projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1efe4ce3 SM |
2 | #ifndef __ASM_SH_CMPXCHG_IRQ_H |
| 3 | #define __ASM_SH_CMPXCHG_IRQ_H | |
| 4 | ||
| e839ca52 DH |
5 | #include <linux/irqflags.h> |
| 6 | ||
| 1efe4ce3 SM |
7 | static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val) |
| 8 | { | |
| 9 | unsigned long flags, retval; | |
| 10 | ||
| 11 | local_irq_save(flags); | |
| 12 | retval = *m; | |
| 13 | *m = val; | |
| 14 | local_irq_restore(flags); | |
| 15 | return retval; | |
| 16 | } | |
| 17 | ||
| 3226aad8 MT |
18 | static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val) |
| 19 | { | |
| 20 | unsigned long flags, retval; | |
| 21 | ||
| 22 | local_irq_save(flags); | |
| 23 | retval = *m; | |
| 24 | *m = val; | |
| 25 | local_irq_restore(flags); | |
| 26 | return retval; | |
| 27 | } | |
| 28 | ||
| 1efe4ce3 SM |
29 | static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val) |
| 30 | { | |
| 31 | unsigned long flags, retval; | |
| 32 | ||
| 33 | local_irq_save(flags); | |
| 34 | retval = *m; | |
| 35 | *m = val & 0xff; | |
| 36 | local_irq_restore(flags); | |
| 37 | return retval; | |
| 38 | } | |
| 39 | ||
| 40 | static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old, | |
| 41 | unsigned long new) | |
| 42 | { | |
| 43 | __u32 retval; | |
| 44 | unsigned long flags; | |
| 45 | ||
| 46 | local_irq_save(flags); | |
| 47 | retval = *m; | |
| 48 | if (retval == old) | |
| 49 | *m = new; | |
| 50 | local_irq_restore(flags); /* implies memory barrier */ | |
| 51 | return retval; | |
| 52 | } | |
| 53 | ||
| 54 | #endif /* __ASM_SH_CMPXCHG_IRQ_H */ |