projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |