2 * Copyright (C) 2013 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_PERCPU_H
17 #define __ASM_PERCPU_H
21 static inline void set_my_cpu_offset(unsigned long off
)
23 asm volatile("msr tpidr_el1, %0" :: "r" (off
) : "memory");
26 static inline unsigned long __my_cpu_offset(void)
29 register unsigned long *sp
asm ("sp");
32 * We want to allow caching the value, so avoid using volatile and
33 * instead use a fake stack read to hazard against barrier().
35 asm("mrs %0, tpidr_el1" : "=r" (off
) : "Q" (*sp
));
39 #define __my_cpu_offset __my_cpu_offset()
41 #else /* !CONFIG_SMP */
43 #define set_my_cpu_offset(x) do { } while (0)
45 #endif /* CONFIG_SMP */
47 #include <asm-generic/percpu.h>
49 #endif /* __ASM_PERCPU_H */
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