include/asm-mips/div64.h

   1 /*
   2  * Copyright (C) 2000, 2004  Maciej W. Rozycki
   3  * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  */
   9 #ifndef _ASM_DIV64_H
  10 #define _ASM_DIV64_H
  11
  12 #include <linux/types.h>
  13
  14 #if (_MIPS_SZLONG == 32)
  15
  16 #include <asm/compiler.h>
  17
  18 /*
  19  * No traps on overflows for any of these...
  20  */
  21
  22 #define do_div64_32(res, high, low, base) ({ \
  23         unsigned long __quot32, __mod32; \
  24         unsigned long __cf, __tmp, __tmp2, __i; \
  25         \
  26         __asm__(".set   push\n\t" \
  27                 ".set   noat\n\t" \
  28                 ".set   noreorder\n\t" \
  29                 "move   %2, $0\n\t" \
  30                 "move   %3, $0\n\t" \
  31                 "b      1f\n\t" \
  32                 " li    %4, 0x21\n" \
  33                 "0:\n\t" \
  34                 "sll    $1, %0, 0x1\n\t" \
  35                 "srl    %3, %0, 0x1f\n\t" \
  36                 "or     %0, $1, %5\n\t" \
  37                 "sll    %1, %1, 0x1\n\t" \
  38                 "sll    %2, %2, 0x1\n" \
  39                 "1:\n\t" \
  40                 "bnez   %3, 2f\n\t" \
  41                 " sltu  %5, %0, %z6\n\t" \
  42                 "bnez   %5, 3f\n" \
  43                 "2:\n\t" \
  44                 " addiu %4, %4, -1\n\t" \
  45                 "subu   %0, %0, %z6\n\t" \
  46                 "addiu  %2, %2, 1\n" \
  47                 "3:\n\t" \
  48                 "bnez   %4, 0b\n\t" \
  49                 " srl   %5, %1, 0x1f\n\t" \
  50                 ".set   pop" \
  51                 : "=&r" (__mod32), "=&r" (__tmp), \
  52                   "=&r" (__quot32), "=&r" (__cf), \
  53                   "=&r" (__i), "=&r" (__tmp2) \
  54                 : "Jr" (base), "0" (high), "1" (low)); \
  55         \
  56         (res) = __quot32; \
  57         __mod32; })
  58
  59 #define do_div(n, base) ({ \
  60         unsigned long long __quot; \
  61         unsigned long __mod; \
  62         unsigned long long __div; \
  63         unsigned long __upper, __low, __high, __base; \
  64         \
  65         __div = (n); \
  66         __base = (base); \
  67         \
  68         __high = __div >> 32; \
  69         __low = __div; \
  70         __upper = __high; \
  71         \
  72         if (__high) \
  73                 __asm__("divu   $0, %z2, %z3" \
  74                         : "=h" (__upper), "=l" (__high) \
  75                         : "Jr" (__high), "Jr" (__base) \
  76                         : GCC_REG_ACCUM); \
  77         \
  78         __mod = do_div64_32(__low, __upper, __low, __base); \
  79         \
  80         __quot = __high; \
  81         __quot = __quot << 32 | __low; \
  82         (n) = __quot; \
  83         __mod; })
  84
  85 extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
  86 #endif /* (_MIPS_SZLONG == 32) */
  87
  88 #if (_MIPS_SZLONG == 64)
  89
  90 /*
  91  * Hey, we're already 64-bit, no
  92  * need to play games..
  93  */
  94 #define do_div(n, base) ({ \
  95         unsigned long __quot; \
  96         unsigned int __mod; \
  97         unsigned long __div; \
  98         unsigned int __base; \
  99         \
 100         __div = (n); \
 101         __base = (base); \
 102         \
 103         __mod = __div % __base; \
 104         __quot = __div / __base; \
 105         \
 106         (n) = __quot; \
 107         __mod; })
 108
 109 static inline uint64_t div64_64(uint64_t dividend, uint64_t divisor)
 110 {
 111         return dividend / divisor;
 112 }
 113
 114 #endif /* (_MIPS_SZLONG == 64) */
 115
 116 #endif /* _ASM_DIV64_H */