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Okay, let's look at a sample problem.
好 让我们看一个样本问题
Suppose we're given a computer with a 16bit virtual address
假设我们有一台计算机 16位虚拟地址系统
and a page size of 256 bytes.
页面大小为256字节
The system uses onelevel page tables that start at address hex 400.
系统采用单层页面表 起始地址为0x400
Maybe you want DMA on your 16bit system. Who knows?
也许这个系统有直接存储器存取功能 随便啦
The first few pages are reserved for hardware flags, etc.
前几页用于硬盘标记储存 等等
Assume pagetable entries have eight status bits.
假设一个页面表共有八个状态位
The eight status bits would then be...
这八个状态位将会被...
Anybody?
有人知道吗?
And I see we have our first surrender.
我看到了第一个逃兵
Don't worry, Mr. Zuckerberg.
别担心 Zuckerberg先生
Brighter men than you have tried and failed this class.
比你聪明的人也在这门课上挂了
One valid bit, one modified bit, one reference bit and five permission bits.
一个有效位 一个修改位 一个参考位 五个许可位
That is correct.
他答对了
Does everybody see how he got there?
谁知道他怎么算的吗?
Mark?
Mark?
You Mark Zuckerberg? Yeah.
你是Mark Zuckerberg吗? 是啊
Cameron Winklevoss. Hi.
我是Cameron Winklevoss 嗨...
Tyler Winklevoss.
我是Tyler Winklevoss
Are you guys related?
你们两个有亲戚关系吗?
That's good. Funny.
问的好 有趣
We never heard that before.
没有人这样问过我们
So, what can I do for you? Did I insult your girlfriends?
我要为你们做什么? 我侮辱你们的女友了吗?
No. You didn't. Actually, I don't know.
不 没有 说实话...我不知道
Yeah, we never asked. We should do that.
我们从来没问过 也许我们该问问呢...
No.
没有啦
We have an idea we want to talk to you about.
我们想找你谈点事
You got a minute?
有空吗?
You guys look like you spend some time at the gym.
你们貌似花了大功夫健身啊
We have to. Why?
我们不得不这么做 为什么?
We row crew.
我们要划赛艇
Yeah, I've got a minute. Great.
好 我有空 太好了
