LXR linux/arch/i386/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
  19int 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 **/
  30void __init pre_intr_init_hook(void)
  31{
  32        init_ISA_irqs();
  33}
  34
  35/*
  36 * IRQ2 is cascade interrupt to second interrupt controller
  37 */
  38static struct irqaction irq2 = { no_action, 0, CPU_MASK_NONE, "cascade", NULL, NULL};
  39
  40/**
  41 * intr_init_hook - post gate setup interrupt initialisation
  42 *
  43 * Description:
  44 *      Fill in any interrupts that may have been left out by the general
  45 *      init_IRQ() routine.  interrupts having to do with the machine rather
  46 *      than the devices on the I/O bus (like APIC interrupts in intel MP
  47 *      systems) are started here.
  48 **/
  49void __init intr_init_hook(void)
  50{
  51#ifdef CONFIG_X86_LOCAL_APIC
  52        apic_intr_init();
  53#endif
  54
  55        if (!acpi_ioapic)
  56                setup_irq(2, &irq2);
  57}
  58
  59/**
  60 * pre_setup_arch_hook - hook called prior to any setup_arch() execution
  61 *
  62 * Description:
  63 *      generally used to activate any machine specific identification
  64 *      routines that may be needed before setup_arch() runs.  On VISWS
  65 *      this is used to get the board revision and type.
  66 **/
  67void __init pre_setup_arch_hook(void)
  68{
  69}
  70
  71/**
  72 * trap_init_hook - initialise system specific traps
  73 *
  74 * Description:
  75 *      Called as the final act of trap_init().  Used in VISWS to initialise
  76 *      the various board specific APIC traps.
  77 **/
  78void __init trap_init_hook(void)
  79{
  80}
  81
  82static struct irqaction irq0  = {
  83        .handler = timer_interrupt,
  84        .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL,
  85        .mask = CPU_MASK_NONE,
  86        .name = "timer"
  87};
  88
  89/**
  90 * time_init_hook - do any specific initialisations for the system timer.
  91 *
  92 * Description:
  93 *      Must plug the system timer interrupt source at HZ into the IRQ listed
  94 *      in irq_vectors.h:TIMER_IRQ
  95 **/
  96void __init time_init_hook(void)
  97{
  98        irq0.mask = cpumask_of_cpu(0);
  99        setup_irq(0, &irq0);
 100}
 101
 102#ifdef CONFIG_MCA
 103/**
 104 * mca_nmi_hook - hook into MCA specific NMI chain
 105 *
 106 * Description:
 107 *      The MCA (Microchannel Arcitecture) has an NMI chain for NMI sources
 108 *      along the MCA bus.  Use this to hook into that chain if you will need
 109 *      it.
 110 **/
 111void mca_nmi_hook(void)
 112{
 113        /* If I recall correctly, there's a whole bunch of other things that
 114         * we can do to check for NMI problems, but that's all I know about
 115         * at the moment.
 116         */
 117
 118        printk("NMI generated from unknown source!\n");
 119}
 120#endif
 121
 122static __init int no_ipi_broadcast(char *str)
 123{
 124        get_option(&str, &no_broadcast);
 125        printk ("Using %s mode\n", no_broadcast ? "No IPI Broadcast" :
 126                                                                                        "IPI Broadcast");
 127        return 1;
 128}
 129
 130__setup("no_ipi_broadcast", no_ipi_broadcast);
 131
 132static int __init print_ipi_mode(void)
 133{
 134        printk ("Using IPI %s mode\n", no_broadcast ? "No-Shortcut" :
 135                                                                                        "Shortcut");
 136        return 0;
 137}
 138
 139late_initcall(print_ipi_mode);
 140
 141/**
 142 * machine_specific_memory_setup - Hook for machine specific memory setup.
 143 *
 144 * Description:
 145 *      This is included late in kernel/setup.c so that it can make
 146 *      use of all of the static functions.
 147 **/
 148
 149char * __init machine_specific_memory_setup(void)
 150{
 151        char *who;
 152
 153
 154        who = "BIOS-e820";
 155
 156        /*
 157         * Try to copy the BIOS-supplied E820-map.
 158         *
 159         * Otherwise fake a memory map; one section from 0k->640k,
 160         * the next section from 1mb->appropriate_mem_k
 161         */
 162        sanitize_e820_map(E820_MAP, &E820_MAP_NR);
 163        if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) {
 164                unsigned long mem_size;
 165
 166                /* compare results from other methods and take the greater */
 167                if (ALT_MEM_K < EXT_MEM_K) {
 168                        mem_size = EXT_MEM_K;
 169                        who = "BIOS-88";
 170                } else {
 171                        mem_size = ALT_MEM_K;
 172                        who = "BIOS-e801";
 173                }
 174
 175                e820.nr_map = 0;
 176                add_memory_region(0, LOWMEMSIZE(), E820_RAM);
 177                add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
 178        }
 179        return who;
 180}
 181