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