问题描述
因此，正如问题所指出的，英特尔8086中CS和IP寄存器的用途是什么
So, as the question states, what is the purpose of CS and IP registers in intel's 8086
我找到了这个解释:
这是针对IP的:
我不太了解这的基本含义，因此，如果有人可以提供更生动"的解释，那将是很好的:)
I don't really understand what this basically means, so if someone could provide a more "vivid" explanation, that would be great :)
推荐答案
由于指令指针(IP)为16位，这意味着您只能有64k条指令(2 ^ 16)，即使在80年代也没有多少. .因此，为了扩展地址空间，您需要使用第二个寄存器来寻址64k块.您可以将cs:ip视为一个32位寄存器，然后可以寻址2 ^ 32字节...即4G，这是在使用32位地址的处理器上获得的. 8086使用的是20位地址，因此您可以访问1M的内存.
Since the Instruction Pointer (IP) is 16 bit it means you can only have 64k instructions (2^16), which wasn't much even in the 80s. So to expand the address space you have a second register which addresses 64k blocks. You could consider cs:ip together as one 32 bit register which is then capable of addressing 2^32 bytes...ie 4G which is what you get on a processor which uses 32 bit addresses. The 8086 was using 20 bits of addresses, so you could access 1M of memory.
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