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/**
* @file init.c
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
*/
#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/errno.h>
/*
* We support CPUs that have performance counters like the Pentium Pro
* with the NMI mode driver.
*/
extern int op_nmi_init(struct oprofile_operations *ops);
extern int op_nmi_timer_init(struct oprofile_operations *ops);
extern void op_nmi_exit(void);
extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
static int nmi_timer;
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
int ret;
ret = -ENODEV;
#ifdef CONFIG_X86_LOCAL_APIC
ret = op_nmi_init(ops);
#endif
nmi_timer = (ret != 0);
#ifdef CONFIG_X86_IO_APIC
if (nmi_timer)
ret = op_nmi_timer_init(ops);
#endif
ops->backtrace = x86_backtrace;
return ret;
}
void oprofile_arch_exit(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
if (!nmi_timer)
op_nmi_exit();
#endif
}
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