2 * linux/arch/sparc/kernel/tick14.c
4 * Copyright (C) 1996 David Redman (djhr@tadpole.co.uk)
6 * This file handles the Sparc specific level14 ticker
7 * This is really useful for profiling OBP uses it for keyboard
8 * aborts and other stuff.
12 #include <linux/errno.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/param.h>
16 #include <linux/string.h>
18 #include <linux/timex.h>
19 #include <linux/interrupt.h>
21 #include <asm/oplib.h>
22 #include <asm/timer.h>
23 #include <asm/mostek.h>
24 #include <asm/system.h>
30 extern unsigned long lvl14_save[5];
31 static unsigned long *linux_lvl14 = NULL;
32 static unsigned long obp_lvl14[4];
35 * Call with timer IRQ closed.
36 * First time we do it with disable_irq, later prom code uses spin_lock_irq().
38 void install_linux_ticker(void)
43 linux_lvl14[0] = lvl14_save[0];
44 linux_lvl14[1] = lvl14_save[1];
45 linux_lvl14[2] = lvl14_save[2];
46 linux_lvl14[3] = lvl14_save[3];
49 void install_obp_ticker(void)
54 linux_lvl14[0] = obp_lvl14[0];
55 linux_lvl14[1] = obp_lvl14[1];
56 linux_lvl14[2] = obp_lvl14[2];
57 linux_lvl14[3] = obp_lvl14[3];
60 void claim_ticker14(irq_handler_t handler,
61 int irq_nr, unsigned int timeout )
63 int cpu = smp_processor_id();
65 /* first we copy the obp handler instructions
71 linux_lvl14 = (unsigned long *)lvl14_save[4];
72 obp_lvl14[0] = linux_lvl14[0];
73 obp_lvl14[1] = linux_lvl14[1];
74 obp_lvl14[2] = linux_lvl14[2];
75 obp_lvl14[3] = linux_lvl14[3];
77 if (!request_irq(irq_nr,
79 (IRQF_DISABLED | SA_STATIC_ALLOC),
82 install_linux_ticker();
83 load_profile_irq(cpu, timeout);