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         .mask = CPU_MASK_NONE,
  49         .name = "cascade",
  50 };
  51 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
  52         [0 ... IRQ0_VECTOR - 1] = -1,
  53         [IRQ0_VECTOR] = 0,
  54         [IRQ1_VECTOR] = 1,
  55         [IRQ2_VECTOR] = 2,
  56         [IRQ3_VECTOR] = 3,
  57         [IRQ4_VECTOR] = 4,
  58         [IRQ5_VECTOR] = 5,
  59         [IRQ6_VECTOR] = 6,
  60         [IRQ7_VECTOR] = 7,
  61         [IRQ8_VECTOR] = 8,
  62         [IRQ9_VECTOR] = 9,
  63         [IRQ10_VECTOR] = 10,
  64         [IRQ11_VECTOR] = 11,
  65         [IRQ12_VECTOR] = 12,
  66         [IRQ13_VECTOR] = 13,
  67         [IRQ14_VECTOR] = 14,
  68         [IRQ15_VECTOR] = 15,
  69         [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
  70 };
  71
  72 int vector_used_by_percpu_irq(unsigned int vector)
  73 {
  74         int cpu;
  75
  76         for_each_online_cpu(cpu) {
  77                 if (per_cpu(vector_irq, cpu)[vector] != -1)
  78                         return 1;
  79         }
  80
  81         return 0;
  82 }
  83
  84 static void __init init_ISA_irqs(void)
  85 {
  86         int i;
  87
  88         init_bsp_APIC();
  89         init_8259A(0);
  90
  91         for (i = 0; i < NR_IRQS_LEGACY; i++) {
  92                 struct irq_desc *desc = irq_to_desc(i);
  93
  94                 desc->status = IRQ_DISABLED;
  95                 desc->action = NULL;
  96                 desc->depth = 1;
  97
  98                 /*
  99                  * 16 old-style INTA-cycle interrupts:
 100                  */
 101                 set_irq_chip_and_handler_name(i, &i8259A_chip,
 102                                                       handle_level_irq, "XT");
 103         }
 104 }
 105
 106 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
 107
 108 static void __init smp_intr_init(void)
 109 {
 110 #ifdef CONFIG_SMP
 111         /*
 112          * The reschedule interrupt is a CPU-to-CPU reschedule-helper
 113          * IPI, driven by wakeup.
 114          */
 115         alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 116
 117         /* IPIs for invalidation */
 118         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
 119         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
 120         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
 121         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
 122         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
 123         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
 124         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
 125         alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
 126
 127         /* IPI for generic function call */
 128         alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 129
 130         /* IPI for generic single function call */
 131         alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
 132                         call_function_single_interrupt);
 133
 134         /* Low priority IPI to cleanup after moving an irq */
 135         set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
 136         set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
 137 #endif
 138 }
 139
 140 static void __init apic_intr_init(void)
 141 {
 142         smp_intr_init();
 143
 144         alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
 145         alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
 146
 147         /* self generated IPI for local APIC timer */
 148         alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 149
 150         /* generic IPI for platform specific use */
 151         alloc_intr_gate(GENERIC_INTERRUPT_VECTOR, generic_interrupt);
 152
 153         /* IPI vectors for APIC spurious and error interrupts */
 154         alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 155         alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 156 }
 157
 158 void __init native_init_IRQ(void)
 159 {
 160         int i;
 161
 162         init_ISA_irqs();
 163         /*
 164          * Cover the whole vector space, no vector can escape
 165          * us. (some of these will be overridden and become
 166          * 'special' SMP interrupts)
 167          */
 168         for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
 169                 int vector = FIRST_EXTERNAL_VECTOR + i;
 170                 if (vector != IA32_SYSCALL_VECTOR)
 171                         set_intr_gate(vector, interrupt[i]);
 172         }
 173
 174         apic_intr_init();
 175
 176         if (!acpi_ioapic)
 177                 setup_irq(2, &irq2);
 178 }