arch/x86/kernel/i8259_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
  15 #include <asm/acpi.h>
  16 #include <asm/atomic.h>
  17 #include <asm/system.h>
  18 #include <asm/io.h>
  19 #include <asm/hw_irq.h>
  20 #include <asm/pgtable.h>
  21 #include <asm/delay.h>
  22 #include <asm/desc.h>
  23 #include <asm/apic.h>
  24 #include <asm/i8259.h>
  25
  26 /*
  27  * Common place to define all x86 IRQ vectors
  28  *
  29  * This builds up the IRQ handler stubs using some ugly macros in irq.h
  30  *
  31  * These macros create the low-level assembly IRQ routines that save
  32  * register context and call do_IRQ(). do_IRQ() then does all the
  33  * operations that are needed to keep the AT (or SMP IOAPIC)
  34  * interrupt-controller happy.
  35  */
  36
  37 #define BI(x,y) \
  38         BUILD_IRQ(x##y)
  39
  40 #define BUILD_16_IRQS(x) \
  41         BI(x,0) BI(x,1) BI(x,2) BI(x,3) \
  42         BI(x,4) BI(x,5) BI(x,6) BI(x,7) \
  43         BI(x,8) BI(x,9) BI(x,a) BI(x,b) \
  44         BI(x,c) BI(x,d) BI(x,e) BI(x,f)
  45
  46 /*
  47  * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
  48  * (these are usually mapped to vectors 0x30-0x3f)
  49  */
  50
  51 /*
  52  * The IO-APIC gives us many more interrupt sources. Most of these
  53  * are unused but an SMP system is supposed to have enough memory ...
  54  * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
  55  * across the spectrum, so we really want to be prepared to get all
  56  * of these. Plus, more powerful systems might have more than 64
  57  * IO-APIC registers.
  58  *
  59  * (these are usually mapped into the 0x30-0xff vector range)
  60  */
  61                                       BUILD_16_IRQS(0x2) BUILD_16_IRQS(0x3)
  62 BUILD_16_IRQS(0x4) BUILD_16_IRQS(0x5) BUILD_16_IRQS(0x6) BUILD_16_IRQS(0x7)
  63 BUILD_16_IRQS(0x8) BUILD_16_IRQS(0x9) BUILD_16_IRQS(0xa) BUILD_16_IRQS(0xb)
  64 BUILD_16_IRQS(0xc) BUILD_16_IRQS(0xd) BUILD_16_IRQS(0xe) BUILD_16_IRQS(0xf)
  65
  66 #undef BUILD_16_IRQS
  67 #undef BI
  68
  69
  70 #define IRQ(x,y) \
  71         IRQ##x##y##_interrupt
  72
  73 #define IRQLIST_16(x) \
  74         IRQ(x,0), IRQ(x,1), IRQ(x,2), IRQ(x,3), \
  75         IRQ(x,4), IRQ(x,5), IRQ(x,6), IRQ(x,7), \
  76         IRQ(x,8), IRQ(x,9), IRQ(x,a), IRQ(x,b), \
  77         IRQ(x,c), IRQ(x,d), IRQ(x,e), IRQ(x,f)
  78
  79 /* for the irq vectors */
  80 static void (*__initdata interrupt[NR_VECTORS - FIRST_EXTERNAL_VECTOR])(void) = {
  81                                           IRQLIST_16(0x2), IRQLIST_16(0x3),
  82         IRQLIST_16(0x4), IRQLIST_16(0x5), IRQLIST_16(0x6), IRQLIST_16(0x7),
  83         IRQLIST_16(0x8), IRQLIST_16(0x9), IRQLIST_16(0xa), IRQLIST_16(0xb),
  84         IRQLIST_16(0xc), IRQLIST_16(0xd), IRQLIST_16(0xe), IRQLIST_16(0xf)
  85 };
  86
  87 #undef IRQ
  88 #undef IRQLIST_16
  89
  90
  91
  92
  93 /*
  94  * IRQ2 is cascade interrupt to second interrupt controller
  95  */
  96
  97 static struct irqaction irq2 = {
  98         .handler = no_action,
  99         .mask = CPU_MASK_NONE,
 100         .name = "cascade",
 101 };
 102 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
 103         [0 ... IRQ0_VECTOR - 1] = -1,
 104         [IRQ0_VECTOR] = 0,
 105         [IRQ1_VECTOR] = 1,
 106         [IRQ2_VECTOR] = 2,
 107         [IRQ3_VECTOR] = 3,
 108         [IRQ4_VECTOR] = 4,
 109         [IRQ5_VECTOR] = 5,
 110         [IRQ6_VECTOR] = 6,
 111         [IRQ7_VECTOR] = 7,
 112         [IRQ8_VECTOR] = 8,
 113         [IRQ9_VECTOR] = 9,
 114         [IRQ10_VECTOR] = 10,
 115         [IRQ11_VECTOR] = 11,
 116         [IRQ12_VECTOR] = 12,
 117         [IRQ13_VECTOR] = 13,
 118         [IRQ14_VECTOR] = 14,
 119         [IRQ15_VECTOR] = 15,
 120         [IRQ15_VECTOR + 1 ... NR_VECTORS - 1] = -1
 121 };
 122
 123 void __init init_ISA_irqs (void)
 124 {
 125         int i;
 126
 127         init_bsp_APIC();
 128         init_8259A(0);
 129
 130         for (i = 0; i < NR_IRQS; i++) {
 131                 irq_desc[i].status = IRQ_DISABLED;
 132                 irq_desc[i].action = NULL;
 133                 irq_desc[i].depth = 1;
 134
 135                 if (i < 16) {
 136                         /*
 137                          * 16 old-style INTA-cycle interrupts:
 138                          */
 139                         set_irq_chip_and_handler_name(i, &i8259A_chip,
 140                                                       handle_level_irq, "XT");
 141                 } else {
 142                         /*
 143                          * 'high' PCI IRQs filled in on demand
 144                          */
 145                         irq_desc[i].chip = &no_irq_chip;
 146                 }
 147         }
 148 }
 149
 150 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
 151
 152 void __init native_init_IRQ(void)
 153 {
 154         int i;
 155
 156         init_ISA_irqs();
 157         /*
 158          * Cover the whole vector space, no vector can escape
 159          * us. (some of these will be overridden and become
 160          * 'special' SMP interrupts)
 161          */
 162         for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
 163                 int vector = FIRST_EXTERNAL_VECTOR + i;
 164                 if (vector != IA32_SYSCALL_VECTOR)
 165                         set_intr_gate(vector, interrupt[i]);
 166         }
 167
 168 #ifdef CONFIG_SMP
 169         /*
 170          * The reschedule interrupt is a CPU-to-CPU reschedule-helper
 171          * IPI, driven by wakeup.
 172          */
 173         set_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
 174
 175         /* IPIs for invalidation */
 176         set_intr_gate(INVALIDATE_TLB_VECTOR_START+0, invalidate_interrupt0);
 177         set_intr_gate(INVALIDATE_TLB_VECTOR_START+1, invalidate_interrupt1);
 178         set_intr_gate(INVALIDATE_TLB_VECTOR_START+2, invalidate_interrupt2);
 179         set_intr_gate(INVALIDATE_TLB_VECTOR_START+3, invalidate_interrupt3);
 180         set_intr_gate(INVALIDATE_TLB_VECTOR_START+4, invalidate_interrupt4);
 181         set_intr_gate(INVALIDATE_TLB_VECTOR_START+5, invalidate_interrupt5);
 182         set_intr_gate(INVALIDATE_TLB_VECTOR_START+6, invalidate_interrupt6);
 183         set_intr_gate(INVALIDATE_TLB_VECTOR_START+7, invalidate_interrupt7);
 184
 185         /* IPI for generic function call */
 186         set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 187
 188         /* Low priority IPI to cleanup after moving an irq */
 189         set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
 190 #endif
 191         set_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
 192         set_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
 193
 194         /* self generated IPI for local APIC timer */
 195         set_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 196
 197         /* IPI vectors for APIC spurious and error interrupts */
 198         set_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 199         set_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 200
 201         if (!acpi_ioapic)
 202                 setup_irq(2, &irq2);
 203 }