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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) 2001-2002 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__
/*
* Initialize a FETCHOP line. The argument should point to the beginning
* of the line.
* SN1 - region mask is in word 0, data in word 1
* SN2 - no region mask. Data in word 0
*/
#ifdef CONFIG_IA64_SGI_SN1
#define FETCHOP_INIT_LINE(p) *(p) = 0xffffffffffffffffUL
#elif CONFIG_IA64_SGI_SN2
#define FETCHOP_INIT_LINE(p)
#endif
/*
* Convert a region 7 (kaddr) address to the address of the fetchop variable
*/
#define FETCHOP_KADDR_TO_MSPEC_ADDR(kaddr) TO_MSPEC(kaddr)
/*
* Convert a page struct (page) address to the address of the first
* fetchop variable in the page
*/
#define FETCHOP_PAGE_TO_MSPEC_ADDR(page) FETCHOP_KADDR_TO_MSPEC_ADDR(__pa(page_address(page)))
/*
* 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 {
#ifdef CONFIG_IA64_SGI_SN1
u64 permissions;
#endif
u64 variable;
#ifdef CONFIG_IA64_SGI_SN1
u64 unused[6];
#else
u64 unused[7];
#endif
} AMO_t;
#endif /* __KERNEL__ */
#endif /* _ASM_IA64_SN_FETCHOP_H */
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