1/*
 2 *
 3 * This file is subject to the terms and conditions of the GNU General Public
 4 * License.  See the file "COPYING" in the main directory of this archive
 5 * for more details.
 6 *
 7 * Copyright (c) 2001-2008 Silicon Graphics, Inc.  All rights reserved.
 8 */
 9
10#ifndef _ASM_IA64_SN_MSPEC_H
11#define _ASM_IA64_SN_MSPEC_H
12
13#define FETCHOP_VAR_SIZE 64 /* 64 byte per fetchop variable */
14
15#define FETCHOP_LOAD		0
16#define FETCHOP_INCREMENT	8
17#define FETCHOP_DECREMENT	16
18#define FETCHOP_CLEAR		24
19
20#define FETCHOP_STORE		0
21#define FETCHOP_AND		24
22#define FETCHOP_OR		32
23
24#define FETCHOP_CLEAR_CACHE	56
25
26#define FETCHOP_LOAD_OP(addr, op) ( \
27         *(volatile long *)((char*) (addr) + (op)))
28
29#define FETCHOP_STORE_OP(addr, op, x) ( \
30         *(volatile long *)((char*) (addr) + (op)) = (long) (x))
31
32#ifdef __KERNEL__
33
34/*
35 * Each Atomic Memory Operation (amo, formerly known as fetchop)
36 * variable is 64 bytes long.  The first 8 bytes are used.  The
37 * remaining 56 bytes are unaddressable due to the operation taking
38 * that portion of the address.
39 *
40 * NOTE: The amo structure _MUST_ be placed in either the first or second
41 * half of the cache line.  The cache line _MUST NOT_ be used for anything
42 * other than additional amo entries.  This is because there are two
43 * addresses which reference the same physical cache line.  One will
44 * be a cached entry with the memory type bits all set.  This address
45 * may be loaded into processor cache.  The amo will be referenced
46 * uncached via the memory special memory type.  If any portion of the
47 * cached cache-line is modified, when that line is flushed, it will
48 * overwrite the uncached value in physical memory and lead to
49 * inconsistency.
50 */
51struct amo {
52        u64 variable;
53        u64 unused[7];
54};
55
56
57#endif /* __KERNEL__ */
58
59#endif /* _ASM_IA64_SN_MSPEC_H */