/*
* Copyright (C) 2009 Bradley Smith <
[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "../all_atomic_load_store.h"
#include "../ordered.h" /* There are no multiprocessor implementations. */
#include "../test_and_set_t_is_ao_t.h"
#ifndef AO_PREFER_GENERALIZED
AO_INLINE AO_TS_VAL_t
AO_test_and_set_full(volatile AO_TS_t *addr)
{
register long ret;
__asm__ __volatile__(
"xchg %[oldval], %[mem], %[newval]"
: [oldval] "=&r"(ret)
: [mem] "r"(addr), [newval] "r"(1)
: "memory");
return (AO_TS_VAL_t)ret;
}
# define AO_HAVE_test_and_set_full
#endif /* !AO_PREFER_GENERALIZED */
AO_INLINE int
AO_compare_and_swap_full(volatile AO_t *addr, AO_t old, AO_t new_val)
{
register long ret;
__asm__ __volatile__(
"1: ssrf 5\n"
" ld.w %[res], %[mem]\n"
" eor %[res], %[oldval]\n"
" brne 2f\n"
" stcond %[mem], %[newval]\n"
" brne 1b\n"
"2:\n"
: [res] "=&r"(ret), [mem] "=m"(*addr)
: "m"(*addr), [newval] "r"(new_val), [oldval] "r"(old)
: "cc", "memory");
return (int)ret;
}
#define AO_HAVE_compare_and_swap_full
/* TODO: implement AO_fetch_compare_and_swap. */
#define AO_T_IS_INT
