release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/sn/kernel/sn2/cache.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2001-2003, 2006 Silicon Graphics, Inc. All rights reserved.
   7  *
   8  */
   9 #include <linux/module.h>
  10 #include <asm/pgalloc.h>
  11 #include <asm/sn/arch.h>
  12
  13 /**
  14  * sn_flush_all_caches - flush a range of address from all caches (incl. L4)
  15  * @flush_addr: identity mapped region 7 address to start flushing
  16  * @bytes: number of bytes to flush
  17  *
  18  * Flush a range of addresses from all caches including L4.
  19  * All addresses fully or partially contained within
  20  * @flush_addr to @flush_addr + @bytes are flushed
  21  * from all caches.
  22  */
  23 void
  24 sn_flush_all_caches(long flush_addr, long bytes)
  25 {
  26         unsigned long addr = flush_addr;
  27
  28         /* SHub1 requires a cached address */
  29         if (is_shub1() && (addr & RGN_BITS) == RGN_BASE(RGN_UNCACHED))
  30                 addr = (addr - RGN_BASE(RGN_UNCACHED)) + RGN_BASE(RGN_KERNEL);
  31
  32         flush_icache_range(addr, addr + bytes);
  33         /*
  34          * The last call may have returned before the caches
  35          * were actually flushed, so we call it again to make
  36          * sure.
  37          */
  38         flush_icache_range(addr, addr + bytes);
  39         mb();
  40 }
  41 EXPORT_SYMBOL(sn_flush_all_caches);