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| | What is interrupt? - A Word Definition From the Webopedia Computer Dictionary |
 | | Interrupt signals initiated by programs are called software interrupts. | | | The complete list of interrupts and associated interrupt handlers is stored in a table called the interrupt vector table, which resides in the first 1 K of addressable memory. | | | Each type of software interrupt is associated with an interrupt handler -- a routine that takes control when the interrupt occurs. |
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http://www.webopedia.com/TERM/I/interrupt.html
(415 words)
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| | interrupt - a Whatis.com definition |
| | An interrupt is a signal from a device attached to a computer or from a program within the computer that causes the main program that operates the computer (the operating system) to stop and figure out what to do next. | | | A hardware interrupt occurs, for example, when an I/O operation is completed such as reading some data into the computer from a tape drive. | | | After the interrupt signal is sensed, the computer either resumes running the program it was running or begins running another program. |
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http://whatis.techtarget.com/definition/0,,sid9_gci212374,00.html
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| | Encyclopedia article on Interrupt latency [EncycloZine] |
| | Therefore interrupt latency is determined by the software of a computer system. | | | Interrupt latency is the time that a computer system takes to begin running the interrupt code associated with a particular electronic event. | | | This reduces the absolute number of times that the OS can switch tasks per second (i.e., it lowers throughput), but decreases the OS's response time to service the electronics. |
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http://encyclozine.com/Interrupt_latency
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| | AARM95 - Interrupt Support |
| | Generation of an interrupt is the event in the underlying hardware or system that makes the interrupt available to the program. | | | For each interrupt, which interrupts are blocked from delivery when a handler attached to that interrupt executes (either as a result of an interrupt delivery or of an ordinary call on a procedure of the corresponding protected object). | | | Whether predefined or implementation-defined exceptions are raised as a result of the occurrence of any interrupt, and the mapping between the machine interrupts (or traps) and the predefined exceptions. |
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http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/aarm/AA-C-3.html
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| | AARM95 - Interrupt Entries |
| | An interrupt delivered to a task entry acts as a call to the entry issued by a hardware task whose priority is in the System.Interrupt_Priority range. | | | While an interrupt entry is attached to an interrupt, the interrupt is reserved (see C.3). | | | Otherwise, the interrupt entry is attached to the interrupt associated with the specified address. |
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http://www.iuma.ulpgc.es/users/jmiranda/gnat-rts/aarm/AA-J-7-1.html
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| | The Importance of Implementing APIC-Based Interrupt Subsystems on Uniprocessor PCs |
| | If the device is not interrupting, the ISR returns a value indicating that the interrupt was not caused by its device. | | | On PIC-based systems, sharing interrupts is the only way to allow all or even most of the devices in the system to function. | | | If the device is interrupting, the ISR queues any work to be done and causes the hardware to stop interrupting. |
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http://www.microsoft.com/whdc/system/sysperf/apic.mspx
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| | Interrupt Handlers |
| | The solution to this problem is for the interrupt handler to do what needs to be done immediately, usually read something from the hardware or send something to the hardware, and then schedule the handling of the new information at a later time (this is called the "bottom half") and return. | | | The second, called interrupts, is much harder to implement because it has to be dealt with when convenient for the hardware, not the CPU. | | | It's totally irrelevant, since * we don't have a way to restore the normal keyboard interrupt so the * computer is completely useless and has to be rebooted. |
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http://www.faqs.org/docs/kernel/x1206.html
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| | Direct Memory Access (DMA) and Interrupt Handling |
| | Many times software designers have to work with data structures that are shared with interrupts or DMA devices. | | | In such cases, the possible interrupting devices need to be polled in software. | | | Here we describe interrupt handling in a scenario where the hardware does not support identifying the device that initiated the interrupt. |
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http://www.eventhelix.com/RealtimeMantra/FaultHandling/dma_interrupt_handling.htm
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| | The Linux "real time interrupt patch" |
| | The linux interrupt processing routines are modified to be re-entrant in order to allow higher priority interrupts to occur while low priority interrupt processing is in progress. | | | The number of high priority interrupts per system should be reduced to a minimum and the user needs to make sure that the related interrupt service routines are determined. | | | Please note that using a low priority spinlock in a high priority interrupt handler, is forbidden since it doesn't prevent the high priority interrupts to occur while spin_lock_irqsave() locked data is being processed. |
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http://www.linuxdevices.com/articles/AT6105045931.html
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| | Interfacing The PC : Using Interrupts |
| | Most Ports/UARTs may interrupt the processor for a range of reasons, eg byte received, time-outs, FIFO buffer empty, overruns etc, thus the nature of the interrupt has to be determined. | | | The rest of the interrupt vectors are used for software interrupts and exception handlers. | | | Nothing, the interrupt request line found on the bus, was simply diverted into the IRQ 9 input. |
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http://www.beyondlogic.org/interrupts/interupt.htm
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| | Interrupt-Safe Routines |
| | Software interrupts are defined to run at task level, in the context of the task to which the software interrupt was sent. | | | Hardware interrupt level requires that all interrupts with lower interrupt priority be disabled for the duration of the hardware interrupt handler. | | | The longer you spend in your hardware interrupt handler, the longer the interrupt latency of the computer will be. |
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http://developer.apple.com/technotes/tn/tn1104.html
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| | Linux Device Drivers, 2nd Edition: Chapter 9: Interrupt Handling |
| | Edge-triggered interrupts, on the other hand, are not safe with regard to sharing; ISA is edge triggered, because this signaling is easier to implement at hardware level and therefore was the common choice in the 1980s. | | | The question of interrupt sharing under the ISA bus brings in the issue of level-triggered versus edge-triggered interrupt lines. | | | In order to support printer operation, the interrupt handler has been slightly modified from the one just shown, adding the ability to send the next data byte to the printer if there is more data to transfer. |
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http://www.xml.com/ldd/chapter/book/ch09.html
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| | Advanced Programmable Interrupt Controller |
| | An IRQ-type interrupt routine wishes to wake a sleeping thread, but this IRQ interrupt may be nested several levels inside other IRQ interrupts, so it cannot simply switch stacks as those outer interrupt routines would not complete until the old thread is re-woken. | | | I call this a 'software' interrupt because the operating system software initiated the interrupt. | | | Local interrupt 1 is for interrupts on the CPU's NMI pin. |
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http://osdev.berlios.de/pic.html
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| | Interrupt API |
| | This macro creates the prototype and opening of a function that is to be used as an interrupt. | | | In the AVR-GCC environment, the vector table is predefined to point to interrupt routines with predetermined names. |
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http://users.rcn.com/rneswold/avr/chinterrupt.html
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| | Ralf Brown's Interrupt List - HTML Version |
| | HTML version of the famous Ralf Brown Interrupt List with over 9000 linked pages and 350 indexes making the process of searching much easier. | | | He is well-known in cyberspace for maintaining the Interrupt List. | | | Interrupt - Access the Interrupt List by Interrupt Number |
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http://www.ctyme.com/rbrown.htm
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| | IRQs - Interrupt Requests |
| | When IBM came out with the XT computer with an 8080 processor and 8-bit expansion bus, it used one 8259, the top chip. | | | Later IBM came out with the 286 AT computer with an a 16-bit expansion bus and two 8259's as shown. | | | The IRQ structure in today's PC's goes all the way back to the Intel 8086 processor and the Intel 8259 Programmable Interrupt Controller (I remember working with this combination in 1979). |
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http://www.duxcw.com/faq/irq/irq.htm
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| | Thread (Java 2 Platform SE v1.4.2) |
| | then the thread's interrupt status will be set and it will return immediately from the selection operation, possibly with a non-zero value, just as if the selector's | | | method should be used to interrupt the wait. |
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http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Thread.html
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| | Interrupt Management |
| | This restriction is an artifact of the way interrupts are simulated under Nachos, and should not be taken as an indication of the way things are done on real machines. | | | All routines related to interrupt management are provided by the Interrupt object. | | | Change the interrupt mask to level, returning the previous value. |
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http://www.cs.duke.edu/~narten/110/nachos/main/node5.html
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| | Ralf Brown's Files |
| | The interrupt list is a comprehensive listing of interrupt calls, I/O ports, memory locations, far-call interfaces, and more for IBM PCs and compatible machines, both documented and undocumented. | | | A number of people have converted some or all of the interrupt list files into HTML format, for example Marc Perkel and DJ Delorie. | | | Some people have reported trouble retrieving files from the above; if so, try old-fashioned FTP to get the interrupt list. |
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http://www.cs.cmu.edu/afs/cs.cmu.edu/user/ralf/pub/WWW/files.html
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| | Intel® 82093AA I/O Advanced Programmable Interrupt Controller (I/O APIC) Datasheet |
| | Each interrupt pin is individually programmable as either edge or level triggered. | | | The interrupt vector and interrupt steering information can be specified per interrupt. | | | To increase system flexibility when assigning memory space usage, the I/O APIC's two-register memory space is re-locatable. |
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http://www.intel.com/design/chipsets/datashts/290566.htm
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| | Linux Kernel 2.4 Internals: Process and Interrupt Management |
| | if you race against interrupt handlers is because if you take it and then an interrupt comes in on the same CPU, it will busy wait for the lock forever: the lock holder, having been interrupted, will not continue until the interrupt handler returns. | | | Although Linux implementation of semaphores and read-write semaphores is very sophisticated, there are possible scenarios one can think of which are not yet implemented, for example there is no concept of interruptible read-write semaphores. | | | Since the early days of Linux support (early 90s, this century), developers were faced with the classical problem of accessing shared data between different types of context (user process vs interrupt) and different instances of the same context from multiple cpus. |
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http://www.moses.uklinux.net/patches/lki-2.html
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| | Interrupt Services DOS, BIOS, EMS und Mouse |
| | INT 2F,2 - Multiplex Interrupt - Cancel file | | | IBM PC Hardware Interrupt Table (in order of priority) | | | INT 2F,3 - Multiplex Interrupt - Cancel all files |
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http://www.htl-steyr.ac.at/~morg/pcinfo/hardware/interrupts/inte1at0.htm
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| | We interrupt this fantasy... - Games - MSNBC.com |
| | But those same qualities lend themselves to a discouraging experience should advertisements interrupt the flow of the game. | | | Representatives at publishers like Electronic Arts and Activision say there is no need to worry. |
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http://www.msnbc.msn.com/id/5722377
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| | We Interrupt This Empire... |
| | "We Interrupt This Empire..." is a collaborative work by many of the Bay Area's independent video activists which documents the direct actions that shut down the financial district of San Francisco in the weeks following the United States' invasion of Iraq. | | | The San Francisco Video Activist Network presents the story you won't see on Fox News: an unflinching look at the Bay Area's radical resistance to an illegal and horrific war. |
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http://www.videoactivism.org/empire.html
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| | Convention Oratory, Increasingly Shoved Aside (washingtonpost.com) |
| | On Wednesday, he took Al Sharpton for two minutes of a 20-minute speech, interjecting: "That's our pal Sharpton, doing what Al does. | | | If it had been my hour, I'd have done it. | | | On Tuesday, O'Reilly interrupted an interview with Jerry Brown to listen to about four minutes of Ted Kennedy's 25-minute address. |
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http://www.washingtonpost.com/wp-dyn/articles/A32979-2004Aug1.html
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