TAS
TCP Acceleration as an OS Service
include
utils_sync.h
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/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* spinlock implementation from DPDK (copied to remove dependencies on dpdk
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* includes everywhere) */
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#ifndef UTILS_SYNC_H_
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#define UTILS_SYNC_H_
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#include <stdint.h>
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static
inline
void
util_spin_lock(
volatile
uint32_t *sl)
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{
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uint32_t lock_val = 1;
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asm
volatile
(
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"1:\n"
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"xchg %[locked], %[lv]\n"
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"test %[lv], %[lv]\n"
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"jz 3f\n"
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"2:\n"
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"pause\n"
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"cmpl $0, %[locked]\n"
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"jnz 2b\n"
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"jmp 1b\n"
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"3:\n"
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: [locked]
"=m"
(*sl), [lv]
"=q"
(lock_val)
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:
"[lv]"
(lock_val)
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:
"memory"
);
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}
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static
inline
void
util_spin_unlock(
volatile
uint32_t *sl)
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{
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uint32_t unlock_val = 0;
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asm
volatile
(
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"xchg %[locked], %[ulv]\n"
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: [locked]
"=m"
(*sl), [ulv]
"=q"
(unlock_val)
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:
"[ulv]"
(unlock_val)
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:
"memory"
);
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}
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static
inline
int
util_spin_trylock(
volatile
uint32_t *sl)
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{
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uint32_t lockval = 1;
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asm
volatile
(
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"xchg %[locked], %[lockval]"
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: [locked]
"=m"
(*sl), [lockval]
"=q"
(lockval)
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:
"[lockval]"
(lockval)
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:
"memory"
);
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return
lockval == 0;
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}
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#endif
/* ndef UTILS_SYNC_H_ */
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