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sys/arm64/linux/linux_vdso_gtod.c
- This file was added.
| /*- | |||||
| * SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
| * | |||||
| * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org> | |||||
| * Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org> | |||||
| * | |||||
| * 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/elf.h> | |||||
| #include <sys/errno.h> | |||||
| #include <sys/proc.h> | |||||
| #include <sys/stddef.h> | |||||
| #define _KERNEL | |||||
| #include <sys/vdso.h> | |||||
| #undef _KERNEL | |||||
| #include <stdbool.h> | |||||
| #include <strings.h> | |||||
| #include <machine/atomic.h> | |||||
| #include <machine/stdarg.h> | |||||
| #include <arm64/linux/linux.h> | |||||
| #include <arm64/linux/linux_syscall.h> | |||||
| #include <compat/linux/linux_errno.h> | |||||
| #include <compat/linux/linux_timer.h> | |||||
| /* The kernel fixup this at vDSO install */ | |||||
| uintptr_t *kern_timekeep_base = NULL; | |||||
| uint32_t kern_tsc_selector = 0; | |||||
| static int | |||||
| write(int lfd, const void *lbuf, size_t lsize) | |||||
| { | |||||
| register long svc asm("x8") = LINUX_SYS_linux_clock_gettime; | |||||
| register int fd asm("x0") = lfd; | |||||
| register const char *buf asm("x1") = lbuf; | |||||
| register long size asm("x2") = lsize; | |||||
| register long res asm ("x0"); | |||||
| asm volatile( | |||||
| " svc #0\n" | |||||
| : "=r" (res) | |||||
| : "r" (fd), "r" (buf), "r" (size), "r" (svc) | |||||
| : "memory"); | |||||
| return (res); | |||||
| } | |||||
| static int | |||||
| __vdso_clock_gettime_fallback(clockid_t clock_id, struct l_timespec *lts) | |||||
| { | |||||
| register long svc asm("x8") = LINUX_SYS_linux_clock_gettime; | |||||
| register clockid_t clockid asm("x0") = clock_id; | |||||
| register struct l_timespec *ts asm("x1") = lts; | |||||
| register long res asm ("x0"); | |||||
| asm volatile( | |||||
| " svc #0\n" | |||||
| : "=r" (res) | |||||
| : "r" (clockid), "r" (ts), "r" (svc) | |||||
| : "memory"); | |||||
| return (res); | |||||
| } | |||||
| static int | |||||
| __vdso_gettimeofday_fallback(l_timeval *ltv, struct timezone *ltz) | |||||
| { | |||||
| register long svc asm("x8") = LINUX_SYS_gettimeofday; | |||||
| register l_timeval *tv asm("x0") = ltv; | |||||
| register struct timezone *tz asm("x1") = ltz; | |||||
| register long res asm ("x0"); | |||||
| asm volatile( | |||||
| " svc #0\n" | |||||
| : "=r" (res) | |||||
| : "r" (tv), "r" (tz), "r" (svc) | |||||
| : "memory"); | |||||
| return (res); | |||||
| } | |||||
| static int | |||||
| __vdso_clock_getres_fallback(clockid_t clock_id, struct l_timespec *lts) | |||||
| { | |||||
| register long svc asm("x8") = LINUX_SYS_linux_clock_getres; | |||||
| register clockid_t clockid asm("x0") = clock_id; | |||||
| register struct l_timespec *ts asm("x1") = lts; | |||||
| register long res asm ("x0"); | |||||
| asm volatile( | |||||
| " svc #0\n" | |||||
| : "=r" (res) | |||||
| : "r" (clockid), "r" (ts), "r" (svc) | |||||
| : "memory"); | |||||
| return (res); | |||||
| } | |||||
| /* | |||||
| * copied from lib/libc/aarch64/sys/__vdso_gettc.c | |||||
| */ | |||||
| static inline uint64_t | |||||
| cp15_cntvct_get(void) | |||||
| { | |||||
| uint64_t reg; | |||||
| __asm __volatile("mrs %0, cntvct_el0" : "=r" (reg)); | |||||
| return (reg); | |||||
| } | |||||
| static inline uint64_t | |||||
| cp15_cntpct_get(void) | |||||
| { | |||||
| uint64_t reg; | |||||
| __asm __volatile("mrs %0, cntpct_el0" : "=r" (reg)); | |||||
| return (reg); | |||||
| } | |||||
| int | |||||
| __vdso_gettc(const struct vdso_timehands *th, u_int *tc) | |||||
| { | |||||
| if (th->th_algo != VDSO_TH_ALGO_ARM_GENTIM) | |||||
| return (ENOSYS); | |||||
| __asm __volatile("isb" : : : "memory"); | |||||
| *tc = th->th_physical == 0 ? cp15_cntvct_get() : cp15_cntpct_get(); | |||||
| return (0); | |||||
| } | |||||
| #include <compat/linux/linux_vdso_gtod.inc> | |||||