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) 2001-2003 Silicon Graphics, Inc. All rights reserved. 8 */ 9 10 #ifndef _ASM_IA64_SN_FETCHOP_H 11 #define _ASM_IA64_SN_FETCHOP_H 12 13 #include <linux/config.h> 14 15 #define FETCHOP_BASENAME "sgi_fetchop" 16 #define FETCHOP_FULLNAME "/dev/sgi_fetchop" 17 18 19 20 #define FETCHOP_VAR_SIZE 64 /* 64 byte per fetchop variable */ 21 22 #define FETCHOP_LOAD 0 23 #define FETCHOP_INCREMENT 8 24 #define FETCHOP_DECREMENT 16 25 #define FETCHOP_CLEAR 24 26 27 #define FETCHOP_STORE 0 28 #define FETCHOP_AND 24 29 #define FETCHOP_OR 32 30 31 #define FETCHOP_CLEAR_CACHE 56 32 33 #define FETCHOP_LOAD_OP(addr, op) ( \ 34 *(volatile long *)((char*) (addr) + (op))) 35 36 #define FETCHOP_STORE_OP(addr, op, x) ( \ 37 *(volatile long *)((char*) (addr) + (op)) = (long) (x)) 38 39 #ifdef __KERNEL__ 40 41 /* 42 * Convert a region 6 (kaddr) address to the address of the fetchop variable 43 */ 44 #define FETCHOP_KADDR_TO_MSPEC_ADDR(kaddr) TO_MSPEC(kaddr) 45 46 47 /* 48 * Each Atomic Memory Operation (AMO formerly known as fetchop) 49 * variable is 64 bytes long. The first 8 bytes are used. The 50 * remaining 56 bytes are unaddressable due to the operation taking 51 * that portion of the address. 52 * 53 * NOTE: The AMO_t _MUST_ be placed in either the first or second half 54 * of the cache line. The cache line _MUST NOT_ be used for anything 55 * other than additional AMO_t entries. This is because there are two 56 * addresses which reference the same physical cache line. One will 57 * be a cached entry with the memory type bits all set. This address 58 * may be loaded into processor cache. The AMO_t will be referenced 59 * uncached via the memory special memory type. If any portion of the 60 * cached cache-line is modified, when that line is flushed, it will 61 * overwrite the uncached value in physical memory and lead to 62 * inconsistency. 63 */ 64 typedef struct { 65 u64 variable; 66 u64 unused[7]; 67 } AMO_t; 68 69 70 /* 71 * The following APIs are externalized to the kernel to allocate/free pages of 72 * fetchop variables. 73 * fetchop_kalloc_page - Allocate/initialize 1 fetchop page on the 74 * specified cnode. 75 * fetchop_kfree_page - Free a previously allocated fetchop page 76 */ 77 78 unsigned long fetchop_kalloc_page(int nid); 79 void fetchop_kfree_page(unsigned long maddr); 80 81 82 #endif /* __KERNEL__ */ 83 84 #endif /* _ASM_IA64_SN_FETCHOP_H */ 85 86