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