diff options
Diffstat (limited to 'lib/libc/arch/aarch64')
| -rw-r--r-- | lib/libc/arch/aarch64/gen/usertc.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/lib/libc/arch/aarch64/gen/usertc.c b/lib/libc/arch/aarch64/gen/usertc.c index f73831f742e..d1dd51c9a78 100644 --- a/lib/libc/arch/aarch64/gen/usertc.c +++ b/lib/libc/arch/aarch64/gen/usertc.c @@ -1,6 +1,6 @@ -/* $OpenBSD: usertc.c,v 1.1 2020/07/06 13:33:05 pirofti Exp $ */ +/* $OpenBSD: usertc.c,v 1.2 2020/07/15 22:58:33 kettenis Exp $ */ /* - * Copyright (c) 2020 Paul Irofti <paul@irofti.net> + * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above @@ -18,4 +18,30 @@ #include <sys/types.h> #include <sys/timetc.h> -int (*const _tc_get_timecount)(struct timekeep *, u_int *) = NULL; +static inline u_int +agtimer_get_timecount(struct timecounter *tc) +{ + uint64_t val; + + /* + * No need to work around Cortex-A73 errata 858921 since we + * only look at the low 32 bits here. + */ + __asm volatile("isb" ::: "memory"); + __asm volatile("mrs %x0, CNTVCT_EL0" : "=r" (val)); + return (val & 0xffffffff); +} + +static int +tc_get_timecount(struct timekeep *tk, u_int *tc) +{ + switch (tk->tk_user) { + case TC_AGTIMER: + *tc = agtimer_get_timecount(NULL); + return 0; + } + + return -1; +} + +int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount; |