diff options
Diffstat (limited to 'sys/arm64/linux/linux_vdso_gtod.c')
| -rw-r--r-- | sys/arm64/linux/linux_vdso_gtod.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/sys/arm64/linux/linux_vdso_gtod.c b/sys/arm64/linux/linux_vdso_gtod.c new file mode 100644 index 000000000000..682735cf2fa1 --- /dev/null +++ b/sys/arm64/linux/linux_vdso_gtod.c @@ -0,0 +1,153 @@ +/*- + * 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_write; + 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> |