1 files changed, 88 insertions, 0 deletions
diff --git a/lib/isc/ia64/include/isc/atomic.h b/lib/isc/ia64/include/isc/atomic.h
new file mode 100644
index 0000000..bfd32f4
--- /dev/null
+++ b/lib/isc/ia64/include/isc/atomic.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2006, 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 1.4 2007/06/19 23:47:17 tbox Exp $ */
+
+#ifndef ISC_ATOMIC_H
+#define ISC_ATOMIC_H 1
+
+#include <isc/platform.h>
+#include <isc/types.h>
+
+#ifdef ISC_PLATFORM_USEGCCASM
+/*
+ * This routine atomically increments the value stored in 'p' by 'val', and
+ * returns the previous value.
+ *
+ * Open issue: can 'fetchadd' make the code faster for some particular values
+ * (e.g., 1 and -1)?
+ */
+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(
+			"mov ar.ccv=%2;"
+			"cmpxchg4.acq %0=%4,%3,ar.ccv"
+			: "=r" (swapped), "=m" (*p)
+			: "r" (prev), "r" (swapped), "m" (*p)
+			: "memory");
+		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) {
+	__asm__ volatile(
+		"st4.rel %0=%1"
+		: "=m" (*p)
+		: "r" (val)
+		: "memory"
+		);
+}
+
+/*
+ * 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 ret;
+
+	__asm__ volatile(
+		"mov ar.ccv=%2;"
+		"cmpxchg4.acq %0=%4,%3,ar.ccv"
+		: "=r" (ret), "=m" (*p)
+		: "r" (cmpval), "r" (val), "m" (*p)
+		: "memory");
+
+	return (ret);
+}
+#else /* !ISC_PLATFORM_USEGCCASM */
+
+#error "unsupported compiler.  disable atomic ops by --disable-atomic"
+
+#endif
+#endif /* ISC_ATOMIC_H */