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/*
* Userspace implementations of fallback calls
*
* Copyright (C) 2017 Cavium, Inc.
* Copyright (C) 2012 ARM Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Will Deacon <will.deacon@arm.com>
* Rewriten into C by: Andrew Pinski <apinski@cavium.com>
*/
#ifndef __VDSO_COMPILER_H
#define __VDSO_COMPILER_H
#include <asm/processor.h> /* for cpu_relax() */
#include <asm/sysreg.h> /* for read_sysreg() */
#include <asm/unistd.h>
#include <linux/compiler.h>
#include <linux/hrtimer.h> /* for LOW_RES_NSEC and MONOTONIC_RES_NSEC */
#ifdef CONFIG_ARM_ARCH_TIMER
#define ARCH_PROVIDES_TIMER
#endif
#define DEFINE_FALLBACK(name, type_arg1, name_arg1, type_arg2, name_arg2) \
static notrace long name##_fallback(type_arg1 _##name_arg1, \
type_arg2 _##name_arg2) \
{ \
register type_arg1 name_arg1 asm("x0") = _##name_arg1; \
register type_arg2 name_arg2 asm("x1") = _##name_arg2; \
register long ret asm ("x0"); \
register long nr asm("x8") = __NR_##name; \
\
asm volatile( \
" svc #0\n" \
: "=r" (ret) \
: "r" (name_arg1), "r" (name_arg2), "r" (nr) \
: "memory"); \
\
return ret; \
}
/*
* AArch64 implementation of arch_counter_get_cntvct() suitable for vdso
*/
static __always_inline notrace u64 arch_vdso_read_counter(void)
{
/* Read the virtual counter. */
isb();
return read_sysreg(cntvct_el0);
}
/* Rename exported vdso functions */
#define __vdso_clock_gettime __kernel_clock_gettime
#define __vdso_gettimeofday __kernel_gettimeofday
#define __vdso_clock_getres __kernel_clock_getres
#define __vdso_time __kernel_time
#endif /* __VDSO_COMPILER_H */
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