arch/x86/kernel/irqinit_64.c

   1 #include <linux/linkage.h>
   2 #include <linux/errno.h>
   3 #include <linux/signal.h>
   4 #include <linux/sched.h>
   5 #include <linux/ioport.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/timex.h>
   8 #include <linux/slab.h>
   9 #include <linux/random.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel_stat.h>
  12 #include <linux/sysdev.h>
  13 #include <linux/bitops.h>
  14 #include <linux/acpi.h>
  15 #include <linux/io.h>
  16 #include <linux/delay.h>
  17
  18 #include <asm/atomic.h>
  19 #include <asm/system.h>
  20 #include <asm/hw_irq.h>
  21 #include <asm/pgtable.h>
  22 #include <asm/desc.h>
  23 #include <asm/apic.h>
  24 #include <asm/i8259.h>
  25
  26 /*
  27  * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
  28  * (these are usually mapped to vectors 0x30-0x3f)
  29  */
  30
  31 /*
  32  * The IO-APIC gives us many more interrupt sources. Most of these
  33  * are unused but an SMP system is supposed to have enough memory ...
  34  * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
  35  * across the spectrum, so we really want to be prepared to get all
  36  * of these. Plus, more powerful systems might have more than 64
  37  * IO-APIC registers.
  38  *
  39  * (these are usually mapped into the 0x30-0xff vector range)
  40  */
  41
  42 /*
  43  * IRQ2 is cascade interrupt to second interrupt controller
  44  */
  45
  46 static struct irqaction irq2 = {
  47         .handler = no_action,
  48         .name = "cascade",
  49 };
  50 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
  51         [0 ... IRQ0_VECTOR - 1] = -1,
  52         [IRQ0_VECTOR] = 0,
  53         [IRQ1_VECTOR] = 1,
  54         [IRQ2_VECTOR] = 2,
  55         [IRQ3_VECTOR] = 3,
  56         [IRQ4_VECTOR] = 4,
  57         [IRQ5_VECTOR] = 5,
  58         [IRQ6_VECTOR] = 6,
  59         [IRQ7_VECTOR] = 7,
  60         [IRQ8_VECTOR] = 8,
  61         [IRQ9_VECTOR] = 9,
  62         [IRQ10_VECTOR] = 10,
  63         [IRQ11_VECTOR] = 11,
  64         [IRQ12_VECTOR] = 12,
  65         [IRQ13_VECTOR] = 13,
  66         [IRQ14_VECTOR] = 14,
  67         [IRQ15_VECTOR] = 15,
  68         [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
  69 };
  70
  71 int vector_used_by_percpu_irq(unsigned int vector)
  72 {
  73         int cpu;
  74
  75         for_each_online_cpu(cpu) {
  76                 if (per_cpu(vector_irq, cpu)[vector] != -1)
  77                         return 1;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static void __init init_ISA_irqs(void)
  84 {
  85         int i;
  86
  87         init_bsp_APIC();
  88         init_8259A(0);
  89
  90         for (i = 0; i < NR_IRQS_LEGACY; i++) {
  91                 struct irq_desc *desc = irq_to_desc(i);
  92
  93                 desc->status = IRQ_DISABLED;
  94                 desc->action = NULL;
  95                 desc->depth = 1;
  96
  97                 /*
  98                  * 16 old-style INTA-cycle interrupts:
  99                  */
 100                 set_irq_chip_and_handler_name(i, &i8259A_chip,
 101                                                       handle_level_irq, "XT");
 102         }
 103 }
 104
 105 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
 106
 107 static void __init smp_intr_init(void)
 108 {
 109 #ifdef CONFIG_SMP
 110         /*
 111          * The reschedule interrupt is a CPU-to-CPU reschedule-helper
 112          * IPI, driven by wakeup.
 113          */
 114         alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 115
 116         /* IPIs for invalidation */
 117         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
 118         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
 119         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
 120         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
 121         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
 122         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
 123         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
 124         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
 125
 126         /* IPI for generic function call */
 127         alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 128
 129         /* IPI for generic single function call */
 130         alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
 131                         call_function_single_interrupt);
 132
 133         /* Low priority IPI to cleanup after moving an irq */
 134         set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
 135         set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
 136 #endif
 137 }
 138
 139 static void __init apic_intr_init(void)
 140 {
 141         smp_intr_init();
 142
 143         alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
 144         alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
 145
 146         /* self generated IPI for local APIC timer */
 147         alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 148
 149         /* generic IPI for platform specific use */
 150         alloc_intr_gate(GENERIC_INTERRUPT_VECTOR, generic_interrupt);
 151
 152         /* IPI vectors for APIC spurious and error interrupts */
 153         alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 154         alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 155 }
 156
 157 void __init native_init_IRQ(void)
 158 {
 159         int i;
 160
 161         init_ISA_irqs();
 162         /*
 163          * Cover the whole vector space, no vector can escape
 164          * us. (some of these will be overridden and become
 165          * 'special' SMP interrupts)
 166          */
 167         for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
 168                 int vector = FIRST_EXTERNAL_VECTOR + i;
 169                 if (vector != IA32_SYSCALL_VECTOR)
 170                         set_intr_gate(vector, interrupt[i]);
 171         }
 172
 173         apic_intr_init();
 174
 175         if (!acpi_ioapic)
 176                 setup_irq(2, &irq2);
 177 }