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Mon, 28 Jun 2021 10:11:28 +0000 To: 'GNU C Library' Subject: [PATCH] AArch64: Add hp-timing.h Thread-Topic: [PATCH] AArch64: Add hp-timing.h Thread-Index: AQHXbAWY9l2T1LdHsES2JDT34KltXw== Date: Mon, 28 Jun 2021 10:11:28 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: Authentication-Results-Original: sourceware.org; dkim=none (message not signed) header.d=none;sourceware.org; dmarc=none action=none header.from=arm.com; x-originating-ip: [82.24.249.100] x-ms-publictraffictype: Email X-MS-Office365-Filtering-Correlation-Id: 36cf4c38-f05d-487e-eda3-08d93a1d2bf2 x-ms-traffictypediagnostic: VI1PR08MB4463:|AS8PR08MB6948: x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true x-ms-oob-tlc-oobclassifiers: OLM:3513;OLM:3513; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: JFqGxS5YJuBnlmHF9Ngtp8SEBI8xRPoBRK7yzbTuug2RPgBLrbigOQxKhniNVYiWCNI/WqJYiPIyluUucnwfNEihZJQF9MQuIdTvadSOD9eIxIRLtBuJpG+R7h/cB20XVpCtD0quhmZ+d7EHgbsbfMmp9FFggMk7g05EpoSsZIynfeOPCjxDLAjoWGuhw2tMVSA5ZkcHszNvITwPcUxIIJMqpRuC9RphCtzemXWVGWwHA4uAWk3QLaAptbUqYS3RBmBL5bPlh/3qdYdZbgzhTfQ0aZ+NiJrGWz76lDGsUcKsgFV9V8U/Q7zcJTdh80AOZJRQnl46r4J+F6zakj+WByqUFaZ9Y9UmBAeE3sNzmPyUdv19h+Dy4H0FtqC3vAqmM+1XU12zQu42Pc6mUGWOBqnshM/I0eUCX/upYoG40oFpP7pHYN2kWbhCRChIOrq2CZ+r6hYxr7xlLOGlK5ts/MB4POYkSrabddd2/HesB5Uc2gHJ0BWl0FCRE2Ioq8EyV1hlQpuTspvMYyw0GxWaa4QrjipcKT8HmuF6DJJFV8TjwOYcmBvDV6FJ4qajiwu83d/4Tv8fOk8Jc3vlmpiOKxleAVZb7U8fxnrvsvo9sS+mKShx+apFtTCRyjFYOa82/p2tk+kz44fGAuYy7WB3gQjYITibjCXHDR9DEdkZxOohrr2h/uADgd80JdLBud4Nkb9q/5fwP6BOyryUMZ6jBipEihLpuBxyZglsWJB7o3nlIYbnr4Fvmq0K4e+EGhTUFhwiT5SIN9DSAP3Z2X6jPg== X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255; 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Return timing in nanoseconds so it is fully compatible with generic hp-timing. Don't set HP_TIMING_INLINE in the dynamic linker since very old kernels may not handle cntcvt correctly. Reviewed-by: Szabolcs Nagy diff --git a/sysdeps/aarch64/hp-timing.h b/sysdeps/aarch64/hp-timing.h new file mode 100644 index 0000000000000000000000000000000000000000..f9822e725c227b3b57d508dc7d44cd7d2d04faf4 --- /dev/null +++ b/sysdeps/aarch64/hp-timing.h @@ -0,0 +1,47 @@ +/* High precision, low overhead timing functions. AArch64 version. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _HP_TIMING_H +#define _HP_TIMING_H 1 + +#include +#include +#include +#include + +/* Don't use inline timer in ld.so. */ +#if IS_IN(rtld) +# define HP_TIMING_INLINE (0) +#else +# define HP_TIMING_INLINE (1) +#endif + +typedef uint64_t hp_timing_t; + +#define HP_TIMING_NOW(var) \ + __asm__ __volatile__ ("isb; mrs %0, cntvct_el0" : "=r" (var)) + +/* Compute elapsed time in nanoseconds. */ +#undef HP_TIMING_DIFF +#define HP_TIMING_DIFF(Diff, Start, End) \ +({ hp_timing_t freq; \ + __asm__ __volatile__ ("mrs %0, cntfrq_el0" : "=r" (freq)); \ + (Diff) = ((End) - (Start)) * (UINT64_C(1000000000) / freq); \ +}) + +#endif /* hp-timing.h */