/*
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* Copyright (C) 2009 Wolfgang Mauerer <wolfgang.mauerer@siemens.com>.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#ifndef _COBALT_UAPI_KERNEL_VDSO_H
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#define _COBALT_UAPI_KERNEL_VDSO_H
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#include <cobalt/uapi/kernel/urw.h>
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/*
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* I-pipe only. Dovetail enables the common vDSO for getting
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* CLOCK_REALTIME timestamps from the out-of-band stage
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* (XNVDSO_FEAT_HOST_REALTIME is cleared in this case).
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*/
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struct xnvdso_hostrt_data {
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__u64 wall_sec;
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__u64 wtom_sec;
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__u64 cycle_last;
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__u64 mask;
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__u32 wall_nsec;
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__u32 wtom_nsec;
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__u32 mult;
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__u32 shift;
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__u32 live;
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urw_t lock;
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};
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/*
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* Data shared between the Cobalt kernel and applications, which lives
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* in the shared memory heap (COBALT_MEMDEV_SHARED).
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* xnvdso_hostrt_data.features tells which data is present. Notice
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* that struct xnvdso may only grow, but never shrink.
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*/
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struct xnvdso {
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__u64 features;
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/* XNVDSO_FEAT_HOST_REALTIME */
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struct xnvdso_hostrt_data hostrt_data;
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/* XNVDSO_FEAT_WALLCLOCK_OFFSET */
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__u64 wallclock_offset;
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};
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/* For each shared feature, add a flag below. */
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#define XNVDSO_FEAT_HOST_REALTIME 0x0000000000000001ULL
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#define XNVDSO_FEAT_WALLCLOCK_OFFSET 0x0000000000000002ULL
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static inline int xnvdso_test_feature(struct xnvdso *vdso,
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__u64 feature)
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{
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return (vdso->features & feature) != 0;
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}
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#endif /* !_COBALT_UAPI_KERNEL_VDSO_H */
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