arch/x86/include/asm/smpboot_hooks.h

   1 /* two abstractions specific to kernel/smpboot.c, mainly to cater to visws
   2  * which needs to alter them. */
   3
   4 static inline void smpboot_clear_io_apic_irqs(void)
   5 {
   6 #ifdef CONFIG_X86_IO_APIC
   7         io_apic_irqs = 0;
   8 #endif
   9 }
  10
  11 static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
  12 {
  13         unsigned long flags;
  14
  15         spin_lock_irqsave(&rtc_lock, flags);
  16         CMOS_WRITE(0xa, 0xf);
  17         spin_unlock_irqrestore(&rtc_lock, flags);
  18         local_flush_tlb();
  19         pr_debug("1.\n");
  20         *((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_HIGH)) =
  21                                                         start_eip >> 4;
  22         pr_debug("2.\n");
  23         *((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) =
  24                                                         start_eip & 0xf;
  25         pr_debug("3.\n");
  26 }
  27
  28 static inline void smpboot_restore_warm_reset_vector(void)
  29 {
  30         unsigned long flags;
  31
  32         /*
  33          * Install writable page 0 entry to set BIOS data area.
  34          */
  35         local_flush_tlb();
  36
  37         /*
  38          * Paranoid:  Set warm reset code and vector here back
  39          * to default values.
  40          */
  41         spin_lock_irqsave(&rtc_lock, flags);
  42         CMOS_WRITE(0, 0xf);
  43         spin_unlock_irqrestore(&rtc_lock, flags);
  44
  45         *((volatile u32 *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = 0;
  46 }
  47
  48 static inline void __init smpboot_setup_io_apic(void)
  49 {
  50 #ifdef CONFIG_X86_IO_APIC
  51         /*
  52          * Here we can be sure that there is an IO-APIC in the system. Let's
  53          * go and set it up:
  54          */
  55         if (!skip_ioapic_setup && nr_ioapics)
  56                 setup_IO_APIC();
  57         else {
  58                 nr_ioapics = 0;
  59         }
  60 #endif
  61 }
  62
  63 static inline void smpboot_clear_io_apic(void)
  64 {
  65 #ifdef CONFIG_X86_IO_APIC
  66         nr_ioapics = 0;
  67 #endif
  68 }