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Execute in place information


In computer science, execute in place (XIP) is a method of executing programs directly from long-term storage rather than copying it into RAM. It is an extension of using shared memory to reduce the total amount of memory required.

Its general effect is that the program text consumes no writable memory, saving it for dynamic data, and that all instances of the program are run from a single copy.

For this to work, several criteria have to be met:

  • The storage must provide a similar interface to the CPU as regular memory (or an adaptive layer must be present).
  • This interface must provide sufficiently fast read operations with a random access pattern.
  • The file system, if one is used, needs to expose appropriate mapping functions.
  • The program must either be linked to be aware of the address the storage appears at in the system or be position-independent.
  • The program must not modify data within the loaded image.

The storage requirements are usually met by using NOR flash memory or EEPROM, which can be addressed as individual words for read operations, although it is a bit slower than normal system RAM in most setups.

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Execute in place

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In computer science, execute in place (XIP) is a method of executing programs directly from long-term storage rather than copying it into RAM. It is an...

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Flash memory

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Execute-in-place applications, on the other hand, require every bit in a word to be accessed simultaneously. This requires word-level addressing. In any...

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Shared memory

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with explicit support of the program in question. This is most often used for shared libraries and for Execute in place (XIP). Since both processes can access...

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Mobile phone

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flash memory, from which processor instructions could be executed directly in an execute in place architecture and allowed for short boot times. With smartphones...

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Linear Flash

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CompactFlash and Memory Stick. Like an SRAM, Linear Flash supports execute in place (XIP) applications in mobile PC and embedded equipment. Linear Flash can also...

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BlackBerry 950

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would be linked with the rest of the code on the device allowing them execute in place from the flash memory. The operating system was aware of the layout...

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developed at Intel, and now maintained at Numonyx. It was designed to use execute in place (XIP) alongside compression aiming to reduce boot and program load...

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Psion Organiser

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being that it could interpret – that is, read and execute – Forth intermediate code directly in place on a Datapak, rather than needing to copy it into...

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computer program is a sequence or set of instructions in a programming language for a computer to execute. It is one component of software, which also includes...

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* * * <command to execute> The syntax of each line expects a cron expression made of five fields which represent the time to execute the command, followed...

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hangman in the 20th century in England. The last hangings in Britain took place in 1964, when Peter Anthony Allen was executed at Walton Prison in Liverpool...

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in C: #include <stdio.h> #include <stdlib.h> #include <time.h> // executes in-place bogo sort on a given array static void bogo_sort(int* a, int size);...

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Capital punishment for juveniles in the United States

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crime to be executed, although due to lengthy appeals processes, none of them were still juveniles by the time of their executions. Since 1642, in the Thirteen...

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specific task allowing access to only those resources required to execute. By placing all vulnerable tasks inside micro-VMs that are tied to the hardware...

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Executable UML (xtUML or xUML) is both a software development method and a highly abstract software language. It was described for the first time in 2002...

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Public execution

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for those related to the person being executed, victims' families, and sometimes reporters. Frances Larson wrote in her 2014 book Severed: A History of...

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