar()) */
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#define membar_atomic_op() membar()
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#define membar_atomic_setget() membar()
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#define membar_write_atomic_op() membar_write()
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#define membar_write_atomic_setget() membar_write()
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#define membar_read_atomic_op() membar_read()
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#define membar_read_atomic_setget() membar_read()
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#else /* SMP */
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#define membar_write() asm volatile ("stbar \n\t" : : : "memory")
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#define membar() membar_write()
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#define membar_read() asm volatile ("" : : : "memory")
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#define membar_depends() do {} while(0) /* really empty, not even a cc bar. */
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#define membar_enter_lock() do {} while(0)
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#define membar_leave_lock() asm volatile ("stbar \n\t" : : : "memory")
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/* membars after or before atomic_ops or atomic_setget -> use these or
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* mb_<atomic_op_name>() if you need a memory barrier in one of these
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* situations (on some archs where the atomic operations imply memory
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* barriers is better to use atomic_op_x(); membar_atomic_op() then
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* atomic_op_x(); membar()) */
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#define membar_atomic_op() membar()
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#define membar_atomic_setget() membar()
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#define membar_write_atomic_op() membar_write()
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#define membar_write_atomic_setget() membar_write()
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#define membar_read_atomic_op() membar_read()
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#define membar_read_atomic_setget() membar_read()
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#endif /* NOSMP */
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#endif
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