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  1. #ifndef _LINUX_MATH64_H
  2. #define _LINUX_MATH64_H
  3.  
  4. #include <linux/types.h>
  5. #include <asm/div64.h>
  6.  
  7. #if BITS_PER_LONG == 64
  8.  
  9. #define div64_long(x, y) div64_s64((x), (y))
  10. #define div64_ul(x, y)   div64_u64((x), (y))
  11.  
  12. /**
  13.  * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
  14.  *
  15.  * This is commonly provided by 32bit archs to provide an optimized 64bit
  16.  * divide.
  17.  */
  18. static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
  19. {
  20.         *remainder = dividend % divisor;
  21.         return dividend / divisor;
  22. }
  23.  
  24. /**
  25.  * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
  26.  */
  27. static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
  28. {
  29.         *remainder = dividend % divisor;
  30.         return dividend / divisor;
  31. }
  32.  
  33. /**
  34.  * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
  35.  */
  36. static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
  37. {
  38.         *remainder = dividend % divisor;
  39.         return dividend / divisor;
  40. }
  41.  
  42. /**
  43.  * div64_u64 - unsigned 64bit divide with 64bit divisor
  44.  */
  45. static inline u64 div64_u64(u64 dividend, u64 divisor)
  46. {
  47.         return dividend / divisor;
  48. }
  49.  
  50. /**
  51.  * div64_s64 - signed 64bit divide with 64bit divisor
  52.  */
  53. static inline s64 div64_s64(s64 dividend, s64 divisor)
  54. {
  55.         return dividend / divisor;
  56. }
  57.  
  58. #elif BITS_PER_LONG == 32
  59.  
  60. #define div64_long(x, y) div_s64((x), (y))
  61. #define div64_ul(x, y)   div_u64((x), (y))
  62.  
  63. #ifndef div_u64_rem
  64. static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
  65. {
  66.         *remainder = do_div(dividend, divisor);
  67.         return dividend;
  68. }
  69. #endif
  70.  
  71. #ifndef div_s64_rem
  72. extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
  73. #endif
  74.  
  75. #ifndef div64_u64_rem
  76. extern u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder);
  77. #endif
  78.  
  79. #ifndef div64_u64
  80. extern u64 div64_u64(u64 dividend, u64 divisor);
  81. #endif
  82.  
  83. #ifndef div64_s64
  84. extern s64 div64_s64(s64 dividend, s64 divisor);
  85. #endif
  86.  
  87. #endif /* BITS_PER_LONG */
  88.  
  89. /**
  90.  * div_u64 - unsigned 64bit divide with 32bit divisor
  91.  *
  92.  * This is the most common 64bit divide and should be used if possible,
  93.  * as many 32bit archs can optimize this variant better than a full 64bit
  94.  * divide.
  95.  */
  96. #ifndef div_u64
  97. static inline u64 div_u64(u64 dividend, u32 divisor)
  98. {
  99.         u32 remainder;
  100.         return div_u64_rem(dividend, divisor, &remainder);
  101. }
  102. #endif
  103.  
  104. /**
  105.  * div_s64 - signed 64bit divide with 32bit divisor
  106.  */
  107. #ifndef div_s64
  108. static inline s64 div_s64(s64 dividend, s32 divisor)
  109. {
  110.         s32 remainder;
  111.         return div_s64_rem(dividend, divisor, &remainder);
  112. }
  113. #endif
  114.  
  115. u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
  116.  
  117. static __always_inline u32
  118. __iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
  119. {
  120.         u32 ret = 0;
  121.  
  122.         while (dividend >= divisor) {
  123.                 /* The following asm() prevents the compiler from
  124.                    optimising this loop into a modulo operation.  */
  125.                 asm("" : "+rm"(dividend));
  126.  
  127.                 dividend -= divisor;
  128.                 ret++;
  129.         }
  130.  
  131.         *remainder = dividend;
  132.  
  133.         return ret;
  134. }
  135.  
  136. #if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
  137.  
  138. #ifndef mul_u64_u32_shr
  139. static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
  140. {
  141.         return (u64)(((unsigned __int128)a * mul) >> shift);
  142. }
  143. #endif /* mul_u64_u32_shr */
  144.  
  145. #else
  146.  
  147. #ifndef mul_u64_u32_shr
  148. static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)
  149. {
  150.         u32 ah, al;
  151.         u64 ret;
  152.  
  153.         al = a;
  154.         ah = a >> 32;
  155.  
  156.         ret = ((u64)al * mul) >> shift;
  157.         if (ah)
  158.                 ret += ((u64)ah * mul) << (32 - shift);
  159.  
  160.         return ret;
  161. }
  162. #endif /* mul_u64_u32_shr */
  163.  
  164. #endif
  165.  
  166. #endif /* _LINUX_MATH64_H */
  167.