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# Magenta and LK
LK is a Kernel designed for small systems typically used in embedded
applications. It is a good alternative to commercial offerings like
[FreeRTOS]( or [ThreadX](
Such systems often have a very limited amount of ram, a fixed set of peripherals
and a bounded set of tasks.
On the other hand, Magenta targets modern phones and modern personal computers
with fast processors, non-trivial amounts of ram with arbitrary peripherals
doing open ended computation.
Magenta inner constructs are based on [LK]( but
the layers above are new. For example, Magenta has the concept of a process but LK
does not. However, a Magenta process is made of by LK-level constructs such as
threads and memory.
More specifically, some the visible differences are:
+ Magenta has first class user-mode support. LK does not.
+ Magenta is an object-handle system. LK does not have either concept.
+ Magenta has a capability-based security model. In LK all code is trusted.
Over time, even the low level constructs will change to accomodate the new
requirements and to be a better fit with the rest of the system.