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Diffstat (limited to 'lib/isc/sparc64/include/isc/atomic.h')
| -rw-r--r-- | lib/isc/sparc64/include/isc/atomic.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/lib/isc/sparc64/include/isc/atomic.h b/lib/isc/sparc64/include/isc/atomic.h new file mode 100644 index 0000000..5533ddb --- /dev/null +++ b/lib/isc/sparc64/include/isc/atomic.h @@ -0,0 +1,127 @@ +/* + * Copyright (C) 2005, 2007 Internet Systems Consortium, Inc. ("ISC") + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: atomic.h,v 1.5 2007/06/19 23:47:18 tbox Exp $ */ + +/* + * This code was written based on FreeBSD's kernel source whose copyright + * follows: + */ + +/*- + * Copyright (c) 1998 Doug Rabson. + * Copyright (c) 2001 Jake Burkholder. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * from: FreeBSD: src/sys/i386/include/atomic.h,v 1.20 2001/02/11 + * $FreeBSD: src/sys/sparc64/include/atomic.h,v 1.8 2004/05/22 00:52:16 marius Exp $ + */ + +#ifndef ISC_ATOMIC_H +#define ISC_ATOMIC_H 1 + +#include <isc/platform.h> +#include <isc/types.h> + +#define ASI_P 0x80 /* Primary Address Space Identifier */ + +#ifdef ISC_PLATFORM_USEGCCASM + +/* + * This routine atomically increments the value stored in 'p' by 'val', and + * returns the previous value. + */ +static inline isc_int32_t +isc_atomic_xadd(isc_int32_t *p, isc_int32_t val) { + isc_int32_t prev, swapped; + + for (prev = *(volatile isc_int32_t *)p; ; prev = swapped) { + swapped = prev + val; + __asm__ volatile( + "casa [%1] %2, %3, %0" + : "+r"(swapped) + : "r"(p), "n"(ASI_P), "r"(prev)); + if (swapped == prev) + break; + } + + return (prev); +} + +/* + * This routine atomically stores the value 'val' in 'p'. + */ +static inline void +isc_atomic_store(isc_int32_t *p, isc_int32_t val) { + isc_int32_t prev, swapped; + + for (prev = *(volatile isc_int32_t *)p; ; prev = swapped) { + swapped = val; + __asm__ volatile( + "casa [%1] %2, %3, %0" + : "+r"(swapped) + : "r"(p), "n"(ASI_P), "r"(prev) + : "memory"); + if (swapped == prev) + break; + } +} + +/* + * This routine atomically replaces the value in 'p' with 'val', if the + * original value is equal to 'cmpval'. The original value is returned in any + * case. + */ +static inline isc_int32_t +isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val) { + isc_int32_t temp = val; + + __asm__ volatile( + "casa [%1] %2, %3, %0" + : "+r"(temp) + : "r"(p), "n"(ASI_P), "r"(cmpval)); + + return (temp); +} + +#else /* ISC_PLATFORM_USEGCCASM */ + +#error "unsupported compiler. disable atomic ops by --disable-atomic" + +#endif /* ISC_PLATFORM_USEGCCASM */ + +#endif /* ISC_ATOMIC_H */ |