1 files changed, 0 insertions, 420 deletions
diff --git a/lib/libc/x86/sys/__vdso_gettc.c b/lib/libc/x86/sys/__vdso_gettc.c
deleted file mode 100644
index b3f3de9f4203..000000000000
--- a/lib/libc/x86/sys/__vdso_gettc.c
+++ /dev/null
@@ -1,420 +0,0 @@
-/*-
- * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
- * Copyright (c) 2016, 2017, 2019 The FreeBSD Foundation
- * All rights reserved.
- *
- * 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>
-#include "namespace.h"
-#include <sys/capsicum.h>
-#include <sys/elf.h>
-#include <sys/fcntl.h>
-#include <sys/mman.h>
-#include <sys/time.h>
-#include <sys/vdso.h>
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-#include "un-namespace.h"
-#include <machine/atomic.h>
-#include <machine/cpufunc.h>
-#include <machine/pvclock.h>
-#include <machine/specialreg.h>
-#include <dev/acpica/acpi_hpet.h>
-#ifdef WANT_HYPERV
-#include <dev/hyperv/hyperv.h>
-#endif
-#include <x86/ifunc.h>
-#include "libc_private.h"
-
-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 int
-tsc_selector_idx(u_int cpu_feature)
-{
-	u_int amd_feature, cpu_exthigh, p[4], v[3];
-	static const char amd_id[] = "AuthenticAMD";
-	static const char hygon_id[] = "HygonGenuine";
-	bool amd_cpu;
-
-	if (cpu_feature == 0)
-		return (2);	/* should not happen due to RDTSC */
-
-	do_cpuid(0, p);
-	v[0] = p[1];
-	v[1] = p[3];
-	v[2] = p[2];
-	amd_cpu = memcmp(v, amd_id, sizeof(amd_id) - 1) == 0 ||
-	    memcmp(v, hygon_id, sizeof(hygon_id) - 1) == 0;
-
-	if (cpu_feature != 0) {
-		do_cpuid(0x80000000, p);
-		cpu_exthigh = p[0];
-	} else {
-		cpu_exthigh = 0;
-	}
-	if (cpu_exthigh >= 0x80000001) {
-		do_cpuid(0x80000001, p);
-		amd_feature = p[3];
-	} else {
-		amd_feature = 0;
-	}
-
-	if ((amd_feature & AMDID_RDTSCP) != 0)
-		return (3);
-	if ((cpu_feature & CPUID_SSE2) == 0)
-		return (2);
-	return (amd_cpu ? 1 : 0);
-}
-
-DEFINE_UIFUNC(static, u_int, __vdso_gettc_rdtsc_low,
-    (const struct vdso_timehands *th))
-{
-	return (tsc_selector[tsc_selector_idx(cpu_feature)].ts_rdtsc_low);
-}
-
-DEFINE_UIFUNC(static, u_int, __vdso_gettc_rdtsc32, (void))
-{
-	return (tsc_selector[tsc_selector_idx(cpu_feature)].ts_rdtsc32);
-}
-
-#define	HPET_DEV_MAP_MAX	10
-static volatile char *hpet_dev_map[HPET_DEV_MAP_MAX];
-
-static void
-__vdso_init_hpet(uint32_t u)
-{
-	static const char devprefix[] = "/dev/hpet";
-	char devname[64], *c, *c1, t;
-	volatile char *new_map, *old_map;
-	unsigned int mode;
-	uint32_t u1;
-	int fd;
-
-	c1 = c = stpcpy(devname, devprefix);
-	u1 = u;
-	do {
-		*c++ = u1 % 10 + '0';
-		u1 /= 10;
-	} while (u1 != 0);
-	*c = '\0';
-	for (c--; c1 != c; c1++, c--) {
-		t = *c1;
-		*c1 = *c;
-		*c = t;
-	}
-
-	old_map = hpet_dev_map[u];
-	if (old_map != NULL)
-		return;
-
-	/*
-	 * Explicitely check for the capability mode to avoid
-	 * triggering trap_enocap on the device open by absolute path.
-	 */
-	if ((cap_getmode(&mode) == 0 && mode != 0) ||
-	    (fd = _open(devname, O_RDONLY | O_CLOEXEC)) == -1) {
-		/* Prevent the caller from re-entering. */
-		atomic_cmpset_rel_ptr((volatile uintptr_t *)&hpet_dev_map[u],
-		    (uintptr_t)old_map, (uintptr_t)MAP_FAILED);
-		return;
-	}
-
-	new_map = mmap(NULL, PAGE_SIZE, PROT_READ, MAP_SHARED, fd, 0);
-	_close(fd);
-	if (atomic_cmpset_rel_ptr((volatile uintptr_t *)&hpet_dev_map[u],
-	    (uintptr_t)old_map, (uintptr_t)new_map) == 0 &&
-	    new_map != MAP_FAILED)
-		munmap((void *)new_map, PAGE_SIZE);
-}
-
-#ifdef WANT_HYPERV
-
-#define HYPERV_REFTSC_DEVPATH	"/dev/" HYPERV_REFTSC_DEVNAME
-
-/*
- * NOTE:
- * We use 'NULL' for this variable to indicate that initialization
- * is required.  And if this variable is 'MAP_FAILED', then Hyper-V
- * reference TSC can not be used, e.g. in misconfigured jail.
- */
-static struct hyperv_reftsc *hyperv_ref_tsc;
-
-static void
-__vdso_init_hyperv_tsc(void)
-{
-	int fd;
-	unsigned int mode;
-
-	if (cap_getmode(&mode) == 0 && mode != 0)
-		goto fail;
-
-	fd = _open(HYPERV_REFTSC_DEVPATH, O_RDONLY | O_CLOEXEC);
-	if (fd < 0)
-		goto fail;
-	hyperv_ref_tsc = mmap(NULL, sizeof(*hyperv_ref_tsc), PROT_READ,
-	    MAP_SHARED, fd, 0);
-	_close(fd);
-
-	return;
-fail:
-	/* Prevent the caller from re-entering. */
-	hyperv_ref_tsc = MAP_FAILED;
-}
-
-static int
-__vdso_hyperv_tsc(struct hyperv_reftsc *tsc_ref, u_int *tc)
-{
-	uint64_t disc, ret, tsc, scale;
-	uint32_t seq;
-	int64_t ofs;
-
-	while ((seq = atomic_load_acq_int(&tsc_ref->tsc_seq)) != 0) {
-		scale = tsc_ref->tsc_scale;
-		ofs = tsc_ref->tsc_ofs;
-
-		mfence();	/* XXXKIB */
-		tsc = rdtsc();
-
-		/* ret = ((tsc * scale) >> 64) + ofs */
-		__asm__ __volatile__ ("mulq %3" :
-		    "=d" (ret), "=a" (disc) :
-		    "a" (tsc), "r" (scale));
-		ret += ofs;
-
-		atomic_thread_fence_acq();
-		if (tsc_ref->tsc_seq == seq) {
-			*tc = ret;
-			return (0);
-		}
-
-		/* Sequence changed; re-sync. */
-	}
-	return (ENOSYS);
-}
-
-#endif	/* WANT_HYPERV */
-
-static struct pvclock_vcpu_time_info *pvclock_timeinfos;
-
-static int
-__vdso_pvclock_gettc(const struct vdso_timehands *th, u_int *tc)
-{
-	uint64_t delta, ns, tsc;
-	struct pvclock_vcpu_time_info *ti;
-	uint32_t cpuid_ti, cpuid_tsc, version;
-	bool stable;
-
-	do {
-		ti = &pvclock_timeinfos[0];
-		version = atomic_load_acq_32(&ti->version);
-		stable = (ti->flags & th->th_x86_pvc_stable_mask) != 0;
-		if (stable) {
-			tsc = rdtscp();
-		} else {
-			(void)rdtscp_aux(&cpuid_ti);
-			ti = &pvclock_timeinfos[cpuid_ti];
-			version = atomic_load_acq_32(&ti->version);
-			tsc = rdtscp_aux(&cpuid_tsc);
-		}
-		delta = tsc - ti->tsc_timestamp;
-		ns = ti->system_time + pvclock_scale_delta(delta,
-		    ti->tsc_to_system_mul, ti->tsc_shift);
-		atomic_thread_fence_acq();
-	} while ((ti->version & 1) != 0 || ti->version != version ||
-	    (!stable && cpuid_ti != cpuid_tsc));
-	*tc = MAX(ns, th->th_x86_pvc_last_systime);
-	return (0);
-}
-
-static void
-__vdso_init_pvclock_timeinfos(void)
-{
-	struct pvclock_vcpu_time_info *timeinfos;
-	size_t len;
-	int fd, ncpus;
-	unsigned int mode;
-
-	timeinfos = MAP_FAILED;
-	if (_elf_aux_info(AT_NCPUS, &ncpus, sizeof(ncpus)) != 0 ||
-	    (cap_getmode(&mode) == 0 && mode != 0) ||
-	    (fd = _open("/dev/" PVCLOCK_CDEVNAME, O_RDONLY | O_CLOEXEC)) < 0)
-		goto leave;
-	len = ncpus * sizeof(*pvclock_timeinfos);
-	timeinfos = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
-	_close(fd);
-leave:
-	if (atomic_cmpset_rel_ptr(
-	    (volatile uintptr_t *)&pvclock_timeinfos, (uintptr_t)NULL,
-	    (uintptr_t)timeinfos) == 0 && timeinfos != MAP_FAILED)
-		(void)munmap((void *)timeinfos, len);
-}
-
-#pragma weak __vdso_gettc
-int
-__vdso_gettc(const struct vdso_timehands *th, u_int *tc)
-{
-	volatile char *map;
-	uint32_t idx;
-
-	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:
-		idx = th->th_x86_hpet_idx;
-		if (idx >= HPET_DEV_MAP_MAX)
-			return (ENOSYS);
-		map = (volatile char *)atomic_load_acq_ptr(
-		    (volatile uintptr_t *)&hpet_dev_map[idx]);
-		if (map == NULL) {
-			__vdso_init_hpet(idx);
-			map = (volatile char *)atomic_load_acq_ptr(
-			    (volatile uintptr_t *)&hpet_dev_map[idx]);
-		}
-		if (map == MAP_FAILED)
-			return (ENOSYS);
-		*tc = *(volatile uint32_t *)(map + HPET_MAIN_COUNTER);
-		return (0);
-#ifdef WANT_HYPERV
-	case VDSO_TH_ALGO_X86_HVTSC:
-		if (hyperv_ref_tsc == NULL)
-			__vdso_init_hyperv_tsc();
-		if (hyperv_ref_tsc == MAP_FAILED)
-			return (ENOSYS);
-		return (__vdso_hyperv_tsc(hyperv_ref_tsc, tc));
-#endif
-	case VDSO_TH_ALGO_X86_PVCLK:
-		if (pvclock_timeinfos == NULL)
-			__vdso_init_pvclock_timeinfos();
-		if (pvclock_timeinfos == MAP_FAILED)
-			return (ENOSYS);
-		return (__vdso_pvclock_gettc(th, tc));
-	default:
-		return (ENOSYS);
-	}
-}
-
-#pragma weak __vdso_gettimekeep
-int
-__vdso_gettimekeep(struct vdso_timekeep **tk)
-{
-
-	return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));
-}