arch/i386/mach-default/setup.c

   1 /*
   2  *      Machine specific setup for generic
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/smp.h>
   7 #include <linux/init.h>
   8 #include <linux/irq.h>
   9 #include <linux/interrupt.h>
  10 #include <asm/acpi.h>
  11 #include <asm/arch_hooks.h>
  12
  13 /**
  14  * pre_intr_init_hook - initialisation prior to setting up interrupt vectors
  15  *
  16  * Description:
  17  *      Perform any necessary interrupt initialisation prior to setting up
  18  *      the "ordinary" interrupt call gates.  For legacy reasons, the ISA
  19  *      interrupts should be initialised here if the machine emulates a PC
  20  *      in any way.
  21  **/
  22 void __init pre_intr_init_hook(void)
  23 {
  24         init_ISA_irqs();
  25 }
  26
  27 /*
  28  * IRQ2 is cascade interrupt to second interrupt controller
  29  */
  30 static struct irqaction irq2 = { no_action, 0, CPU_MASK_NONE, "cascade", NULL, NULL};
  31
  32 /**
  33  * intr_init_hook - post gate setup interrupt initialisation
  34  *
  35  * Description:
  36  *      Fill in any interrupts that may have been left out by the general
  37  *      init_IRQ() routine.  interrupts having to do with the machine rather
  38  *      than the devices on the I/O bus (like APIC interrupts in intel MP
  39  *      systems) are started here.
  40  **/
  41 void __init intr_init_hook(void)
  42 {
  43 #ifdef CONFIG_X86_LOCAL_APIC
  44         apic_intr_init();
  45 #endif
  46
  47         if (!acpi_ioapic)
  48                 setup_irq(2, &irq2);
  49 }
  50
  51 /**
  52  * pre_setup_arch_hook - hook called prior to any setup_arch() execution
  53  *
  54  * Description:
  55  *      generally used to activate any machine specific identification
  56  *      routines that may be needed before setup_arch() runs.  On VISWS
  57  *      this is used to get the board revision and type.
  58  **/
  59 void __init pre_setup_arch_hook(void)
  60 {
  61 }
  62
  63 /**
  64  * trap_init_hook - initialise system specific traps
  65  *
  66  * Description:
  67  *      Called as the final act of trap_init().  Used in VISWS to initialise
  68  *      the various board specific APIC traps.
  69  **/
  70 void __init trap_init_hook(void)
  71 {
  72 }
  73
  74 static struct irqaction irq0  = { timer_interrupt, SA_INTERRUPT, CPU_MASK_NONE, "timer", NULL, NULL};
  75
  76 /**
  77  * time_init_hook - do any specific initialisations for the system timer.
  78  *
  79  * Description:
  80  *      Must plug the system timer interrupt source at HZ into the IRQ listed
  81  *      in irq_vectors.h:TIMER_IRQ
  82  **/
  83 void __init time_init_hook(void)
  84 {
  85         setup_irq(0, &irq0);
  86 }
  87
  88 #ifdef CONFIG_MCA
  89 /**
  90  * mca_nmi_hook - hook into MCA specific NMI chain
  91  *
  92  * Description:
  93  *      The MCA (Microchannel Arcitecture) has an NMI chain for NMI sources
  94  *      along the MCA bus.  Use this to hook into that chain if you will need
  95  *      it.
  96  **/
  97 void __init mca_nmi_hook(void)
  98 {
  99         /* If I recall correctly, there's a whole bunch of other things that
 100          * we can do to check for NMI problems, but that's all I know about
 101          * at the moment.
 102          */
 103
 104         printk("NMI generated from unknown source!\n");
 105 }
 106 #endif