1 files changed, 59 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/sn/mspec.h b/arch/ia64/include/asm/sn/mspec.h
new file mode 100644
index 000000000000..c1d3c50c3223
--- /dev/null
+++ b/arch/ia64/include/asm/sn/mspec.h
@@ -0,0 +1,59 @@
+/*
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2001-2008 Silicon Graphics, Inc.  All rights reserved.
+ */
+
+#ifndef _ASM_IA64_SN_MSPEC_H
+#define _ASM_IA64_SN_MSPEC_H
+
+#define FETCHOP_VAR_SIZE 64 /* 64 byte per fetchop variable */
+
+#define FETCHOP_LOAD            0
+#define FETCHOP_INCREMENT       8
+#define FETCHOP_DECREMENT       16
+#define FETCHOP_CLEAR           24
+
+#define FETCHOP_STORE           0
+#define FETCHOP_AND             24
+#define FETCHOP_OR              32
+
+#define FETCHOP_CLEAR_CACHE     56
+
+#define FETCHOP_LOAD_OP(addr, op) ( \
+         *(volatile long *)((char*) (addr) + (op)))
+
+#define FETCHOP_STORE_OP(addr, op, x) ( \
+         *(volatile long *)((char*) (addr) + (op)) = (long) (x))
+
+#ifdef __KERNEL__
+
+/*
+ * Each Atomic Memory Operation (amo, formerly known as fetchop)
+ * variable is 64 bytes long.  The first 8 bytes are used.  The
+ * remaining 56 bytes are unaddressable due to the operation taking
+ * that portion of the address.
+ *
+ * NOTE: The amo structure _MUST_ be placed in either the first or second
+ * half of the cache line.  The cache line _MUST NOT_ be used for anything
+ * other than additional amo entries.  This is because there are two
+ * addresses which reference the same physical cache line.  One will
+ * be a cached entry with the memory type bits all set.  This address
+ * may be loaded into processor cache.  The amo will be referenced
+ * uncached via the memory special memory type.  If any portion of the
+ * cached cache-line is modified, when that line is flushed, it will
+ * overwrite the uncached value in physical memory and lead to
+ * inconsistency.
+ */
+struct amo {
+        u64 variable;
+        u64 unused[7];
+};
+
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_SN_MSPEC_H */