TRAMPOLINE_PHYS_LOW 23 arch/x86/include/asm/smpboot_hooks.h *((volatile unsigned short *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = TRAMPOLINE_PHYS_LOW 45 arch/x86/include/asm/smpboot_hooks.h *((volatile u32 *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = 0;