ref: 7fa5db9d6a8d3b7d1430cab7df9fda9b8ee1ec0b dir: /sys/src/9/arm64/init9.s/
TEXT main(SB), 1, $8 MOV $setSB(SB), R28 /* load the SB */ MOV $boot(SB), R0 B startboot(SB)