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 #ifdef CONFIG_HOTPLUG_CPU
  14 #define DEFAULT_SEND_IPI        (1)
  15 #else
  16 #define DEFAULT_SEND_IPI        (0)
  17 #endif
  18
  19 int no_broadcast=DEFAULT_SEND_IPI;
  20
  21 /**
  22  * pre_intr_init_hook - initialisation prior to setting up interrupt vectors
  23  *
  24  * Description:
  25  *      Perform any necessary interrupt initialisation prior to setting up
  26  *      the "ordinary" interrupt call gates.  For legacy reasons, the ISA
  27  *      interrupts should be initialised here if the machine emulates a PC
  28  *      in any way.
  29  **/
  30 void __init pre_intr_init_hook(void)
  31 {
  32         init_ISA_irqs();
  33 }
  34
  35 /*
  36  * IRQ2 is cascade interrupt to second interrupt controller
  37  */
  38 static struct irqaction irq2 = {
  39         .handler = no_action,
  40         .mask = CPU_MASK_NONE,
  41         .name = "cascade",
  42 };
  43
  44 /**
  45  * intr_init_hook - post gate setup interrupt initialisation
  46  *
  47  * Description:
  48  *      Fill in any interrupts that may have been left out by the general
  49  *      init_IRQ() routine.  interrupts having to do with the machine rather
  50  *      than the devices on the I/O bus (like APIC interrupts in intel MP
  51  *      systems) are started here.
  52  **/
  53 void __init intr_init_hook(void)
  54 {
  55 #ifdef CONFIG_X86_LOCAL_APIC
  56         apic_intr_init();
  57 #endif
  58
  59         if (!acpi_ioapic)
  60                 setup_irq(2, &irq2);
  61 }
  62
  63 /**
  64  * pre_setup_arch_hook - hook called prior to any setup_arch() execution
  65  *
  66  * Description:
  67  *      generally used to activate any machine specific identification
  68  *      routines that may be needed before setup_arch() runs.  On VISWS
  69  *      this is used to get the board revision and type.
  70  **/
  71 void __init pre_setup_arch_hook(void)
  72 {
  73 }
  74
  75 /**
  76  * trap_init_hook - initialise system specific traps
  77  *
  78  * Description:
  79  *      Called as the final act of trap_init().  Used in VISWS to initialise
  80  *      the various board specific APIC traps.
  81  **/
  82 void __init trap_init_hook(void)
  83 {
  84 }
  85
  86 static struct irqaction irq0  = {
  87         .handler = timer_interrupt,
  88         .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL,
  89         .mask = CPU_MASK_NONE,
  90         .name = "timer"
  91 };
  92
  93 /**
  94  * time_init_hook - do any specific initialisations for the system timer.
  95  *
  96  * Description:
  97  *      Must plug the system timer interrupt source at HZ into the IRQ listed
  98  *      in irq_vectors.h:TIMER_IRQ
  99  **/
 100 void __init time_init_hook(void)
 101 {
 102         irq0.mask = cpumask_of_cpu(0);
 103         setup_irq(0, &irq0);
 104 }
 105
 106 #ifdef CONFIG_MCA
 107 /**
 108  * mca_nmi_hook - hook into MCA specific NMI chain
 109  *
 110  * Description:
 111  *      The MCA (Microchannel Architecture) has an NMI chain for NMI sources
 112  *      along the MCA bus.  Use this to hook into that chain if you will need
 113  *      it.
 114  **/
 115 void mca_nmi_hook(void)
 116 {
 117         /* If I recall correctly, there's a whole bunch of other things that
 118          * we can do to check for NMI problems, but that's all I know about
 119          * at the moment.
 120          */
 121
 122         printk("NMI generated from unknown source!\n");
 123 }
 124 #endif
 125
 126 static __init int no_ipi_broadcast(char *str)
 127 {
 128         get_option(&str, &no_broadcast);
 129         printk ("Using %s mode\n", no_broadcast ? "No IPI Broadcast" :
 130                                                                                         "IPI Broadcast");
 131         return 1;
 132 }
 133
 134 __setup("no_ipi_broadcast=", no_ipi_broadcast);
 135
 136 static int __init print_ipi_mode(void)
 137 {
 138         printk ("Using IPI %s mode\n", no_broadcast ? "No-Shortcut" :
 139                                                                                         "Shortcut");
 140         return 0;
 141 }
 142
 143 late_initcall(print_ipi_mode);
 144
 145 /**
 146  * machine_specific_memory_setup - Hook for machine specific memory setup.
 147  *
 148  * Description:
 149  *      This is included late in kernel/setup.c so that it can make
 150  *      use of all of the static functions.
 151  **/
 152
 153 char * __init machine_specific_memory_setup(void)
 154 {
 155         char *who;
 156
 157
 158         who = "BIOS-e820";
 159
 160         /*
 161          * Try to copy the BIOS-supplied E820-map.
 162          *
 163          * Otherwise fake a memory map; one section from 0k->640k,
 164          * the next section from 1mb->appropriate_mem_k
 165          */
 166         sanitize_e820_map(boot_params.e820_map, &boot_params.e820_entries);
 167         if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries)
 168             < 0) {
 169                 unsigned long mem_size;
 170
 171                 /* compare results from other methods and take the greater */
 172                 if (boot_params.alt_mem_k
 173                     < boot_params.screen_info.ext_mem_k) {
 174                         mem_size = boot_params.screen_info.ext_mem_k;
 175                         who = "BIOS-88";
 176                 } else {
 177                         mem_size = boot_params.alt_mem_k;
 178                         who = "BIOS-e801";
 179                 }
 180
 181                 e820.nr_map = 0;
 182                 add_memory_region(0, LOWMEMSIZE(), E820_RAM);
 183                 add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
 184         }
 185         return who;
 186 }