| Stuart Menefy | 1efe4ce | 2007-11-30 16:12:36 +0900 | [diff] [blame] | 1 | #ifndef __ASM_SH_CMPXCHG_IRQ_H |
| 2 | #define __ASM_SH_CMPXCHG_IRQ_H |
| 3 | |
| David Howells | e839ca5 | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 4 | #include <linux/irqflags.h> |
| 5 | |
| Stuart Menefy | 1efe4ce | 2007-11-30 16:12:36 +0900 | [diff] [blame] | 6 | static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) |
| 7 | { |
| 8 | unsigned long flags, retval; |
| 9 | |
| 10 | local_irq_save(flags); |
| 11 | retval = *m; |
| 12 | *m = val; |
| 13 | local_irq_restore(flags); |
| 14 | return retval; |
| 15 | } |
| 16 | |
| 17 | static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) |
| 18 | { |
| 19 | unsigned long flags, retval; |
| 20 | |
| 21 | local_irq_save(flags); |
| 22 | retval = *m; |
| 23 | *m = val & 0xff; |
| 24 | local_irq_restore(flags); |
| 25 | return retval; |
| 26 | } |
| 27 | |
| 28 | static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, |
| 29 | unsigned long new) |
| 30 | { |
| 31 | __u32 retval; |
| 32 | unsigned long flags; |
| 33 | |
| 34 | local_irq_save(flags); |
| 35 | retval = *m; |
| 36 | if (retval == old) |
| 37 | *m = new; |
| 38 | local_irq_restore(flags); /* implies memory barrier */ |
| 39 | return retval; |
| 40 | } |
| 41 | |
| 42 | #endif /* __ASM_SH_CMPXCHG_IRQ_H */ |