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sys/x86/linux/linux_vdso_gettc_x86.inc
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/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> | |||||
* Copyright (c) 2016, 2017, 2019 The FreeBSD Foundation | |||||
* Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org> | |||||
* | |||||
* Portions of this software were developed by Konstantin Belousov | |||||
* under sponsorship from the FreeBSD Foundation. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. Redistributions in binary form must reproduce the above copyright | |||||
* notice, this list of conditions and the following disclaimer in the | |||||
* documentation and/or other materials provided with the distribution. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
#include <sys/param.h> | |||||
#if defined(__i386__) || defined(COMPAT_LINUX32) | |||||
#include <i386/include/atomic.h> | |||||
#include <i386/include/cpufunc.h> | |||||
#else | |||||
#include <amd64/include/atomic.h> | |||||
#include <amd64/include/cpufunc.h> | |||||
#endif | |||||
static inline u_int | |||||
rdtsc_low(const struct vdso_timehands *th) | |||||
{ | |||||
u_int rv; | |||||
__asm __volatile("rdtsc; shrd %%cl, %%edx, %0" | |||||
: "=a" (rv) : "c" (th->th_x86_shift) : "edx"); | |||||
return (rv); | |||||
} | |||||
static inline u_int | |||||
rdtscp_low(const struct vdso_timehands *th) | |||||
{ | |||||
u_int rv; | |||||
__asm __volatile("rdtscp; movl %%edi,%%ecx; shrd %%cl, %%edx, %0" | |||||
: "=a" (rv) : "D" (th->th_x86_shift) : "ecx", "edx"); | |||||
return (rv); | |||||
} | |||||
static u_int | |||||
rdtsc_low_mb_lfence(const struct vdso_timehands *th) | |||||
{ | |||||
lfence(); | |||||
return (rdtsc_low(th)); | |||||
} | |||||
static u_int | |||||
rdtsc_low_mb_mfence(const struct vdso_timehands *th) | |||||
{ | |||||
mfence(); | |||||
return (rdtsc_low(th)); | |||||
} | |||||
static u_int | |||||
rdtsc_low_mb_none(const struct vdso_timehands *th) | |||||
{ | |||||
return (rdtsc_low(th)); | |||||
} | |||||
static u_int | |||||
rdtsc32_mb_lfence(void) | |||||
{ | |||||
lfence(); | |||||
return (rdtsc32()); | |||||
} | |||||
static u_int | |||||
rdtsc32_mb_mfence(void) | |||||
{ | |||||
mfence(); | |||||
return (rdtsc32()); | |||||
} | |||||
static u_int | |||||
rdtsc32_mb_none(void) | |||||
{ | |||||
return (rdtsc32()); | |||||
} | |||||
static u_int | |||||
rdtscp32_(void) | |||||
{ | |||||
return (rdtscp32()); | |||||
} | |||||
struct tsc_selector_tag { | |||||
u_int (*ts_rdtsc32)(void); | |||||
u_int (*ts_rdtsc_low)(const struct vdso_timehands *); | |||||
}; | |||||
static const struct tsc_selector_tag tsc_selector[] = { | |||||
[0] = { /* Intel, LFENCE */ | |||||
.ts_rdtsc32 = rdtsc32_mb_lfence, | |||||
.ts_rdtsc_low = rdtsc_low_mb_lfence, | |||||
}, | |||||
[1] = { /* AMD, MFENCE */ | |||||
.ts_rdtsc32 = rdtsc32_mb_mfence, | |||||
.ts_rdtsc_low = rdtsc_low_mb_mfence, | |||||
}, | |||||
[2] = { /* No SSE2 */ | |||||
.ts_rdtsc32 = rdtsc32_mb_none, | |||||
.ts_rdtsc_low = rdtsc_low_mb_none, | |||||
}, | |||||
[3] = { /* RDTSCP */ | |||||
.ts_rdtsc32 = rdtscp32_, | |||||
.ts_rdtsc_low = rdtscp_low, | |||||
}, | |||||
}; | |||||
static u_int | |||||
__vdso_gettc_rdtsc_low(const struct vdso_timehands *th) | |||||
{ | |||||
return (tsc_selector[kern_tsc_selector].ts_rdtsc_low(th)); | |||||
} | |||||
static u_int | |||||
__vdso_gettc_rdtsc32(void) | |||||
{ | |||||
return (tsc_selector[kern_tsc_selector].ts_rdtsc32()); | |||||
} | |||||
int | |||||
__vdso_gettc(const struct vdso_timehands *th, u_int *tc) | |||||
{ | |||||
switch (th->th_algo) { | |||||
case VDSO_TH_ALGO_X86_TSC: | |||||
*tc = th->th_x86_shift > 0 ? __vdso_gettc_rdtsc_low(th) : | |||||
__vdso_gettc_rdtsc32(); | |||||
return (0); | |||||
case VDSO_TH_ALGO_X86_HPET: | |||||
/* TODO */ | |||||
default: | |||||
return (ENOSYS); | |||||
} | |||||
} |