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* 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_CLEAR 24
#define FETCHOP_AND 24
#define FETCHOP_OR 32
#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 */