mirror of
https://github.com/corda/corda.git
synced 2025-01-10 15:03:02 +00:00
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
*
|
||
|
|
* * Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* * Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in
|
||
|
|
* the documentation and/or other materials provided with the
|
||
|
|
* distribution.
|
||
|
|
* * Neither the name of Intel Corporation nor the names of its
|
||
|
|
* contributors may be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <sgx_spinlock.h>
|
||
|
|
|
||
|
|
static inline void _mm_pause(void) __attribute__((always_inline));
|
||
|
|
static inline int _InterlockedExchange(int volatile * dst, int val) __attribute__((always_inline));
|
||
|
|
|
||
|
|
static inline void _mm_pause(void)
|
||
|
|
{
|
||
|
|
__asm __volatile(
|
||
|
|
"pause"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int _InterlockedExchange(int volatile * dst, int val)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
|
||
|
|
__asm __volatile(
|
||
|
|
"lock xchg %2, %1;"
|
||
|
|
"mov %2, %0"
|
||
|
|
: "=m" (res)
|
||
|
|
: "m" (*dst),
|
||
|
|
"r" (val)
|
||
|
|
: "memory"
|
||
|
|
);
|
||
|
|
|
||
|
|
return (res);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t sgx_spin_lock(sgx_spinlock_t *lock)
|
||
|
|
{
|
||
|
|
while(_InterlockedExchange((volatile int *)lock, 1) != 0) {
|
||
|
|
while (*lock) {
|
||
|
|
/* tell cpu we are spinning */
|
||
|
|
_mm_pause();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t sgx_spin_unlock(sgx_spinlock_t *lock)
|
||
|
|
{
|
||
|
|
*lock = 0;
|
||
|
|
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|