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This patch adds code to initialize the Global Descriptor Table. For simplicity, the memory is organized following the flat model. Thus, memory appears to Contiki as a single, continuous address space. Code, data, and stack are all contained in this address space (so called linear address space). The macros to manipulate bits from segment descriptor and the set_descriptor() helper are based on the ones described in [1]. [1] http://wiki.osdev.org/GDT_Tutorial
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: