1 /* High precision, low overhead timing functions. s390 version. 2 Copyright (C) 2019-2022 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 */ 43