/*
* Local APIC handling, local APIC timers
*
* (c) 1999, 2000 Ingo Molnar <mingo@redhat.com>
*
* Fixes
* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
* thanks to Eric Gilmore
* and Rolf G. Tews
* for testing these extensively.
* Maciej W. Rozycki : Various updates and fixes.
* Mikael Pettersson : Power Management for UP-APIC.
* Pavel Machek and
* Mikael Pettersson : PM converted to driver model.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/bootmem.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/kernel_stat.h>
#include <linux/sysdev.h>
#include <asm/atomic.h>
#include <asm/smp.h>
#include <asm/mtrr.h>
#include <asm/mpspec.h>
#include <asm/desc.h>
#include <asm/arch_hooks.h>
#include <asm/hpet.h>
#include <mach_apic.h>
#include "io_ports.h"
/*
* Debug level
*/
int apic_verbosity;
static void apic_pm_activate(void);
/*
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves.
*/
void ack_bad_irq(unsigned int irq)
{
printk("unexpected IRQ trap at vector %02x\n", irq);
/*
* Currently unexpected vectors happen only on SMP and APIC.
* We _must_ ack these because every local APIC has only N
* irq slots per priority level, and a 'hanging, unacked' IRQ
* holds up an irq slot - in excessive cases (when multiple
* unexpected vectors occur) that might lock up the APIC
* completely.
*/
ack_APIC_irq();
}
void __init apic_intr_init(void)
{
#ifdef CONFIG_SMP
smp_intr_init();
#endif
/* self generated IPI for local APIC timer */
set_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
/* IPI vectors for APIC spurious and error interrupts */
set_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
set_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
/* thermal monitor LVT interrupt */
#ifdef CONFIG_X86_MCE_P4THERMAL
set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
#endif
}
/* Using APIC to generate smp_local_timer_interrupt? */
int using_apic_timer = 0;
static DEFINE_PER_CPU(int, prof_multiplier) = 1;
static DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
static DEFINE_PER_CPU(int, prof_counter) = 1;
static int enabled_via_apicbase;
void enable_NMI_through_LVT0 (void * dummy)
{
unsigned int v, ver;
ver = apic_read(APIC_LVR);
ver = GET_APIC_VERSION(ver);
v = APIC_DM_NMI; /* unmask and set to NMI */
if (!APIC_INTEGRATED(ver)) /* 82489DX */
v |= APIC_LVT_LEVEL_TRIGGER;
apic_write_around(APIC_LVT0, v);
}
int get_physical_broadcast(void)
{
unsigned int lvr, version;
lvr = apic_read(APIC_LVR);
version = GET_APIC_VERSION(lvr);
if (!APIC_INTEGRATED(version) || version >= 0x14)
return 0xff;
else
return 0xf;
}
int get_maxlvt(void)
{
unsigned int v, ver, maxlvt;
v = apic_read(APIC_LVR);