REX OS
| 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 |
| Official website | {{ |
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.
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
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