/*
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* Copyright (C) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.org>.
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* Copyright (C) 2013 Gilles Chanteperdrix <gch@xenomai.org>.
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*
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* ARM port
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* Copyright (C) 2005 Stelian Pop
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*
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* Copyright (C) 2007 Sebastian Smolorz <sesmo@gmx.net>
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* Support for TSC emulation in user space for decrementing counters
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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 _LIB_COBALT_ARM_TSC_H
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#define _LIB_COBALT_ARM_TSC_H
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#include <asm/xenomai/uapi/tsc.h>
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#include <asm/xenomai/features.h>
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/*
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* Putting kuser_tsc_get and kinfo.counter in the same struct results
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* in less operations in PIC code, thus optimizes.
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*/
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typedef unsigned long long __xn_rdtsc_t(volatile unsigned *vaddr);
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struct __xn_full_tscinfo {
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__xn_rdtsc_t *kuser_tsc_get;
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struct __xn_tscinfo kinfo;
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};
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extern struct __xn_full_tscinfo __xn_tscinfo;
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static inline __attribute__((always_inline))
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unsigned long long cobalt_read_legacy_tsc(void)
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{
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return __xn_tscinfo.kuser_tsc_get(__xn_tscinfo.kinfo.counter);
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}
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#endif /* !_LIB_COBALT_ARM_TSC_H */
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