mirror of https://gitee.com/openkylin/linux.git
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
/* two abstractions specific to kernel/smpboot.c, mainly to cater to visws
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* which needs to alter them. */
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static inline void smpboot_clear_io_apic_irqs(void)
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{
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#ifdef CONFIG_X86_IO_APIC
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io_apic_irqs = 0;
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#endif
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}
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static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
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{
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CMOS_WRITE(0xa, 0xf);
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local_flush_tlb();
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pr_debug("1.\n");
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*((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_HIGH)) =
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start_eip >> 4;
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pr_debug("2.\n");
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*((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) =
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start_eip & 0xf;
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pr_debug("3.\n");
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}
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static inline void smpboot_restore_warm_reset_vector(void)
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{
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/*
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* Install writable page 0 entry to set BIOS data area.
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*/
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local_flush_tlb();
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/*
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* Paranoid: Set warm reset code and vector here back
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* to default values.
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*/
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CMOS_WRITE(0, 0xf);
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*((volatile long *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = 0;
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}
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static inline void __init smpboot_setup_io_apic(void)
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{
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#ifdef CONFIG_X86_IO_APIC
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/*
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* Here we can be sure that there is an IO-APIC in the system. Let's
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* go and set it up:
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*/
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if (!skip_ioapic_setup && nr_ioapics)
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setup_IO_APIC();
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else {
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nr_ioapics = 0;
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localise_nmi_watchdog();
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}
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#endif
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}
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static inline void smpboot_clear_io_apic(void)
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{
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#ifdef CONFIG_X86_IO_APIC
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nr_ioapics = 0;
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#endif
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}
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