Differential D30963 Diff 91577 lib/libc/riscv/sys/__vdso_gettc.c

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lib/libc/riscv/sys/__vdso_gettc.c

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				/*-
				* Copyright (c) 2021 Jessica Clarke
				*
				* 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("$FreeBSD$");
				mhorneUnsubmitted Not Done Inline Actions Nit: not required for new files mhorne: Nit: not required for new files
				impUnsubmitted Not Done Inline Actions for new files that won't be MFC'd to stable/12..... I don't think this will be, given the riscv support in 12 isn't so good (IIRC, I might be wrong), but thought I'd mention in case I am wrong. imp: for new files that won't be MFC'd to stable/12..... I don't think this will be, given the riscv…
				mhorneUnsubmitted Not Done Inline Actions That's right, there's no point bringing this past stable/13, but the precision is helpful. mhorne: That's right, there's no point bringing this past stable/13, but the precision is helpful.

				#include <sys/types.h>
				#include <sys/elf.h>
				#include <sys/time.h>
				#include <sys/vdso.h>

				#include <machine/riscvreg.h>

				#include <errno.h>

				#include "libc_private.h"

				#pragma weak __vdso_gettc
				int
				__vdso_gettc(const struct vdso_timehands th, u_int tc)
				{
				if (th->th_algo != VDSO_TH_ALGO_RISCV_RDTIME)
				return (ENOSYS);

				*tc = csr_read(time);
				return (0);
				jrtc27AuthorUnsubmitted Done Inline Actions Hm, plain csr_read might be more appropriate given the result is put in a u_int, though it's a bit academic given we don't support RV32. The two are the same on RV64 but on RV32 it'll loop until it reads a consistent time and timeh to get a 64-bit value from two 32-bit CSRs and then throw away the upper half. jrtc27: Hm, plain csr_read might be more appropriate given the result is put in a u_int, though it's a…
				}

				#pragma weak __vdso_gettimekeep
				int
				__vdso_gettimekeep(struct vdso_timekeep **tk)
				{
				return (_elf_aux_info(AT_TIMEKEEP, tk, sizeof(*tk)));
				}