1 files changed, 85 insertions, 0 deletions
diff --git a/include/asm-ia64/sn/fetchop.h b/include/asm-ia64/sn/fetchop.h
new file mode 100644
index 0000000..5f4ad8f
--- /dev/null
+++ b/include/asm-ia64/sn/fetchop.h
@@ -0,0 +1,85 @@
+/*
+ *
+ * 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) 2001-2004 Silicon Graphics, Inc.  All rights reserved.
+ */
+
+#ifndef _ASM_IA64_SN_FETCHOP_H
+#define _ASM_IA64_SN_FETCHOP_H
+
+#include <linux/config.h>
+
+#define FETCHOP_BASENAME	"sgi_fetchop"
+#define FETCHOP_FULLNAME	"/dev/sgi_fetchop"
+
+
+
+#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__
+
+/*
+ * Convert a region 6 (kaddr) address to the address of the fetchop variable
+ */
+#define FETCHOP_KADDR_TO_MSPEC_ADDR(kaddr)	TO_MSPEC(kaddr)
+
+
+/*
+ * 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_t _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_t 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_t 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.
+ */
+typedef struct {
+        u64 variable;
+        u64 unused[7];
+} AMO_t;
+
+
+/*
+ * The following APIs are externalized to the kernel to allocate/free pages of
+ * fetchop variables.
+ *	fetchop_kalloc_page	- Allocate/initialize 1 fetchop page on the
+ *				  specified cnode. 
+ *	fetchop_kfree_page	- Free a previously allocated fetchop page
+ */
+
+unsigned long fetchop_kalloc_page(int nid);
+void fetchop_kfree_page(unsigned long maddr);
+
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_SN_FETCHOP_H */
+