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4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
152 lines
3.6 KiB
C++
152 lines
3.6 KiB
C++
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
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* Copyright (c) 2016, 2017, 2019 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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static inline u_int
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rdtsc_low(const struct vdso_timehands *th)
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{
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u_int rv;
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__asm __volatile("rdtsc; shrd %%cl, %%edx, %0"
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: "=a" (rv) : "c" (th->th_x86_shift) : "edx");
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return (rv);
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}
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static inline u_int
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rdtscp_low(const struct vdso_timehands *th)
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{
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u_int rv;
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__asm __volatile("rdtscp; movl %%edi,%%ecx; shrd %%cl, %%edx, %0"
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: "=a" (rv) : "D" (th->th_x86_shift) : "ecx", "edx");
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return (rv);
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}
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static u_int
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rdtsc_low_mb_lfence(const struct vdso_timehands *th)
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{
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lfence();
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return (rdtsc_low(th));
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}
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static u_int
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rdtsc_low_mb_mfence(const struct vdso_timehands *th)
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{
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mfence();
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return (rdtsc_low(th));
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}
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static u_int
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rdtsc_low_mb_none(const struct vdso_timehands *th)
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{
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return (rdtsc_low(th));
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}
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static u_int
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rdtsc32_mb_lfence(void)
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{
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lfence();
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return (rdtsc32());
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}
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static u_int
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rdtsc32_mb_mfence(void)
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{
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mfence();
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return (rdtsc32());
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}
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static u_int
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rdtsc32_mb_none(void)
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{
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return (rdtsc32());
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}
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static u_int
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rdtscp32_(void)
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{
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return (rdtscp32());
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}
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struct tsc_selector_tag {
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u_int (*ts_rdtsc32)(void);
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u_int (*ts_rdtsc_low)(const struct vdso_timehands *);
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};
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static const struct tsc_selector_tag tsc_selector[] = {
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[0] = { /* Intel, LFENCE */
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.ts_rdtsc32 = rdtsc32_mb_lfence,
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.ts_rdtsc_low = rdtsc_low_mb_lfence,
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},
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[1] = { /* AMD, MFENCE */
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.ts_rdtsc32 = rdtsc32_mb_mfence,
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.ts_rdtsc_low = rdtsc_low_mb_mfence,
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},
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[2] = { /* No SSE2 */
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.ts_rdtsc32 = rdtsc32_mb_none,
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.ts_rdtsc_low = rdtsc_low_mb_none,
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},
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[3] = { /* RDTSCP */
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.ts_rdtsc32 = rdtscp32_,
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.ts_rdtsc_low = rdtscp_low,
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},
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};
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static u_int
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__vdso_gettc_rdtsc_low(const struct vdso_timehands *th)
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{
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return (tsc_selector[kern_tsc_selector].ts_rdtsc_low(th));
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}
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static u_int
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__vdso_gettc_rdtsc32(void)
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{
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return (tsc_selector[kern_tsc_selector].ts_rdtsc32());
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}
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int
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__vdso_gettc(const struct vdso_timehands *th, u_int *tc)
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{
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switch (th->th_algo) {
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case VDSO_TH_ALGO_X86_TSC:
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*tc = th->th_x86_shift > 0 ? __vdso_gettc_rdtsc_low(th) :
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__vdso_gettc_rdtsc32();
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return (0);
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case VDSO_TH_ALGO_X86_HPET:
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/* TODO */
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default:
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return (ENOSYS);
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}
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}
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