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 */ 51 struct amo { 52 u64 variable; 53 u64 unused[7]; 54 }; 55 56 57 #endif /* __KERNEL__ */ 58 59 #endif /* _ASM_IA64_SN_MSPEC_H */ 60