/*
   * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
   *
   * Based on former do_div() implementation from asm-parisc/div64.h:
   *	Copyright (C) 1999 Hewlett-Packard Co
   *	Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
   *
   *
   * Generic C version of 64bit/32bit division and modulo, with
   * 64bit result and 32bit remainder.
   *
   * The fast case for (n>>32 == 0) is handled inline by do_div(). 
   *
   * Code generated for this function might be very inefficient
   * for some CPUs. __div64_32() can be overridden by linking arch-specific
   * assembly versions such as arch/ppc/lib/div64.S and arch/sh/lib/div64.S.
   */
  
  #include <linux/types.h>
  #include <linux/module.h>
  #include <asm/div64.h>
  
  /* Not needed on 64bit architectures */
  #if BITS_PER_LONG == 32

  uint32_t __attribute__((weak)) __div64_32(uint64_t *n, uint32_t base)

  {
  	uint64_t rem = *n;
  	uint64_t b = base;
  	uint64_t res, d = 1;
  	uint32_t high = rem >> 32;
  
  	/* Reduce the thing a bit first */
  	res = 0;
  	if (high >= base) {
  		high /= base;
  		res = (uint64_t) high << 32;
  		rem -= (uint64_t) (high*base) << 32;
  	}
  
  	while ((int64_t)b > 0 && b < rem) {
  		b = b+b;
  		d = d+d;
  	}
  
  	do {
  		if (rem >= b) {
  			rem -= b;
  			res += d;
  		}
  		b >>= 1;
  		d >>= 1;
  	} while (d);
  
  	*n = res;
  	return rem;
  }
  
  EXPORT_SYMBOL(__div64_32);

  /* 64bit divisor, dividend and result. dynamic precision */
  uint64_t div64_64(uint64_t dividend, uint64_t divisor)
  {

  	uint32_t high, d;

  	high = divisor >> 32;
  	if (high) {
  		unsigned int shift = fls(high);

  
  		d = divisor >> shift;
  		dividend >>= shift;

  	} else
  		d = divisor;

  	do_div(dividend, d);

  
  	return dividend;
  }
  EXPORT_SYMBOL(div64_64);

  #endif /* BITS_PER_LONG == 32 */