arch/x86/kernel/apic/apic-xen.c

   1 /*
   2  *      Local APIC handling stubs
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/module.h>
   8
   9 #include <asm/smp.h>
  10 #include <asm/proto.h>
  11 #include <asm/apic.h>
  12
  13 unsigned int num_processors;
  14
  15 /*
  16  * Map cpu index to physical APIC ID
  17  */
  18 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
  19 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
  20
  21 /*
  22  * Debug level, exported for io_apic.c
  23  */
  24 unsigned int apic_verbosity;
  25
  26 /* Have we found an MP table */
  27 int smp_found_config;
  28
  29 static int __init apic_set_verbosity(char *arg)
  30 {
  31         if (!arg)  {
  32 #ifdef CONFIG_X86_64
  33                 skip_ioapic_setup = 0;
  34                 return 0;
  35 #endif
  36                 return -EINVAL;
  37         }
  38
  39         if (strcmp("debug", arg) == 0)
  40                 apic_verbosity = APIC_DEBUG;
  41         else if (strcmp("verbose", arg) == 0)
  42                 apic_verbosity = APIC_VERBOSE;
  43         else {
  44                 pr_warning("APIC Verbosity level %s not recognised"
  45                         " use apic=verbose or apic=debug\n", arg);
  46                 return -EINVAL;
  47         }
  48
  49         return 0;
  50 }
  51 early_param("apic", apic_set_verbosity);
  52
  53 int setup_profiling_timer(unsigned int multiplier)
  54 {
  55         return -EINVAL;
  56 }
  57
  58 int __init APIC_init_uniprocessor(void)
  59 {
  60 #ifdef CONFIG_X86_IO_APIC
  61         if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
  62                 setup_IO_APIC();
  63 # ifdef CONFIG_X86_64
  64         else
  65                 nr_ioapics = 0;
  66 # endif
  67 #endif
  68
  69         return 0;
  70 }