arch/sparc/kernel/tick14.c

   1 /* tick14.c
   2  *
   3  * Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
   4  *
   5  * This file handles the Sparc specific level14 ticker
   6  * This is really useful for profiling OBP uses it for keyboard
   7  * aborts and other stuff.
   8  */
   9 #include <linux/kernel.h>
  10
  11 extern unsigned long lvl14_save[5];
  12 static unsigned long *linux_lvl14 = NULL;
  13 static unsigned long obp_lvl14[4];
  14
  15 /*
  16  * Call with timer IRQ closed.
  17  * First time we do it with disable_irq, later prom code uses spin_lock_irq().
  18  */
  19 void install_linux_ticker(void)
  20 {
  21
  22         if (!linux_lvl14)
  23                 return;
  24         linux_lvl14[0] =  lvl14_save[0];
  25         linux_lvl14[1] =  lvl14_save[1];
  26         linux_lvl14[2] =  lvl14_save[2];
  27         linux_lvl14[3] =  lvl14_save[3];
  28 }
  29
  30 void install_obp_ticker(void)
  31 {
  32
  33         if (!linux_lvl14)
  34                 return;
  35         linux_lvl14[0] =  obp_lvl14[0];
  36         linux_lvl14[1] =  obp_lvl14[1];
  37         linux_lvl14[2] =  obp_lvl14[2];
  38         linux_lvl14[3] =  obp_lvl14[3];
  39 }