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-rw-r--r--arch/i386/oprofile/nmi_timer_int.c55
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 00000000000..b2e462abf33
--- /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;
+}