Reading: I/O Devices. Read OSTEP chapter 36 (http://pages.cs.wisc.edu/~remzi/OST

Question

Reading: I/O Devices. Read OSTEP chapter 36 (http://pages.cs.wisc.edu/~remzi/OSTEP/file-devices.pdf) and answer the following questions:

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1. In Figure 36.5 ("The xv6 IDE Disk Driver (Simplified)" figure on Page 10) , in function ide_start_request(), what kind of register is written to on the line with comment '// this is a WRITE' ? a) a command register b) a data register c) a status register.

2. In the IDE example of SECTION 36.8, how many bytes are used to identify a location on disk where a read or write will be performed?

Explanation / Answer

1)

C) a status register

2)

4 bytes of information is used to identify a location on disk where read or write will be performed

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