RESERVED_TTBR0_SIZE 18 arch/arm64/include/asm/asm-uaccess.h sub \tmp1, \tmp1, #RESERVED_TTBR0_SIZE // reserved_ttbr0 just before swapper_pg_dir RESERVED_TTBR0_SIZE 21 arch/arm64/include/asm/asm-uaccess.h add \tmp1, \tmp1, #RESERVED_TTBR0_SIZE RESERVED_TTBR0_SIZE 116 arch/arm64/include/asm/uaccess.h write_sysreg(ttbr - RESERVED_TTBR0_SIZE, ttbr0_el1);