arch/x86/mach-default/setup.c

   1 /*
   2  *      Machine specific setup for generic
   3  */
   4
   5 #include <linux/smp.h>
   6 #include <linux/init.h>
   7 #include <linux/interrupt.h>
   8 #include <asm/acpi.h>
   9 #include <asm/arch_hooks.h>
  10 #include <asm/e820.h>
  11 #include <asm/setup.h>
  12
  13 #include <mach_ipi.h>
  14
  15 #ifdef CONFIG_HOTPLUG_CPU
  16 #define DEFAULT_SEND_IPI        (1)
  17 #else
  18 #define DEFAULT_SEND_IPI        (0)
  19 #endif
  20
  21 int no_broadcast = DEFAULT_SEND_IPI;
  22
  23 /**
  24  * pre_intr_init_hook - initialisation prior to setting up interrupt vectors
  25  *
  26  * Description:
  27  *      Perform any necessary interrupt initialisation prior to setting up
  28  *      the "ordinary" interrupt call gates.  For legacy reasons, the ISA
  29  *      interrupts should be initialised here if the machine emulates a PC
  30  *      in any way.
  31  **/
  32 void __init pre_intr_init_hook(void)
  33 {
  34         if (x86_quirks->arch_pre_intr_init) {
  35                 if (x86_quirks->arch_pre_intr_init())
  36                         return;
  37         }
  38         init_ISA_irqs();
  39 }
  40
  41 /*
  42  * IRQ2 is cascade interrupt to second interrupt controller
  43  */
  44 static struct irqaction irq2 = {
  45         .handler = no_action,
  46         .mask = CPU_MASK_NONE,
  47         .name = "cascade",
  48 };
  49
  50 /**
  51  * intr_init_hook - post gate setup interrupt initialisation
  52  *
  53  * Description:
  54  *      Fill in any interrupts that may have been left out by the general
  55  *      init_IRQ() routine.  interrupts having to do with the machine rather
  56  *      than the devices on the I/O bus (like APIC interrupts in intel MP
  57  *      systems) are started here.
  58  **/
  59 void __init intr_init_hook(void)
  60 {
  61         if (x86_quirks->arch_intr_init) {
  62                 if (x86_quirks->arch_intr_init())
  63                         return;
  64         }
  65         if (!acpi_ioapic)
  66                 setup_irq(2, &irq2);
  67
  68 }
  69
  70 /**
  71  * pre_setup_arch_hook - hook called prior to any setup_arch() execution
  72  *
  73  * Description:
  74  *      generally used to activate any machine specific identification
  75  *      routines that may be needed before setup_arch() runs.  On Voyager
  76  *      this is used to get the board revision and type.
  77  **/
  78 void __init pre_setup_arch_hook(void)
  79 {
  80 }
  81
  82 /**
  83  * trap_init_hook - initialise system specific traps
  84  *
  85  * Description:
  86  *      Called as the final act of trap_init().  Used in VISWS to initialise
  87  *      the various board specific APIC traps.
  88  **/
  89 void __init trap_init_hook(void)
  90 {
  91         if (x86_quirks->arch_trap_init) {
  92                 if (x86_quirks->arch_trap_init())
  93                         return;
  94         }
  95 }
  96
  97 static struct irqaction irq0  = {
  98         .handler = timer_interrupt,
  99         .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
 100         .mask = CPU_MASK_NONE,
 101         .name = "timer"
 102 };
 103
 104 /**
 105  * pre_time_init_hook - do any specific initialisations before.
 106  *
 107  **/
 108 void __init pre_time_init_hook(void)
 109 {
 110         if (x86_quirks->arch_pre_time_init)
 111                 x86_quirks->arch_pre_time_init();
 112 }
 113
 114 /**
 115  * time_init_hook - do any specific initialisations for the system timer.
 116  *
 117  * Description:
 118  *      Must plug the system timer interrupt source at HZ into the IRQ listed
 119  *      in irq_vectors.h:TIMER_IRQ
 120  **/
 121 void __init time_init_hook(void)
 122 {
 123         if (x86_quirks->arch_time_init) {
 124                 /*
 125                  * A nonzero return code does not mean failure, it means
 126                  * that the architecture quirk does not want any
 127                  * generic (timer) setup to be performed after this:
 128                  */
 129                 if (x86_quirks->arch_time_init())
 130                         return;
 131         }
 132
 133         irq0.mask = cpumask_of_cpu(0);
 134         setup_irq(0, &irq0);
 135 }
 136
 137 #ifdef CONFIG_MCA
 138 /**
 139  * mca_nmi_hook - hook into MCA specific NMI chain
 140  *
 141  * Description:
 142  *      The MCA (Microchannel Architecture) has an NMI chain for NMI sources
 143  *      along the MCA bus.  Use this to hook into that chain if you will need
 144  *      it.
 145  **/
 146 void mca_nmi_hook(void)
 147 {
 148         /*
 149          * If I recall correctly, there's a whole bunch of other things that
 150          * we can do to check for NMI problems, but that's all I know about
 151          * at the moment.
 152          */
 153         pr_warning("NMI generated from unknown source!\n");
 154 }
 155 #endif
 156
 157 static __init int no_ipi_broadcast(char *str)
 158 {
 159         get_option(&str, &no_broadcast);
 160         pr_info("Using %s mode\n",
 161                 no_broadcast ? "No IPI Broadcast" : "IPI Broadcast");
 162         return 1;
 163 }
 164 __setup("no_ipi_broadcast=", no_ipi_broadcast);
 165
 166 static int __init print_ipi_mode(void)
 167 {
 168         pr_info("Using IPI %s mode\n",
 169                 no_broadcast ? "No-Shortcut" : "Shortcut");
 170         return 0;
 171 }
 172
 173 late_initcall(print_ipi_mode);
 174