/* $Id: x86_setup.c,v 1.47.2.9 2009/01/23 17:21:20 mikpe Exp $

 * Performance-monitoring counters driver.

 * x86/x86_64-specific kernel-resident code.

 *

 * Copyright (C) 1999-2007, 2009  Mikael Pettersson

 */

#include <linux/version.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)

#include <linux/config.h>

#endif

#include <linux/module.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <asm/processor.h>

#include <asm/perfctr.h>

#include <asm/fixmap.h>

#include <asm/apic.h>

#include "x86_compat.h"

#include "compat.h"

#ifdef CONFIG_X86_LOCAL_APIC

static void perfctr_default_ihandler(unsigned long pc)

{

}

static perfctr_ihandler_t perfctr_ihandler = perfctr_default_ihandler;

static unsigned int interrupts_masked[NR_CPUS] __cacheline_aligned;

void __perfctr_cpu_mask_interrupts(void)

{

	interrupts_masked[smp_processor_id()] = 1;

}

void __perfctr_cpu_unmask_interrupts(void)

{

	interrupts_masked[smp_processor_id()] = 0;

}

asmlinkage void smp_perfctr_interrupt(struct pt_regs *regs)

{

	/* PREEMPT note: invoked via an interrupt gate, which

	   masks interrupts. We're still on the originating CPU. */

	/* XXX: recursive interrupts? delay the ACK, mask LVTPC, or queue? */

	ack_APIC_irq();

	if (interrupts_masked[smp_processor_id()])

		return;

	irq_enter();

	(*perfctr_ihandler)(instruction_pointer(regs));

	irq_exit();

}

void perfctr_cpu_set_ihandler(perfctr_ihandler_t ihandler)

{

	perfctr_ihandler = ihandler ? ihandler : perfctr_default_ihandler;

}

#endif

#if defined(__x86_64__) || LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)

extern unsigned int cpu_khz;

#else

extern unsigned long cpu_khz;

#endif

unsigned int perfctr_cpu_khz(void)

{

	return cpu_khz;

}

#ifdef CONFIG_PERFCTR_MODULE

EXPORT_SYMBOL_mmu_cr4_features;

EXPORT_SYMBOL(perfctr_cpu_khz);

#ifdef CONFIG_X86_LOCAL_APIC

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)

#include <asm/nmi.h>

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)

EXPORT_SYMBOL(disable_lapic_nmi_watchdog);

EXPORT_SYMBOL(enable_lapic_nmi_watchdog);

#else

EXPORT_SYMBOL(setup_apic_nmi_watchdog);

EXPORT_SYMBOL(stop_apic_nmi_watchdog);

#endif

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,6)

EXPORT_SYMBOL(nmi_perfctr_msr);

#endif

EXPORT_SYMBOL(__perfctr_cpu_mask_interrupts);

EXPORT_SYMBOL(__perfctr_cpu_unmask_interrupts);

EXPORT_SYMBOL(perfctr_cpu_set_ihandler);

#endif /* CONFIG_X86_LOCAL_APIC */

#endif /* MODULE */