EAX= 80000000; read from bus0, device 0, funciton 0, register 0
ecx = 0x00000020h,表示要读取32 register,32 = 0010 0000b = 0x20h
ebx:buffer pointer
EAX= 80000000; read from bus0, device 0, funciton 0, register 0
ecx = 0x00000020h,表示要读取32 register,32 = 0010 0000b = 0x20h
ebx:buffer pointer