c8a79231a5
To avoid confusing people, rename linux_timer.h to linux_time.h, as linux_timer.c is the implementation of timer syscalls only, while linux_time.c contains implementation of all stuff declared in linux_time.h. MFC after: 2 weeks
153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
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* Copyright (c) 2021 Dmitry Chagin <dchagin@FreeBSD.org>
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/elf.h>
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#include <sys/errno.h>
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#include <sys/proc.h>
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#include <sys/stddef.h>
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#define _KERNEL
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#include <sys/vdso.h>
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#undef _KERNEL
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#include <stdbool.h>
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#include <machine/atomic.h>
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#include <machine/stdarg.h>
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#include <arm64/linux/linux.h>
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#include <arm64/linux/linux_syscall.h>
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#include <compat/linux/linux_errno.h>
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#include <compat/linux/linux_time.h>
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/* The kernel fixup this at vDSO install */
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uintptr_t *kern_timekeep_base = NULL;
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uint32_t kern_tsc_selector = 0;
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static int
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write(int lfd, const void *lbuf, size_t lsize)
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{
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register long svc asm("x8") = LINUX_SYS_write;
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register int fd asm("x0") = lfd;
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register const char *buf asm("x1") = lbuf;
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register long size asm("x2") = lsize;
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register long res asm ("x0");
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asm volatile(
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" svc #0\n"
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: "=r" (res)
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: "r" (fd), "r" (buf), "r" (size), "r" (svc)
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: "memory");
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return (res);
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}
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static int
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__vdso_clock_gettime_fallback(clockid_t clock_id, struct l_timespec *lts)
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{
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register long svc asm("x8") = LINUX_SYS_linux_clock_gettime;
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register clockid_t clockid asm("x0") = clock_id;
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register struct l_timespec *ts asm("x1") = lts;
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register long res asm ("x0");
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asm volatile(
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" svc #0\n"
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: "=r" (res)
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: "r" (clockid), "r" (ts), "r" (svc)
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: "memory");
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return (res);
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}
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static int
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__vdso_gettimeofday_fallback(l_timeval *ltv, struct timezone *ltz)
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{
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register long svc asm("x8") = LINUX_SYS_gettimeofday;
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register l_timeval *tv asm("x0") = ltv;
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register struct timezone *tz asm("x1") = ltz;
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register long res asm ("x0");
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asm volatile(
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" svc #0\n"
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: "=r" (res)
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: "r" (tv), "r" (tz), "r" (svc)
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: "memory");
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return (res);
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}
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static int
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__vdso_clock_getres_fallback(clockid_t clock_id, struct l_timespec *lts)
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{
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register long svc asm("x8") = LINUX_SYS_linux_clock_getres;
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register clockid_t clockid asm("x0") = clock_id;
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register struct l_timespec *ts asm("x1") = lts;
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register long res asm ("x0");
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asm volatile(
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" svc #0\n"
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: "=r" (res)
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: "r" (clockid), "r" (ts), "r" (svc)
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: "memory");
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return (res);
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}
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/*
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* copied from lib/libc/aarch64/sys/__vdso_gettc.c
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*/
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static inline uint64_t
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cp15_cntvct_get(void)
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{
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uint64_t reg;
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__asm __volatile("mrs %0, cntvct_el0" : "=r" (reg));
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return (reg);
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}
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static inline uint64_t
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cp15_cntpct_get(void)
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{
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uint64_t reg;
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__asm __volatile("mrs %0, cntpct_el0" : "=r" (reg));
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return (reg);
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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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if (th->th_algo != VDSO_TH_ALGO_ARM_GENTIM)
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return (ENOSYS);
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__asm __volatile("isb" : : : "memory");
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*tc = th->th_physical == 0 ? cp15_cntvct_get() : cp15_cntpct_get();
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return (0);
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}
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#include <compat/linux/linux_vdso_gtod.inc>
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