Problem with making a device driver for Virtex 4 PowerPC

[priestnot]

Hi there...

I am trying to make a device driver (Kernel module) for a Virtex4 PowerPC, and i have a small problem...

The powerpc is byte addressable (little endian) but i my kernel functions as to return a int (32bit's) i already have a functional module but is not optimized

ssize_t fpga_write(struct file *filp, int *buf, size_t count, loff_t *f_pos) 
{
	void *add;
	int *kbuf;
    	kbuf = kmalloc(count, GFP_KERNEL);
	int ret = copy_from_user(kbuf, buf, count);
	int i;
	for(i = *f_pos/4; i < count/4 + *f_pos/4; i++)
	{
  
  add = io_base + (i*4);
  __raw_writel(kbuf[i - *f_pos], add);
	}
	kfree(kbuf);
  	return 1;

}

What i wold like to do is get a int without making the * and / (they take lot of CPU time). I think there is a way with some masks with FFFFFFFC using a AND. Is this possible i do not understand how it works...


does anyone have any ideas??