1 /**
2  * @file init.c
3  *
4  * @remark Copyright 2002 OProfile authors
5  * @remark Read the file COPYING
6  *
7  * @author John Levon <levon@movementarian.org>
8  */
9 
10 #include <linux/oprofile.h>
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 
14 /*
15  * We support CPUs that have performance counters like the Pentium Pro
16  * with the NMI mode driver.
17  */
18 
19 extern int op_nmi_init(struct oprofile_operations *ops);
20 extern int op_nmi_timer_init(struct oprofile_operations *ops);
21 extern void op_nmi_exit(void);
22 extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
23 
24 
oprofile_arch_init(struct oprofile_operations * ops)25 int __init oprofile_arch_init(struct oprofile_operations *ops)
26 {
27 	int ret;
28 
29 	ret = -ENODEV;
30 
31 #ifdef CONFIG_X86_LOCAL_APIC
32 	ret = op_nmi_init(ops);
33 #endif
34 #ifdef CONFIG_X86_IO_APIC
35 	if (ret < 0)
36 		ret = op_nmi_timer_init(ops);
37 #endif
38 	ops->backtrace = x86_backtrace;
39 
40 	return ret;
41 }
42 
43 
oprofile_arch_exit(void)44 void oprofile_arch_exit(void)
45 {
46 #ifdef CONFIG_X86_LOCAL_APIC
47 	op_nmi_exit();
48 #endif
49 }
50