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
  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 = { 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  **/
  49 void __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  **/
  67 void __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  **/
  78 void __init trap_init_hook(void)
  79 {
  80 }
  81
  82 static struct irqaction irq0  = {
  83         .handler = timer_interrupt,
  84         .flags = IRQF_DISABLED | IRQF_NOBALANCING,
  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  **/
  96 void __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  **/
 111 void 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
 122 static __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
 132 static 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
 139 late_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
 149 char * __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 }