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9441de4c38
This release is used in conjunction with the linux-sgx-driver Intial release: https://github.com/01org/linux-sgx-driver commit-id: 0e865ce5e6b297a787bcdc12d98bada8174be6d7 Intel-id: 33399 Signed-off-by: Angie Chinchilla <angie.v.chinchilla@intel.com>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* Copyright (C) 2011-2016 Intel Corporation. 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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*/
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#include <sgx_spinlock.h>
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static inline void _mm_pause(void) __attribute__((always_inline));
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static inline int _InterlockedExchange(int volatile * dst, int val) __attribute__((always_inline));
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static inline void _mm_pause(void)
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{
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__asm __volatile(
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"pause"
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);
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}
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static inline int _InterlockedExchange(int volatile * dst, int val)
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{
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int res;
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__asm __volatile(
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"lock xchg %2, %1;"
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"mov %2, %0"
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: "=m" (res)
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: "m" (*dst),
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"r" (val)
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: "memory"
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);
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return (res);
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}
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uint32_t sgx_spin_lock(sgx_spinlock_t *lock)
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{
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while(_InterlockedExchange((volatile int *)lock, 1) != 0) {
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while (*lock) {
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/* tell cpu we are spinning */
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_mm_pause();
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}
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}
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return (0);
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}
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uint32_t sgx_spin_unlock(sgx_spinlock_t *lock)
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{
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*lock = 0;
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return (0);
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}
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