David Howells | c40d04d | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 1 | #ifndef _ASM_MICROBLAZE_CMPXCHG_H |
| 2 | #define _ASM_MICROBLAZE_CMPXCHG_H |
| 3 | |
Michal Simek | 90c0d80 | 2012-03-30 11:29:38 +0200 | [diff] [blame] | 4 | #include <linux/irqflags.h> |
| 5 | |
David Howells | c40d04d | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 6 | void __bad_xchg(volatile void *ptr, int size); |
| 7 | |
| 8 | static inline unsigned long __xchg(unsigned long x, volatile void *ptr, |
| 9 | int size) |
| 10 | { |
| 11 | unsigned long ret; |
| 12 | unsigned long flags; |
| 13 | |
| 14 | switch (size) { |
| 15 | case 1: |
| 16 | local_irq_save(flags); |
| 17 | ret = *(volatile unsigned char *)ptr; |
| 18 | *(volatile unsigned char *)ptr = x; |
| 19 | local_irq_restore(flags); |
| 20 | break; |
| 21 | |
| 22 | case 4: |
| 23 | local_irq_save(flags); |
| 24 | ret = *(volatile unsigned long *)ptr; |
| 25 | *(volatile unsigned long *)ptr = x; |
| 26 | local_irq_restore(flags); |
| 27 | break; |
| 28 | default: |
| 29 | __bad_xchg(ptr, size), ret = 0; |
| 30 | break; |
| 31 | } |
| 32 | |
| 33 | return ret; |
| 34 | } |
| 35 | |
| 36 | #define xchg(ptr, x) \ |
| 37 | ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) |
| 38 | |
| 39 | #include <asm-generic/cmpxchg.h> |
| 40 | #include <asm-generic/cmpxchg-local.h> |
| 41 | |
| 42 | #endif /* _ASM_MICROBLAZE_CMPXCHG_H */ |