diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/arch/riscv64/gen/usertc.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/lib/libc/arch/riscv64/gen/usertc.c b/lib/libc/arch/riscv64/gen/usertc.c index 2274976a08f..f0f36b6fa38 100644 --- a/lib/libc/arch/riscv64/gen/usertc.c +++ b/lib/libc/arch/riscv64/gen/usertc.c @@ -1,6 +1,7 @@ -/* $OpenBSD: usertc.c,v 1.1 2021/04/29 18:33:36 drahn Exp $ */ +/* $OpenBSD: usertc.c,v 1.2 2021/07/24 22:41:09 jca Exp $ */ /* * Copyright (c) 2020 Paul Irofti <paul@irofti.net> + * Copyright (c) 2021 Jeremie Courreges-Anglas <jca@wxcvbn.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 +19,26 @@ #include <sys/types.h> #include <sys/timetc.h> -int (*const _tc_get_timecount)(struct timekeep *, u_int *) = NULL; +static inline u_int +rdtime(void) +{ + uint64_t ret; + + __asm volatile("rdtime %0" : "=r"(ret)); + + return ret; +} + +static int +tc_get_timecount(struct timekeep *tk, u_int *tc) +{ + switch (tk->tk_user) { + case TC_TB: + *tc = rdtime(); + return 0; + } + + return -1; +} + +int (*const _tc_get_timecount)(struct timekeep *, u_int *) = tc_get_timecount; |