root/opal/include/opal/sys/ia32/timer.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. opal_sys_timer_get_cycles

   1 /*
   2  * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
   3  *                         University Research and Technology
   4  *                         Corporation.  All rights reserved.
   5  * Copyright (c) 2004-2014 The University of Tennessee and The University
   6  *                         of Tennessee Research Foundation.  All rights
   7  *                         reserved.
   8  * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
   9  *                         University of Stuttgart.  All rights reserved.
  10  * Copyright (c) 2004-2005 The Regents of the University of California.
  11  *                         All rights reserved.
  12  * $COPYRIGHT$
  13  *
  14  * Additional copyrights may follow
  15  *
  16  * $HEADER$
  17  */
  18 
  19 #ifndef OPAL_SYS_ARCH_TIMER_H
  20 #define OPAL_SYS_ARCH_TIMER_H 1
  21 
  22 
  23 typedef uint64_t opal_timer_t;
  24 
  25 /* Using RDTSC(P) results in non-monotonic timers across cores */
  26 #undef OPAL_TIMER_MONOTONIC
  27 #define OPAL_TIMER_MONOTONIC 0
  28 
  29 #if OPAL_GCC_INLINE_ASSEMBLY
  30 
  31 static inline opal_timer_t
  32 opal_sys_timer_get_cycles(void)
  33 {
  34     opal_timer_t ret;
  35     int tmp;
  36 
  37     __asm__ __volatile__(
  38                          "xchgl %%ebx, %1\n"
  39                          "cpuid\n"
  40                          "xchgl %%ebx, %1\n"
  41                          "rdtsc\n"
  42                          : "=A"(ret), "=r"(tmp)
  43                          :: "ecx");
  44 
  45     return ret;
  46 }
  47 
  48 #define OPAL_HAVE_SYS_TIMER_GET_CYCLES 1
  49 
  50 #else
  51 
  52 #define OPAL_HAVE_SYS_TIMER_GET_CYCLES 0
  53 
  54 #endif /* OPAL_GCC_INLINE_ASSEMBLY */
  55 
  56 #endif /* ! OPAL_SYS_ARCH_TIMER_H */

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