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 * Alpha specific irq code.

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>

#include <asm/machvec.h>
#include <asm/dma.h>

#include "proto.h"
#include "irq_impl.h"

/* Hack minimum IPL during interrupt processing for broken hardware.  */
int __min_ipl;

 * Performance counter hook.  A module can override this to
 * do something useful.
static void
dummy_perf(unsigned long vector, struct pt_regs *regs)
      printk(KERN_CRIT "Performance counter interrupt!\n");

void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;

 * The main interrupt entry point.

asmlinkage void 
do_entInt(unsigned long type, unsigned long vector,
        unsigned long la_ptr, struct pt_regs *regs)
      switch (type) {
      case 0:
            printk(KERN_CRIT "Interprocessor interrupt? "
                   "You must be kidding!\n");
      case 1:
            long cpu;

            cpu = smp_processor_id();
            if (cpu != boot_cpuid) {
            } else {
                  handle_irq(RTC_IRQ, regs);
            handle_irq(RTC_IRQ, regs);
      case 2:
            alpha_mv.machine_check(vector, la_ptr, regs);
      case 3:
            alpha_mv.device_interrupt(vector, regs);
      case 4:
            perf_irq(la_ptr, regs);
            printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
                   type, vector);
      printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);

void __init
      outb(0, DMA1_RESET_REG);
      outb(0, DMA2_RESET_REG);
      outb(0, DMA1_CLR_MASK_REG);
      outb(0, DMA2_CLR_MASK_REG);

void __init
      /* Just in case the platform init_irq() causes interrupts/mchecks
         (as is the case with RAWHIDE, at least).  */
      wrent(entInt, 0);


 * machine error checks
#define MCHK_K_TPERR           0x0080
#define MCHK_K_TCPERR          0x0082
#define MCHK_K_HERR            0x0084
#define MCHK_K_ECC_C           0x0086
#define MCHK_K_ECC_NC          0x0088
#define MCHK_K_OS_BUGCHECK     0x008A
#define MCHK_K_PAL_BUGCHECK    0x0090

#ifndef CONFIG_SMP
struct mcheck_info __mcheck_info;

process_mcheck_info(unsigned long vector, unsigned long la_ptr,
                struct pt_regs *regs, const char *machine,
                int expected)
      struct el_common *mchk_header;
      const char *reason;

       * See if the machine check is due to a badaddr() and if so,
       * ignore it.

      if (alpha_verbose_mcheck > 1) {
            printk(KERN_CRIT "%s machine check %s\n", machine,
                   expected ? "expected." : "NOT expected!!!");

      if (expected) {
            int cpu = smp_processor_id();
            mcheck_expected(cpu) = 0;
            mcheck_taken(cpu) = 1;

      mchk_header = (struct el_common *)la_ptr;

      printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
             machine, vector, regs->pc, mchk_header->code);

      switch (mchk_header->code) {
      /* Machine check reasons.  Defined according to PALcode sources.  */
      case 0x80: reason = "tag parity error"; break;
      case 0x82: reason = "tag control parity error"; break;
      case 0x84: reason = "generic hard error"; break;
      case 0x86: reason = "correctable ECC error"; break;
      case 0x88: reason = "uncorrectable ECC error"; break;
      case 0x8A: reason = "OS-specific PAL bugcheck"; break;
      case 0x90: reason = "callsys in kernel mode"; break;
      case 0x96: reason = "i-cache read retryable error"; break;
      case 0x98: reason = "processor detected hard error"; break;
      /* System specific (these are for Alcor, at least): */
      case 0x202: reason = "system detected hard error"; break;
      case 0x203: reason = "system detected uncorrectable ECC error"; break;
      case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
      case 0x205: reason = "parity error detected by core logic"; break;
      case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
      case 0x207: reason = "non-existent memory error"; break;
      case 0x208: reason = "MCHK_K_DCSR"; break;
      case 0x209: reason = "PCI SERR detected"; break;
      case 0x20b: reason = "PCI data parity error detected"; break;
      case 0x20d: reason = "PCI address parity error detected"; break;
      case 0x20f: reason = "PCI master abort error"; break;
      case 0x211: reason = "PCI target abort error"; break;
      case 0x213: reason = "scatter/gather PTE invalid error"; break;
      case 0x215: reason = "flash ROM write error"; break;
      case 0x217: reason = "IOA timeout detected"; break;
      case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
      case 0x21b: reason = "EISA fail-safe timer timeout"; break;
      case 0x21d: reason = "EISA bus time-out"; break;
      case 0x21f: reason = "EISA software generated NMI"; break;
      case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
      default: reason = "unknown"; break;

      printk(KERN_CRIT "machine check type: %s%s\n",
             reason, mchk_header->retry ? " (retryable)" : "");

      dik_show_regs(regs, NULL);

      if (alpha_verbose_mcheck > 1) {
            /* Dump the logout area to give all info.  */
            unsigned long *ptr = (unsigned long *)la_ptr;
            long i;
            for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
                  printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
                         i*sizeof(long), ptr[i], ptr[i+1]);

 * The special RTC interrupt type.  The interrupt itself was
 * processed by PALcode, and comes in via entInt vector 1.

static void rtc_enable_disable(unsigned int irq) { }
static unsigned int rtc_startup(unsigned int irq) { return 0; }

struct irqaction timer_irqaction = {
      .handler    = timer_interrupt,
      .flags            = IRQF_DISABLED,
      .name       = "timer",

static struct hw_interrupt_type rtc_irq_type = {
      .typename   = "RTC",
      .startup    = rtc_startup,
      .shutdown   = rtc_enable_disable,
      .enable           = rtc_enable_disable,
      .disable    = rtc_enable_disable,
      .ack        = rtc_enable_disable,
      .end        = rtc_enable_disable,

void __init
      irq_desc[RTC_IRQ].status = IRQ_DISABLED;
      irq_desc[RTC_IRQ].chip = &rtc_irq_type;
      setup_irq(RTC_IRQ, &timer_irqaction);

/* Dummy irqactions.  */
struct irqaction isa_cascade_irqaction = {
      .handler    = no_action,
      .name       = "isa-cascade"

struct irqaction timer_cascade_irqaction = {
      .handler    = no_action,
      .name       = "timer-cascade"

struct irqaction halt_switch_irqaction = {
      .handler    = no_action,
      .name       = "halt-switch"

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