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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) 2001-2003 Silicon Graphics, Inc. All rights reserved.
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*/
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#ifndef _ASM_IA64_SN_FETCHOP_H
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#define _ASM_IA64_SN_FETCHOP_H
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#include <linux/config.h>
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#define FETCHOP_BASENAME "sgi_fetchop"
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#define FETCHOP_FULLNAME "/dev/sgi_fetchop"
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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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* Convert a region 6 (kaddr) address to the address of the fetchop variable
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*/
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#define FETCHOP_KADDR_TO_MSPEC_ADDR(kaddr) TO_MSPEC(kaddr)
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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_t _MUST_ be placed in either the first or second half
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* of the cache line. The cache line _MUST NOT_ be used for anything
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* other than additional AMO_t 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_t 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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typedef struct {
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u64 variable;
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u64 unused[7];
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} AMO_t;
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/*
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* The following APIs are externalized to the kernel to allocate/free pages of
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* fetchop variables.
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* fetchop_kalloc_page - Allocate/initialize 1 fetchop page on the
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* specified cnode.
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* fetchop_kfree_page - Free a previously allocated fetchop page
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*/
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unsigned long fetchop_kalloc_page(int nid);
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void fetchop_kfree_page(unsigned long maddr);
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#endif /* __KERNEL__ */
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#endif /* _ASM_IA64_SN_FETCHOP_H */
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