The asm for mtsrin looks backwards to me.  For example, osfmk uses:

unsigned int kernel_seg_regs[] = {
	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

__inline__ void mtsrin(unsigned int val, unsigned int reg)
{
        __asm__ volatile("mtsrin %0, %1" : : "r" (val), "r" (reg));
        return;
}

/* ... */
	for (i=0; i<16; i++) {
		mtsrin(kernel_seg_regs[i], i * 0x10000000);
	}
/* ... */

David
===============================================================================
David Edelsohn                                      T.J. Watson Research Center
dje@watson.ibm.com                                  P.O. Box 218
+1 914 945 4364 (TL 862)                            Yorktown Heights, NY 10598