[Midnightbsd-cvs] src: atomic.h:

[laffer1 at midnightbsd.org]

Log Message:
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Added Files:
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    src/contrib/bind9/lib/isc/arm/include/isc:
        atomic.h (r1.1)

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+/*-
+ * Copyright (c) 2007 Warner Losh
+ * 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.
+ *
+ * $FreeBSD: src/contrib/bind9/lib/isc/arm/include/isc/atomic.h,v 1.1.1.1.2.1 2007/12/07 08:31:17 dougb Exp $
+ */
+
+#ifndef ISC_ATOMIC_H
+#define ISC_ATOMIC_H 1
+
+#include <isc/platform.h>
+#include <isc/types.h>
+#include <machine/atomic.h>
+
+#ifdef __FreeBSD__
+static inline isc_int32_t
+isc_atomic_xadd(isc_int32_t *p, isc_int32_t val)
+{
+	return atomic_fetchadd_int(p, val);
+}
+
+static inline void
+isc_atomic_store(isc_int32_t *p, isc_int32_t val)
+{
+	atomic_store_rel_int(p, val);
+}
+
+static inline isc_int32_t
+isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val)
+{
+	register int done, ras_start;
+
+	__asm __volatile("1:\n"
+	    "adr	%1, 1b\n"
+	    "mov	%0, #0xe0000004\n"
+	    "str	%1, [%0]\n"
+	    "mov	%0, #0xe0000008\n"
+	    "adr	%1, 2f\n"
+	    "str	%1, [%0]\n"
+	    "ldr	%1, [%2]\n"
+	    "cmp	%1, %3\n"
+	    "streq	%4, [%2]\n"
+	    "2:\n"
+	    "mov	%3, #0\n"
+	    "mov	%0, #0xe0000004\n"
+	    "str	%3, [%0]\n"
+	    "mov	%3, #0xffffffff\n"
+	    "mov	%0, #0xe0000008\n"
+	    "str	%3, [%0]\n"
+	    : "=r" (ras_start), "=r" (done)
+	    ,"+r" (p), "+r" (cmpval), "+r" (val) : : "memory");
+	return (done);
+
+}
+#else /* !FreeBSD */
+
+#error "unsupported compiler.  disable atomic ops by --disable-atomic"
+
+#endif
+#endif /* ISC_ATOMIC_H */