1  /* High precision, low overhead timing functions.  s390 version.
       2     Copyright (C) 2019-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _HP_TIMING_S390_H
      20  #define _HP_TIMING_S390_H	1
      21  
      22  /* The stckf instruction is available starting with z9-109 zarch CPUs.
      23     As there is no extra configure check for z9-109, the z10 one is used.  */
      24  #ifdef HAVE_S390_MIN_Z10_ZARCH_ASM_SUPPORT
      25  # include <hp-timing-common.h>
      26  
      27  /* We use 64 bit values for the times.
      28     Note: Bit 51 is incremented every 0.000 001s = 1us.  */
      29  typedef unsigned long long int hp_timing_t;
      30  
      31  # define HP_TIMING_INLINE	(1)
      32  
      33  # define HP_TIMING_NOW(VAR)						\
      34    do {									\
      35      __asm__ __volatile__ ("stckf %0" : "=Q" (VAR) : : "cc");		\
      36    } while (0)
      37  
      38  #else
      39  # include_next <hp-timing.h>
      40  #endif
      41  
      42  #endif	/* hp-timing.h */