io_apic.c
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上传日期:2013-04-10
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文件大小:41k
- /*
- * Intel IO-APIC support for multi-Pentium hosts.
- *
- * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
- *
- * Many thanks to Stig Venaas for trying out countless experimental
- * patches and reporting/debugging problems patiently!
- *
- * (c) 1999, Multiple IO-APIC support, developed by
- * Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
- * Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
- * further tested and cleaned up by Zach Brown <zab@redhat.com>
- * and 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
- */
- #include <linux/mm.h>
- #include <linux/irq.h>
- #include <linux/interrupt.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/sched.h>
- #include <linux/config.h>
- #include <linux/smp_lock.h>
- #include <linux/mc146818rtc.h>
- #include <asm/io.h>
- #include <asm/smp.h>
- #include <asm/desc.h>
- #include <asm/smpboot.h>
- #undef APIC_LOCKUP_DEBUG
- #define APIC_LOCKUP_DEBUG
- static spinlock_t ioapic_lock = SPIN_LOCK_UNLOCKED;
- unsigned int int_dest_addr_mode = APIC_DEST_LOGICAL;
- unsigned char int_delivery_mode = dest_LowestPrio;
- /*
- * # of IRQ routing registers
- */
- int nr_ioapic_registers[MAX_IO_APICS];
- /*
- * Rough estimation of how many shared IRQs there are, can
- * be changed anytime.
- */
- #define MAX_PLUS_SHARED_IRQS NR_IRQS
- #define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
- /*
- * This is performance-critical, we want to do it O(1)
- *
- * the indexing order of this array favors 1:1 mappings
- * between pins and IRQs.
- */
- static struct irq_pin_list {
- int apic, pin, next;
- } irq_2_pin[PIN_MAP_SIZE];
- /*
- * The common case is 1:1 IRQ<->pin mappings. Sometimes there are
- * shared ISA-space IRQs, so we have to support them. We are super
- * fast in the common case, and fast for shared ISA-space IRQs.
- */
- static void __init add_pin_to_irq(unsigned int irq, int apic, int pin)
- {
- static int first_free_entry = NR_IRQS;
- struct irq_pin_list *entry = irq_2_pin + irq;
- while (entry->next)
- entry = irq_2_pin + entry->next;
- if (entry->pin != -1) {
- entry->next = first_free_entry;
- entry = irq_2_pin + entry->next;
- if (++first_free_entry >= PIN_MAP_SIZE)
- panic("io_apic.c: whoops");
- }
- entry->apic = apic;
- entry->pin = pin;
- }
- /*
- * Reroute an IRQ to a different pin.
- */
- static void __init replace_pin_at_irq(unsigned int irq,
- int oldapic, int oldpin,
- int newapic, int newpin)
- {
- struct irq_pin_list *entry = irq_2_pin + irq;
- while (1) {
- if (entry->apic == oldapic && entry->pin == oldpin) {
- entry->apic = newapic;
- entry->pin = newpin;
- }
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
- }
- #define __DO_ACTION(R, ACTION, FINAL)
-
- {
- int pin;
- struct irq_pin_list *entry = irq_2_pin + irq;
-
- for (;;) {
- unsigned int reg;
- pin = entry->pin;
- if (pin == -1)
- break;
- reg = io_apic_read(entry->apic, 0x10 + R + pin*2);
- reg ACTION;
- io_apic_modify(entry->apic, reg);
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
- FINAL;
- }
- #define DO_ACTION(name,R,ACTION, FINAL)
-
- static void name##_IO_APIC_irq (unsigned int irq)
- __DO_ACTION(R, ACTION, FINAL)
- DO_ACTION( __mask, 0, |= 0x00010000, io_apic_sync(entry->apic) )
- /* mask = 1 */
- DO_ACTION( __unmask, 0, &= 0xfffeffff, )
- /* mask = 0 */
- DO_ACTION( __mask_and_edge, 0, = (reg & 0xffff7fff) | 0x00010000, )
- /* mask = 1, trigger = 0 */
- DO_ACTION( __unmask_and_level, 0, = (reg & 0xfffeffff) | 0x00008000, )
- /* mask = 0, trigger = 1 */
- static void mask_IO_APIC_irq (unsigned int irq)
- {
- unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
- __mask_IO_APIC_irq(irq);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- }
- static void unmask_IO_APIC_irq (unsigned int irq)
- {
- unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
- __unmask_IO_APIC_irq(irq);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- }
- void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
- {
- struct IO_APIC_route_entry entry;
- unsigned long flags;
- /*
- * Disable it in the IO-APIC irq-routing table:
- */
- memset(&entry, 0, sizeof(entry));
- entry.mask = 1;
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0));
- io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1));
- spin_unlock_irqrestore(&ioapic_lock, flags);
- }
- static void clear_IO_APIC (void)
- {
- int apic, pin;
- for (apic = 0; apic < nr_ioapics; apic++)
- for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
- clear_IO_APIC_pin(apic, pin);
- }
- /*
- * support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
- * specific CPU-side IRQs.
- */
- #define MAX_PIRQS 8
- int pirq_entries [MAX_PIRQS];
- int pirqs_enabled;
- int skip_ioapic_setup;
- static int __init noioapic_setup(char *str)
- {
- skip_ioapic_setup = 1;
- return 1;
- }
- __setup("noapic", noioapic_setup);
- static int __init ioapic_setup(char *str)
- {
- skip_ioapic_setup = 0;
- return 1;
- }
- __setup("apic", ioapic_setup);
- static int __init ioapic_pirq_setup(char *str)
- {
- int i, max;
- int ints[MAX_PIRQS+1];
- get_options(str, ARRAY_SIZE(ints), ints);
- for (i = 0; i < MAX_PIRQS; i++)
- pirq_entries[i] = -1;
- pirqs_enabled = 1;
- printk(KERN_INFO "PIRQ redirection, working around broken MP-BIOS.n");
- max = MAX_PIRQS;
- if (ints[0] < MAX_PIRQS)
- max = ints[0];
- for (i = 0; i < max; i++) {
- printk(KERN_DEBUG "... PIRQ%d -> IRQ %dn", i, ints[i+1]);
- /*
- * PIRQs are mapped upside down, usually.
- */
- pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
- }
- return 1;
- }
- __setup("pirq=", ioapic_pirq_setup);
- /*
- * Find the IRQ entry number of a certain pin.
- */
- static int __init find_irq_entry(int apic, int pin, int type)
- {
- int i;
- for (i = 0; i < mp_irq_entries; i++)
- if (mp_irqs[i].mpc_irqtype == type &&
- (mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
- mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
- mp_irqs[i].mpc_dstirq == pin)
- return i;
- return -1;
- }
- /*
- * Find the pin to which IRQ[irq] (ISA) is connected
- */
- static int __init find_isa_irq_pin(int irq, int type)
- {
- int i;
- for (i = 0; i < mp_irq_entries; i++) {
- int lbus = mp_irqs[i].mpc_srcbus;
- if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
- mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
- mp_bus_id_to_type[lbus] == MP_BUS_MCA) &&
- (mp_irqs[i].mpc_irqtype == type) &&
- (mp_irqs[i].mpc_srcbusirq == irq))
- return mp_irqs[i].mpc_dstirq;
- }
- return -1;
- }
- /*
- * Find a specific PCI IRQ entry.
- * Not an __init, possibly needed by modules
- */
- static int pin_2_irq(int idx, int apic, int pin);
- int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
- {
- int apic, i, best_guess = -1;
- Dprintk("querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.n",
- bus, slot, pin);
- if (mp_bus_id_to_pci_bus[bus] == -1) {
- printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!n", bus);
- return -1;
- }
- for (i = 0; i < mp_irq_entries; i++) {
- int lbus = mp_irqs[i].mpc_srcbus;
- for (apic = 0; apic < nr_ioapics; apic++)
- if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
- mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
- break;
- if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
- !mp_irqs[i].mpc_irqtype &&
- (bus == lbus) &&
- (slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
- int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
- if (!(apic || IO_APIC_IRQ(irq)))
- continue;
- if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
- return irq;
- /*
- * Use the first all-but-pin matching entry as a
- * best-guess fuzzy result for broken mptables.
- */
- if (best_guess < 0)
- best_guess = irq;
- }
- }
- return best_guess;
- }
- /*
- * EISA Edge/Level control register, ELCR
- */
- static int __init EISA_ELCR(unsigned int irq)
- {
- if (irq < 16) {
- unsigned int port = 0x4d0 + (irq >> 3);
- return (inb(port) >> (irq & 7)) & 1;
- }
- printk(KERN_INFO "Broken MPtable reports ISA irq %dn", irq);
- return 0;
- }
- /* EISA interrupts are always polarity zero and can be edge or level
- * trigger depending on the ELCR value. If an interrupt is listed as
- * EISA conforming in the MP table, that means its trigger type must
- * be read in from the ELCR */
- #define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
- #define default_EISA_polarity(idx) (0)
- /* ISA interrupts are always polarity zero edge triggered,
- * when listed as conforming in the MP table. */
- #define default_ISA_trigger(idx) (0)
- #define default_ISA_polarity(idx) (0)
- /* PCI interrupts are always polarity one level triggered,
- * when listed as conforming in the MP table. */
- #define default_PCI_trigger(idx) (1)
- #define default_PCI_polarity(idx) (1)
- /* MCA interrupts are always polarity zero level triggered,
- * when listed as conforming in the MP table. */
- #define default_MCA_trigger(idx) (1)
- #define default_MCA_polarity(idx) (0)
- static int __init MPBIOS_polarity(int idx)
- {
- int bus = mp_irqs[idx].mpc_srcbus;
- int polarity;
- /*
- * Determine IRQ line polarity (high active or low active):
- */
- switch (mp_irqs[idx].mpc_irqflag & 3)
- {
- case 0: /* conforms, ie. bus-type dependent polarity */
- {
- switch (mp_bus_id_to_type[bus])
- {
- case MP_BUS_ISA: /* ISA pin */
- {
- polarity = default_ISA_polarity(idx);
- break;
- }
- case MP_BUS_EISA: /* EISA pin */
- {
- polarity = default_EISA_polarity(idx);
- break;
- }
- case MP_BUS_PCI: /* PCI pin */
- {
- polarity = default_PCI_polarity(idx);
- break;
- }
- case MP_BUS_MCA: /* MCA pin */
- {
- polarity = default_MCA_polarity(idx);
- break;
- }
- default:
- {
- printk(KERN_WARNING "broken BIOS!!n");
- polarity = 1;
- break;
- }
- }
- break;
- }
- case 1: /* high active */
- {
- polarity = 0;
- break;
- }
- case 2: /* reserved */
- {
- printk(KERN_WARNING "broken BIOS!!n");
- polarity = 1;
- break;
- }
- case 3: /* low active */
- {
- polarity = 1;
- break;
- }
- default: /* invalid */
- {
- printk(KERN_WARNING "broken BIOS!!n");
- polarity = 1;
- break;
- }
- }
- return polarity;
- }
- static int __init MPBIOS_trigger(int idx)
- {
- int bus = mp_irqs[idx].mpc_srcbus;
- int trigger;
- /*
- * Determine IRQ trigger mode (edge or level sensitive):
- */
- switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
- {
- case 0: /* conforms, ie. bus-type dependent */
- {
- switch (mp_bus_id_to_type[bus])
- {
- case MP_BUS_ISA: /* ISA pin */
- {
- trigger = default_ISA_trigger(idx);
- break;
- }
- case MP_BUS_EISA: /* EISA pin */
- {
- trigger = default_EISA_trigger(idx);
- break;
- }
- case MP_BUS_PCI: /* PCI pin */
- {
- trigger = default_PCI_trigger(idx);
- break;
- }
- case MP_BUS_MCA: /* MCA pin */
- {
- trigger = default_MCA_trigger(idx);
- break;
- }
- default:
- {
- printk(KERN_WARNING "broken BIOS!!n");
- trigger = 1;
- break;
- }
- }
- break;
- }
- case 1: /* edge */
- {
- trigger = 0;
- break;
- }
- case 2: /* reserved */
- {
- printk(KERN_WARNING "broken BIOS!!n");
- trigger = 1;
- break;
- }
- case 3: /* level */
- {
- trigger = 1;
- break;
- }
- default: /* invalid */
- {
- printk(KERN_WARNING "broken BIOS!!n");
- trigger = 0;
- break;
- }
- }
- return trigger;
- }
- static inline int irq_polarity(int idx)
- {
- return MPBIOS_polarity(idx);
- }
- static inline int irq_trigger(int idx)
- {
- return MPBIOS_trigger(idx);
- }
- static int pin_2_irq(int idx, int apic, int pin)
- {
- int irq, i;
- int bus = mp_irqs[idx].mpc_srcbus;
- /*
- * Debugging check, we are in big trouble if this message pops up!
- */
- if (mp_irqs[idx].mpc_dstirq != pin)
- printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!n");
- switch (mp_bus_id_to_type[bus])
- {
- case MP_BUS_ISA: /* ISA pin */
- case MP_BUS_EISA:
- case MP_BUS_MCA:
- {
- irq = mp_irqs[idx].mpc_srcbusirq;
- break;
- }
- case MP_BUS_PCI: /* PCI pin */
- {
- /*
- * PCI IRQs are mapped in order
- */
- i = irq = 0;
- while (i < apic)
- irq += nr_ioapic_registers[i++];
- irq += pin;
- break;
- }
- default:
- {
- printk(KERN_ERR "unknown bus type %d.n",bus);
- irq = 0;
- break;
- }
- }
- /*
- * PCI IRQ command line redirection. Yes, limits are hardcoded.
- */
- if ((pin >= 16) && (pin <= 23)) {
- if (pirq_entries[pin-16] != -1) {
- if (!pirq_entries[pin-16]) {
- printk(KERN_DEBUG "disabling PIRQ%dn", pin-16);
- } else {
- irq = pirq_entries[pin-16];
- printk(KERN_DEBUG "using PIRQ%d -> IRQ %dn",
- pin-16, irq);
- }
- }
- }
- return irq;
- }
- static inline int IO_APIC_irq_trigger(int irq)
- {
- int apic, idx, pin;
- for (apic = 0; apic < nr_ioapics; apic++) {
- for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
- idx = find_irq_entry(apic,pin,mp_INT);
- if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
- return irq_trigger(idx);
- }
- }
- /*
- * nonexistent IRQs are edge default
- */
- return 0;
- }
- int irq_vector[NR_IRQS] = { FIRST_DEVICE_VECTOR , 0 };
- static int __init assign_irq_vector(int irq)
- {
- static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
- if (IO_APIC_VECTOR(irq) > 0)
- return IO_APIC_VECTOR(irq);
- next:
- current_vector += 8;
- if (current_vector == SYSCALL_VECTOR)
- goto next;
- if (current_vector > FIRST_SYSTEM_VECTOR) {
- offset++;
- current_vector = FIRST_DEVICE_VECTOR + offset;
- }
- if (current_vector == FIRST_SYSTEM_VECTOR)
- panic("ran out of interrupt sources!");
- IO_APIC_VECTOR(irq) = current_vector;
- return current_vector;
- }
- extern void (*interrupt[NR_IRQS])(void);
- static struct hw_interrupt_type ioapic_level_irq_type;
- static struct hw_interrupt_type ioapic_edge_irq_type;
- void __init setup_IO_APIC_irqs(void)
- {
- struct IO_APIC_route_entry entry;
- int apic, pin, idx, irq, first_notcon = 1, vector;
- unsigned long flags;
- printk(KERN_DEBUG "init IO_APIC IRQsn");
- for (apic = 0; apic < nr_ioapics; apic++) {
- for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
- /*
- * add it to the IO-APIC irq-routing table:
- */
- memset(&entry,0,sizeof(entry));
- entry.delivery_mode = INT_DELIVERY_MODE;
- entry.dest_mode = (INT_DEST_ADDR_MODE != 0);
- entry.mask = 0; /* enable IRQ */
- entry.dest.logical.logical_dest = target_cpus();
- idx = find_irq_entry(apic,pin,mp_INT);
- if (idx == -1) {
- if (first_notcon) {
- printk(KERN_DEBUG " IO-APIC (apicid-pin) %d-%d", mp_ioapics[apic].mpc_apicid, pin);
- first_notcon = 0;
- } else
- printk(", %d-%d", mp_ioapics[apic].mpc_apicid, pin);
- continue;
- }
- entry.trigger = irq_trigger(idx);
- entry.polarity = irq_polarity(idx);
- if (irq_trigger(idx)) {
- entry.trigger = 1;
- entry.mask = 1;
- }
- irq = pin_2_irq(idx, apic, pin);
- /*
- * skip adding the timer int on secondary nodes, which causes
- * a small but painful rift in the time-space continuum
- */
- if ((clustered_apic_mode == CLUSTERED_APIC_NUMAQ)
- && (apic != 0) && (irq == 0))
- continue;
- else
- add_pin_to_irq(irq, apic, pin);
- if (!apic && !IO_APIC_IRQ(irq))
- continue;
- if (IO_APIC_IRQ(irq)) {
- vector = assign_irq_vector(irq);
- entry.vector = vector;
- if (IO_APIC_irq_trigger(irq))
- irq_desc[irq].handler = &ioapic_level_irq_type;
- else
- irq_desc[irq].handler = &ioapic_edge_irq_type;
- set_intr_gate(vector, interrupt[irq]);
-
- if (!apic && (irq < 16))
- disable_8259A_irq(irq);
- }
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
- io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
- }
- }
- if (!first_notcon)
- printk(" not connected.n");
- }
- /*
- * Set up the 8259A-master output pin as broadcast to all
- * CPUs.
- */
- void __init setup_ExtINT_IRQ0_pin(unsigned int pin, int vector)
- {
- struct IO_APIC_route_entry entry;
- unsigned long flags;
- memset(&entry,0,sizeof(entry));
- disable_8259A_irq(0);
- /* mask LVT0 */
- apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
- /*
- * We use logical delivery to get the timer IRQ
- * to the first CPU.
- */
- entry.dest_mode = (INT_DEST_ADDR_MODE != 0);
- entry.mask = 0; /* unmask IRQ now */
- entry.dest.logical.logical_dest = target_cpus();
- entry.delivery_mode = INT_DELIVERY_MODE;
- entry.polarity = 0;
- entry.trigger = 0;
- entry.vector = vector;
- /*
- * The timer IRQ doesn't have to know that behind the
- * scene we have a 8259A-master in AEOI mode ...
- */
- irq_desc[0].handler = &ioapic_edge_irq_type;
- /*
- * Add it to the IO-APIC irq-routing table:
- */
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
- io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
- enable_8259A_irq(0);
- }
- void __init UNEXPECTED_IO_APIC(void)
- {
- printk(KERN_WARNING " WARNING: unexpected IO-APIC, please mailn");
- printk(KERN_WARNING " to linux-smp@vger.kernel.orgn");
- }
- void __init print_IO_APIC(void)
- {
- int apic, i;
- struct IO_APIC_reg_00 reg_00;
- struct IO_APIC_reg_01 reg_01;
- struct IO_APIC_reg_02 reg_02;
- unsigned long flags;
- printk(KERN_DEBUG "number of MP IRQ sources: %d.n", mp_irq_entries);
- for (i = 0; i < nr_ioapics; i++)
- printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.n",
- mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
- /*
- * We are a bit conservative about what we expect. We have to
- * know about every hardware change ASAP.
- */
- printk(KERN_INFO "testing the IO APIC.......................n");
- for (apic = 0; apic < nr_ioapics; apic++) {
- spin_lock_irqsave(&ioapic_lock, flags);
- *(int *)®_00 = io_apic_read(apic, 0);
- *(int *)®_01 = io_apic_read(apic, 1);
- if (reg_01.version >= 0x10)
- *(int *)®_02 = io_apic_read(apic, 2);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- printk("n");
- printk(KERN_DEBUG "IO APIC #%d......n", mp_ioapics[apic].mpc_apicid);
- printk(KERN_DEBUG ".... register #00: %08Xn", *(int *)®_00);
- printk(KERN_DEBUG "....... : physical APIC id: %02Xn", reg_00.ID);
- if (reg_00.__reserved_1 || reg_00.__reserved_2)
- UNEXPECTED_IO_APIC();
- printk(KERN_DEBUG ".... register #01: %08Xn", *(int *)®_01);
- printk(KERN_DEBUG "....... : max redirection entries: %04Xn", reg_01.entries);
- if ( (reg_01.entries != 0x0f) && /* older (Neptune) boards */
- (reg_01.entries != 0x17) && /* typical ISA+PCI boards */
- (reg_01.entries != 0x1b) && /* Compaq Proliant boards */
- (reg_01.entries != 0x1f) && /* dual Xeon boards */
- (reg_01.entries != 0x22) && /* bigger Xeon boards */
- (reg_01.entries != 0x2E) &&
- (reg_01.entries != 0x3F)
- )
- UNEXPECTED_IO_APIC();
- printk(KERN_DEBUG "....... : PRQ implemented: %Xn", reg_01.PRQ);
- printk(KERN_DEBUG "....... : IO APIC version: %04Xn", reg_01.version);
- if ( (reg_01.version != 0x01) && /* 82489DX IO-APICs */
- (reg_01.version != 0x10) && /* oldest IO-APICs */
- (reg_01.version != 0x11) && /* Pentium/Pro IO-APICs */
- (reg_01.version != 0x13) && /* Xeon IO-APICs */
- (reg_01.version != 0x20) /* Intel P64H (82806 AA) */
- )
- UNEXPECTED_IO_APIC();
- if (reg_01.__reserved_1 || reg_01.__reserved_2)
- UNEXPECTED_IO_APIC();
- if (reg_01.version >= 0x10) {
- printk(KERN_DEBUG ".... register #02: %08Xn", *(int *)®_02);
- printk(KERN_DEBUG "....... : arbitration: %02Xn", reg_02.arbitration);
- if (reg_02.__reserved_1 || reg_02.__reserved_2)
- UNEXPECTED_IO_APIC();
- }
- printk(KERN_DEBUG ".... IRQ redirection table:n");
- printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
- " Stat Dest Deli Vect: n");
- for (i = 0; i <= reg_01.entries; i++) {
- struct IO_APIC_route_entry entry;
- spin_lock_irqsave(&ioapic_lock, flags);
- *(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2);
- *(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- printk(KERN_DEBUG " %02x %03X %02X ",
- i,
- entry.dest.logical.logical_dest,
- entry.dest.physical.physical_dest
- );
- printk("%1d %1d %1d %1d %1d %1d %1d %02Xn",
- entry.mask,
- entry.trigger,
- entry.irr,
- entry.polarity,
- entry.delivery_status,
- entry.dest_mode,
- entry.delivery_mode,
- entry.vector
- );
- }
- }
- printk(KERN_DEBUG "IRQ to pin mappings:n");
- for (i = 0; i < NR_IRQS; i++) {
- struct irq_pin_list *entry = irq_2_pin + i;
- if (entry->pin < 0)
- continue;
- printk(KERN_DEBUG "IRQ%d ", i);
- for (;;) {
- printk("-> %d:%d", entry->apic, entry->pin);
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
- printk("n");
- }
- printk(KERN_INFO ".................................... done.n");
- return;
- }
- static void print_APIC_bitfield (int base)
- {
- unsigned int v;
- int i, j;
- printk(KERN_DEBUG "0123456789abcdef0123456789abcdefn" KERN_DEBUG);
- for (i = 0; i < 8; i++) {
- v = apic_read(base + i*0x10);
- for (j = 0; j < 32; j++) {
- if (v & (1<<j))
- printk("1");
- else
- printk("0");
- }
- printk("n");
- }
- }
- void /*__init*/ print_local_APIC(void * dummy)
- {
- unsigned int v, ver, maxlvt;
- printk("n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:n",
- smp_processor_id(), hard_smp_processor_id());
- v = apic_read(APIC_ID);
- printk(KERN_INFO "... APIC ID: %08x (%01x)n", v, GET_APIC_ID(v));
- v = apic_read(APIC_LVR);
- printk(KERN_INFO "... APIC VERSION: %08xn", v);
- ver = GET_APIC_VERSION(v);
- maxlvt = get_maxlvt();
- v = apic_read(APIC_TASKPRI);
- printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)n", v, v & APIC_TPRI_MASK);
- if (APIC_INTEGRATED(ver)) { /* !82489DX */
- v = apic_read(APIC_ARBPRI);
- printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)n", v,
- v & APIC_ARBPRI_MASK);
- v = apic_read(APIC_PROCPRI);
- printk(KERN_DEBUG "... APIC PROCPRI: %08xn", v);
- }
- v = apic_read(APIC_EOI);
- printk(KERN_DEBUG "... APIC EOI: %08xn", v);
- v = apic_read(APIC_RRR);
- printk(KERN_DEBUG "... APIC RRR: %08xn", v);
- v = apic_read(APIC_LDR);
- printk(KERN_DEBUG "... APIC LDR: %08xn", v);
- v = apic_read(APIC_DFR);
- printk(KERN_DEBUG "... APIC DFR: %08xn", v);
- v = apic_read(APIC_SPIV);
- printk(KERN_DEBUG "... APIC SPIV: %08xn", v);
- printk(KERN_DEBUG "... APIC ISR field:n");
- print_APIC_bitfield(APIC_ISR);
- printk(KERN_DEBUG "... APIC TMR field:n");
- print_APIC_bitfield(APIC_TMR);
- printk(KERN_DEBUG "... APIC IRR field:n");
- print_APIC_bitfield(APIC_IRR);
- if (APIC_INTEGRATED(ver)) { /* !82489DX */
- if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
- apic_write(APIC_ESR, 0);
- v = apic_read(APIC_ESR);
- printk(KERN_DEBUG "... APIC ESR: %08xn", v);
- }
- v = apic_read(APIC_ICR);
- printk(KERN_DEBUG "... APIC ICR: %08xn", v);
- v = apic_read(APIC_ICR2);
- printk(KERN_DEBUG "... APIC ICR2: %08xn", v);
- v = apic_read(APIC_LVTT);
- printk(KERN_DEBUG "... APIC LVTT: %08xn", v);
- if (maxlvt > 3) { /* PC is LVT#4. */
- v = apic_read(APIC_LVTPC);
- printk(KERN_DEBUG "... APIC LVTPC: %08xn", v);
- }
- v = apic_read(APIC_LVT0);
- printk(KERN_DEBUG "... APIC LVT0: %08xn", v);
- v = apic_read(APIC_LVT1);
- printk(KERN_DEBUG "... APIC LVT1: %08xn", v);
- if (maxlvt > 2) { /* ERR is LVT#3. */
- v = apic_read(APIC_LVTERR);
- printk(KERN_DEBUG "... APIC LVTERR: %08xn", v);
- }
- v = apic_read(APIC_TMICT);
- printk(KERN_DEBUG "... APIC TMICT: %08xn", v);
- v = apic_read(APIC_TMCCT);
- printk(KERN_DEBUG "... APIC TMCCT: %08xn", v);
- v = apic_read(APIC_TDCR);
- printk(KERN_DEBUG "... APIC TDCR: %08xn", v);
- printk("n");
- }
- void print_all_local_APICs (void)
- {
- smp_call_function(print_local_APIC, NULL, 1, 1);
- print_local_APIC(NULL);
- }
- void /*__init*/ print_PIC(void)
- {
- extern spinlock_t i8259A_lock;
- unsigned int v, flags;
- printk(KERN_DEBUG "nprinting PIC contentsn");
- spin_lock_irqsave(&i8259A_lock, flags);
- v = inb(0xa1) << 8 | inb(0x21);
- printk(KERN_DEBUG "... PIC IMR: %04xn", v);
- v = inb(0xa0) << 8 | inb(0x20);
- printk(KERN_DEBUG "... PIC IRR: %04xn", v);
- outb(0x0b,0xa0);
- outb(0x0b,0x20);
- v = inb(0xa0) << 8 | inb(0x20);
- outb(0x0a,0xa0);
- outb(0x0a,0x20);
- spin_unlock_irqrestore(&i8259A_lock, flags);
- printk(KERN_DEBUG "... PIC ISR: %04xn", v);
- v = inb(0x4d1) << 8 | inb(0x4d0);
- printk(KERN_DEBUG "... PIC ELCR: %04xn", v);
- }
- static void __init enable_IO_APIC(void)
- {
- struct IO_APIC_reg_01 reg_01;
- int i;
- unsigned long flags;
- for (i = 0; i < PIN_MAP_SIZE; i++) {
- irq_2_pin[i].pin = -1;
- irq_2_pin[i].next = 0;
- }
- if (!pirqs_enabled)
- for (i = 0; i < MAX_PIRQS; i++)
- pirq_entries[i] = -1;
- /*
- * The number of IO-APIC IRQ registers (== #pins):
- */
- for (i = 0; i < nr_ioapics; i++) {
- spin_lock_irqsave(&ioapic_lock, flags);
- *(int *)®_01 = io_apic_read(i, 1);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- nr_ioapic_registers[i] = reg_01.entries+1;
- }
- /*
- * Do not trust the IO-APIC being empty at bootup
- */
- clear_IO_APIC();
- }
- /*
- * Not an __init, needed by the reboot code
- */
- void disable_IO_APIC(void)
- {
- /*
- * Clear the IO-APIC before rebooting:
- */
- clear_IO_APIC();
- disconnect_bsp_APIC();
- }
- /*
- * function to set the IO-APIC physical IDs based on the
- * values stored in the MPC table.
- *
- * by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
- */
- static void __init setup_ioapic_ids_from_mpc (void)
- {
- struct IO_APIC_reg_00 reg_00;
- unsigned long phys_id_present_map = phys_cpu_present_map;
- int apic;
- int i;
- unsigned char old_id;
- unsigned long flags;
- if (clustered_apic_mode)
- /* We don't have a good way to do this yet - hack */
- phys_id_present_map = (u_long) 0xf;
- /*
- * Set the IOAPIC ID to the value stored in the MPC table.
- */
- for (apic = 0; apic < nr_ioapics; apic++) {
- /* Read the register 0 value */
- spin_lock_irqsave(&ioapic_lock, flags);
- *(int *)®_00 = io_apic_read(apic, 0);
- spin_unlock_irqrestore(&ioapic_lock, flags);
-
- old_id = mp_ioapics[apic].mpc_apicid;
- if (mp_ioapics[apic].mpc_apicid >= 0xf) {
- printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...n",
- apic, mp_ioapics[apic].mpc_apicid);
- printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)n",
- reg_00.ID);
- mp_ioapics[apic].mpc_apicid = reg_00.ID;
- }
- /*
- * Sanity check, is the ID really free? Every APIC in a
- * system must have a unique ID or we get lots of nice
- * 'stuck on smp_invalidate_needed IPI wait' messages.
- */
- if (phys_id_present_map & (1 << mp_ioapics[apic].mpc_apicid)) {
- printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...n",
- apic, mp_ioapics[apic].mpc_apicid);
- for (i = 0; i < 0xf; i++)
- if (!(phys_id_present_map & (1 << i)))
- break;
- if (i >= 0xf)
- panic("Max APIC ID exceeded!n");
- printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)n",
- i);
- phys_id_present_map |= 1 << i;
- mp_ioapics[apic].mpc_apicid = i;
- } else {
- printk("Setting %d in the phys_id_present_mapn", mp_ioapics[apic].mpc_apicid);
- phys_id_present_map |= 1 << mp_ioapics[apic].mpc_apicid;
- }
- /*
- * We need to adjust the IRQ routing table
- * if the ID changed.
- */
- if (old_id != mp_ioapics[apic].mpc_apicid)
- for (i = 0; i < mp_irq_entries; i++)
- if (mp_irqs[i].mpc_dstapic == old_id)
- mp_irqs[i].mpc_dstapic
- = mp_ioapics[apic].mpc_apicid;
- /*
- * Read the right value from the MPC table and
- * write it into the ID register.
- */
- printk(KERN_INFO "...changing IO-APIC physical APIC ID to %d ...",
- mp_ioapics[apic].mpc_apicid);
- reg_00.ID = mp_ioapics[apic].mpc_apicid;
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(apic, 0, *(int *)®_00);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- /*
- * Sanity check
- */
- spin_lock_irqsave(&ioapic_lock, flags);
- *(int *)®_00 = io_apic_read(apic, 0);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- if (reg_00.ID != mp_ioapics[apic].mpc_apicid)
- panic("could not set ID!n");
- else
- printk(" ok.n");
- }
- }
- /*
- * There is a nasty bug in some older SMP boards, their mptable lies
- * about the timer IRQ. We do the following to work around the situation:
- *
- * - timer IRQ defaults to IO-APIC IRQ
- * - if this function detects that timer IRQs are defunct, then we fall
- * back to ISA timer IRQs
- */
- static int __init timer_irq_works(void)
- {
- unsigned int t1 = jiffies;
- sti();
- /* Let ten ticks pass... */
- mdelay((10 * 1000) / HZ);
- /*
- * Expect a few ticks at least, to be sure some possible
- * glue logic does not lock up after one or two first
- * ticks in a non-ExtINT mode. Also the local APIC
- * might have cached one ExtINT interrupt. Finally, at
- * least one tick may be lost due to delays.
- */
- if (jiffies - t1 > 4)
- return 1;
- return 0;
- }
- /*
- * In the SMP+IOAPIC case it might happen that there are an unspecified
- * number of pending IRQ events unhandled. These cases are very rare,
- * so we 'resend' these IRQs via IPIs, to the same CPU. It's much
- * better to do it this way as thus we do not have to be aware of
- * 'pending' interrupts in the IRQ path, except at this point.
- */
- /*
- * Edge triggered needs to resend any interrupt
- * that was delayed but this is now handled in the device
- * independent code.
- */
- #define enable_edge_ioapic_irq unmask_IO_APIC_irq
- static void disable_edge_ioapic_irq (unsigned int irq) { /* nothing */ }
- /*
- * Starting up a edge-triggered IO-APIC interrupt is
- * nasty - we need to make sure that we get the edge.
- * If it is already asserted for some reason, we need
- * return 1 to indicate that is was pending.
- *
- * This is not complete - we should be able to fake
- * an edge even if it isn't on the 8259A...
- */
- static unsigned int startup_edge_ioapic_irq(unsigned int irq)
- {
- int was_pending = 0;
- unsigned long flags;
- spin_lock_irqsave(&ioapic_lock, flags);
- if (irq < 16) {
- disable_8259A_irq(irq);
- if (i8259A_irq_pending(irq))
- was_pending = 1;
- }
- __unmask_IO_APIC_irq(irq);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- return was_pending;
- }
- #define shutdown_edge_ioapic_irq disable_edge_ioapic_irq
- /*
- * Once we have recorded IRQ_PENDING already, we can mask the
- * interrupt for real. This prevents IRQ storms from unhandled
- * devices.
- */
- static void ack_edge_ioapic_irq(unsigned int irq)
- {
- if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED))
- == (IRQ_PENDING | IRQ_DISABLED))
- mask_IO_APIC_irq(irq);
- ack_APIC_irq();
- }
- static void end_edge_ioapic_irq (unsigned int i) { /* nothing */ }
- /*
- * Level triggered interrupts can just be masked,
- * and shutting down and starting up the interrupt
- * is the same as enabling and disabling them -- except
- * with a startup need to return a "was pending" value.
- *
- * Level triggered interrupts are special because we
- * do not touch any IO-APIC register while handling
- * them. We ack the APIC in the end-IRQ handler, not
- * in the start-IRQ-handler. Protection against reentrance
- * from the same interrupt is still provided, both by the
- * generic IRQ layer and by the fact that an unacked local
- * APIC does not accept IRQs.
- */
- static unsigned int startup_level_ioapic_irq (unsigned int irq)
- {
- unmask_IO_APIC_irq(irq);
- return 0; /* don't check for pending */
- }
- #define shutdown_level_ioapic_irq mask_IO_APIC_irq
- #define enable_level_ioapic_irq unmask_IO_APIC_irq
- #define disable_level_ioapic_irq mask_IO_APIC_irq
- static void end_level_ioapic_irq (unsigned int irq)
- {
- unsigned long v;
- int i;
- /*
- * It appears there is an erratum which affects at least version 0x11
- * of I/O APIC (that's the 82093AA and cores integrated into various
- * chipsets). Under certain conditions a level-triggered interrupt is
- * erroneously delivered as edge-triggered one but the respective IRR
- * bit gets set nevertheless. As a result the I/O unit expects an EOI
- * message but it will never arrive and further interrupts are blocked
- * from the source. The exact reason is so far unknown, but the
- * phenomenon was observed when two consecutive interrupt requests
- * from a given source get delivered to the same CPU and the source is
- * temporarily disabled in between.
- *
- * A workaround is to simulate an EOI message manually. We achieve it
- * by setting the trigger mode to edge and then to level when the edge
- * trigger mode gets detected in the TMR of a local APIC for a
- * level-triggered interrupt. We mask the source for the time of the
- * operation to prevent an edge-triggered interrupt escaping meanwhile.
- * The idea is from Manfred Spraul. --macro
- */
- i = IO_APIC_VECTOR(irq);
- v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
- ack_APIC_irq();
- if (!(v & (1 << (i & 0x1f)))) {
- #ifdef APIC_LOCKUP_DEBUG
- struct irq_pin_list *entry;
- #endif
- #ifdef APIC_MISMATCH_DEBUG
- atomic_inc(&irq_mis_count);
- #endif
- spin_lock(&ioapic_lock);
- __mask_and_edge_IO_APIC_irq(irq);
- #ifdef APIC_LOCKUP_DEBUG
- for (entry = irq_2_pin + irq;;) {
- unsigned int reg;
- if (entry->pin == -1)
- break;
- reg = io_apic_read(entry->apic, 0x10 + entry->pin * 2);
- if (reg & 0x00004000)
- printk(KERN_CRIT "Aieee!!! Remote IRR"
- " still set after unlock!n");
- if (!entry->next)
- break;
- entry = irq_2_pin + entry->next;
- }
- #endif
- __unmask_and_level_IO_APIC_irq(irq);
- spin_unlock(&ioapic_lock);
- }
- }
- static void mask_and_ack_level_ioapic_irq (unsigned int irq) { /* nothing */ }
- static void set_ioapic_affinity (unsigned int irq, unsigned long mask)
- {
- unsigned long flags;
- /*
- * Only the first 8 bits are valid.
- */
- mask = mask << 24;
- spin_lock_irqsave(&ioapic_lock, flags);
- __DO_ACTION(1, = mask, )
- spin_unlock_irqrestore(&ioapic_lock, flags);
- }
- /*
- * Level and edge triggered IO-APIC interrupts need different handling,
- * so we use two separate IRQ descriptors. Edge triggered IRQs can be
- * handled with the level-triggered descriptor, but that one has slightly
- * more overhead. Level-triggered interrupts cannot be handled with the
- * edge-triggered handler, without risking IRQ storms and other ugly
- * races.
- */
- static struct hw_interrupt_type ioapic_edge_irq_type = {
- "IO-APIC-edge",
- startup_edge_ioapic_irq,
- shutdown_edge_ioapic_irq,
- enable_edge_ioapic_irq,
- disable_edge_ioapic_irq,
- ack_edge_ioapic_irq,
- end_edge_ioapic_irq,
- set_ioapic_affinity,
- };
- static struct hw_interrupt_type ioapic_level_irq_type = {
- "IO-APIC-level",
- startup_level_ioapic_irq,
- shutdown_level_ioapic_irq,
- enable_level_ioapic_irq,
- disable_level_ioapic_irq,
- mask_and_ack_level_ioapic_irq,
- end_level_ioapic_irq,
- set_ioapic_affinity,
- };
- static inline void init_IO_APIC_traps(void)
- {
- int irq;
- /*
- * NOTE! The local APIC isn't very good at handling
- * multiple interrupts at the same interrupt level.
- * As the interrupt level is determined by taking the
- * vector number and shifting that right by 4, we
- * want to spread these out a bit so that they don't
- * all fall in the same interrupt level.
- *
- * Also, we've got to be careful not to trash gate
- * 0x80, because int 0x80 is hm, kind of importantish. ;)
- */
- for (irq = 0; irq < NR_IRQS ; irq++) {
- if (IO_APIC_IRQ(irq) && !IO_APIC_VECTOR(irq)) {
- /*
- * Hmm.. We don't have an entry for this,
- * so default to an old-fashioned 8259
- * interrupt if we can..
- */
- if (irq < 16)
- make_8259A_irq(irq);
- else
- /* Strange. Oh, well.. */
- irq_desc[irq].handler = &no_irq_type;
- }
- }
- }
- static void enable_lapic_irq (unsigned int irq)
- {
- unsigned long v;
- v = apic_read(APIC_LVT0);
- apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
- }
- static void disable_lapic_irq (unsigned int irq)
- {
- unsigned long v;
- v = apic_read(APIC_LVT0);
- apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
- }
- static void ack_lapic_irq (unsigned int irq)
- {
- ack_APIC_irq();
- }
- static void end_lapic_irq (unsigned int i) { /* nothing */ }
- static struct hw_interrupt_type lapic_irq_type = {
- "local-APIC-edge",
- NULL, /* startup_irq() not used for IRQ0 */
- NULL, /* shutdown_irq() not used for IRQ0 */
- enable_lapic_irq,
- disable_lapic_irq,
- ack_lapic_irq,
- end_lapic_irq
- };
- static 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);
- }
- static void setup_nmi (void)
- {
- /*
- * Dirty trick to enable the NMI watchdog ...
- * We put the 8259A master into AEOI mode and
- * unmask on all local APICs LVT0 as NMI.
- *
- * The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
- * is from Maciej W. Rozycki - so we do not have to EOI from
- * the NMI handler or the timer interrupt.
- */
- printk(KERN_INFO "activating NMI Watchdog ...");
- smp_call_function(enable_NMI_through_LVT0, NULL, 1, 1);
- enable_NMI_through_LVT0(NULL);
- printk(" done.n");
- }
- /*
- * This looks a bit hackish but it's about the only one way of sending
- * a few INTA cycles to 8259As and any associated glue logic. ICR does
- * not support the ExtINT mode, unfortunately. We need to send these
- * cycles as some i82489DX-based boards have glue logic that keeps the
- * 8259A interrupt line asserted until INTA. --macro
- */
- static inline void unlock_ExtINT_logic(void)
- {
- int pin, i;
- struct IO_APIC_route_entry entry0, entry1;
- unsigned char save_control, save_freq_select;
- unsigned long flags;
- pin = find_isa_irq_pin(8, mp_INT);
- if (pin == -1)
- return;
- spin_lock_irqsave(&ioapic_lock, flags);
- *(((int *)&entry0) + 1) = io_apic_read(0, 0x11 + 2 * pin);
- *(((int *)&entry0) + 0) = io_apic_read(0, 0x10 + 2 * pin);
- spin_unlock_irqrestore(&ioapic_lock, flags);
- clear_IO_APIC_pin(0, pin);
- memset(&entry1, 0, sizeof(entry1));
- entry1.dest_mode = 0; /* physical delivery */
- entry1.mask = 0; /* unmask IRQ now */
- entry1.dest.physical.physical_dest = hard_smp_processor_id();
- entry1.delivery_mode = dest_ExtINT;
- entry1.polarity = entry0.polarity;
- entry1.trigger = 0;
- entry1.vector = 0;
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
- io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
- save_control = CMOS_READ(RTC_CONTROL);
- save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
- CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
- RTC_FREQ_SELECT);
- CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
- i = 100;
- while (i-- > 0) {
- mdelay(10);
- if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
- i -= 10;
- }
- CMOS_WRITE(save_control, RTC_CONTROL);
- CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
- clear_IO_APIC_pin(0, pin);
- spin_lock_irqsave(&ioapic_lock, flags);
- io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
- io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
- spin_unlock_irqrestore(&ioapic_lock, flags);
- }
- /*
- * This code may look a bit paranoid, but it's supposed to cooperate with
- * a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
- * is so screwy. Thanks to Brian Perkins for testing/hacking this beast
- * fanatically on his truly buggy board.
- */
- static inline void check_timer(void)
- {
- extern int timer_ack;
- int pin1, pin2;
- int vector;
- /*
- * get/set the timer IRQ vector:
- */
- disable_8259A_irq(0);
- vector = assign_irq_vector(0);
- set_intr_gate(vector, interrupt[0]);
- /*
- * Subtle, code in do_timer_interrupt() expects an AEOI
- * mode for the 8259A whenever interrupts are routed
- * through I/O APICs. Also IRQ0 has to be enabled in
- * the 8259A which implies the virtual wire has to be
- * disabled in the local APIC.
- */
- apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
- init_8259A(1);
- timer_ack = 1;
- enable_8259A_irq(0);
- pin1 = find_isa_irq_pin(0, mp_INT);
- pin2 = find_isa_irq_pin(0, mp_ExtINT);
- printk(KERN_INFO "..TIMER: vector=0x%02X pin1=%d pin2=%dn", vector, pin1, pin2);
- if (pin1 != -1) {
- /*
- * Ok, does IRQ0 through the IOAPIC work?
- */
- unmask_IO_APIC_irq(0);
- if (timer_irq_works()) {
- if (nmi_watchdog == NMI_IO_APIC) {
- disable_8259A_irq(0);
- setup_nmi();
- enable_8259A_irq(0);
- check_nmi_watchdog();
- }
- return;
- }
- clear_IO_APIC_pin(0, pin1);
- printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to IO-APICn");
- }
- printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
- if (pin2 != -1) {
- printk("n..... (found pin %d) ...", pin2);
- /*
- * legacy devices should be connected to IO APIC #0
- */
- setup_ExtINT_IRQ0_pin(pin2, vector);
- if (timer_irq_works()) {
- printk("works.n");
- if (pin1 != -1)
- replace_pin_at_irq(0, 0, pin1, 0, pin2);
- else
- add_pin_to_irq(0, 0, pin2);
- if (nmi_watchdog == NMI_IO_APIC) {
- setup_nmi();
- check_nmi_watchdog();
- }
- return;
- }
- /*
- * Cleanup, just in case ...
- */
- clear_IO_APIC_pin(0, pin2);
- }
- printk(" failed.n");
- if (nmi_watchdog) {
- printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!n");
- nmi_watchdog = 0;
- }
- printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
- disable_8259A_irq(0);
- irq_desc[0].handler = &lapic_irq_type;
- apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
- enable_8259A_irq(0);
- if (timer_irq_works()) {
- printk(" works.n");
- return;
- }
- apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
- printk(" failed.n");
- printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
- init_8259A(0);
- make_8259A_irq(0);
- apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
- unlock_ExtINT_logic();
- if (timer_irq_works()) {
- printk(" works.n");
- return;
- }
- printk(" failed :(.n");
- panic("IO-APIC + timer doesn't work! pester mingo@redhat.com");
- }
- /*
- *
- * IRQ's that are handled by the old PIC in all cases:
- * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
- * Linux doesn't really care, as it's not actually used
- * for any interrupt handling anyway.
- * - There used to be IRQ13 here as well, but all
- * MPS-compliant must not use it for FPU coupling and we
- * want to use exception 16 anyway. And there are
- * systems who connect it to an I/O APIC for other uses.
- * Thus we don't mark it special any longer.
- *
- * Additionally, something is definitely wrong with irq9
- * on PIIX4 boards.
- */
- #define PIC_IRQS (1<<2)
- void __init setup_IO_APIC(void)
- {
- enable_IO_APIC();
- io_apic_irqs = ~PIC_IRQS;
- printk("ENABLING IO-APIC IRQsn");
- /*
- * Set up the IO-APIC IRQ routing table by parsing the MP-BIOS
- * mptable:
- */
- setup_ioapic_ids_from_mpc();
- sync_Arb_IDs();
- setup_IO_APIC_irqs();
- init_IO_APIC_traps();
- check_timer();
- print_IO_APIC();
- }