arch/ia64/include/asm/sn/clksupport.h

   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) 2000-2004 Silicon Graphics, Inc. All rights reserved.
   7  */
   8
   9 /*
  10  * This file contains definitions for accessing a platform supported high resolution
  11  * clock. The clock is monitonically increasing and can be accessed from any node
  12  * in the system. The clock is synchronized across nodes - all nodes see the
  13  * same value.
  14  *
  15  *      RTC_COUNTER_ADDR - contains the address of the counter
  16  *
  17  */
  18
  19 #ifndef _ASM_IA64_SN_CLKSUPPORT_H
  20 #define _ASM_IA64_SN_CLKSUPPORT_H
  21
  22 extern unsigned long sn_rtc_cycles_per_second;
  23
  24 #define RTC_COUNTER_ADDR        ((long *)LOCAL_MMR_ADDR(SH_RTC))
  25
  26 #define rtc_time()              (*RTC_COUNTER_ADDR)
  27
  28 #endif /* _ASM_IA64_SN_CLKSUPPORT_H */