tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2013 ARM Ltd.
3 *
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.
7 *
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.
12 *
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/>.
15 */
16#ifndef __ASM_PERCPU_H
17#define __ASM_PERCPU_H
18
19static inline void set_my_cpu_offset(unsigned long off)
20{
21 asm volatile("msr tpidr_el1, %0" :: "r" (off) : "memory");
22}
23
24static inline unsigned long __my_cpu_offset(void)
25{
26 unsigned long off;
27 register unsigned long *sp asm ("sp");
28
29 /*
30 * We want to allow caching the value, so avoid using volatile and
31 * instead use a fake stack read to hazard against barrier().
32 */
33 asm("mrs %0, tpidr_el1" : "=r" (off) : "Q" (*sp));
34
35 return off;
36}
37#define __my_cpu_offset __my_cpu_offset()
38
39#include <asm-generic/percpu.h>
40
41#endif /* __ASM_PERCPU_H */