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
   8 #include <asm/smp.h>
   9 #include <asm/proto.h>
  10 #include <asm/apic.h>
  11
  12 unsigned int num_processors;
  13
  14 /*
  15  * Debug level, exported for io_apic.c
  16  */
  17 unsigned int apic_verbosity;
  18
  19 /* Have we found an MP table */
  20 int smp_found_config;
  21
  22 static int __init apic_set_verbosity(char *arg)
  23 {
  24         if (!arg)  {
  25 #ifdef CONFIG_X86_64
  26                 skip_ioapic_setup = 0;
  27                 return 0;
  28 #endif
  29                 return -EINVAL;
  30         }
  31
  32         if (strcmp("debug", arg) == 0)
  33                 apic_verbosity = APIC_DEBUG;
  34         else if (strcmp("verbose", arg) == 0)
  35                 apic_verbosity = APIC_VERBOSE;
  36         else {
  37                 pr_warning("APIC Verbosity level %s not recognised"
  38                         " use apic=verbose or apic=debug\n", arg);
  39                 return -EINVAL;
  40         }
  41
  42         return 0;
  43 }
  44 early_param("apic", apic_set_verbosity);
  45
  46 int setup_profiling_timer(unsigned int multiplier)
  47 {
  48         return -EINVAL;
  49 }
  50
  51 #ifndef CONFIG_SMP
  52 /*
  53  * This initializes the IO-APIC and APIC hardware if this is
  54  * a UP kernel.
  55  */
  56 int __init APIC_init_uniprocessor(void)
  57 {
  58 #ifdef CONFIG_X86_IO_APIC
  59         if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
  60                 setup_IO_APIC();
  61 # ifdef CONFIG_X86_64
  62         else
  63                 nr_ioapics = 0;
  64 # endif
  65 #endif
  66
  67         return 0;
  68 }
  69 #endif