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