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Diffstat (limited to 'arch/arm/include/asm/percpu.h')
-rw-r--r-- | arch/arm/include/asm/percpu.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h new file mode 100644 index 000000000000..968c0a14e0a3 --- /dev/null +++ b/arch/arm/include/asm/percpu.h | |||
@@ -0,0 +1,45 @@ | |||
1 | /* | ||
2 | * Copyright 2012 Calxeda, Inc. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify it | ||
5 | * under the terms and conditions of the GNU General Public License, | ||
6 | * version 2, as published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope it will be useful, but WITHOUT | ||
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
11 | * more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License along with | ||
14 | * this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | #ifndef _ASM_ARM_PERCPU_H_ | ||
17 | #define _ASM_ARM_PERCPU_H_ | ||
18 | |||
19 | /* | ||
20 | * Same as asm-generic/percpu.h, except that we store the per cpu offset | ||
21 | * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7 | ||
22 | */ | ||
23 | #if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6) | ||
24 | static inline void set_my_cpu_offset(unsigned long off) | ||
25 | { | ||
26 | /* Set TPIDRPRW */ | ||
27 | asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (off) : "memory"); | ||
28 | } | ||
29 | |||
30 | static inline unsigned long __my_cpu_offset(void) | ||
31 | { | ||
32 | unsigned long off; | ||
33 | /* Read TPIDRPRW */ | ||
34 | asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : : "memory"); | ||
35 | return off; | ||
36 | } | ||
37 | #define __my_cpu_offset __my_cpu_offset() | ||
38 | #else | ||
39 | #define set_my_cpu_offset(x) do {} while(0) | ||
40 | |||
41 | #endif /* CONFIG_SMP */ | ||
42 | |||
43 | #include <asm-generic/percpu.h> | ||
44 | |||
45 | #endif /* _ASM_ARM_PERCPU_H_ */ | ||