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Implementing Protection with Virtual Memory - computer architecture:
To enable the operating system to implement protection in the VM system, the HW have to:
I. Support at least 2 modes that denoted whether the running process is a user process (executive process) or an operating system process (kernel/supervisor process).
II. Provide a part ion of the CPU state that a user process may read but not write (includes supervisor mode bit).
o Only operating system process may change page tables. Page tables are held in operating system address space thereby preventing a user procedure from changing them.
o When processes desire to share information in a restricted way, the OS have to assist them.
o The write access bit (in both the TLB and the page table) can be used to limit the sharing to only read sharing.
RAW and WAW - Data hazards: RAW (read after write) - j tries to read a source before i writes it, hence j wrongly gets the old value .This is the most usual type of
The following is taken from the first edition of the Set Book. We have included this because we find these characteristics helpful. We will refer to them later. In addition to t
Problem: a) Authoring tools consist of two basic features. First, an authoring facility for creating and editing, and second, a presentation vehicle for delivery. The authorin
Which TTL logic gate is used for wired ANDing ? Ans. Open collector output, TTL logic gate is used.
zmax=7.5x1-3x2 subject to constraints 3x1-x2-x3>=3 x1-x2+x3>=2 x1,x2,x3>=0
The first part of the address in electronic mailbox identifies? The first part of address in E-Mail identifies the user's mail box.
Standard Query Operators in LINQ can be used for working with collections for any of the following and more. 1. Get total count of elements in a collection. 2. Order the resu
Q. Describe about Modem Language? Modems understand a set of instructions known as Hayes Command Set or AT Command Set. These commands are used to communicate with Modem. At ti
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Chains of Inference: Now we have to look at how to get an agent to prove a given theorem using various search strategies? Thus we have noted in previous lectures that, there i
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