REX OS

      This article is about the Real-Time Executive (REX) operating system. For other uses, see REX OS (disambiguation).
      REX Operating System
      Company / developer Qualcomm
      OS family Embedded operating system
      Initial release 1999 [1]
      Marketing target Smartphones
      Available programming languages(s) C [1]
      Supported platforms ARM
      Kernel type Microkernel based on L4A Pistachio and Iguana
      License Proprietary

      The REX Operating System (Real-Time Executive Operating System) is an RTOS developed by Qualcomm for the ARM-based mobile phone Dual-Mode Subscriber Station (DMSS) or Advanced Mode Subscriber Software (AMSS) development. As of 2007 most Korean cell phones run on REX.[2]

      REX is an L4A Pistachio embedded micro-kernel and Iguana operating system combination and has extensive Qualcomm and HTC modifications and extensions.[3]

      Originally developed for the Intel 80186 it was then ported to ARM and x86 architectures are no longer supported. REX is not POSIX compliant or open source and requires a license from Qualcomm for use.[4]

      It does not seem to be actively developed or marketed as of 2012 but is used in currently or recently sold low end cell phones, typically for use by pay-as-you-go customers, like the Samsung SPH-M300.

      Features

      REX is a Real-time operating system with the following features:

      • Preemptive multitasking
      • Task management
      • Task synchronization
      • Exclusive lock
      • Timer
      • Interrupt management
      • Uses less than 5K of ROM[1]

      REX does not provide any memory protection features but does have memory management capabilities.

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      References

      1. ^ a b c Staff. "REX and Common Software". Retrieved 2012-03-10. 
      2. ^ Keonwoo Kim, Dowon Hong, Kyoil Chung, and Jae-Cheol Ryou. "Data Acquisition from Cell Phone using Logical Approach". Retrieved 2012-03-10. 
      3. ^ Edgewall Software. "HTC Vision". Retrieved 2012-03-12. 
      4. ^ Saad Zaman Asif. Next Generation Mobile Communications Ecosystem: Technology Management for Mobile Communications. John Wiley and Sons, 2011-01-11, p. 299. 
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      Last modified on 15 June 2013, at 11:56