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DATE 2015-01-01

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Key: id Value: 542871

Key: archive_learn Value: 2015-01-01

MESSAGE
DATE 2015-01-29
FROM Ruben Safir
SUBJECT Re: [LIU Comp Sci] Operating System Interupts
From owner-learn-outgoing-at-mrbrklyn.com Thu Jan 29 22:11:15 2015
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From: Ruben Safir
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To: learn-at-nylxs.com, Samir Iabbassen
Subject: Re: [LIU Comp Sci] Operating System Interupts
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This is the last one and these are in usenet at
comp.os.linux.hardware

Your all welcome to jump in and ask a question on usenet or pose an
answer or a correction.

By all means, let us not all sit on our asses like we are students (yes
that is cynicism and a complaint)

There are lots of resources out there to get involved and to learn.
Learning is what we are supposed to be doing...

Learning requires conversation, integration and discussion of knowledge...

sigh

Joe Pfeiffer writes:

> ruben safir writes:
>
>> I'm wondering if anyone has a background in operating system design.
>> I'm taking a class is OS's and the text is
>>
>> OPERATING
>> SYSTEM
>> CONCEPTS
>> ABRAHAM SILBERSCHATZ
>> 9th edition, and it says something that is puzzling me
>>
>>
>>
>> "Interrupts are an important part of a computer architecture. Each
>> computer design has its own interrupt mechanism, but several functions
>> are common. The interrupt must transfer control to the appropriate
>> interrupt service routine. The straightforward method for handling this
>> transfer would be to invoke a generic routine to examine the interrupt
>> information. The routine, in turn, would call the interrupt-specific
>> handler. However, interrupts must be handled quickly"
>>
>> " Since only a predefined number of interrupts is possible, a table of
>> pointers to interrupt routines can be used instead*** to provide the
>> necessary speed. The interrupt routine is called indirectly through the
>> table, with no intermediate routine needed. Generally, the table of
>> pointers is stored in low memory (the first hundred or so locations).
>> These locations hold the addresses of the interrupt service routines for
>> the various devices. This array, or interrupt vector, of addresses is
>> then indexed by a unique device number, given with the interrupt
>> request, to provide the address of the interrupt service routine for
>> the interrupting device. Operating systems as different as Windows and
>> UNIX dispatch interrupts in this manner."
>>
>>
>> *** Instead of what? Just because you have a table of pointers to
>> routines doesn't change the need for a routine, a generic routine
>> perhaps, from accessing that table.
>
> In an interrupt vector table like he's describing, the hardware indexes
> the table directly and jumps straight to the ISR without any software
> intervention before it gets there.

After reading some of the other responses, I'll give a concrete example
(which sounds like the machine he has in mind): the interrupt mechanism
on the old DEC PDP-11.

On the PDP-11, a device requested an interrupt by asserting a bus
request line. The CPU would respond by asserting a corresponding bus
grant line (there was a mechanism for resolving multiple simultaneous
interrupt requests, which is not relevant here).

After receiving the bus grant, the device would place a memory address
on the bus address lines. This was the address of the device's
"interrupt vector".

The CPU would retrieve a new program counter (PC) and processor status
word (PSW) from the four bytes at this address, push the old PC and PSW
on the stack, and begin execution at the new PC.

  1. 2015-01-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] databse normalzation resources
  2. 2015-01-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Future of Computer Education
  3. 2015-01-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Future of Computer Education
  4. 2015-01-21 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] pinging new semester...
  5. 2015-01-21 duodujames <duodujames-at-gmail.com> RE: [LIU Comp Sci] pinging new semester...
  6. 2015-01-21 Maneesh Kongara <maneeshkongara-at-gmail.com> RE: [LIU Comp Sci] pinging new semester...
  7. 2015-01-21 duodujames <duodujames-at-gmail.com> RE: [LIU Comp Sci] pinging new semester...
  8. 2015-01-21 Maneesh Kongara <maneeshkongara-at-gmail.com> RE: [LIU Comp Sci] pinging new semester...
  9. 2015-01-21 duodujames <duodujames-at-gmail.com> RE: [LIU Comp Sci] pinging new semester...
  10. 2015-01-21 Maneesh Kongara <maneeshkongara-at-gmail.com> RE: [LIU Comp Sci] pinging new semester...
  11. 2015-01-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] pinging new semester...
  12. 2015-01-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] pinging new semester...
  13. 2015-01-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] pinging new semester...
  14. 2015-01-21 duodujames <duodujames-at-gmail.com> Re: [LIU Comp Sci] pinging new semester...
  15. 2015-01-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Class Virtual Machine
  16. 2015-01-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] pinging new semester...
  17. 2015-01-22 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  18. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  19. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  20. 2015-01-22 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  21. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  22. 2015-01-22 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  23. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  24. 2015-01-22 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  25. 2015-01-22 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Normalization review
  26. 2015-01-22 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  27. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  28. 2015-01-22 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  29. 2015-01-22 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  30. 2015-01-22 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  31. 2015-01-22 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  32. 2015-01-22 Sergei Glikstein <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  33. 2015-01-22 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  34. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] study hall today
  35. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Algorithms Assignment 1 attempt
  36. 2015-01-22 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Algoritms
  37. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  38. 2015-01-23 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  39. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  40. 2015-01-23 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  41. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Algorithms Assignment 1 attempt
  42. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  43. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  44. 2015-01-23 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  45. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  46. 2015-01-23 From: "Serge Glikstein" <serge.gl-at-gmail.com> Re: [LIU Comp Sci] Normalization review
  47. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Normalization review
  48. 2015-01-23 Kamran <kamran.mirzayev-at-my.liu.edu> Re: [LIU Comp Sci] study hall today
  49. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Linux Job Crunch
  50. 2015-01-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Software compexity and history - must see video
  51. 2015-01-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Weather Emergency!!
  52. 2015-01-28 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] making the class up on the fly
  53. 2015-01-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] making the class up on the fly
  54. 2015-01-28 Tony Genao <tony.genao-at-my.liu.edu> Re: [LIU Comp Sci] making the class up on the fly
  55. 2015-01-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] making the class up on the fly
  56. 2015-01-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] making the class up on the fly
  57. 2015-01-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] making the class up on the fly
  58. 2015-01-28 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] NYLUG Open hacker hours
  59. 2015-01-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Operating Systems gibberish
  60. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] making the class up on the fly
  61. 2015-01-29 muhammad rizwan khalid <rizwankhalid316-at-gmail.com> Re: [LIU Comp Sci] making the class up on the fly
  62. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] making the class up on the fly
  63. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System Interupts
  64. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System Interupts
  65. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System Interupts
  66. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System Interupts
  67. 2015-01-29 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Operating System Interupts
  68. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] LIU mailing list FAQ
  69. 2015-01-29 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] nixCraft Linux / UNIX Newsletter
  70. 2015-01-29 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Operating System Interupts
  71. 2015-01-30 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System Interupts
  72. 2015-01-31 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Linked List Homework
  73. 2015-01-31 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Linked List Homework
  74. 2015-01-31 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Linked List Homework
  75. 2015-01-31 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] linkedlist example

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