smpboot_hooks.h

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/* two abstractions specific to kernel/smpboot.c, mainly to cater to visws
 * which needs to alter them. */

static inline void smpboot_clear_io_apic_irqs(void)
{
#ifdef CONFIG_X86_IO_APIC
    io_apic_irqs = 0;
#endif
}

static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
{
    unsigned long flags;

    spin_lock_irqsave(&rtc_lock, flags);
    CMOS_WRITE(0xa, 0xf);
    spin_unlock_irqrestore(&rtc_lock, flags);
    local_flush_tlb();
    pr_debug("1.\n");
    *((volatile unsigned short *)phys_to_virt(apic->trampoline_phys_high)) =
                                 start_eip >> 4;
    pr_debug("2.\n");
    *((volatile unsigned short *)phys_to_virt(apic->trampoline_phys_low)) =
                             start_eip & 0xf;
    pr_debug("3.\n");
}

static inline void smpboot_restore_warm_reset_vector(void)
{
    unsigned long flags;

    /*
     * Install writable page 0 entry to set BIOS data area.
     */
    local_flush_tlb();

    /*
     * Paranoid:  Set warm reset code and vector here back
     * to default values.
     */
    spin_lock_irqsave(&rtc_lock, flags);
    CMOS_WRITE(0, 0xf);
    spin_unlock_irqrestore(&rtc_lock, flags);

    *((volatile u32 *)phys_to_virt(apic->trampoline_phys_low)) = 0;
}

static inline void __init smpboot_setup_io_apic(void)
{
#ifdef CONFIG_X86_IO_APIC
    /*
     * Here we can be sure that there is an IO-APIC in the system. Let's
     * go and set it up:
     */
    if (!skip_ioapic_setup && nr_ioapics)
        setup_IO_APIC();
    else {
        nr_ioapics = 0;
    }
#endif
}

static inline void smpboot_clear_io_apic(void)
{
#ifdef CONFIG_X86_IO_APIC
    nr_ioapics = 0;
#endif
}