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/**
* @file nmi_timer_int.c
*
* @remark Copyright 2003 OProfile authors
* @remark Read the file COPYING
*
* @author Zwane Mwaikambo <zwane@linuxpower.ca>
*/
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/oprofile.h>
#include <linux/rcupdate.h>
#include <asm/nmi.h>
#include <asm/apic.h>
#include <asm/ptrace.h>
static int nmi_timer_callback(struct pt_regs * regs, int cpu)
{
oprofile_add_sample(regs, 0);
return 1;
}
static int timer_start(void)
{
disable_timer_nmi_watchdog();
set_nmi_callback(nmi_timer_callback);
return 0;
}
static void timer_stop(void)
{
enable_timer_nmi_watchdog();
unset_nmi_callback();
synchronize_sched(); /* Allow already-started NMIs to complete. */
}
int __init op_nmi_timer_init(struct oprofile_operations * ops)
{
extern int nmi_active;
if (nmi_active <= 0)
return -ENODEV;
ops->start = timer_start;
ops->stop = timer_stop;
ops->cpu_type = "timer";
printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
return 0;
}
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