x86: prepare merging arch/x86/kernel/apic_32/64.c

Shuffle code around, so we get a readable diff.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 596 insertions, 529 deletions

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 3a069acb270c..420c15842e44 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -563,6 +563,9 @@ static void local_apic_timer_interrupt(void)
                 return;
         }
 
+        /*
+         * the NMI deadlock-detector uses this.
+         */
         per_cpu(irq_stat, cpu).apic_timer_irqs++;
 
         evt->event_handler(evt);
@@ -617,7 +620,7 @@ int setup_profiling_timer(unsigned int multiplier)
 void clear_local_APIC(void)
 {
         int maxlvt = lapic_get_maxlvt();
-        unsigned long v;
+        u32 v;
 
         /*
          * Masking an LVT entry can trigger a local APIC error
@@ -1210,50 +1213,6 @@ int __init APIC_init_uniprocessor (void)
 }
 
 /*
- * APIC command line parameters
- */
-static int __init parse_lapic(char *arg)
-{
-        enable_local_apic = 1;
-        return 0;
-}
-early_param("lapic", parse_lapic);
-
-static int __init parse_nolapic(char *arg)
-{
-        enable_local_apic = -1;
-        clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
-        return 0;
-}
-early_param("nolapic", parse_nolapic);
-
-static int __init parse_disable_lapic_timer(char *arg)
-{
-        local_apic_timer_disabled = 1;
-        return 0;
-}
-early_param("nolapic_timer", parse_disable_lapic_timer);
-
-static int __init parse_lapic_timer_c2_ok(char *arg)
-{
-        local_apic_timer_c2_ok = 1;
-        return 0;
-}
-early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
-
-static int __init apic_set_verbosity(char *str)
-{
-        if (strcmp("debug", str) == 0)
-                apic_verbosity = APIC_DEBUG;
-        else if (strcmp("verbose", str) == 0)
-                apic_verbosity = APIC_VERBOSE;
-        return 1;
-}
-
-__setup("apic=", apic_set_verbosity);
-
-
-/*
  * Local APIC interrupts
  */
 
@@ -1565,3 +1524,46 @@ device_initcall(init_lapic_sysfs);
 static void apic_pm_activate(void) { }
 
 #endif  /* CONFIG_PM */
+
+/*
+ * APIC command line parameters
+ */
+static int __init parse_lapic(char *arg)
+{
+        enable_local_apic = 1;
+        return 0;
+}
+early_param("lapic", parse_lapic);
+
+static int __init parse_nolapic(char *arg)
+{
+        enable_local_apic = -1;
+        clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
+        return 0;
+}
+early_param("nolapic", parse_nolapic);
+
+static int __init parse_disable_lapic_timer(char *arg)
+{
+        local_apic_timer_disabled = 1;
+        return 0;
+}
+early_param("nolapic_timer", parse_disable_lapic_timer);
+
+static int __init parse_lapic_timer_c2_ok(char *arg)
+{
+        local_apic_timer_c2_ok = 1;
+        return 0;
+}
+early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
+
+static int __init apic_set_verbosity(char *str)
+{
+        if (strcmp("debug", str) == 0)
+                apic_verbosity = APIC_DEBUG;
+        else if (strcmp("verbose", str) == 0)
+                apic_verbosity = APIC_VERBOSE;
+        return 1;
+}
+__setup("apic=", apic_set_verbosity);
+
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 5bf329ed9d78..915808bd8a2a 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -44,6 +44,7 @@
 int apic_verbosity;
 int disable_apic_timer __cpuinitdata;
 static int apic_calibrate_pmtmr __initdata;
+int disable_apic;
 
 /* Local APIC timer works in C2? */
 int local_apic_timer_c2_ok;
@@ -60,10 +61,8 @@ static int lapic_next_event(unsigned long delta,
                             struct clock_event_device *evt);
 static void lapic_timer_setup(enum clock_event_mode mode,
                               struct clock_event_device *evt);
-
 static void lapic_timer_broadcast(cpumask_t mask);
-
-static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen);
+static void apic_pm_activate(void);
 
 static struct clock_event_device lapic_clockevent = {
         .name           = "lapic",
@@ -78,6 +77,130 @@ static struct clock_event_device lapic_clockevent = {
 };
 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
 
+/*
+ * Get the LAPIC version
+ */
+static inline int lapic_get_version(void)
+{
+        return GET_APIC_VERSION(apic_read(APIC_LVR));
+}
+
+/*
+ * Check, if the APIC is integrated or a seperate chip
+ */
+static inline int lapic_is_integrated(void)
+{
+        return 1;
+}
+
+/*
+ * Check, whether this is a modern or a first generation APIC
+ */
+static int modern_apic(void)
+{
+        /* AMD systems use old APIC versions, so check the CPU */
+        if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+            boot_cpu_data.x86 >= 0xf)
+                return 1;
+        return lapic_get_version() >= 0x14;
+}
+
+void apic_wait_icr_idle(void)
+{
+        while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
+                cpu_relax();
+}
+
+u32 safe_apic_wait_icr_idle(void)
+{
+        u32 send_status;
+        int timeout;
+
+        timeout = 0;
+        do {
+                send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
+                if (!send_status)
+                        break;
+                udelay(100);
+        } while (timeout++ < 1000);
+
+        return send_status;
+}
+
+/**
+ * enable_NMI_through_LVT0 - enable NMI through local vector table 0
+ */
+void enable_NMI_through_LVT0(void *dummy)
+{
+        unsigned int v;
+
+        /* unmask and set to NMI */
+        v = APIC_DM_NMI;
+        apic_write(APIC_LVT0, v);
+}
+
+/**
+ * lapic_get_maxlvt - get the maximum number of local vector table entries
+ */
+int lapic_get_maxlvt(void)
+{
+        unsigned int v, maxlvt;
+
+        v = apic_read(APIC_LVR);
+        maxlvt = GET_APIC_MAXLVT(v);
+        return maxlvt;
+}
+
+/*
+ * This function sets up the local APIC timer, with a timeout of
+ * 'clocks' APIC bus clock. During calibration we actually call
+ * this function twice on the boot CPU, once with a bogus timeout
+ * value, second time for real. The other (noncalibrating) CPUs
+ * call this function only once, with the real, calibrated value.
+ *
+ * We do reads before writes even if unnecessary, to get around the
+ * P5 APIC double write bug.
+ */
+
+static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
+{
+        unsigned int lvtt_value, tmp_value;
+
+        lvtt_value = LOCAL_TIMER_VECTOR;
+        if (!oneshot)
+                lvtt_value |= APIC_LVT_TIMER_PERIODIC;
+        if (!irqen)
+                lvtt_value |= APIC_LVT_MASKED;
+
+        apic_write(APIC_LVTT, lvtt_value);
+
+        /*
+         * Divide PICLK by 16
+         */
+        tmp_value = apic_read(APIC_TDCR);
+        apic_write(APIC_TDCR, (tmp_value
+                                & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE))
+                                | APIC_TDR_DIV_16);
+
+        if (!oneshot)
+                apic_write(APIC_TMICT, clocks);
+}
+
+/*
+ * Setup extended LVT (K8 specific)
+ */
+void setup_APIC_extended_lvt(unsigned char lvt_off, unsigned char vector,
+                             unsigned char msg_type, unsigned char mask)
+{
+        unsigned long reg = (lvt_off << 4) + K8_APIC_EXT_LVT_BASE;
+        unsigned int  v   = (mask << 16) | (msg_type << 8) | vector;
+
+        apic_write(reg, v);
+}
+
+/*
+ * Program the next event, relative to now
+ */
 static int lapic_next_event(unsigned long delta,
                             struct clock_event_device *evt)
 {
@@ -85,6 +208,9 @@ static int lapic_next_event(unsigned long delta,
         return 0;
 }
 
+/*
+ * Setup the lapic timer in periodic or oneshot mode
+ */
 static void lapic_timer_setup(enum clock_event_mode mode,
                               struct clock_event_device *evt)
 {
@@ -127,54 +253,236 @@ static void lapic_timer_broadcast(cpumask_t mask)
 #endif
 }
 
-static void apic_pm_activate(void);
+/*
+ * Setup the local APIC timer for this CPU. Copy the initilized values
+ * of the boot CPU and register the clock event in the framework.
+ */
+static void setup_APIC_timer(void)
+{
+        struct clock_event_device *levt = &__get_cpu_var(lapic_events);
 
-void apic_wait_icr_idle(void)
+        memcpy(levt, &lapic_clockevent, sizeof(*levt));
+        levt->cpumask = cpumask_of_cpu(smp_processor_id());
+
+        clockevents_register_device(levt);
+}
+
+/*
+ * In this function we calibrate APIC bus clocks to the external
+ * timer. Unfortunately we cannot use jiffies and the timer irq
+ * to calibrate, since some later bootup code depends on getting
+ * the first irq? Ugh.
+ *
+ * We want to do the calibration only once since we
+ * want to have local timer irqs syncron. CPUs connected
+ * by the same APIC bus have the very same bus frequency.
+ * And we want to have irqs off anyways, no accidental
+ * APIC irq that way.
+ */
+
+#define TICK_COUNT 100000000
+
+static void __init calibrate_APIC_clock(void)
 {
-        while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
-                cpu_relax();
+        unsigned apic, apic_start;
+        unsigned long tsc, tsc_start;
+        int result;
+
+        local_irq_disable();
+
+        /*
+         * Put whatever arbitrary (but long enough) timeout
+         * value into the APIC clock, we just want to get the
+         * counter running for calibration.
+         *
+         * No interrupt enable !
+         */
+        __setup_APIC_LVTT(250000000, 0, 0);
+
+        apic_start = apic_read(APIC_TMCCT);
+#ifdef CONFIG_X86_PM_TIMER
+        if (apic_calibrate_pmtmr && pmtmr_ioport) {
+                pmtimer_wait(5000);  /* 5ms wait */
+                apic = apic_read(APIC_TMCCT);
+                result = (apic_start - apic) * 1000L / 5;
+        } else
+#endif
+        {
+                rdtscll(tsc_start);
+
+                do {
+                        apic = apic_read(APIC_TMCCT);
+                        rdtscll(tsc);
+                } while ((tsc - tsc_start) < TICK_COUNT &&
+                                (apic_start - apic) < TICK_COUNT);
+
+                result = (apic_start - apic) * 1000L * tsc_khz /
+                                        (tsc - tsc_start);
+        }
+
+        local_irq_enable();
+
+        printk(KERN_DEBUG "APIC timer calibration result %d\n", result);
+
+        printk(KERN_INFO "Detected %d.%03d MHz APIC timer.\n",
+                result / 1000 / 1000, result / 1000 % 1000);
+
+        /* Calculate the scaled math multiplication factor */
+        lapic_clockevent.mult = div_sc(result, NSEC_PER_SEC, 32);
+        lapic_clockevent.max_delta_ns =
+                clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
+        lapic_clockevent.min_delta_ns =
+                clockevent_delta2ns(0xF, &lapic_clockevent);
+
+        calibration_result = result / HZ;
 }
 
-u32 safe_apic_wait_icr_idle(void)
+void __init setup_boot_APIC_clock(void)
 {
-        u32 send_status;
-        int timeout;
+        /*
+         * The local apic timer can be disabled via the kernel commandline.
+         * Register the lapic timer as a dummy clock event source on SMP
+         * systems, so the broadcast mechanism is used. On UP systems simply
+         * ignore it.
+         */
+        if (disable_apic_timer) {
+                printk(KERN_INFO "Disabling APIC timer\n");
+                /* No broadcast on UP ! */
+                if (num_possible_cpus() > 1)
+                        setup_APIC_timer();
+                return;
+        }
 
-        timeout = 0;
-        do {
-                send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
-                if (!send_status)
-                        break;
-                udelay(100);
-        } while (timeout++ < 1000);
+        printk(KERN_INFO "Using local APIC timer interrupts.\n");
+        calibrate_APIC_clock();
 
-        return send_status;
+        /*
+         * If nmi_watchdog is set to IO_APIC, we need the
+         * PIT/HPET going.  Otherwise register lapic as a dummy
+         * device.
+         */
+        if (nmi_watchdog != NMI_IO_APIC)
+                lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
+        else
+                printk(KERN_WARNING "APIC timer registered as dummy,"
+                       " due to nmi_watchdog=1!\n");
+
+        setup_APIC_timer();
 }
 
-void enable_NMI_through_LVT0 (void * dummy)
+/*
+ * AMD C1E enabled CPUs have a real nasty problem: Some BIOSes set the
+ * C1E flag only in the secondary CPU, so when we detect the wreckage
+ * we already have enabled the boot CPU local apic timer. Check, if
+ * disable_apic_timer is set and the DUMMY flag is cleared. If yes,
+ * set the DUMMY flag again and force the broadcast mode in the
+ * clockevents layer.
+ */
+void __cpuinit check_boot_apic_timer_broadcast(void)
 {
-        unsigned int v;
+        if (!disable_apic_timer ||
+            (lapic_clockevent.features & CLOCK_EVT_FEAT_DUMMY))
+                return;
 
-        /* unmask and set to NMI */
-        v = APIC_DM_NMI;
-        apic_write(APIC_LVT0, v);
+        printk(KERN_INFO "AMD C1E detected late. Force timer broadcast.\n");
+        lapic_clockevent.features |= CLOCK_EVT_FEAT_DUMMY;
+
+        local_irq_enable();
+        clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_FORCE, &boot_cpu_id);
+        local_irq_disable();
 }
 
-int lapic_get_maxlvt(void)
+void __cpuinit setup_secondary_APIC_clock(void)
 {
-        unsigned int v, maxlvt;
+        check_boot_apic_timer_broadcast();
+        setup_APIC_timer();
+}
 
-        v = apic_read(APIC_LVR);
-        maxlvt = GET_APIC_MAXLVT(v);
-        return maxlvt;
+/*
+ * The guts of the apic timer interrupt
+ */
+static void local_apic_timer_interrupt(void)
+{
+        int cpu = smp_processor_id();
+        struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
+
+        /*
+         * Normally we should not be here till LAPIC has been initialized but
+         * in some cases like kdump, its possible that there is a pending LAPIC
+         * timer interrupt from previous kernel's context and is delivered in
+         * new kernel the moment interrupts are enabled.
+         *
+         * Interrupts are enabled early and LAPIC is setup much later, hence
+         * its possible that when we get here evt->event_handler is NULL.
+         * Check for event_handler being NULL and discard the interrupt as
+         * spurious.
+         */
+        if (!evt->event_handler) {
+                printk(KERN_WARNING
+                       "Spurious LAPIC timer interrupt on cpu %d\n", cpu);
+                /* Switch it off */
+                lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt);
+                return;
+        }
+
+        /*
+         * the NMI deadlock-detector uses this.
+         */
+        add_pda(apic_timer_irqs, 1);
+
+        evt->event_handler(evt);
 }
 
-void clear_local_APIC(void)
+/*
+ * Local APIC timer interrupt. This is the most natural way for doing
+ * local interrupts, but local timer interrupts can be emulated by
+ * broadcast interrupts too. [in case the hw doesn't support APIC timers]
+ *
+ * [ if a single-CPU system runs an SMP kernel then we call the local
+ *   interrupt as well. Thus we cannot inline the local irq ... ]
+ */
+void smp_apic_timer_interrupt(struct pt_regs *regs)
 {
-        int maxlvt;
-        unsigned int v;
+        struct pt_regs *old_regs = set_irq_regs(regs);
 
-        maxlvt = lapic_get_maxlvt();
+        /*
+         * NOTE! We'd better ACK the irq immediately,
+         * because timer handling can be slow.
+         */
+        ack_APIC_irq();
+        /*
+         * update_process_times() expects us to have done irq_enter().
+         * Besides, if we don't timer interrupts ignore the global
+         * interrupt lock, which is the WrongThing (tm) to do.
+         */
+        exit_idle();
+        irq_enter();
+        local_apic_timer_interrupt();
+        irq_exit();
+        set_irq_regs(old_regs);
+}
+
+int setup_profiling_timer(unsigned int multiplier)
+{
+        return -EINVAL;
+}
+
+
+/*
+ * Local APIC start and shutdown
+ */
+
+/**
+ * clear_local_APIC - shutdown the local APIC
+ *
+ * This is called, when a CPU is disabled and before rebooting, so the state of
+ * the local APIC has no dangling leftovers. Also used to cleanout any BIOS
+ * leftovers during boot.
+ */
+void clear_local_APIC(void)
+{
+        int maxlvt = lapic_get_maxlvt();
+        u32 v;
 
         /*
          * Masking an LVT entry can trigger a local APIC error
@@ -213,45 +521,9 @@ void clear_local_APIC(void)
         apic_read(APIC_ESR);
 }
 
-void disconnect_bsp_APIC(int virt_wire_setup)
-{
-        /* Go back to Virtual Wire compatibility mode */
-        unsigned long value;
-
-        /* For the spurious interrupt use vector F, and enable it */
-        value = apic_read(APIC_SPIV);
-        value &= ~APIC_VECTOR_MASK;
-        value |= APIC_SPIV_APIC_ENABLED;
-        value |= 0xf;
-        apic_write(APIC_SPIV, value);
-
-        if (!virt_wire_setup) {
-                /*
-                 * For LVT0 make it edge triggered, active high,
-                 * external and enabled
-                 */
-                value = apic_read(APIC_LVT0);
-                value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
-                        APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
-                        APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED );
-                value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
-                value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
-                apic_write(APIC_LVT0, value);
-        } else {
-                /* Disable LVT0 */
-                apic_write(APIC_LVT0, APIC_LVT_MASKED);
-        }
-
-        /* For LVT1 make it edge triggered, active high, nmi and enabled */
-        value = apic_read(APIC_LVT1);
-        value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
-                        APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
-                        APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
-        value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
-        value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
-        apic_write(APIC_LVT1, value);
-}
-
+/**
+ * disable_local_APIC - clear and disable the local APIC
+ */
 void disable_local_APIC(void)
 {
         unsigned int value;
@@ -335,18 +607,20 @@ int __init verify_local_APIC(void)
          * compatibility mode, but most boxes are anymore.
          */
         reg0 = apic_read(APIC_LVT0);
-        apic_printk(APIC_DEBUG,"Getting LVT0: %x\n", reg0);
+        apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0);
         reg1 = apic_read(APIC_LVT1);
         apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1);
 
         return 1;
 }
 
+/**
+ * sync_Arb_IDs - synchronize APIC bus arbitration IDs
+ */
 void __init sync_Arb_IDs(void)
 {
         /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 */
-        unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
-        if (ver >= 0x14)        /* P4 or higher */
+        if (modern_apic())
                 return;
 
         /*
@@ -398,7 +672,10 @@ void __init init_bsp_APIC(void)
         apic_write(APIC_LVT1, value);
 }
 
-void __cpuinit setup_local_APIC (void)
+/**
+ * setup_local_APIC - setup the local APIC
+ */
+void __cpuinit setup_local_APIC(void)
 {
         unsigned int value, maxlvt;
         int i, j;
@@ -520,6 +797,188 @@ void __cpuinit setup_local_APIC (void)
         apic_pm_activate();
 }
 
+/*
+ * Detect and enable local APICs on non-SMP boards.
+ * Original code written by Keir Fraser.
+ * On AMD64 we trust the BIOS - if it says no APIC it is likely
+ * not correctly set up (usually the APIC timer won't work etc.)
+ */
+static int __init detect_init_APIC(void)
+{
+        if (!cpu_has_apic) {
+                printk(KERN_INFO "No local APIC present\n");
+                return -1;
+        }
+
+        mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
+        boot_cpu_id = 0;
+        return 0;
+}
+
+/**
+ * init_apic_mappings - initialize APIC mappings
+ */
+void __init init_apic_mappings(void)
+{
+        unsigned long apic_phys;
+
+        /*
+         * If no local APIC can be found then set up a fake all
+         * zeroes page to simulate the local APIC and another
+         * one for the IO-APIC.
+         */
+        if (!smp_found_config && detect_init_APIC()) {
+                apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+                apic_phys = __pa(apic_phys);
+        } else
+                apic_phys = mp_lapic_addr;
+
+        set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
+        apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
+                                APIC_BASE, apic_phys);
+
+        /* Put local APIC into the resource map. */
+        lapic_resource.start = apic_phys;
+        lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
+        insert_resource(&iomem_resource, &lapic_resource);
+
+        /*
+         * Fetch the APIC ID of the BSP in case we have a
+         * default configuration (or the MP table is broken).
+         */
+        boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
+}
+
+/*
+ * This initializes the IO-APIC and APIC hardware if this is
+ * a UP kernel.
+ */
+int __init APIC_init_uniprocessor(void)
+{
+        if (disable_apic) {
+                printk(KERN_INFO "Apic disabled\n");
+                return -1;
+        }
+        if (!cpu_has_apic) {
+                disable_apic = 1;
+                printk(KERN_INFO "Apic disabled by BIOS\n");
+                return -1;
+        }
+
+        verify_local_APIC();
+
+        phys_cpu_present_map = physid_mask_of_physid(boot_cpu_id);
+        apic_write(APIC_ID, SET_APIC_ID(boot_cpu_id));
+
+        setup_local_APIC();
+
+        if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
+                setup_IO_APIC();
+        else
+                nr_ioapics = 0;
+        setup_boot_APIC_clock();
+        check_nmi_watchdog();
+        return 0;
+}
+
+/*
+ * Local APIC interrupts
+ */
+
+/*
+ * This interrupt should _never_ happen with our APIC/SMP architecture
+ */
+asmlinkage void smp_spurious_interrupt(void)
+{
+        unsigned int v;
+        exit_idle();
+        irq_enter();
+        /*
+         * Check if this really is a spurious interrupt and ACK it
+         * if it is a vectored one.  Just in case...
+         * Spurious interrupts should not be ACKed.
+         */
+        v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
+        if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
+                ack_APIC_irq();
+
+        add_pda(irq_spurious_count, 1);
+        irq_exit();
+}
+
+/*
+ * This interrupt should never happen with our APIC/SMP architecture
+ */
+asmlinkage void smp_error_interrupt(void)
+{
+        unsigned int v, v1;
+
+        exit_idle();
+        irq_enter();
+        /* First tickle the hardware, only then report what went on. -- REW */
+        v = apic_read(APIC_ESR);
+        apic_write(APIC_ESR, 0);
+        v1 = apic_read(APIC_ESR);
+        ack_APIC_irq();
+        atomic_inc(&irq_err_count);
+
+        /* Here is what the APIC error bits mean:
+           0: Send CS error
+           1: Receive CS error
+           2: Send accept error
+           3: Receive accept error
+           4: Reserved
+           5: Send illegal vector
+           6: Received illegal vector
+           7: Illegal register address
+        */
+        printk(KERN_DEBUG "APIC error on CPU%d: %02x(%02x)\n",
+                smp_processor_id(), v , v1);
+        irq_exit();
+}
+
+void disconnect_bsp_APIC(int virt_wire_setup)
+{
+        /* Go back to Virtual Wire compatibility mode */
+        unsigned long value;
+
+        /* For the spurious interrupt use vector F, and enable it */
+        value = apic_read(APIC_SPIV);
+        value &= ~APIC_VECTOR_MASK;
+        value |= APIC_SPIV_APIC_ENABLED;
+        value |= 0xf;
+        apic_write(APIC_SPIV, value);
+
+        if (!virt_wire_setup) {
+                /*
+                 * For LVT0 make it edge triggered, active high,
+                 * external and enabled
+                 */
+                value = apic_read(APIC_LVT0);
+                value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
+                        APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+                        APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
+                value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+                value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
+                apic_write(APIC_LVT0, value);
+        } else {
+                /* Disable LVT0 */
+                apic_write(APIC_LVT0, APIC_LVT_MASKED);
+        }
+
+        /* For LVT1 make it edge triggered, active high, nmi and enabled */
+        value = apic_read(APIC_LVT1);
+        value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
+                        APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+                        APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
+        value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+        value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
+        apic_write(APIC_LVT1, value);
+}
+
+/*
+ * Power management
+ */
 #ifdef CONFIG_PM
 
 static struct {
@@ -653,337 +1112,6 @@ static void apic_pm_activate(void) { }
 
 #endif  /* CONFIG_PM */
 
-static int __init apic_set_verbosity(char *str)
-{
-        if (str == NULL)  {
-                skip_ioapic_setup = 0;
-                ioapic_force = 1;
-                return 0;
-        }
-        if (strcmp("debug", str) == 0)
-                apic_verbosity = APIC_DEBUG;
-        else if (strcmp("verbose", str) == 0)
-                apic_verbosity = APIC_VERBOSE;
-        else {
-                printk(KERN_WARNING "APIC Verbosity level %s not recognised"
-                                " use apic=verbose or apic=debug\n", str);
-                return -EINVAL;
-        }
-
-        return 0;
-}
-early_param("apic", apic_set_verbosity);
-
-/*
- * Detect and enable local APICs on non-SMP boards.
- * Original code written by Keir Fraser.
- * On AMD64 we trust the BIOS - if it says no APIC it is likely
- * not correctly set up (usually the APIC timer won't work etc.)
- */
-
-static int __init detect_init_APIC (void)
-{
-        if (!cpu_has_apic) {
-                printk(KERN_INFO "No local APIC present\n");
-                return -1;
-        }
-
-        mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-        boot_cpu_id = 0;
-        return 0;
-}
-
-void __init init_apic_mappings(void)
-{
-        unsigned long apic_phys;
-
-        /*
-         * If no local APIC can be found then set up a fake all
-         * zeroes page to simulate the local APIC and another
-         * one for the IO-APIC.
-         */
-        if (!smp_found_config && detect_init_APIC()) {
-                apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
-                apic_phys = __pa(apic_phys);
-        } else
-                apic_phys = mp_lapic_addr;
-
-        set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
-        apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
-                                APIC_BASE, apic_phys);
-
-        /* Put local APIC into the resource map. */
-        lapic_resource.start = apic_phys;
-        lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
-        insert_resource(&iomem_resource, &lapic_resource);
-
-        /*
-         * Fetch the APIC ID of the BSP in case we have a
-         * default configuration (or the MP table is broken).
-         */
-        boot_cpu_id = GET_APIC_ID(apic_read(APIC_ID));
-}
-
-/*
- * This function sets up the local APIC timer, with a timeout of
- * 'clocks' APIC bus clock. During calibration we actually call
- * this function twice on the boot CPU, once with a bogus timeout
- * value, second time for real. The other (noncalibrating) CPUs
- * call this function only once, with the real, calibrated value.
- *
- * We do reads before writes even if unnecessary, to get around the
- * P5 APIC double write bug.
- */
-
-static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
-{
-        unsigned int lvtt_value, tmp_value;
-
-        lvtt_value = LOCAL_TIMER_VECTOR;
-        if (!oneshot)
-                lvtt_value |= APIC_LVT_TIMER_PERIODIC;
-        if (!irqen)
-                lvtt_value |= APIC_LVT_MASKED;
-
-        apic_write(APIC_LVTT, lvtt_value);
-
-        /*
-         * Divide PICLK by 16
-         */
-        tmp_value = apic_read(APIC_TDCR);
-        apic_write(APIC_TDCR, (tmp_value
-                                & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE))
-                                | APIC_TDR_DIV_16);
-
-        if (!oneshot)
-                apic_write(APIC_TMICT, clocks);
-}
-
-static void setup_APIC_timer(void)
-{
-        struct clock_event_device *levt = &__get_cpu_var(lapic_events);
-
-        memcpy(levt, &lapic_clockevent, sizeof(*levt));
-        levt->cpumask = cpumask_of_cpu(smp_processor_id());
-
-        clockevents_register_device(levt);
-}
-
-/*
- * In this function we calibrate APIC bus clocks to the external
- * timer. Unfortunately we cannot use jiffies and the timer irq
- * to calibrate, since some later bootup code depends on getting
- * the first irq? Ugh.
- *
- * We want to do the calibration only once since we
- * want to have local timer irqs syncron. CPUs connected
- * by the same APIC bus have the very same bus frequency.
- * And we want to have irqs off anyways, no accidental
- * APIC irq that way.
- */
-
-#define TICK_COUNT 100000000
-
-static void __init calibrate_APIC_clock(void)
-{
-        unsigned apic, apic_start;
-        unsigned long tsc, tsc_start;
-        int result;
-
-        local_irq_disable();
-
-        /*
-         * Put whatever arbitrary (but long enough) timeout
-         * value into the APIC clock, we just want to get the
-         * counter running for calibration.
-         *
-         * No interrupt enable !
-         */
-        __setup_APIC_LVTT(250000000, 0, 0);
-
-        apic_start = apic_read(APIC_TMCCT);
-#ifdef CONFIG_X86_PM_TIMER
-        if (apic_calibrate_pmtmr && pmtmr_ioport) {
-                pmtimer_wait(5000);  /* 5ms wait */
-                apic = apic_read(APIC_TMCCT);
-                result = (apic_start - apic) * 1000L / 5;
-        } else
-#endif
-        {
-                rdtscll(tsc_start);
-
-                do {
-                        apic = apic_read(APIC_TMCCT);
-                        rdtscll(tsc);
-                } while ((tsc - tsc_start) < TICK_COUNT &&
-                                (apic_start - apic) < TICK_COUNT);
-
-                result = (apic_start - apic) * 1000L * tsc_khz /
-                                        (tsc - tsc_start);
-        }
-
-        local_irq_enable();
-
-        printk(KERN_DEBUG "APIC timer calibration result %d\n", result);
-
-        printk(KERN_INFO "Detected %d.%03d MHz APIC timer.\n",
-                result / 1000 / 1000, result / 1000 % 1000);
-
-        /* Calculate the scaled math multiplication factor */
-        lapic_clockevent.mult = div_sc(result, NSEC_PER_SEC, 32);
-        lapic_clockevent.max_delta_ns =
-                clockevent_delta2ns(0x7FFFFF, &lapic_clockevent);
-        lapic_clockevent.min_delta_ns =
-                clockevent_delta2ns(0xF, &lapic_clockevent);
-
-        calibration_result = result / HZ;
-}
-
-void __init setup_boot_APIC_clock (void)
-{
-        /*
-         * The local apic timer can be disabled via the kernel commandline.
-         * Register the lapic timer as a dummy clock event source on SMP
-         * systems, so the broadcast mechanism is used. On UP systems simply
-         * ignore it.
-         */
-        if (disable_apic_timer) {
-                printk(KERN_INFO "Disabling APIC timer\n");
-                /* No broadcast on UP ! */
-                if (num_possible_cpus() > 1)
-                        setup_APIC_timer();
-                return;
-        }
-
-        printk(KERN_INFO "Using local APIC timer interrupts.\n");
-        calibrate_APIC_clock();
-
-        /*
-         * If nmi_watchdog is set to IO_APIC, we need the
-         * PIT/HPET going.  Otherwise register lapic as a dummy
-         * device.
-         */
-        if (nmi_watchdog != NMI_IO_APIC)
-                lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY;
-        else
-                printk(KERN_WARNING "APIC timer registered as dummy,"
-                       " due to nmi_watchdog=1!\n");
-
-        setup_APIC_timer();
-}
-
-/*
- * AMD C1E enabled CPUs have a real nasty problem: Some BIOSes set the
- * C1E flag only in the secondary CPU, so when we detect the wreckage
- * we already have enabled the boot CPU local apic timer. Check, if
- * disable_apic_timer is set and the DUMMY flag is cleared. If yes,
- * set the DUMMY flag again and force the broadcast mode in the
- * clockevents layer.
- */
-void __cpuinit check_boot_apic_timer_broadcast(void)
-{
-        if (!disable_apic_timer ||
-            (lapic_clockevent.features & CLOCK_EVT_FEAT_DUMMY))
-                return;
-
-        printk(KERN_INFO "AMD C1E detected late. Force timer broadcast.\n");
-        lapic_clockevent.features |= CLOCK_EVT_FEAT_DUMMY;
-
-        local_irq_enable();
-        clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_FORCE, &boot_cpu_id);
-        local_irq_disable();
-}
-
-void __cpuinit setup_secondary_APIC_clock(void)
-{
-        check_boot_apic_timer_broadcast();
-        setup_APIC_timer();
-}
-
-int setup_profiling_timer(unsigned int multiplier)
-{
-        return -EINVAL;
-}
-
-void setup_APIC_extended_lvt(unsigned char lvt_off, unsigned char vector,
-                             unsigned char msg_type, unsigned char mask)
-{
-        unsigned long reg = (lvt_off << 4) + K8_APIC_EXT_LVT_BASE;
-        unsigned int  v   = (mask << 16) | (msg_type << 8) | vector;
-        apic_write(reg, v);
-}
-
-/*
- * Local timer interrupt handler. It does both profiling and
- * process statistics/rescheduling.
- *
- * We do profiling in every local tick, statistics/rescheduling
- * happen only every 'profiling multiplier' ticks. The default
- * multiplier is 1 and it can be changed by writing the new multiplier
- * value into /proc/profile.
- */
-
-static void smp_local_timer_interrupt(void)
-{
-        int cpu = smp_processor_id();
-        struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
-
-        /*
-         * Normally we should not be here till LAPIC has been initialized but
-         * in some cases like kdump, its possible that there is a pending LAPIC
-         * timer interrupt from previous kernel's context and is delivered in
-         * new kernel the moment interrupts are enabled.
-         *
-         * Interrupts are enabled early and LAPIC is setup much later, hence
-         * its possible that when we get here evt->event_handler is NULL.
-         * Check for event_handler being NULL and discard the interrupt as
-         * spurious.
-         */
-        if (!evt->event_handler) {
-                printk(KERN_WARNING
-                       "Spurious LAPIC timer interrupt on cpu %d\n", cpu);
-                /* Switch it off */
-                lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt);
-                return;
-        }
-
-        /*
-         * the NMI deadlock-detector uses this.
-         */
-        add_pda(apic_timer_irqs, 1);
-
-        evt->event_handler(evt);
-}
-
-/*
- * Local APIC timer interrupt. This is the most natural way for doing
- * local interrupts, but local timer interrupts can be emulated by
- * broadcast interrupts too. [in case the hw doesn't support APIC timers]
- *
- * [ if a single-CPU system runs an SMP kernel then we call the local
- *   interrupt as well. Thus we cannot inline the local irq ... ]
- */
-void smp_apic_timer_interrupt(struct pt_regs *regs)
-{
-        struct pt_regs *old_regs = set_irq_regs(regs);
-
-        /*
-         * NOTE! We'd better ACK the irq immediately,
-         * because timer handling can be slow.
-         */
-        ack_APIC_irq();
-        /*
-         * update_process_times() expects us to have done irq_enter().
-         * Besides, if we don't timer interrupts ignore the global
-         * interrupt lock, which is the WrongThing (tm) to do.
-         */
-        exit_idle();
-        irq_enter();
-        smp_local_timer_interrupt();
-        irq_exit();
-        set_irq_regs(old_regs);
-}
-
 /*
  * apic_is_clustered_box() -- Check if we can expect good TSC
  *
@@ -1032,91 +1160,28 @@ __cpuinit int apic_is_clustered_box(void)
 }
 
 /*
- * This interrupt should _never_ happen with our APIC/SMP architecture
- */
-asmlinkage void smp_spurious_interrupt(void)
-{
-        unsigned int v;
-        exit_idle();
-        irq_enter();
-        /*
-         * Check if this really is a spurious interrupt and ACK it
-         * if it is a vectored one.  Just in case...
-         * Spurious interrupts should not be ACKed.
-         */
-        v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
-        if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
-                ack_APIC_irq();
-
-        add_pda(irq_spurious_count, 1);
-        irq_exit();
-}
-
-/*
- * This interrupt should never happen with our APIC/SMP architecture
- */
-
-asmlinkage void smp_error_interrupt(void)
-{
-        unsigned int v, v1;
-
-        exit_idle();
-        irq_enter();
-        /* First tickle the hardware, only then report what went on. -- REW */
-        v = apic_read(APIC_ESR);
-        apic_write(APIC_ESR, 0);
-        v1 = apic_read(APIC_ESR);
-        ack_APIC_irq();
-        atomic_inc(&irq_err_count);
-
-        /* Here is what the APIC error bits mean:
-           0: Send CS error
-           1: Receive CS error
-           2: Send accept error
-           3: Receive accept error
-           4: Reserved
-           5: Send illegal vector
-           6: Received illegal vector
-           7: Illegal register address
-        */
-        printk (KERN_DEBUG "APIC error on CPU%d: %02x(%02x)\n",
-                smp_processor_id(), v , v1);
-        irq_exit();
-}
-
-int disable_apic;
-
-/*
- * This initializes the IO-APIC and APIC hardware if this is
- * a UP kernel.
+ * APIC command line parameters
  */
-int __init APIC_init_uniprocessor (void)
+static int __init apic_set_verbosity(char *str)
 {
-        if (disable_apic) {
-                printk(KERN_INFO "Apic disabled\n");
-                return -1;
+        if (str == NULL)  {
+                skip_ioapic_setup = 0;
+                ioapic_force = 1;
+                return 0;
         }
-        if (!cpu_has_apic) {
-                disable_apic = 1;
-                printk(KERN_INFO "Apic disabled by BIOS\n");
-                return -1;
+        if (strcmp("debug", str) == 0)
+                apic_verbosity = APIC_DEBUG;
+        else if (strcmp("verbose", str) == 0)
+                apic_verbosity = APIC_VERBOSE;
+        else {
+                printk(KERN_WARNING "APIC Verbosity level %s not recognised"
+                                " use apic=verbose or apic=debug\n", str);
+                return -EINVAL;
         }
 
-        verify_local_APIC();
-
-        phys_cpu_present_map = physid_mask_of_physid(boot_cpu_id);
-        apic_write(APIC_ID, SET_APIC_ID(boot_cpu_id));
-
-        setup_local_APIC();
-
-        if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
-                setup_IO_APIC();
-        else
-                nr_ioapics = 0;
-        setup_boot_APIC_clock();
-        check_nmi_watchdog();
         return 0;
 }
+early_param("apic", apic_set_verbosity);
 
 static __init int setup_disableapic(char *str)
 {