1 #ifndef __ASM_SH_CMPXCHG_IRQ_H 2 #define __ASM_SH_CMPXCHG_IRQ_H 3 4 #include <linux/irqflags.h> 5 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_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 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 */ 54