include/asm-ia64/sn/mspec.h

   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) 2001-2004 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_t _MUST_ be placed in either the first or second half
  41  * of the cache line.  The cache line _MUST NOT_ be used for anything
  42  * other than additional AMO_t 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_t 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 typedef struct {
  52         u64 variable;
  53         u64 unused[7];
  54 } AMO_t;
  55
  56
  57 #endif /* __KERNEL__ */
  58
  59 #endif /* _ASM_IA64_SN_MSPEC_H */