69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 The FreeBSD Foundation
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* Copyright (c) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <x86/linux/linux_x86.h>
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static int
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__vdso_getcpu_rdpid(void)
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{
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register_t res;
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__asm("rdpid %0" : "=r" (res));
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return ((int)res);
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}
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static int
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__vdso_getcpu_rdtscp(void)
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{
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int res;
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__asm("rdtscp" : "=c" (res) : : "eax", "edx");
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return (res);
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}
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static int
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__vdso_getcpu_try(void)
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{
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int res;
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switch (kern_cpu_selector) {
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case LINUX_VDSO_CPU_RDTSCP:
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res = __vdso_getcpu_rdtscp();
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break;
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case LINUX_VDSO_CPU_RDPID:
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res = __vdso_getcpu_rdpid();
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break;
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default:
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res = -1;
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}
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return (res);
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}
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