OS-2366 ddi_periodic_add(9F) is entirely rubbish

*** 20,29 ****
--- 20,32 ----
   */
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
+ /*
+  * Copyright (c) 2013, Joyent, Inc.  All rights reserved.
+  */
  
  #include <sys/sysmacros.h>
  #include <sys/stack.h>
  #include <sys/cpuvar.h>
  #include <sys/ivintr.h>
*** 117,127 ****
          /*
           * Register these software interrupts for ddi timer.
           * Software interrupts up to the level 10 are supported.
           */
          for (i = DDI_IPL_1; i <= DDI_IPL_10; i++) {
!                 siron_inum[i-1] = add_softintr(i, (softintrfunc)timer_softintr,
                      (caddr_t)(uintptr_t)(i), SOFTINT_ST);
          }
  
          siron1_inum = add_softintr(PIL_1, softlevel1, 0, SOFTINT_ST);
          poke_cpu_inum = add_softintr(PIL_13, poke_cpu_intr, 0, SOFTINT_MT);
--- 120,131 ----
          /*
           * Register these software interrupts for ddi timer.
           * Software interrupts up to the level 10 are supported.
           */
          for (i = DDI_IPL_1; i <= DDI_IPL_10; i++) {
!                 siron_inum[i - 1] = add_softintr(i,
!                     (softintrfunc)ddi_periodic_softintr,
                      (caddr_t)(uintptr_t)(i), SOFTINT_ST);
          }
  
          siron1_inum = add_softintr(PIL_1, softlevel1, 0, SOFTINT_ST);
          poke_cpu_inum = add_softintr(PIL_13, poke_cpu_intr, 0, SOFTINT_MT);