REX OS

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REX Operating System
Company / developer Qualcomm
OS family Embedded operating system
Initial release 1999 [1]
Marketing target Smartphones
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[edit]

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.

References[edit]

  1. ^ a b 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. 

External links[edit]