d4b2d3035a
Add vDSO support for timekeeping devices that support the KVM/XEN paravirtual clock API. Also, expose, in the userspace-accessible '<machine/pvclock.h>', definitions that will be needed by 'libc' to support 'VDSO_TH_ALGO_X86_PVCLK'. Sponsored by: Juniper Networks, Inc. Sponsored by: Klara, Inc. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D31418
57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright 2012 Konstantin Belousov <kib@FreeBSD.ORG>.
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* Copyright 2016 The FreeBSD Foundation.
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* All rights reserved.
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _X86_VDSO_H
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#define _X86_VDSO_H
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#define VDSO_TIMEHANDS_MD \
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uint32_t th_x86_shift; \
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uint32_t th_x86_hpet_idx; \
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uint64_t th_x86_pvc_last_systime;\
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uint8_t th_x86_pvc_stable_mask; \
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uint8_t th_res[15];
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#define VDSO_TH_ALGO_X86_TSC VDSO_TH_ALGO_1
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#define VDSO_TH_ALGO_X86_HPET VDSO_TH_ALGO_2
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#define VDSO_TH_ALGO_X86_HVTSC VDSO_TH_ALGO_3 /* Hyper-V ref. TSC */
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#define VDSO_TH_ALGO_X86_PVCLK VDSO_TH_ALGO_4 /* KVM/XEN paravirtual clock */
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#ifdef _KERNEL
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#ifdef COMPAT_FREEBSD32
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#define VDSO_TIMEHANDS_MD32 VDSO_TIMEHANDS_MD
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#endif
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#endif
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#endif
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