/Ethereal-msm8939-beta9/arch/metag/include/asm/cmpxchg_irq.h

https://bitbucket.org/MilosStamenkovic95/etherealos · C Header · 42 lines · 34 code · 8 blank · 0 comment · 2 complexity · d235188d257bdb5e2ccb719f7e9e2b12 MD5 · raw file 

    

  1. #ifndef __ASM_METAG_CMPXCHG_IRQ_H
    2. 

  2. #define __ASM_METAG_CMPXCHG_IRQ_H
    3. 

  3. 

  4. #include <linux/irqflags.h>
    5. 

  5. 

  6. static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
    7. 

  7. {
    8. 

  8. 	unsigned long flags, retval;
    9. 

  9. 

  10. 	local_irq_save(flags);
    11. 

  11. 	retval = *m;
    12. 

  12. 	*m = val;
    13. 

  13. 	local_irq_restore(flags);
    14. 

  14. 	return retval;
    15. 

  15. }
    16. 

  16. 

  17. static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
    18. 

  18. {
    19. 

  19. 	unsigned long flags, retval;
    20. 

  20. 

  21. 	local_irq_save(flags);
    22. 

  22. 	retval = *m;
    23. 

  23. 	*m = val & 0xff;
    24. 

  24. 	local_irq_restore(flags);
    25. 

  25. 	return retval;
    26. 

  26. }
    27. 

  27. 

  28. static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
    29. 

  29. 					  unsigned long new)
    30. 

  30. {
    31. 

  31. 	__u32 retval;
    32. 

  32. 	unsigned long flags;
    33. 

  33. 

  34. 	local_irq_save(flags);
    35. 

  35. 	retval = *m;
    36. 

  36. 	if (retval == old)
    37. 

  37. 		*m = new;
    38. 

  38. 	local_irq_restore(flags);       /* implies memory barrier  */
    39. 

  39. 	return retval;
    40. 

  40. }
    41. 

  41. 

  42. #endif /* __ASM_METAG_CMPXCHG_IRQ_H */
    43.