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68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*-
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* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
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* Copyright (c) 2016, 2017, 2019, 2021 The FreeBSD Foundation
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* Copyright (c) 2021 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 <sys/param.h>
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#include <x86/cputypes.h>
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#include <x86/x86_var.h>
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#include <x86/specialreg.h>
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#include <machine/cpufunc.h>
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#include <x86/linux/linux_x86.h>
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int
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linux_vdso_tsc_selector_idx(void)
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{
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bool amd_cpu;
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if (cpu_feature == 0)
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return (2); /* should not happen due to RDTSC */
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amd_cpu = (cpu_vendor_id == CPU_VENDOR_AMD ||
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cpu_vendor_id == CPU_VENDOR_HYGON);
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if ((amd_feature & AMDID_RDTSCP) != 0)
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return (3);
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if ((cpu_feature & CPUID_SSE2) == 0)
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return (2);
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return (amd_cpu ? 1 : 0);
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}
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int
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linux_vdso_cpu_selector_idx(void)
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{
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if ((cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0)
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return (LINUX_VDSO_CPU_RDPID);
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return ((amd_feature & AMDID_RDTSCP) == 0 ?
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LINUX_VDSO_CPU_DEFAULT : LINUX_VDSO_CPU_RDTSCP);
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}
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