/* * * 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) 2001-2004 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__ /* * Convert a region 6 (kaddr) address to the address of the fetchop variable */ #define FETCHOP_KADDR_TO_MSPEC_ADDR(kaddr) TO_MSPEC(kaddr) /* * 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 { u64 variable; u64 unused[7]; } AMO_t; /* * The following APIs are externalized to the kernel to allocate/free pages of * fetchop variables. * fetchop_kalloc_page - Allocate/initialize 1 fetchop page on the * specified cnode. * fetchop_kfree_page - Free a previously allocated fetchop page */ unsigned long fetchop_kalloc_page(int nid); void fetchop_kfree_page(unsigned long maddr); #endif /* __KERNEL__ */ #endif /* _ASM_IA64_SN_FETCHOP_H */