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/*
* Copyright (C) 2013 ARM Ltd.
*
* 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/>.
*/
#ifndef __ASM_PERCPU_H
#define __ASM_PERCPU_H
#ifdef CONFIG_SMP
static inline void set_my_cpu_offset(unsigned long off)
{
asm volatile("msr tpidr_el1, %0" :: "r" (off) : "memory");
}
static inline unsigned long __my_cpu_offset(void)
{
unsigned long off;
/*
* We want to allow caching the value, so avoid using volatile and
* instead use a fake stack read to hazard against barrier().
*/
asm("mrs %0, tpidr_el1" : "=r" (off) :
"Q" (*(const unsigned long *)current_stack_pointer));
return off;
}
#define __my_cpu_offset __my_cpu_offset()
#else /* !CONFIG_SMP */
#define set_my_cpu_offset(x) do { } while (0)
#endif /* CONFIG_SMP */
#include <asm-generic/percpu.h>
#endif /* __ASM_PERCPU_H */
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