1 files changed, 55 insertions, 0 deletions
diff --git a/arch/i386/oprofile/nmi_timer_int.c b/arch/i386/oprofile/nmi_timer_int.c
new file mode 100644
index 000000000000..b2e462abf337
--- /dev/null
+++ b/arch/i386/oprofile/nmi_timer_int.c
@@ -0,0 +1,55 @@
+/**
+ * @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/irq.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_kernel();
+}
+
+
+int __init 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;
+}