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/interrupt.h>
   9 #include <asm/acpi.h>
  10 #include <asm/arch_hooks.h>
  11
  12 #ifdef CONFIG_HOTPLUG_CPU
  13 #define DEFAULT_SEND_IPI        (1)
  14 #else
  15 #define DEFAULT_SEND_IPI        (0)
  16 #endif
  17
  18 int no_broadcast=DEFAULT_SEND_IPI;
  19
  20 /**
  21  * pre_intr_init_hook - initialisation prior to setting up interrupt vectors
  22  *
  23  * Description:
  24  *      Perform any necessary interrupt initialisation prior to setting up
  25  *      the "ordinary" interrupt call gates.  For legacy reasons, the ISA
  26  *      interrupts should be initialised here if the machine emulates a PC
  27  *      in any way.
  28  **/
  29 void __init pre_intr_init_hook(void)
  30 {
  31         init_ISA_irqs();
  32 }
  33
  34 /*
  35  * IRQ2 is cascade interrupt to second interrupt controller
  36  */
  37 static struct irqaction irq2 = { no_action, 0, CPU_MASK_NONE, "cascade", NULL, NULL};
  38
  39 /**
  40  * intr_init_hook - post gate setup interrupt initialisation
  41  *
  42  * Description:
  43  *      Fill in any interrupts that may have been left out by the general
  44  *      init_IRQ() routine.  interrupts having to do with the machine rather
  45  *      than the devices on the I/O bus (like APIC interrupts in intel MP
  46  *      systems) are started here.
  47  **/
  48 void __init intr_init_hook(void)
  49 {
  50 #ifdef CONFIG_X86_LOCAL_APIC
  51         apic_intr_init();
  52 #endif
  53
  54         if (!acpi_ioapic)
  55                 setup_irq(2, &irq2);
  56 }
  57
  58 /**
  59  * pre_setup_arch_hook - hook called prior to any setup_arch() execution
  60  *
  61  * Description:
  62  *      generally used to activate any machine specific identification
  63  *      routines that may be needed before setup_arch() runs.  On VISWS
  64  *      this is used to get the board revision and type.
  65  **/
  66 void __init pre_setup_arch_hook(void)
  67 {
  68 }
  69
  70 /**
  71  * trap_init_hook - initialise system specific traps
  72  *
  73  * Description:
  74  *      Called as the final act of trap_init().  Used in VISWS to initialise
  75  *      the various board specific APIC traps.
  76  **/
  77 void __init trap_init_hook(void)
  78 {
  79 }
  80
  81 static struct irqaction irq0  = { timer_interrupt, SA_INTERRUPT, CPU_MASK_NONE, "timer", NULL, NULL};
  82
  83 /**
  84  * time_init_hook - do any specific initialisations for the system timer.
  85  *
  86  * Description:
  87  *      Must plug the system timer interrupt source at HZ into the IRQ listed
  88  *      in irq_vectors.h:TIMER_IRQ
  89  **/
  90 void __init time_init_hook(void)
  91 {
  92         setup_irq(0, &irq0);
  93 }
  94
  95 #ifdef CONFIG_MCA
  96 /**
  97  * mca_nmi_hook - hook into MCA specific NMI chain
  98  *
  99  * Description:
 100  *      The MCA (Microchannel Arcitecture) has an NMI chain for NMI sources
 101  *      along the MCA bus.  Use this to hook into that chain if you will need
 102  *      it.
 103  **/
 104 void __init mca_nmi_hook(void)
 105 {
 106         /* If I recall correctly, there's a whole bunch of other things that
 107          * we can do to check for NMI problems, but that's all I know about
 108          * at the moment.
 109          */
 110
 111         printk("NMI generated from unknown source!\n");
 112 }
 113 #endif
 114
 115 static __init int no_ipi_broadcast(char *str)
 116 {
 117         get_option(&str, &no_broadcast);
 118         printk ("Using %s mode\n", no_broadcast ? "No IPI Broadcast" :
 119                                                                                         "IPI Broadcast");
 120         return 1;
 121 }
 122
 123 __setup("no_ipi_broadcast", no_ipi_broadcast);
 124
 125 static int __init print_ipi_mode(void)
 126 {
 127         printk ("Using IPI %s mode\n", no_broadcast ? "No-Shortcut" :
 128                                                                                         "Shortcut");
 129         return 0;
 130 }
 131
 132 late_initcall(print_ipi_mode);