aarch64_boot
入口
## arch/arm64/kernel/vmlinux.lds.S
ENTRY(_text)
.head.text : {
_text = .;
HEAD_TEXT
}
## include/asm-generic/vmlinux.lds.h
#define HEAD_TEXT KEEP(*(.head.text))
## include/linux/init.h
#define __HEAD .section ".head.text","ax"
## arch/arm64/kernel/head.S
__HEAD__create_page_tables函数
__enable_mmu函数
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