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
19#ifdef CONFIG_SMP
20
21static inline void set_my_cpu_offset(unsigned long off)
22{
23 asm volatile("msr tpidr_el1, %0" :: "r" (off) : "memory");
24}
25
26static inline unsigned long __my_cpu_offset(void)
27{
28 unsigned long off;
29 register unsigned long *sp asm ("sp");
30
31 /*
32 * We want to allow caching the value, so avoid using volatile and
33 * instead use a fake stack read to hazard against barrier().
34 */
35 asm("mrs %0, tpidr_el1" : "=r" (off) : "Q" (*sp));
36
37 return off;
38}
39#define __my_cpu_offset __my_cpu_offset()
40
41#else /* !CONFIG_SMP */
42
43#define set_my_cpu_offset(x) do { } while (0)
44
45#endif /* CONFIG_SMP */
46
47#include <asm-generic/percpu.h>
48
49#endif /* __ASM_PERCPU_H */