Type 0: End Point
Type 1: Virtual Devices
Legacy PCI: 每个Funciton包括256 Byte空间
PCI3e: 每个Funciton包括4K Byte空间
首先需要写3:2:5:40(Bus number = 3; Device number = 2; Function number = 5,Register = 40 )到0xCF8
从0xCFC读取数据
寄存器256 Byte = 2^8 B,对应bit 0 ~ bit 7
Device + Function,对应下一个Byte:32x Device + 8x Function,对应bit 8 ~ bit15
Bus Number(256),对应下一个Byte: bit16 ~ bit23
余下的8bit,bit31置1,bit30 ~ bit24 置0
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对于3:2:5:40, Register = 40
Device Number = 2 = 010b
Function = 5 = 101b
Device + Function = 00010101 高位补0 = 15
Bust Number = 3 = 02
高位 bit31 ~ bit24 = 80
因此,整个配置空间 = 80031540
从0xCFC读数据
MOV DX