projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1efe4ce3 SM |
1 | #ifndef __ASM_SH_CMPXCHG_IRQ_H |
| 2 | #define __ASM_SH_CMPXCHG_IRQ_H | |
| 3 | ||
| e839ca52 DH |
4 | #include <linux/irqflags.h> |
| 5 | ||
| 1efe4ce3 SM |
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 | ||
| 3226aad8 MT |
17 | static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val) |
| 18 | { | |
| 19 | unsigned long flags, retval; | |
| 20 | ||
| 21 | local_irq_save(flags); | |
| 22 | retval = *m; | |
| 23 | *m = val; | |
| 24 | local_irq_restore(flags); | |
| 25 | return retval; | |
| 26 | } | |
| 27 | ||
| 1efe4ce3 SM |
28 | static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) |
| 29 | { | |
| 30 | unsigned long flags, retval; | |
| 31 | ||
| 32 | local_irq_save(flags); | |
| 33 | retval = *m; | |
| 34 | *m = val & 0xff; | |
| 35 | local_irq_restore(flags); | |
| 36 | return retval; | |
| 37 | } | |
| 38 | ||
| 39 | static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, | |
| 40 | unsigned long new) | |
| 41 | { | |
| 42 | __u32 retval; | |
| 43 | unsigned long flags; | |
| 44 | ||
| 45 | local_irq_save(flags); | |
| 46 | retval = *m; | |
| 47 | if (retval == old) | |
| 48 | *m = new; | |
| 49 | local_irq_restore(flags); /* implies memory barrier */ | |
| 50 | return retval; | |
| 51 | } | |
| 52 | ||
| 53 | #endif /* __ASM_SH_CMPXCHG_IRQ_H */ |