/Ethereal-msm8939-beta9/arch/microblaze/include/asm/cmpxchg.h

https://bitbucket.org/MilosStamenkovic95/etherealos · C Header · 42 lines · 33 code · 9 blank · 0 comment · 1 complexity · f39b6fbcdb33517f42753a8c46a84110 MD5 · raw file 

    

  1. #ifndef _ASM_MICROBLAZE_CMPXCHG_H
    2. 

  2. #define _ASM_MICROBLAZE_CMPXCHG_H
    3. 

  3. 

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

  5. 

  6. void __bad_xchg(volatile void *ptr, int size);
    7. 

  7. 

  8. static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
    9. 

  9. 								int size)
    10. 

  10. {
    11. 

  11. 	unsigned long ret;
    12. 

  12. 	unsigned long flags;
    13. 

  13. 

  14. 	switch (size) {
    15. 

  15. 	case 1:
    16. 

  16. 		local_irq_save(flags);
    17. 

  17. 		ret = *(volatile unsigned char *)ptr;
    18. 

  18. 		*(volatile unsigned char *)ptr = x;
    19. 

  19. 		local_irq_restore(flags);
    20. 

  20. 		break;
    21. 

  21. 

  22. 	case 4:
    23. 

  23. 		local_irq_save(flags);
    24. 

  24. 		ret = *(volatile unsigned long *)ptr;
    25. 

  25. 		*(volatile unsigned long *)ptr = x;
    26. 

  26. 		local_irq_restore(flags);
    27. 

  27. 		break;
    28. 

  28. 	default:
    29. 

  29. 		__bad_xchg(ptr, size), ret = 0;
    30. 

  30. 		break;
    31. 

  31. 	}
    32. 

  32. 

  33. 	return ret;
    34. 

  34. }
    35. 

  35. 

  36. #define xchg(ptr, x) \
    37. 

  37. 	((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
    38. 

  38. 

  39. #include <asm-generic/cmpxchg.h>
    40. 

  40. #include <asm-generic/cmpxchg-local.h>
    41. 

  41. 

  42. #endif /* _ASM_MICROBLAZE_CMPXCHG_H */
    43.