函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:arch\x86\kernel\reboot.c Create Date:2022-07-27 09:18:29
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void native_machine_shutdown(void)
{
    /* Stop the cpus and apics */
#ifdef CONFIG_X86_IO_APIC
    /*
     * Disabling IO APIC before local APIC is a workaround for
     * erratum AVR31 in "Intel Atom Processor C2000 Product Family
     * Specification Update". In this situation, interrupts that target
     * a Logical Processor whose Local APIC is either in the process of
     * being hardware disabled or software disabled are neither delivered
     * nor discarded. When this erratum occurs, the processor may hang.
     *
     * Even without the erratum, it still makes sense to quiet IO APIC
     * before disabling Local APIC.
     */
    clear_IO_APIC();
#endif
 
#ifdef CONFIG_SMP
    /*
     * Stop all of the others. Also disable the local irq to
     * not receive the per-cpu timer interrupt which may trigger
     * scheduler's load balance.
     */
    local_irq_disable();
    stop_other_cpus();
#endif
 
    lapic_shutdown();
    restore_boot_irq_mode();
 
#ifdef CONFIG_HPET_TIMER
    hpet_disable();
#endif
 
#ifdef CONFIG_X86_64
    x86_platform.iommu_shutdown();
#endif
}