[src/riastradh-drm2]: src/sys/external/bsd/drm2/include/asm Implement Linux m...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ced780fe4c63
branches:  riastradh-drm2
changeset: 788029:ced780fe4c63
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Wed Jul 24 01:54:57 2013 +0000

description:
Implement Linux memory barriers in <asm/barrier.h>.

diffstat:

 sys/external/bsd/drm2/include/asm/barrier.h |  59 +++++++++++++++++++++++++++++
 1 files changed, 59 insertions(+), 0 deletions(-)

diffs (63 lines):

diff -r 394b9f4bc8e4 -r ced780fe4c63 sys/external/bsd/drm2/include/asm/barrier.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/external/bsd/drm2/include/asm/barrier.h       Wed Jul 24 01:54:57 2013 +0000
@@ -0,0 +1,59 @@
+/*     $NetBSD: barrier.h,v 1.1.2.1 2013/07/24 01:54:57 riastradh Exp $        */
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Taylor R. Campbell.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#ifndef _ASM_BARRIER_H_
+#define _ASM_BARRIER_H_
+
+#include <sys/atomic.h>
+
+#define        mb      membar_sync
+#define        wmb     membar_producer
+#define        rmb     membar_consumer
+
+#ifdef __alpha__               /* XXX As if...  */
+#  define      read_barrier_depends    membar_sync
+#else
+#  define      read_barrier_depends()  do {} while (0)
+#endif
+
+#ifdef MULTIPROCESSOR
+#  define      smp_mb                          mb
+#  define      smp_wmb                         wmb
+#  define      smp_rmb                         rmb
+#  define      smp_read_barrier_depends        read_barrier_depends
+#else
+#  define      smp_mb()                        do {} while (0)
+#  define      smp_wmb()                       do {} while (0)
+#  define      smp_rmb()                       do {} while (0)
+#  define      smp_read_barrier_depends()      do {} while (0)
+#endif
+
+#endif  /* _ASM_BARRIER_H_ */