/*
|
* Copyright (C) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.org>.
|
* Copyright (C) 2013 Gilles Chanteperdrix <gch@xenomai.org>.
|
*
|
* ARM port
|
* Copyright (C) 2005 Stelian Pop
|
*
|
* Copyright (C) 2007 Sebastian Smolorz <sesmo@gmx.net>
|
* Support for TSC emulation in user space for decrementing counters
|
*
|
* This library is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU Lesser General Public
|
* License as published by the Free Software Foundation; either
|
* version 2 of the License, or (at your option) any later version.
|
*
|
* This library is distributed in the hope that it will be useful,
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
* Lesser General Public License for more details.
|
*
|
* You should have received a copy of the GNU Lesser General Public
|
* License along with this library; if not, write to the Free Software
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
*/
|
#ifndef _LIB_COBALT_ARM64_TSC_H
|
#define _LIB_COBALT_ARM64_TSC_H
|
|
#include <asm/xenomai/uapi/tsc.h>
|
#include <asm/xenomai/features.h>
|
#include <inttypes.h>
|
#include <sys/time.h>
|
|
typedef unsigned long long __xn_rdtsc_t(volatile unsigned *vaddr);
|
struct __xn_full_tscinfo {
|
struct __xn_tscinfo kinfo;
|
};
|
extern struct __xn_full_tscinfo __xn_tscinfo;
|
|
static inline uint64_t get_counter(void)
|
{
|
uint64_t cval;
|
|
asm volatile("isb; mrs %0, cntvct_el0; isb; " : "=r" (cval) :: "memory");
|
|
return cval;
|
}
|
|
static inline __attribute__((always_inline))
|
unsigned long long cobalt_read_legacy_tsc(void)
|
{
|
return get_counter();
|
}
|
|
#endif /* !_LIB_COBALT_ARM64_TSC_H */
|
