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71586276 WD |
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 | ||
b57fc9e8 CM |
19 | #ifdef CONFIG_SMP |
20 | ||
71586276 WD |
21 | static inline void set_my_cpu_offset(unsigned long off) |
22 | { | |
23 | asm volatile("msr tpidr_el1, %0" :: "r" (off) : "memory"); | |
24 | } | |
25 | ||
26 | static 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 | ||
b57fc9e8 CM |
41 | #else /* !CONFIG_SMP */ |
42 | ||
43 | #define set_my_cpu_offset(x) do { } while (0) | |
44 | ||
45 | #endif /* CONFIG_SMP */ | |
46 | ||
71586276 WD |
47 | #include <asm-generic/percpu.h> |
48 | ||
49 | #endif /* __ASM_PERCPU_H */ |