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// arch/arm64/kernel/head.S
#define __PHYS_OFFSET   (KERNEL_START - TEXT_OFFSET)

// arch/arm64/include/asm/memory.h
#define KERNEL_START      _text

// arch/arm64/kernel/vmlinux.lds.S
    . = KIMAGE_VADDR + TEXT_OFFSET;

    .head.text : {
        _text = .;
        HEAD_TEXT
    }

因此：
__PHYS_OFFSET = (KERNEL_START - TEXT_OFFSET)
              = (_text - TEXT_OFFSET)
              = (KIMAGE_VADDR + TEXT_OFFSET - TEXT_OFFSET)
              = KIMAGE_VADDR