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NCTU OS 2015

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HW3: Virtual Memory Experiment

This is Homework 3 for Introduction to Operating Systems, Fall 2015. This homework assignment will familiarize you with the concept of virtual memory through a series of experiments on the Linux memory subsystem.

Please read the tutorials and then carry the prescribed experiment steps. You will have to submit a report for the homework. The detail spec is in spec.rst.

Contact Us

If you have any question about this homework, feel free to e-mail the TA, or knock the door of EC618.

Don't forget to attach your name and student ID in the e-mail, and name the subject as [OS] HW3 Question (<STUDENT ID>).

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nctu_os_2015_hw3's Issues

Section1/sorting_numbers.c won't wait

In line 52 of Section1/sorting_numbers.c
I think the getchar() is meant to stop the program from exiting immediately,
but it will eat the "\n" of the user entering the numbers to sort.
adding another getchar() will solve the issue.

physical address should be masked by processor's physical address width instead of using pte_val() directly

physical address should be mask by processor's physical address width instead of using pte_val() directly (e.g. paddr &= phyaddr_mask)
(ref: Intel Dev 3A ch4.5 IA-32E PAGING:
Table 4-12. Use of CR3 with IA-32e Paging and CR4.PCIDE = 0)

Currently, the HW/Question is supposed that physical address bits is same as virtual address bits, 48 bits. We can discuss whether it is proper in the future.
Below is the correct data in x86_64:
MAXPHYADDR = 52 bits
Get physical address width of this x86_64 processor from cpuid instruction: cpuid(eax = 0x80000008)[7:0] (ref: Intel Dev 3A ch4.1.4)

For more infomation,

  1. for how to use cpuid in kernel, give a reference:
  2. Intel Dev 3A => Intel x86_64 Dev Manual Volume 3A: http://www.intel.com/Assets/en_US/PDF/manual/253668.pdf
  3. how to get cpuid value from your linux pc

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