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         CMOS_WRITE(0xa, 0xf);
  14         local_flush_tlb();
  15         pr_debug("1.\n");
  16         *((volatile unsigned short *)phys_to_virt(apic->trampoline_phys_high)) =
  17                                                                  start_eip >> 4;
  18         pr_debug("2.\n");
  19         *((volatile unsigned short *)phys_to_virt(apic->trampoline_phys_low)) =
  20                                                          start_eip & 0xf;
  21         pr_debug("3.\n");
  22 }
  23
  24 static inline void smpboot_restore_warm_reset_vector(void)
  25 {
  26         /*
  27          * Install writable page 0 entry to set BIOS data area.
  28          */
  29         local_flush_tlb();
  30
  31         /*
  32          * Paranoid:  Set warm reset code and vector here back
  33          * to default values.
  34          */
  35         CMOS_WRITE(0, 0xf);
  36
  37         *((volatile u32 *)phys_to_virt(apic->trampoline_phys_low)) = 0;
  38 }
  39
  40 static inline void __init smpboot_setup_io_apic(void)
  41 {
  42 #ifdef CONFIG_X86_IO_APIC
  43         /*
  44          * Here we can be sure that there is an IO-APIC in the system. Let's
  45          * go and set it up:
  46          */
  47         if (!skip_ioapic_setup && nr_ioapics)
  48                 setup_IO_APIC();
  49         else {
  50                 nr_ioapics = 0;
  51         }
  52 #endif
  53 }
  54
  55 static inline void smpboot_clear_io_apic(void)
  56 {
  57 #ifdef CONFIG_X86_IO_APIC
  58         nr_ioapics = 0;
  59 #endif
  60 }