老版的 Linux 的 bootsector.S 有这么一段
老版的 Linux 的 bootsector.S 有这么一段load_setup:
xorb %ah, %ah # reset FDC
xorb %dl, %dl
int $0x13
xorw %dx, %dx # drive 0, head 0
movb $0x02, %cl # sector 2, track 0
movw $0x0200, %bx # address = 512, in INITSEG
movb $0x02, %ah # service 2, "read sector(s)"
movb setup_sects, %al # (assume all on head 0, track 0)
int $0x13 # read it
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